Humidity and Dew-Point Instruments Relative Humidity Measurement and Calibration The widest range of humidity products from a pioneer of RH sensor development www.michell.
Humidity and Dew-Point Instruments Product Ranges Michell’s instruments have been successfully applied in the following markets: Dew-Point Transmitters Michell offers the widest range of dew-point sensors and transmitters on the market. From the industry standard Easidew 2-wire transmitter to the new, rugged Easidew PRO I.S. for hazardous areas, all are supplied with sensors traceable to national standards.
Humidity and Dew-Point Instruments Accreditations UKAS At Michell Instruments we understand and endorse the need to conform to recognized standards for quality and calibration. Our calibration laboratory maintains full traceability to British (NPL) and American (NIST) Humidity Standards.
Humidity and Dew-Point Instruments Michell Instruments Global Leader for Solutions in Moisture, Humidity and Gas Analysis Service and Support Established in 1974, the Michell Instruments Group of Companies brings more than 35 years of research, design and state-of-the-art technology to the world of moisture measurement and control.
Humidity and Dew-Point Instruments Contents Accreditations ..............................................................2 DT269 .........................................................................45 Digital Relative Humidity & Temperature Transmitter, Duct Mount Michell Instruments .....................................................3 DT722 .........................................................................47 Contents .......................................................................
Humidity and Dew-Point Instruments Product Guide Choosing the best product from this catalog Chemical tolerance When moisture levels need to be measured in a gas (or in air), changes in temperature, the composition of the gas and the humidity level will all influence the stability of the measurement. In some cases the gas needs to be analyzed prior to selection of the right product.
Humidity and Dew-Point Instruments Humidity Sensor Technology Easidew Advanced Ceramic Moisture Sensor Technology for direct trace moisture and dew-point measurements Relative Humidity Sensors Michell’s H5000 and H6000 Series are capacitive humidity sensors providing fast and accurate measurement of relative humidity in air, gases and other environments.
Humidity and Dew-Point Instruments Humidity Sensor Technology Michell’s relative humidity sensors were originally developed by the French company Coreci S.A. In 2008, the Michell Group acquired the technology and the dedicated team of sensor engineers in Lyon, France that have developed the product line and achieved an enviable, world-wide reputation for sensor quality and performance.
Humidity and Dew-Point Instruments Humidity Sensor Technology Calibration of in-service hygrometers should be verified on a 6 to 12 months schedule. Under normal operating conditions, accuracy is excellent, and an adjustment is normally not necessary. Saturated salt and unsaturated salt RH reference elements are available for calibration procedures, as well as more sophisticated automatic calibrators such as the S503, S904 and OptiCal.
Humidity and Dew-Point Instruments Environmental Control PCMini52 Digital Relative Humidity and Temperature Mini Probe w/Analog Output Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity <±2% RH (10–90% RH) Accuracy at 23°C (73°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Cable Brown Supply voltage V + White Output RH, Dew Point or Absolute Humidity Black Output temperature Blue Common ground Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a string: {Feature A}+{Feature B}+{Feature C}+{Feature D}+{Feature E}+{Feature F}+{Feature G} Order example: PCMINI52+4+XX+H+T1+CA+F03 Relativ
Humidity and Dew-Point Instruments Environmental Control PCMini70 Relative Humidity and Temperature Mini Probe Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +85°C (-22 to +185°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Cable Green Pt100 White White Black 0V Red +5 V - Common ground - Supply Voltage V+ Violet Out V - Output RH (Volt) Yellow Out F - Output RH (freq) Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a string: {Feature A}+{Feature B}+{Feature C} Order example: PCMINI70+1+K1 Relative humidity and temperature mini
Humidity and Dew-Point Instruments HVAC / Environmental Control PC33 & 52 Analog Relative Humidity and Temperature Probe Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity PC52: <±2% RH (10–90% RH) PC33: <±3% RH (30–80% RH) Accuracy at 23°C (73°F) Temperature PC52: ±0.2°C (±0.36°F) PC33: ±0.3°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Voltage output Cable Connector White Pin 1 Green Pin 4 Yellow Brown 4-20 mA output 2-wire Cable Connector Power Supply V + White Pin 1 Output RH + Brown Pin 3 Output RH - Pin 2 Output temperature + Green Pin 4 Output temperature + Pin 3 Common ground Yellow Pin 2 Output temperature - Output RH + Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, whic
