Product guide

51
Humidity and Dew-Point Instruments
Please note: Michell Instruments adopts a continuous development program which sometimes
necessitates specifi cation changes without notice. Please contact us for latest version.
www.michell.com
Precision Manufacturing
DT284
Digital Relative Humidity and Temperature Transmitter - Duct Mount
The DT284 relative humidity transmitter uses the Hygrosmart
module, integrated in the interchangeable probe. This device
can be used in high-temperature applications due to the
remote placing of the measurement element and its small
overall size.
Highlights
• 12mm (0.47”) probe diameter
• Analog and digital output standard
• Interchangeable probe
• Analog output signals selectable through software
• Metric or US measurement units selectable through
software
• Can withstand temperatures up to 140°C (284°F)
Accessories and Spare Parts
SS probe 250mm (9.84"), SS cover & mesh fi lter USTE003
SS probe 500mm (19.69"), SS cover & mesh fi lter USTE010
SS probe 250mm (9.84"), SS cover & sinter fi lter USTE011
SS probe 500mm (19.69"), SS cover & sinter fi lter USTE012
PEEK probe 250mm (9.84") & cover, SS mesh fi lter USTE013
PEEK probe 500mm (19.69") & cover, SS mesh fi lter USTE014
RS422/485 to PC (RS232) converter 330185
USB cable/software for confi guration F035263
Al mounting fl ange for ø12mm (0.47") SS probes FLA012
SS sintered fi lter H3
SS sintered fi lter with tefl on coating J3
SS mesh fi lter K8
PEEK protection cap with SS mesh fi lter K9
You can check your hygrometer with the Control Kit HKC
which is based on the principle of non-saturated salt solutions.
Refer to technical data sheet CONTROL KIT
HKC
Technical Specifi cations
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 (±0.72°F)
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 V AC / 18 - 38 V DC
Load resistance Current output: R  500 
Power consumption 1.7 W
Operating conditions
Operating temperature
Probe
Housing
Storage
-30 to +140°C (-22 to +284°F)
-30 to +70°C (-22 to +158°F)
-40 to +70°C (-40 to +158°F)
Mechanical specifi cation
Ingress protection IP67
Material
Housing
Probe
Aluminum die casting
Stainless steel
Dimensions
Housing
Probe
120 x 120 x 49.5mm
(4.72 x 4.72 x 1.94”)
L=250/500mm ø12mm
(L=9.84/19.68” ø0.47”)
Weight 450g (15.87oz)
Electrical connections Screw terminals
INTERCHANGEABLE
PROBE
HYGROSMART ®
Dimensions
Issue No: DT284_97190_V2_UK_1110