0.5 VDC to 4.5 VDC ratiometric versions - PENN Controls - LIT-12011190 - P499RAP - P499RAPS - P499RCP - P499RCSS - Pressure Transducer - P499 Electronic Pressure Transducer

P499 Series Electronic Pressure Transducers Product/Technical Bulletin

PENN Controls
Product name
P499 Electronic Pressure Transducer
Document type
Product Bulletin
Technical Bulletin
Document number
Part number
Document revision
Revision date

About this task

The ratiometric versions of the P499 transducer receive a constant 5 VDC (nominal) supply voltage and vary the output signal voltage, based on the sensed pressure. The output voltage varies from 10% to 90% of the supply voltage, providing a 0.5 VDC to 4.5 VDC (nominal) signal.

Important: The 0.5 VDC to 4.5 VDC ratiometric transducers are rated for 5.0 ±0.25 VDC, Safety Extra-Low Voltage (SELV) or Class 2. Exceeding the supply voltage rating can damage the transducer and void any warranties.


To verify that the transducer is working properly, complete the following steps.

  1. With the transducer in place and the controlled system pressure stabilized, measure the pressure at the transducer with an accurate and reliable gauge. This is the measured pressure (P).
  2. Determine the maximum (Pmax) and minimum (Pmin) pressure values for the transducer’s pressure range. (See Table 1, Table 2, or Table 3.)
  3. Measure the voltage between Supply (red) wire and Common (black) wire. (See Figure 1.) Use this in Step 3 as the measured supply voltage, Vs.
  4. Use the equation in Figure 1 to determine the calculated output voltage for the ratiometric transducer.
    Figure 1. Voltage calculation for 0.5 VDC to 4.5 VDC ratiometric transducers

  5. Using your multimeter, measure the DC voltage between the transducer Output (white) wire and Common (black) wire. See (Figure 1 ). This is the measured output voltage.
  6. Compare the calculated output voltage (Step 4) and the measured output voltage (Step 5). If the measured output voltage differs greatly from the calculated output voltage, replace the transducer.
    Note: It is normal for the transducer reading to differ somewhat from pressure gauge readings due to voltmeter and gauge tolerances, and other factors.