DPC-30 DPC-100 Reference Manual
1. Introduction 1.1 Description The Martel DPC Digital Pneumatic Calibrator improves upon traditional dial gauge pneumatic calibrators. The Martel DPC improves accuracy, provides digital accuracy of ±0.035% and also incorporates mA and V inputs, and a built-in 24 volt loop power supply to simultaneously power a device while reading the resultant current. This equipment is designed primarily for field checking and calibration of pneumatic controls, switches and instrumentation.
1.2 Unpacking Remove the packing list and verify that all equipment has been received. Upon receipt of shipment, inspect the container and equipment for any signs of damage. Take particular note of any evidence of rough handling in transit. Immediately report any damage to the shipping agent. NOTE: THE CARRIER WILL NOT HONOR ANY CLAIMS UNLESS ALL SHIPPING MATERIAL IS SAVED FOR THEIR EXAMINATION. After examining and removing the contents, save packing material and carton in the event reshipment is necessary.
2.2.1 Selecting Engineering Units 1. Turn on the calibrator and select desired pressure range by pressing the “Range Select” key. 2. For voltage measurements press the “Volts” key. 3. For milliamp measurements or for switch testing press the “mA” key. Select from mA, %4-20, %10-50 or Switch (for testing pressure switches). 4. Electrical connections for milliamps are shown in Figures 1 and 2. Figure 1. Loop power is supplied by a power supply in the loop.
3. Turn handle of appropriate regulator counter-clockwise until spring in regulator is completely relaxed. 4. Turn handle of selector valve to appropriate position. 5. Turn on air supply, adjust pressure to desired value with regulator and compare gauge reading with the calibrator reading. 2.2.4 Calibration of Pneumatic Recorders or Indicators 1. Connect air supply and recorder or indicator as in 2.2.3, sentence 2 or 3 above. 2. Proceed as in 2.2.
2.2.7 Adjustment of Any Pneumatic Device in Which the Difference Between Two Signals Should Be Zero or Some Value Not Exceeding the Range of the Calibrator 1. Connect the two signals to P3 and “S” respectively with the higher pressure on P3. 2. Turn selector valve to P3. 3. Turn on the two signals simultaneously if possible. Otherwise turn on P3 first. WARNING: TO AVOID POSSIBLE SEVERE PERSONAL INJURY OR EQUIPMENT DAMAGE, THE PRESSURE APPLIED TO “S” MUST NOT EXCEED 105 PSI. 2.2.
3. Maintenance 3.1 General Care of Instrument This calibrator is a precision instrument. It has been constructed as ruggedly as the service for which it is intended will permit. Every precaution has been taken to prevent it from going out of adjustment when subjected to vibration and shock. In view of this, the instrument should be handled with care and protected against violent and sudden jolts. This instrument is intended for use with clean, dry, non-corrosive gas only. 3.
4. Specifications Accuracy: Size: (HWD) Weight: Pressure: ±0.035% of full scale mA, %4-20 mA, %10-50 mA: ±0.025% of full scale V: ±0.025% of full scale 0.
5. Warranty Martel Electronics Corporation warrants all products against material defects and workmanship for a period of twelve (12) months after the date of shipment. Problems or defects that arise from misuse or abuse of the instrument are not covered. If any product is to be returned, a “Return Material Authorization” form can be obtained from our website www.martelcorp.com under customer service. You can also call 1-800-821-0023 to have a form faxed.
www.martelcorp.com e-mail: sales@martelcorp.
