Omega Engineering DP97 User Manual
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Omega Engineering DP97 User Manual

High accuracy digital thermometer
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  • Page 2: Table Of Contents

    Using RS232 interface for digital probe matching (corrections) 7. USE OF “CORRECTIONS PC SOFTWARE” Information in this publication may be subject to change; the DP97 is a microprocessor based, software driven instrument and may therefore be subject to software and hardware changes in line with our policy of continuous product development.

  • Page 3: Introduction

    1. INTRODUCTION A high precision portable thermometer for metrology and other exacting laboratory applications, the DP97 is a proven instrument used world wide as a laboratory and site standard in pharmaceuticals, medical, food, environmental testing, R & D, and general industrial applications.

  • Page 4: Front Panel Information At A Glance

    A-B (1) and select the required units (2). To set an A-B reading of zero to “null out” probe differences, press NULL (3). Error Indications: The DP97 has several modes of error indication according to internal or external problems. Refer to section 3,4 for details. Page 2...

  • Page 5: Installation

    Platinum Resistance Thermometer(s) (Pt100) must be fitted with a high quality D-plug and connected to INPUT A and/or INPUT B as required. A 3 OR 4 wire configuration can be used but they are connected differently as shown. The DP97 will automatically sense which configuration is employed.

  • Page 6: Operation

    3. OPERATION Ensure that the instrument is connected to a suitable supply or has charged batteries and that the required input connections are made. Switch “on” using the rear mounted rocker switch. The display will show “Pr 2.1” or “Pr 1.4” the programme designation. There is a short delay while internal checks are carried out, then the input A value will be displayed.

  • Page 7: Iv) Error Indications

    Matching DP97 to Calibrated Sensors It is possible to automatically match the DP97 to a Pt100 sensor with up to 10 dedicated calibration values. Such values, published in an associated certificate indicate true known reference temperatures. Up to 10 sets of values per sensor can be fed into the instrument via the RS232 interface using the associated software supplied with each version 2.1 instrument as standard.

  • Page 8: Instrument Re-Calibration

    3 wire probe (showing 3-3); the SPAN s force the instrument into a 4 wire measurement mode by pressing SPAN s until X = 4. To verify, allow the DP97 to ead the currently selected channel and press SPAN s X = 3 3 or 4 wire mode is allowable on either channel A or B i.e.
  • Page 9 Repeat steps (I) to (vi) for input B. The DP97 then returns to a normal power-up state, PRT A, degrees C. s ” and display will show a value close to 100 Ohms. If the s ” again and the instrument will compute the average value s ”...

  • Page 10: Analogue (Re-Transmission) Output

    Switch off the Instrument 1) Remove the jumper lead JP1. This is VITAL. Should the instrument be switched on with JP1 In position, the calibration is lost. 2) Replace the instrument cover. The instrument is now ready for normal use. The central processor is software driven and no other adjustments or modifications should be attempted.

  • Page 11: Rs232 Communications

    6. RS232 COMMUNICATIONS General Remote control will be seized by sending an RS232 character, and relinquished by sending the LOCAL command. While in remote control the front panel buttons will be locked out (inoperative) and the right hand decimal point will indicate remote operation (local lock-out).
  • Page 12 Command set: Display parameters: Analogue parameters: Measurement: Return to Local: Output Protocol Replies will depend on the command implemented, and will be numeric or – with commas and spaces as delimiters. All replies will be terminated by CR and LF. The first number will be an error code.
  • Page 13 For digital probe matching within the instrument (version 2.1 only) additional commands are used as follows: CORRECTIONS Whatever is set by this command is retained during power-down. Lists Ch A corrections Lists Ch B corrections Enter Ch A corrections Enter Ch B corrections Query Says “Not enabled”, “A”, “B”, “AB”...

  • Page 14: Use Of "Corrections Pc Software

    Using DP97 software & RS232 interface lead. Connect the RS232 interface lead to the DP97 and to the PC according to the Pin configuration shown in section 6). Switch on the instrument and PC iii) At the C:\>...
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  • Page 17 Using the software From MAIN MENU:- To input calibration values into the DP97 (up to 10 may be used per channel): º Click EDIT to obtain EDIT corrections menu. º Enter values against #01 through #10 but note that All 10 need not be entered When returning to main menu the Ù...

  • Page 18: Specifications

    Data for many probes can thus be stored. When using corrections the DP97 channel annunciation lights (A or B) will occult at 4 second intervals according to the channel selected. In A-B mode channel A and/or B annunciation lights occult at 8 second intervals.
  • Page 19 General Range/Sensor type Overall Instrument Accuracy (4 wire) Overall System Linearisation Conformity Stability (vs ambient temperature) Warm-up Time Pt100 Sensor Current Display Resolution Measurement Units Measurement Modes Custom Calibration (via PC software) Null Function Sensor Lead Resistance Supply Pt100 to IEC 751 (ITS 90 refers). –199.99 to 849.99°C.R 100 .
  • Page 20 Power Consumption Series Mode Rejection Common Mode Rejection Ambient Temperature Range EMC Compliance CE Compliance Display Front Panel Controls Input Connections Mechanical Mechanical/Case Dimensions Weight Charger requirement 10 – 11.5V d.c. 1A. 10W nominal. Max 20W when battery is charging. 60dB @ 50Hz (50mV rms applied).
  • Page 21 Communications RS232 (standard) PC Software (standard) Analogue Output (standard) WARRANTY/DISCLAIMER Remote control and measure, Isolated, 9600 Baud, 8 data, no parity, 1 stop bit. PC software running in MS DOS allows programming (standard) of custom calibration and preview of set values from a PC.
  • Page 22 OMEGA ENGINEERING, INC. period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
  • Page 23 USA: One Omega Drive, P.O. Box 4047 ISO 9001 Certified Stamford CT 06907-0047 TEL: (203) 359-1660 e-mail: Canada: 976 Bergar Laval (Quebec) H7L5A1 TEL: (514) 856-6928 e-mail: For immediate technical or application assistance: USA and Canada: Sales Service: 1-800-826-6342 / 1-800-TC-OMEGA Customer Service: 1-800-622-2378 / 1-800-622 BEST Engineering Service: 1-800-872-9436 / 1-800-USA-WHEN TELEX: 996404...
  • Page 24 Process Measurement and Control? Shop online at www.omega.com TEMPERATURE þ Thermocouple, RTD 7 Thermistor Probes, Connectors, Panels & Assemblies þ Wire: Thermocouple, RTD & Thermistor þ Calibrators and Ice Point References þ Recorders, Controllers & Process Monitors þ Infrared Pyrometers PRESSURE, STRAIN AND FORCE þ...

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