Humidity and Dew-Point Instruments Environmental Control / Precision Manufacturing PC62 & 62V Digital Relative Humidity & Temperature Probe with Digital or Analog Output Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity <±2% RH (10–90% RH) Accuracy at 23°C (73°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Voltage output Cable Connector Cable Connector RS232 White Pin 1 Green Pin 4 Yellow Brown RS485 Power Supply V + White Pin 1 Power supply V + Power Supply V + Output RH + Green Pin 4 TX TX/RX + Pin 2 Output temperature + Yellow Pin 2 RX RX/TX - Pin 3 Common ground Brown Pin 3 Ground Ground Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and th
Humidity and Dew-Point Instruments Meteorological PFMini72 Relative Humidity and Temperature Probe Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections 4 wire cable 6 wire cable White Output RH + White Output RH + Black Common ground Black Common ground Power supply V+ Red Power supply V+ Red Blue Output temperature + Blue Pt100 Yellow Green Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a string: {Feature A}+{Feature B}+{Feature C}+{Feature D}+{Featur
Humidity and Dew-Point Instruments HVAC Relative Humidity Probe Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +70°C (-22 to +158°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections PF 211-A: 4-20 mA output 2-wire PF 211-B: V output (0-10 V) Cable Connector Cable Connector Red Output RH + Red Power supply V + Blue Output RH - Black Common ground Blue Output RH + White Pt100 White Yellow Pt100 Green Yellow Green Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a string: {Feature
Humidity and Dew-Point Instruments Precision Manufacturing SF52 Dew-Point Transmitter Technical Specifications Performance Measurement range (dew point) -40 to +60°C (-40 to +140°F), dew-point temperature Measurement range (absolute humidity) 0 to 200 g/m3 (0 to 87.4 gr/ft3) Accuracy (dew point) ±2°C (±3.6°F) dew point Accuracy (absolute humidity) 0.4 to 3 g/m3 (0.175 to 1.311 gr/ft3) on value of absolute humidity Stability <1°C / year (<1.
Humidity and Dew-Point Instruments Electrical Connections Cable Voltage output/mA output White Power supply V+ Green Output Td+ Brown Common ground load max 500 Ω Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a string: {Feature A}+{Feature B}+{Feature C}+{Feature D}+{Feature E} Order example: SF52+4+X+T1+N Dew-point transmitter SF52, 0-5 V output, Td ºC/ºF dp signal
Humidity and Dew-Point Instruments Precision Manufacturing Easidew Transmitter 2-Wire Dew-Point Transmitter Technical Specifications Performance Measurement range (dp) -100 to +20°C (-148 to +68°F) dew point Accuracy (dp) ±2°C (±3.6°F) dew point Response time 5 mins to T95 (dry to wet) Repeatability 0.5°C (0.
Humidity and Dew-Point Instruments Electrical Connections Accessories and Spare Parts 4-20 mA connections 2-wire Pack of 10 replacement HDPE guards EA2-HDPE SS sintered guard replacement SSG Pin 1 4-20 mA Easidew communications kit for EA2 EA2-CK Pin 3 POWER SS sample block (5/8" UNF thread with 1/8" NPT ports) CSB 3/4”-16 UNF to 5/8” UNF male adapter, SS (Panametrics thread) APT-PAN G 1/2" to 5/8" UNF male adapter, SS (E&H or GEI thread) APT-GEI 1/2" BSP to 5/8" UNF thread adapter APT-
Humidity and Dew-Point Instruments Precision Manufacturing Easidew TX I.S. ATEX, FM/CSA Certified Dew-Point Transmitter Technical Specifications Performance Measurement range (dp) -100 to +20°C (-148 to +68°F) dew point Accuracy (dp) ±2°C (±3.6°F) dew point Response time 5 mins to T95 (dry to wet) Repeatability 0.5°C (0.
Humidity and Dew-Point Instruments Accessories and Spare Parts Electrical Connections Pack of 10 replacement HDPE guards EA2-HDPE SS sintered guard replacement SSG Pin 1 4-20 mA 4-20 mA connections 2-wire Easidew communications kit for EA2 EA2-CK Pin 3 POWER SS sample block (5/8" UNF thread with 1/8" NPT ports) CSB 3/4”-16 UNF to 5/8” UNF male adapter, SS (Panametrics thread) APT-PAN G 1/2" to 5/8" UNF male adapter, SS (E&H or GEI thread) APT-GEI 1/2" BSP to 5/8" UNF thread adapter APT-
Humidity and Dew-Point Instruments Precision Manufacturing Easidew PRO I.S. Intrinsically Safe Dew-Point Transmitter Technical Specifications Performance Measurement range (dp) -100 to +20°C (-148 to +68°F) dew point Accuracy (dp) ±1°C (±1.8°F) dp (+20 to -60°C (+68 to -76°F)) ±2°C (±3.6°F) dp (-60 to -100°C (-76 to -148°F)) Response time 5 mins to T95 (dry to wet) Repeatability 0.5°C (0.
