Operating instructions Digital handheld pressure gauge HM35
Operating Instructions Contents Operating Elements .........................................................................................2 1 Description ............................................................................................3 2 Safety information .................................................................................3 3 Operation ..............................................................................................4 3.1 Switching on and off...................
Operating Elements Infra-red interface IR Connection for pneumatic tube Graphic display Zero position / Exit menu Function key Select operating mode Connection for 6 VDC power supply (not present in Ex-models) Hold display Start function Switch On/Off (> 1 s: Light on) Please note this warning symbol in these operating instructions! EC Declaration of Conformity We declare on our own responsibility that this product conforms to the following standards: • EN 61326-1/A1 Copyright © The contents of this pub
1 Description The HM35 digital pressure gauge is a pressure-measuring instrument with an integrated pressure sensor for the measurement of differential, relative or absolute pressures and vacuum. Its versatile range of functions and high precision render it suitable for a wide range of applications. Via the infrared interface (IR) and SCPI (Standard Commands for Programmable Instruments) commands, the HM35 can communicate with a PC.
3 Operation 3.1 Switching on and off Switching on Briefly press the On/Off key ( ) (< 1 s) For precise measurements, the HM35 must first be switched on for at least 1 minute (warm-up phase). Switching off Briefly press the On/Off key ( ) (< 1 s), or automatic switch-off 3, 10 or 60 minutes after the last time key operation (automatic switch-off does not take place during Average, Change Rate and Data Logging measurements or in IR and network operation).
3.2 Lighting Switching on Press the On/Off-key ( Brightness control In the Menu, select the Configuration → Lighting function and select an adjustment of Off, Level 1, Level 2 or Level 3. Switching off Briefly press the On/Off key ( ) (< 1 s) (switch off the instrument), or automatic switch-off after 20 s. With mains operation, the HM35 must be switched off manually. 3.3 ) for > 1 s Pneumatic connection Designation Pressure range Hose 4/6 mm ≤ 7,5 bar NPT1/8“ internal 10 ...
3.4 Functions and operating modes Key clear 1) hold Start 2) Functions PRESSURE DIFFERENCE ▲ MIN/MAX ▼ AVERAGE 4) CHANGE RATE 5) Zero: sets measured value to zero 3) Sets Max/Min to current measured value -Freezes all current measurement values To Menu selection Starts measuring Sets measured value to zero 3) Stop/Menu -- DATA LOGGING Starts data logging Notes 1) Once a measurement procedure has been started, the menu selection is blocked.
Key Notes Data logging Interval Interval period manual 25 M./s 10 M.
Key Notes Display Filter Filters the display values 1) 9 On Off Auto-Off Auto.
3.6 Data logging 3.6.1 Data recording Every time that the Data Logging is started, an information header ("Header") will first be saved: The measured values will then be saved sequentially. "Stop" will be saved after every interruption of the logging or if manual storage is carried out. At the end of all the data loggings, "End" will be saved. Measured values can be uniquely identified by their header. Designation Example 1 Date 01.01.
Notes 1) „Over“ (data type DISCRETE) for invalid pressure value 2) For the Data Type key, refer to the table on Page 18. 3) User-interval period will, for example, be displayed as follows, “user 01:15:00” 3.6.2 Transfer of data to a PC (with HM35 Communication Software) 1. 2. 3. 4. Install the IR (IrDA) -adapter according the instructions of the manufacturer. Install the HM35 Communication Software. Start the HM35 Communication Software. Place the instrument max.
Sending a command from PC to the instrument [SP ] [ , ] [ , ] [ , ...
Return Value Command processed: Return Value = o k Example for response: o k HT * 1 3 CR Error Return Value Meaning er-001 RS232 Protocol checksum Error er-110 Header Error; Too short Header Error; Too many subnodes Header Error; Query not at leaf node Header Error; Multiple querys Header Error; Characters after query Header Error; Too long er-113 Undefined Header; Undefined command er-109 Missing parameter Missing parameter; Boolean expected Missing parameter; String expected Missing parameter;
Initialisation Remarks ACT-220L/220L+ are programmed by toggling the control lines RTS and DTR. These lines may not be low at the same time during operation. In this condition the ACT220L/220L+ goes in power down mode. If DTR and RTS are low at the same time or in an undefined condition, both lines must be set high for at least 50 ms to leave the power down mode. 1 DTR 0 1 RTS 0 min.
Command Sub-node 1 MEASure UNITs SYSTem Transfer Parameters Parameter Data Type :PRESsure INTEGER :PRESsure? --- --- :TEMPerature? --- --- :PRESsure DISCRETE :PRESsure? --- --- :DATE ,,- INTEGER :DATE? --- --- :TIME ,, INTEGER :TIME? --- --- --- --- --- --- BOOLEAN :BATTery? --- --- :RANGe? --- --- :TOLerance? --- --- :IDENt? --- --- :FILTer BOOLEAN :ZERO --- --- :ERRor Sub-node 2 [:NEXT]?
