Omega Engineering DP97 manuel d'utilisation

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CONTENTS PAGE 1. INTRODUCTION 1 Full description of the DP97 Front Panel information at a glance 2. INSTALLATION 3 Supply Connection Input connections – Sensors 3. OPERATION 4 i) To read sensor temperature directly ii) To read differential temperature iii) Matching DP97 to calibrated sensors iv) Error indications v) ¾ wire recognition 4. INSTRUM[...]

1. INTRODUCTION A high precision portable thermometer for metrology and other exacting laboratory applications, the DP97 is a proven instrum ent used world wide as a laboratory and site standard in pharmaceuticals, medical, food, environmental testing, R & D, and general industrial applications. It is particularly suitable as the reference stan[...]

Front Panel Information at a Glance: when you switch on To obtain a reading from a temperature sensor, select channel A or B (1) and select the required units (2). The appropriate indicator LED indicates the selected channel and units. For version 2.1, the A and/or B LED indicators, according to the channel selected, cycle between a steady on state[...]

2. INSTALLATION Back Panel General a) The standard version is for bench - top use. Retractable legs can be extended to provide a convenient viewing angle. b) The optional version permits the installation of the DP97 into a suitable panel cut out. Supply Connection Primary power is provided by the internal, rechargeable sealed lead - acid battery wh[...]

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 swit ch. 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 t[...]

iii) 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 Ω versus °C values corresponding t o accurately known reference temperatures. Up to 10 sets of values per sensor can be fed into th[...]

If using a shorter leadout from the probe or thicker gauge cable, pleas e ensure that the DP97 is in the correct wire recog nition mode. This can be checked by pressing the SPAN s s button ONCE. Two numbers will be displayed e.g. 3 - 4. The first digit being the X parameter (e.g.3) and the second digit being the Y parameter (e.g.4). These displayed[...]

Page 6 The calibration kit option (two precision resistors) is required to perform re - calibration. No additional instruments are required since the DP97 self - calibrates as follows: Caution: Do not proceed unless specified resistors are available. Failure to do so may invalidate the warranty. a) With the supply disconnected, remove the i nstrume[...]

Page 7 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. If it [...]

Page 8 6. RS232 COMMUNICATIONS General Rem ote 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 (loca l lock - out). RS232 parameters will be a fixed bau[...]

Page 9 Command set: Display parameters: UNITS OHMS UNITS C UNITS K UNITS F INPUT A INPUT B INPUT A - B Analogue parameters: SPAN Value in Ohms ZERO Value in Ohms Measurement: MEASURE Return to Local: LOCAL Output Protocol Replies will depend on the command implemented, and wil l be numeric or – with commas and spaces as delimiters. All replies wi[...]

Page 10 For digital probe matching within the instrument (version 2.1 only) additional commands are used as follows: CORRECTIONS A (turns OFF B corrections) Turns A on B (turns OFF A corrections) Turns B on AB (turns ON BOTH A & B corrections) OFF (turns OFF BOTH A & B corrections) Whatever is set by this command is retained during power - [...]

Note: Use of the DP97 “ CORRECTIONS PC SOFTWARE ” supplied with the instrument facilitate the correction procedure by means of a much simplified, user - friendly approach described below. 7. USE OF CORRECTIONS PC SOFTWARE for Digital Probe Matching a) Instrument set - up and software loading PC Requirements: Any PC running in MS - DOS and havin[...]

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b) 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 agains t #01 through #10 but note that i) All 10 need not be entered ii) When returning to main menu the Ù values are sorted into ascending order. If the corresponding [...]

Stored values can be viewed at any time as follows: º From Main Menu, click CHANNEL to select channels A OR B º Click READ Stored values can be changed at any time by repeating input procedure. Stored Values can be cleared from the DP97 at any time as follows: º From Main Menu, click CHANNEL A < - > B º Click DISABLE º Click PRINT in loa[...]

General Ra nge/Sensor type Pt100 to IEC 751 (ITS 90 refers). – 199.99 to 849.99°C.R o = 100 Ω . Two input channels, each 3 or 4 wire connection with automatic recognition (with manual overrride). Overall Instrument ±0.02°C ± 1 digit for range - 200°C to +500°C. Accuracy (4 wire) ±0.005% reading ± 1 digit for range 500°C to 850°C. Over[...]

Charger requirement 10 – 11.5V d.c. 1A. Power Consumption 10W nominal. Max 20W when battery is charging. Series Mode Rejection 60dB @ 50Hz (50mV rms applied). Common Mode Rejection 30V rms applied between input and earth produces no measurable effect. Ambient Temperature Range 0 - 50°C non - condensing. Ensure stable temperature range for best a[...]

Communications RS232 (standard) Remote control and m easure, Isolated, 9600 Baud, 8 data, no parity, 1 stop bit. PC Software (standard) PC software running in MS DOS allows programming (standard) of custom calibration and preview of set values from a PC. Also provides a print facility and storage of sets of correction values. Analogue Output (stand[...]

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA’s WARRANTY adds an additional one (1) mo nth grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA’s customers receive maximum covera[...]

USA: One Omega Drive, P.O. Box 4047 ISO 9001 Certified Stamford CT 06907 - 0047 TEL: (203) 359 - 1660 FAX: (203) 359 - 7700 e - mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L5A1 TEL: (514) 856 - 6928 FAX: (514) 856 - 6886 e - mail: info@omega.ca For immediate technical or application assistance: USA and Canada: Sales Service: 1 - 800 - [...]

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