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RDP Customer Document
Technical Manual
TRANSDUCER AMPLIFIER
TYPE DR7DC
Doc. Ref CD2401L
Affirmed by Declaration
of Conformity
USA & Canada
All other countries
RDP Electrosense Inc.
RDP Electronics Ltd
2216 Pottstown Pike
Grove Street, Heath Town,
Pottstown, PA 19465
Wolverhampton, WV10 0PY
U.S.A.
United Kingdom
Tel (610) 469-0850
Tel: +44 (0) 1902 457512
Fax (610) 469-0852
Fax: +44 (0) 1902 452000
E-mail
info@rdpe.com
E-mail:
sales@rdpe.com
www.rdpe.com
www.rdpe.com
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Table of Contents
Related Manuals for RDP DR7DC
Summary of Contents for RDP DR7DC
- Page 1 RDP Customer Document Technical Manual TRANSDUCER AMPLIFIER TYPE DR7DC Doc. Ref CD2401L Affirmed by Declaration of Conformity USA & Canada All other countries RDP Electrosense Inc. RDP Electronics Ltd 2216 Pottstown Pike Grove Street, Heath Town, Pottstown, PA 19465 Wolverhampton, WV10 0PY U.S.A.
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Page 2: Table Of Contents
INDEX INTRODUCTION ..................... 3 Certificate of EMC conformity .................. 4 INSTALLATION INSTRUCTIONS ................5 EMC Requirements ....................5 Unit Mounting ......................5 CONNECTIONS ...................... 6 Connections General ....................6 Internal Controls ...................... 6 Transducer connections ..................7 Full bridge Strain Gauge Transducer ..............7 1/4 or 1/2 bridge transducer connections .............. -
Page 3: Introduction
INTRODUCTION The DR7DC is a single channel DC amplifier intended to provide variable excitation and signal amplification for strain gauge type transducers. It provides up to 10V output (or 4- 20mA) with transducer signals from 10 mV to 10V. This allows operation with some high output transducers (DCTH, etc);... -
Page 4: Certificate Of Emc Conformity
Wolverhampton West Midlands WV10 0PY United Kingdom We declare that the product described in this technical manual is manufactured by RDP Electronics Limited and performs in conformity to the following: The Electromagnetic Compatibility Directive 2014/30/EU RoHS2 Directive 2011/65/EU R D Garbett... -
Page 5: Installation Instructions
DR7DC SCN terminal. Unit Mounting The DR7DC housing is a standard DIN rail enclosure which can clip directly to a 35 mm top hat rail. The units can be mounted side by side if an ambient temperature up to 40C. -
Page 6: Connections
16 N/C Internal Controls To access internal controls the front part of the DR7DC case needs to be removed. To do this, use a small screw driver to gently press in the clips behind terminal 1-4 and 13-16. At the same time pull forward the front of the case. The front of the case and pcb assembly should now slide forward. -
Page 7: Transducer Connections
DR7DC PCB. This requires removal of the PCB from the case. R22 replaces bridge arm D, R23 replaces bridge arm A, R24 replaces bridge arm B Note: Mounting these resistors in the instrument is a compromise. -
Page 8: Controls
CONTROLS Voltage/Current Output: Voltage output is between pins 9 and 10 (common). Current output is between pins 12 and 11 (common). Pins 10 and 11 are internally connected. Excitation allowing continuous variation of excitation between 3v and 10v. Zero allowing a fine adjustment of output zero of approximately ±2V (or 0-10mA) depending on Fine Gain setting. -
Page 9: 4-20Ma Offset Jumper Link J1
4-20mA Offset Jumper Link J1 Normally, with J1 set B-D, the relationship between input signal, voltage output and current output, is zero to full scale input signal 0 to 5V or 4-20mA output. For bipolar operation, e.g. for compressive/tensile load applications, J1 may be changed to A-C which makes the relationship ±... -
Page 10: Shunt Calibration Facility
SHUNT CALIBRATION FACILITY Refer to Section 4.6 for Operation This is applicable to resistance bridge transducers only, e.g. most load cells and pressure transducers (not semi-conductor gauges). The Shunt Calibration Facility can be used as:- A Calibration Check. When the prime calibration has been made by applying a precise known pressure or load to the transducers as described in Section 5 or 6, the R-CAL relay can be operated (normally with zero pressure or load applied) and the output recorded as the Calibration Check figure. -
Page 11: Specification
Check that if D works, the transducer is zero when attempting to obtain ZERO o/p. Check EXCITATION setting with the transducer disconnected. Try another transducer if possible, otherwise return transducer to factory. Try another DR7DC if possible, otherwise contact us for a returns number. -
Page 12: Warranty And Service
IMPORTANT NOTES. No service work should be undertaken by the customer while the unit is under warranty except with the authorisation of RDP Electronics. If the instrument is to be returned to R.D.P. Electronics for repair, (including repair under warranty) it is essential that it is suitably packed and that carriage is insured and prepaid.
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