Parameter limits Feedback data Feedback data type Description Remarks 0, 10, 25 FLOAT Continuous transfer of measured values Continuous measurement with 10 or 25 M/s. Stops with Interval=0 --- FLOAT Query measured pressure value Individual value --- FLOAT Query sensor temperature °C, individual value mbar, bar,.... atm --- --- Pressure unit input --- DISCRETE Query pressure unit E.g., mbar, bar,.... atm yyyy: 2001 ...2099 mm: 1...12 dd: 1...
Command Sub-node 1 Sub-node 2 Transfer parameter Parameter data type SYSTem :SET :AOFF
Feedback data type Description 3min, 10min, 60min --- --- Set auto Off time --- --- --- Switch off instrument ON, OFF --- --- Enable/disable auto zero 25M./s, 10M./s, 1s ... 24h --- --- Set interval time for Data Logging Similar to Menu 10s, 30s ... 24h --- --- Set time period for Average Similar to Menu OFF --- --- Set auto IrDA connection --- ,,... INTEGER Query the BIT-Error memory Variable amount of Feedback data, err: 0...
Data Type Key Designation Description Example INTEGER Decimal number, whole numbers only 123 FLOAT Floating-point number 123.45 I-FLOAT Floating-point number, transferred as an INTEGER. This means that it will not be transferred in the floating-point format, but as an INTEGER – value coded according to the IEEE754 standard. 3242721280 (corresponds to -12.
3.8 • Battery replacement Open the battery compartment and insert 3 x 1,5 V Mignon cell AA, IEC LR6. Always replace all three batteries at the same time! Ensure correct polarity! Dispose of used batteries in accordance with environmental regulations! 3.9 Calibration Re-calibration may only be carried out by specialist staff and with the corresponding pressure standards.
Notes • The calibration is always carried out in mbar. • The calibration must take place at a stable room temperature of 22 °C ± 2 °C. • A calibration value will only be accepted if it lies within ± 5 % of the full-scale value of the HM35. • With the pressure connections open, it is possible to only re-calibrate the zero point. • The date of the last calibration will be stored in the Calibration History. • In case of manual re-calibration, the previous measurement will become invalid.
Memory size Memory interval Average period Display Pneumatic connection Case dimensions Weight including batteries max.
4.2 Measuring Range and Precision The measured values display works in the range from -10 % to 110 % of the measurement range. Measuring rage Unit Pressure type 0 ... 10 0 ... 28 inH2O inH2O 1) d,g d,g 0 ... 80 inH2O 0 ... 120 inH2O 0 ... 200 0 ... 14.5 0 ... 15.9 Max. Loading Max. static pressure 0.0001 0.001 50 inH2O 140 inH2O 245 psi 245 psi d,g 0.001 600 inH2O 245 psi d,g 0.001 600 inH2O 245 psi inH2O d,g 0.001 1600 inH2O 245 psi psi psi d,g a 0.0001 0.
4.3 Measurement units The following units of measurement can be selected depending on the measuring range: Measurement ranges mba r bar Pa • hPa kPa MPa kg/ kg/ cm2 m2 1) 1) • • --• mm cm mm Hg Hg Hg 1) 2) 1) 2) 1) 2) • • -- 0 ... 10 inH2O • -- 0 ... 28 inH2O • -- • • • -- -- • • • -- 0 ... 80 inH2O • • • • • -- • • • • • 0 ... 120 inH2O • • • • • -- • • • • • 0 ... 200 inH2O • • • • • -- • • • • • 0 ... 14.5 0 ... 15.
4.4 Mains supply unit connection The unit can be operated from a regulated plug-in mains supply unit. Input Output 5 100 - 240 V, 50 - 60 Hz 6 VDC ± 10 %, 1,5 W Maintenance and storage The HM35 requires no maintenance. It can be cleaned with a damp cloth. Do not use cleaning agents containing solvents! See the relevant chapters for battery replacement und re-calibration. During longer storage, remove the batteries from the instrument.
7 Accessories Standard 3 x 1,5 V batteries IEC LR6 Operating instructions SCS Test certificate Options 6V mains supply unit 100 - 240 V, 50 - 60 Hz, 1,15 A Leather case with carrying strap Service-Set (transport case) Hand pump Infrared RS232 serial adapter NPT 1/8" adapter „Rectus“ adapter, type 20 Communication software for MS-Windows® (95/98, 2000, XP) 8 Summary of technical characteristics Characteristics HM35 Basic functions 1 pressure sensor installed Absolute pressure Differential pressure
Characteristics HM35 Remarks Low battery display Acoustic signal Self-test • • • For out-of-range / fault operation Housing Hand-held Splash proof IP54 • • Connections Tube 4/6 mm NPT1/8“ internal Plug-in nipple „Rectus“ Type 20 M10 x 1 internal thread Power supply socket • • • • • Display Graphic display Lighting Automatic contrast adjustment • • • Power supply Battery External plug-mounted power module • • Digital interfaces Infrared interface SCPI protocol • • Environmental conditions Ope
102 Indiana Highway 212 Michigan City, IN 46360 USA Phone ++1 219 879 8868 Fax ++1 219 872 9057 I-HM35/0208, Art. Nr. 70 792 155 LOVE CONTROLS Division Dwyer Instruments, Inc.