Humidity and Dew-Point Instruments 4-20 mA connections 2-wire POWER Pin 4 4-20 mA Dimensions PP P P Accessories and Spare Parts EPR-BRK 0 PP ( PP Cable entry adapter M20 to 1/2" NPT, brass CEA-M20-NPT-B Cable entry adapter M20 to 1/2" NPT, SS CEA-M20-NPT-SS 0 [ PP 7+58 Cable entry adapter M20 to 1/2" BSP, brass CEA-M20-BSP-B Cable entry adapter M20 to 1/2" BSP, SS CEA-M20-BSP-SS Hazardous area cable gland, brass ø3-8mm cable CG-M20-B
Humidity and Dew-Point Instruments Precision Manufacturing Easidew Online Dew-Point Hygrometer Technical Specifications Performance Measurement range -100 to +20°C (-148 to +68°F) dew point 0–3000 ppmv ppmv output or non-standard dew-point range must be specified at time of order Accuracy (dp) ±2°C (±3.6°F) dew point Response time 5 mins to T95 (dry to wet) Repeatability 0.5°C (0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 To sensor Blue cable 13 Output mA - 3 To sensor Green cable 14 Output mA + 4 To sensor Red cable 16 Alarm relay contact 7 Alarm relay contact 2 - N/O 17 Alarm relay contact 8 Alarm relay contact 2 - N/C 23 Power supply N 9 Alarm relay contact 2 - com 24 Power supply L Accessories and Spare Parts Pack of 10 replacement HDPE guards EA2-HDPE SS sintered guard replacement SSG Easidew communications kit for EA2 EA
Humidity and Dew-Point Instruments Calibration MDM25 Hand-Held Hygrometer Technical Specifications: Hand Meter Performance Measurement units %RH, °C/°F Ta, °C/°F Td, g/m3, °C/°F Tw Mechanical specification Ingress protection IP54 - Hand meter only Handmeter housing material Molded polymer housing ABS + rubber surround Weight 300g (10.58oz) Display resolution Graphic LCD 128 x 64 pixels Electrical output/input Supply voltage 4.
Humidity and Dew-Point Instruments Dimensions FPR SPR HTPR300 HTPR500 SWPR Ø12mm (0.5”) 161mm (6.3”) 233.2mm (9.2”) 53.4mm (2.1”) 10° 82mm (3.
Humidity and Dew-Point Instruments Precision Manufacturing MDM300 Advanced Dew-Point Hygrometer Technical Specifications Performance The MDM300 High-Speed Dew-Point Hygrometer offers rapid spot check measurements of dew-point or moisture content, in a compact instrument packed with features and intelligent engineering. Measurement technology Michell ceramic sensor Accuracy ± 1°C from -60 to +20°C (-76 to +68°F) dp ± 2°C from -100 to -60°C (-148 to -76°F) dp ± 0.2°C (0.
Humidity and Dew-Point Instruments Accessories and Spare Parts Carry bag – for standard and I.S. instruments Swagelok gas fittings – various sizes available Cable for external dew-point sensor – various lengths available External temperature sensor – various cable lengths available External pressure sensor – various cable lengths available External dew-point sensor for standard instrument – versions for standard and I.
Humidity and Dew-Point Instruments HVAC RM33 & 52 Relative Humidity and Temperature Transmitter, HVAC Room Monitor Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) 0 to +50°C (+32 to +122°F) Accuracy at 23°C (73°F) Humidity RM52: <±2% RH (10–90% RH) RM33: <±3% RH (30–80% RH) Accuracy at 23°C (73°F) Temperature RM52: ±0.2°C (±0.36°F) RM33: ±0.3°C (±0.54°F) Temperature influence ±0.05% RH/°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Voltage output mA output Pin 1 Pin 1 Pin 1 Output RH + Pin 1 Output RH + Pin 2 Pin 2 Pin 2 Output RH - Pin 2 Output RH - Pin 3 Pin 4 Pin 3 Pin 3 Output temperature + Temperature sensor Pt100/Pt1000 Pin 3 Pin 4 Pin 5 Output RH + Pin 4 Pin 6 Common ground Pin 5 Output RH + Pin 6 Pin 5 Pin 7 Power supply V+ Pin 6 Common ground Pin 7 Pin 6 Pin 7 Power supply V+ Pin 8 Pin 8 Pin 5 Temperature sensor Pin 4 Pin 7 P
Humidity and Dew-Point Instruments HVAC / Environmental Control WM33 & 52 Relative Humidity and Temperature Transmitter, Wall Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity WM52: <±2% RH (10–90% RH) WM33: <±3% RH (30–80% RH) Accuracy at 23°C (73°F) Temperature WM52: ±0.2°C (±0.36°F) WM33: ±0.3°C (±0.
