Omega Vehicle Security PX791 & PX792 SERIES, Omega Sanitary Pressure Transducer, W A R N I N G

PX791 & PX792 SERIES

OMEGA® SANITARY PRESSURE TRANSDUCER

INSTRUCTION SHEET

W A R N I N G !

This instrument is susceptible to damage when exposed to static electrical charges. To avoid damage to the transducer observe the following:

•Ground the body of the transducer BEFORE making any electrical connections

•When disconnecting, remove the ground LAST.

NOTE: The braided shield and drain wire in the cable (if supplied) is not connected to the transducer body, and is not a suitable ground.

CAUTION: Pressure spikes in excess of the rated overpressure capabil- ity of the transducer may cause irreversible electrical and/or mechani- cal damage to the pressure measuring and containing element(s).

Mounting

Although the unit can withstand normal vibra- tion without damage or significant output effects, it is always good practice to mount the transducer where there is minimum vibration. Be sure to use a gasket that does not interfere with the sanitary diaphragm. If the gasket I.D. is smaller than 1.50 inches, an offset due to clamping force will occur.

Power Supply

Excitation (Ratiometric Output Only)

For proper operation a voltage within the range of 5 to 10 Vdc must be applied between the transducer’s supply terminals.

Noise

For minimum noise susceptibility, avoid running the transducer’s cable in a conduit that contains high current AC power cables. Where possible avoid running the cable near inductive equipment.

The supply voltage for the 1-5 and

1-6 Vdc output transducers must be within the range of 10 to 36 Vdc. The maximum supply voltage for a 4-20mA current output transducer is 36 Vdc while the minimum supply voltage is dependent upon the loop resistance of the circuit. Refer to Figure 1. The loop supply voltage vs. loop resistance shows the minimum supply voltage (Vmin) required for a given loop resistance (RLOOP).

Shield Wiring

Connect the braided shield to the guard terminal on the reading instrument (meter, etc.) if avail- able or to ground or to the power supply nega- tive terminal.

Adjustment Potentiometers

The zero and span pots are accessible through the top of the case. Loosen the four screws and separate the top carefully. The zero pot is marked with a white dot.