®
PX540 Series
Pressure Transducers
Operator’s Manual: M1137/0698
General Description
The OMEGA
®
PX540 Pressure Transducer consists of a pressure connection section with welded stainless steel
diaphragm and a case for housing the electronic equipment and the electrical connection. The piezoresistive pres-
sure sensor is installed behind the diaphragm, with the intervening space filled with silicone oil as pressure trans-
mission liquid.
The pressure sensor’s signal is converted by an amplifier to a signal of 4 to 20 mA. The pressure connection DIN
3852 is used as a seal behind threads by means of the added NBR O-ring. (No flush-mounted seal).
Characteristics of this transducer include:
• 4 to 20 mA current output which is ideal for long distance signal transmitting and industrial environments.
• High accuracy and repeatability.
• Corrosion resistant, and
• Rugged NEMA=12 dust-tight/drip-tight enclosure.
How To Adjust Zero and Span
NOTE:
Unit has been factory calibrated. No adjustment is
required upon delivery from OMEGA Engineering.
Zero adjustment must be performed at no pressure
and the output reading must be 4 mA.
Span adjustment must be performed at full scale pres-
sure and the output reading must be 20 mA.
If you do not get either of these readings at the
required no pressure or full scale pressure, go through
the following procedure to get to the screws.
Remove the connector from the body of the transmit-
ter as described in steps 1 and 2 in the Wiring Section.
Adjust the zero screw so the output reading is 4 mA at
no pressure. At full scale pressure, the output must be
20 mA; if it is not, adjust the span screw.
The Zero screw is marked with a white dot. The span
screw is marked with a red dot. Refer to Figure 1.
Figure 1.
Location of Adjustment
Screws