Humidity and Dew-Point Instruments Electrical Connections 3/4 wire V DC power supply voltage output 2 wire V DC power supply mA output Pin 1 Pin 1 Pt100/Pt1000 Pt100/Pt1000 Pin 2 Pin 2 Pin 2 Output temperature + Pin 1 Output temperature - Pin 3 Common ground Pin 2 Output temperature + Pin 4 Output RH + Pin 3 Output RH + Pin 5 Power supply V + Pin 4 Output RH - 3/4 wire with display Pin 1 Output temperature + Pin 2 Common ground Pin 3 Output RH , Dew Point, Absolute Humidity + P
Humidity and Dew-Point Instruments Environmental Control WM261 Digital Relative Humidity & Temperature Transmitter, Wall Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature Pt100 1/3DIN direct ±0.2°C (±0.36°F) Current output ±0.3°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Version mA output and Pt100 direct Version mA output for RH and Temperature Version V output and Pt100 direct Version V output for RH and Temperature Pin 1 Output RH + Pin 1 Output temperature + Pin 1 Power supply V + Pin 1 Power supply V + Pin 2 Output RH - Pin 2 Output Temperature - Pin 2 Common ground Pin 2 Common ground Pin 3 Pin 3 Output RH + Pin 3 Output RH + Pin 4 Pin 4 Output RH - Pin 4 Pt100 direct Pin 5 Warni
Humidity and Dew-Point Instruments Precision Manufacturing WM281 Digital Relative Humidity & Temperature Transmitter, Wall Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +70°C (-22 to +158°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5-95% RH) Accuracy at 23°C (73°F) Temperature ±0.4°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Output Channel 1 Temperature + 12 Not connected 6 Output Channel 1 Ground 13 Output Channel 3 (not connected) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (not connected) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, sel
Humidity and Dew-Point Instruments Precision Manufacturing WM291 Digital Relative Humidity & Temperature Transmitter, Wall Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +70°C (-22 to +158°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5-95% RH) Accuracy at 23°C (73°F) Temperature ±0.4°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Output Channel 1 Temperature + 12 Not connected 6 Output Channel 1 Ground 13 Output Channel 3 (optional) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (optional) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, select the re
Humidity and Dew-Point Instruments Digital Relative Humidity & Temperature Transmitter, Duct Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -20 to +80°C (-4 to +176°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature Pt100 1/3 DIN direct ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Version mA output and Pt100 direct Version mA output for RH and Temperature Version V output and Pt100 direct Version V output for RH and Temperature Pin 1 Output RH + Pin 1 Output temperature + Pin 1 Power supply V + Pin 1 Power supply V + Pin 2 Output RH - Pin 2 Output Temperature - Pin 2 Common ground Pin 2 Common ground Pin 3 Pin 3 Output RH + Pin 3 Output RH + Pin 4 Pin 4 Output RH - Pin 4 Pt100 direct Pin 5 Warni
Humidity and Dew-Point Instruments Precision Manufacturing DT722 Rugged Industrial Relative Humidity and Temperature Transmitter, Duct Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -40 to +150°C (-40 to +302°F) Accuracy at 25°C (77°F) Humidity <±2% RH (5-95% RH) Accuracy at 25°C (77°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Connections Cable Pin White Pin 1 Output RH + Brown Pin 3 Output RH - Green Pin 4 Output T + Yellow Pin 2 Output T - Connect RH + with T + by user Ordering Codes To construct the order code, select the relevant feature from the tables below, starting with the base model, which is {Feature A} and then add on options to create a string: {Feature A}+{Feature B}+{Feature C}+{Feature D}+{Feature E}+{Feature F}+{Feature G} Order example: DT
Humidity and Dew-Point Instruments Precision Manufacturing DT282 Digital Relative Humidity and Temperature Transmitter - Duct Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +70°C (-22 to +158°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.4°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Output Channel 1 Temperature + 12 Not connected 6 Output Channel 1 Ground 13 Output Channel 3 (not connected) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (not connected) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, sel
Humidity and Dew-Point Instruments Precision Manufacturing DT284 Digital Relative Humidity and Temperature Transmitter - Duct Mount Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +140°C (-22 to +284°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.4°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Output Channel 1 Temperature + 12 Not connected 6 Output Channel 1 Ground 13 Output Channel 3 (not connected) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (not connected) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, sel
