Pressure / Flow Sensor Assembly - Teledyne T200 Operation Manual

Teledyne API – T200 NO/NO

12.7.7. PRESSURE / FLOW SENSOR ASSEMBLY

12.7.7.1. BASIC PCA OPERATION CHECK:
12.7.7.2. SAMPLE PRESSURE SENSOR CHECK:
06858E DCN7057
/NO Analyzer Operation Manual
2 X
The flow and pressure sensors of the T200 are located on a PCA just behind the PMT
sensor (see Figure 3-5) can be checked with a voltmeter.
Figure 12-6: Pressure / Flow Sensor Assembly
The following procedure assumes that the wiring is intact and that the motherboard and
power supplies are operating properly:

Measure the voltage between TP2 and TP1 C1 it should be 10 VDC ± 0.25 VDC. If
not then the board is bad. Replace the PCA.
1. Measure the pressure on the inlet side of S1 with an external pressure meter.
2. Measure the voltage across TP4 and TP1.

The expected value for this signal should be:
=
Expected mVDC
EXAMPLE: If the measured pressure is 20 Hg-in-A, the expected voltage level between
TP4 and TP1 would be between 2870 mVDC and 3510 mVDC.
EXAMPLE: If the measured pressure is 25 Hg-in-A, the expected voltage level between
TP4 and TP1 would be between 3533 mVDC and 4318 mVDC.
(
Pressure
x
4660
30.0
Hg-In-A
Troubleshooting & Service
)
± 10%
+
250
mvDC mvDC
rdg
255