Humidity and Dew-Point Instruments Precision Manufacturing WR283 Digital Relative Humidity and Temperature Transmitter - Remote Probe for High Temperatures Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +200°C (-22 to +392°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.4°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Output Channel 1 Temperature + 12 Not connected 6 Output Channel 1 Ground 13 Output Channel 3 (not connected) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (not connected) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, sel
Humidity and Dew-Point Instruments Precision Manufacturing WR285 Digital Relative Humidity Transmitter - Remote Probe for Pressurized Applications up to 30 bar (400 psi) Technical Specifications Performance Measurement range (RH) 0–100% RH Accuracy at 25°C (77°F) Humidity <±2% RH (5–95% RH) Stability – RH Sensor ±1% RH/year Response time – RH Sensor <10 sec typical (for 90% of the step change) Electrical output/input Output signal 0–1, 0–5, 0–10 V 0–20 mA, 4–20 mA, RS485 Supply voltage 15 - 27
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Not connected 12 Not connected 6 Not connected 13 Output Channel 3 (not connected) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (not connected) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, select the relevant feature fr
Humidity and Dew-Point Instruments Precision Manufacturing WR293 Digital Relative Humidity and Temperature Transmitter - Remote Probe for High Temperatures Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +200°C (-22 to +392°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.4°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Pin 1 Power Supply V + 8 Output Channel 2 Ground 2 Power Supply V - 9 RS485 Data + 3 Output RS485 Ground 10 RS485 Data - 4 Ground 11 Not connected 5 Output Channel 1 Temperature + 12 Not connected 6 Output Channel 1 Ground 13 Output Channel 3 (optional) 7 Output Channel 2 RH + 14 Output Channel 3 Ground (optional) Do not connect pin 2 (V -) to pin 4 (Ground) Ordering Codes To construct the order code, select the re
Humidity and Dew-Point Instruments Capacitive Relative Humidity Sensor Technical Specifications Response time 90% of scale for a step change from 11% to 75% RH Operating range Humidity Temperature Pressure Mixing ratio The operating principle of these capacitive relative humidity sensors are based on the hygroscopic properties of their polymer, which is used like a dielectric in a capacitor.
Humidity and Dew-Point Instruments Sensors H6000 & 6100 Capacitive Relative Humidity Sensor Technical Specifications Response time 90% of scale for a step change from 11 to 75% RH Operating range Humidity Temperature Pressure Mixing ratio • Teflon coated • Capacitive thin film sensor • Measuring range: 0–100% RH, Temp: -30 to +200°C (-22 to +365°F) • Mixing ratio: 250g (8.82oz) water/kg of dry air • Low hysteresis • Response time: 20 seconds 0–100% RH -30 to +100°C (-22 to +212°F) 0.
Humidity and Dew-Point Instruments Sensors I7000 & 7400 (Hygrosmart) Interchangeable Module for Relative Humidity Technical Specifications Performance Measurement range (RH) 0–100% RH Measurement range (T) -30 to +85°C (-22 to +185°F) Accuracy at 23°C (73°F) Humidity <±2% RH (5–95% RH) Accuracy at 23°C (73°F) Temperature ±0.2°C (±0.
Humidity and Dew-Point Instruments Electrical Connections Pin Digital output 1 Output frequency Characterized by a variable frequency pulse train in function of the relative humidity. 2 Common Ground 3 Power Supply V + (5 V DC) 4 Output RH + 0-1 V DC (I7000) (Output 0.2-1 V DC (I7400) 5
Humidity and Dew-Point Instruments Calibration S503 Relative Humidity Generator for Calibrations Technical Specifications Humidity Generation range 10–90% RH in steps of 0.1% RH Accuracy ±2% RH or better (5–95% RH) Stability chamber Better than ±0.5% Stabilization time to set point <10 minutes Temperature Temperature accuracy ±0.3°C (±0.
Humidity and Dew-Point Instruments 0.25kg (0.55lbs) desiccant (orange) A000171 ø18.5mm (0.73") molded polymer port adpt (for ø8mm (0.31") probes) A000180 ø18.5mm (0.73") molded polymer port adpt (for ø12mm (0.47") probes) A000190 ø18.5mm (0.73") blind stop A000200 Carrying case for the S503 A000230 Water bottle A000242 Tool for changing the port adapters A000265 SS port adapter for Optidew A000272 Polymer port adpt ø18.5mm (0.73") to ø3mm (0.
Humidity and Dew-Point Instruments Calibration Optidew Vision Precision Dew-Point Meter Technical Specifications Performance Measurement range at sensor temp of 20°C: 1-stage 2-stage High temperature -30 to +90°Cdp (-22 to +194°Fdp) -40 to +90°Cdp (-40 to +194°Fdp) -20 to +130°Cdp (-4 to +266°Fdp) Measurement accuracy ±0.2°Cdp ±0.1°C temperature ±0.
Humidity and Dew-Point Instruments Accessories and Spare Parts High accuracy calibration to ±0.15°Cdp (not available with HT sensor) OPV-ACC Sintered SS guard for particulate contamination 10-12 μm OPV-SSG HDPE sintered guard for particulate and liquid protection 10 μm OPV-HSG Membrane sensor guard for protection from liquid contamination >0.2 μm OPV-MSG Membrane element, to replace membrane sensor guard (pack 1) >0.
Humidity and Dew-Point Instruments Calibration S904 Relative Humidity and Temperature Generator for Calibrations Technical Specifications Humidity Generator range 10-90% RH Accuracy Control element ≤±1% RH (10–70% RH) ≤±1.5% RH (70–90% RH) Stability ±0.2% RH (20–80% RH) Temperature Generator range +10 to +50°C (+50 to +122°F) (lowest T set point = 10ºC (18°F) below ambient) Accuracy ±0.1°C (±0.2°F) Stability ±0.1°C (±0.
Humidity and Dew-Point Instruments Accessories and Spare Parts 0.25kg (0.55lbs) desiccant (orange) A000171 ø18.5mm (0.73") Blind stop A000200 Drying module A000240 Water bottle A000242 Door kit with 5 ports. 5 adapters to be specified A000263 Door kit with 5 ports and 25 adapters (5 x ø19mm (0.75"), 4 x ø12mm (0.47"), ø13.5mm (0.53"), ø15mm (0.59"), ø18.5mm (0.73"), ø24mm (0.94") - and blind stops.
Humidity and Dew-Point Instruments Calibration OptiCal Relative Humidity and Temperature Generator with built-in Chilled Mirror Reference Technical Specifications Reference Hygrometer Type Optidew chilled mirror dew-point transmitter Humidity Generator range 10–90% RH Accuracy Control element ≤±1% RH (10–70% RH) ≤±1.5% RH (70–90% RH) Stability ±0.2% RH (20–80% RH) Temperature Generator range +10 to +50°C (+50 to +122°F) (lowest T set point = 10ºC (18°F) below ambient) Accuracy ±0.1°C (±0.
Humidity and Dew-Point Instruments Accessories and Spare Parts Dimensions 0.25kg (0.55lbs) desiccant (orange) A000171 ø18.5mm (0.73") Blind stop A000200 Drying module A000240 Water bottle A000242 PRT sensor A000243 Door kit with 5 ports. 5 adapters to be specified A000263 Door kit with 5 ports and 25 adapters (5 x ø19mm (0.75"), 4 x ø12mm (0.47"), ø13.5mm (0.53"), ø15mm (0.59"), ø18.5mm (0.73"), ø24mm (0.94") - and blind stops.
Humidity and Dew-Point Instruments Calibration Control Kit For the Calibration of Relative Humidity Sensors Technical Specifications The control kit consists of: • 5 phials of the same humidity value • 7 test strips • 1 control chamber with version HKCxxC, without control chamber with version HKCxxS • Box dimensions: 100 x 140 x 40mm (3.93 x 5.51 x 1.57”) • Weight: 0.15kg (0.33lb) Accuracy An accuracy of ±3% RH can be achieved if the test procedure is adhered to.
Humidity and Dew-Point Instruments Effects of pressure, temperature and concentration on humidity parameters In nature, water exists in three different states: gaseous (vapor), liquid (rain, fog) and solid (snow, ice, hail). Water in the gaseous state is invisible. The maximum quantity of water vapor that the air can contain depends on temperature and pressure. The table below shows how the parameter change influences the measured values.
Humidity and Dew-Point Instruments Accessories Item Associated products Item Associated products A000001 19mm (0.75”) Slotted protection cap white WM33 & 52 A000022 12mm (0.47”) Mesh filter with protection cap, black PCMini52, MDM25 A000002 19mm (0.75”) Slotted protection cap black PC33, 52, 62 & 62V DT722, MDM25 A000023 12mm (0.47”) Flat SS sintered dust filter PCMini52, MDM25 A000003 12mm (0.47”) Slotted protection cap, black PCMini52, MDM25 A000025 19mm (0.
Humidity and Dew-Point Instruments Accessories Item Associated products Item Associated products A000045 19mm (0.75”) Foil filter 1.5μm with protection cap white WM33 & 52 K9 PEEK protection cap with SS mesh filter WR283 WR293 DT284 H2 SS sintered filter WM281 WM291 DT282 SSG SS sintered guard replacement Easidew Easidew I.S. Easidew PRO I.S.
Humidity and Dew-Point Instruments Accessories Item Associated products A000030 19mm (0.75”) Connector, no cable, with screw terminals PC33, 52, 62 & 62V DT722 A000030XM 19mm (0.75”) Connector, with cable (customer spec length) PC33, 52, 62 & 62V DT722 A000031 19mm (0.75”) Connector with 2m (6.5’) cable PC33, 52, 62 & 62V DT722 A000032 19mm (0.75”) Connector with 5m (16’) cable PC33, 52, 62 & 62V DT722 A000033 12mm (0.47”) Connector with 2m (6.5’) cable PCMini52 A000036 12mm (0.
Humidity and Dew-Point Instruments Accessories Item Associated products Item Associated products A000100 3/4” NPT SS adj. fitting for SS probes PC33, 52, 62 & 62V DT722 1A01210 Mini flange I7000 I7400 A000101 1/2” NPT SS adj fitting for SS probe. Only to be used with SS probe housing PCMini52 2510367 Mounting clip PFMini72 A000110 Al mounting flange for ø19mm (0.75”) SS probes (outside ø80mm (3.
Humidity and Dew-Point Instruments Accessories Item Associated products EA2-CK Easidew communications kit for Easidew and Pura 2-wire transmitters. Enables connection to PC or laptop; re-ranging and reconfiguration of output via configuration software Easidew TX Easidew TX I.S. Easidew PRO I.S. Easidew PRO Liquids I.S. Pura Transmitter Pura Transmitter I.S.
Humidity and Dew-Point Instruments Accessories Item Associated products A000350 Sample block without filter SF52 A000351 Sample block with filter SF52 EA2-SAM Easidew Sampler SS block w/filter cartridge (0.3μm), inlet/outlet push ftgs, m-valve & PTFE vent tube (6mm (0.24”)), mtg bracket Easidew Easidew I.S. Easidew PRO I.S. Easidew Online CSB SS sample block (5/8” UNF thread with 1/8” NPT ports) Easidew Easidew I.S. Easidew PRO I.S.
Humidity and Dew-Point Instruments Accessories Item Associated products Item Associated products A000180 ø18.5mm (0.73”) molded polymer port adpt (for ø8mm (0.31”) probes) S503 A000273 Polymer port adpt ø18.5mm (0.73”) to ø3mm (0.19”) (for Optidew probe) S904 S503 OptiCal A000200 Blind stop ø18.5mm (ø0.73”) S904 OptiCal A000277 Blind stop for Optidew adapter S503 S904 A000263 Door kit with 5 ports.
Humidity and Dew-Point Instruments Accessories Item Associated products Item Associated products A000284 Al port adpt for ø15mm (0.59”) probe, blind stop (M30x1) S503 A000292 Polymer port adpt for ø13.5mm (0.53”) probe, blind stop (M30x1) S904 OptiCal A000285 Al port adpt for ø18.5mm (0.73”) probe, blind stop (M30x1) S503 A000293 Polymer port adpt for ø14mm (0.55”) probe, blind stop (M30x1) S904 OptiCal A000286 Al port adpt for ø19mm (0.
Humidity and Dew-Point Instruments Accessories Item Associated products Item Associated products A000171 0.25 kg (0.
Humidity and Dew-Point Instruments Applications for Humidity Sensors Michell humidity sensors are used in hundreds of applications, including: Agriculture • Agricultural and Crop Research • Agrochemical • Environmental Testing • Poultry/Meat/Egg/Dairy • Greenhouses Aerospace • MIL Spec Welding • Cabin Environment • Environmental Testing • Coatings • Parts Storage • Space Purge Systems • Weather Monitoring Automotive • HVAC Manufacturing • Dynamometer/Engine Test Cells • Paint Booths • In-Vehicle Air Quali
Humidity and Dew-Point Instruments Applications Leather/Textile • Dyeing/Printing • Process Control • Product Quality • Storage & Transportation • Maintenance Alarms Marine • Inert Gas Systems • Lubrication Oil Monitoring • Weather Observation • Maintenance Alarms Metallurgy • Furnace Gas • Lubrication and Quench Oil • Dry Air Storage • Sintering Furnace • Maintenance Alarms • Environmental Testing Meteorology • Professional Forecasting • Agricultural and Forest • Emergency Management • Fire Hazard Warning
Humidity and Dew-Point Instruments Applications Power/Energy • Dew Point in SF6 • Compressed Air • Gas Turbine Inlet Air • Lubrication Oil • H2 Cooling Loop • Bag Houses • Transformer Maintenance • Maintenance Alarms Process • Monitor Environments • Adhesives • Prevent Corrosion • Prevent Contamination • Preserve Texture • Conserve Energy • Environmental Testing Rubber • Natural Rubber Storage • Tire Cord Storage • Maintenance Alarms Semi Conductor • Clean Rooms • Compressed Air • Environmental Compensatio
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity At any particular temperature, air that contains its full capacity of water vapour, is said to be ‘saturated’. The ‘relative humidity’ of the air expresses how fully saturated it is with water vapour. A variety of other (‘absolute’) measures are used to express how much water vapour is actually present (irrespective of temperature or level of saturation).
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity Probe – the part of an instrument that houses the sensor remotely from the main body of the instrument, e.g. at the end of a connecting electrical lead. In some situations the word ‘probe’ may be used to refer to an entire hygrometer. Also loosely used interchangeably with ‘sensor’ and ‘transmitter’. ‘Probe’ may also refer to a tube used to extract gas for measurement. Sensor – the active or sensing part of a measuring instrument.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity Expressed in terms of energy per quantity of dry gas, i.e. kilojoules per kilogram (kJ kg-1) (or other units, for example British thermal units per pound, Btu/lb). NOTE: When the mole is used, the elementary entities must be specified as atoms, molecules, etc. Mole fraction – The mole fraction of a component is the ratio of the amount (number of moles) of that component to the total amount of substance present.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity USAGE: The phrase ‘relative humidity’ is commonly abbreviated RH although this is not a recognized abbreviation. Values of relative humidity are commonly expressed in units of percent relative humidity (% RH). Temperature and condensation One common cause of error in humidity measurement is the occurrence of unwanted condensation. Condensation can occur at cold spots, which are below the dew point of the gas.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity Table 1. Effect of a temperature change of 1 °C at various levels of temperature and relative humidity. The change in the relative humidity levels is not symmetric. Relative humidity Temperature 10°C 20°C 30°C 40°C 50°C 60°C 10% RH ±0.7% RH ±0.6% RH ±0.6% RH ±0.6% RH ±0.5% RH ±0.5% RH 50% RH ±3.5% RH ±3.2% RH ±3.0% RH ±3.0% RH ±2.6% RH ±2.3% RH 90% RH ±6.3% RH ±5.7% RH ±5.7% RH ±5.4% RH ±4.6% RH ±4.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity If any gas is compressed or expanded without adding or removing components, then the mass of all components is unchanged. Therefore the mixing ratio is unaltered by the pressure change. This can also be deduced from the fact that the definition of mixing ratio does not involve pressure or temperature.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity 3.3 Instrument format and usage End use – Humidity itself may be of interest, or humidity may be used as an indication of the moisture content of other solid or liquid substances. If so, it may give no more than a very indirect indication of the actual content, though ERH and water activity are proper indications, in a different way, of the condition or equilibrium of materials with the environment.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity • • • • • • • • • • range resolution uncertainty (accuracy) repeatability reproducibility non-linearity hysteresis response time long-term stability temperature coefficient This list is not exhaustive, although it indicates the most important specifications to consider when selecting an instrument.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity The deviation from the ideal calibration line will have a maximum or minimum, usually expressed in the form: ‘Non-linearity ±0.5% RH’, at a given temperature. It should also be noted that linearity characteristics can be significantly affected by temperature.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity Any calibration corrections identified on a certificate of calibration should be applied to measured values obtained using that instrument. If the calibration corrections cannot be applied, the quoted uncertainty in the results should include an allowance for this. What is checking? A measurement check is not the same thing as a calibration.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity • Condensation in a sampling process can invalidate humidity measurements by reducing the water content of the gas being measured. What is more, condensed liquid may alter the humidity elsewhere by dripping or running to other locations and evaporating there. In these circumstances, measurement results may be misleading if hygrometer location is not considered carefully.
Humidity and Dew-Point Instruments A Guide to the Measurement of Humidity • Surface finish of pipework is important for very dry gases. Even the tiny quantities of water adsorbed on the surfaces of non-hygroscopic materials can have significant effect. Polished or electropolished steel is recommended for the best results. • Clean environments are always best for humidity measurements, but this is especially critical at very low humidity. Even fingerprints harbour water.
Humidity and Dew-Point Instruments Notes 97 www.michell.
Humidity and Dew-Point Instruments Notes © Michell Instruments 2009-2011 98
Humidity and Dew-Point Instruments Asia Michell Asia PO Box 3149 Joondalup WA 6027 Australia France Michell Instruments SAS 2-4, rue Jean Desparmet 69008 Lyon, France T: [33] 437 53 88 20 F: [33] 437 53 88 21 E: fr.info@michell.com T: [61] 893 046587 E: au.info@michell.
