Teledyne T200, Руководство по эксплуатации, Страница: 257 / 425

Teledyne API
– T200 NO/NO
2
/NO
X
Analyzer Operation Manual Troubleshooting & Service
255
12.7.7. PRESSURE / FLOW SENSOR ASSEMBLY
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:
12.7.7.1. BASIC PCA OPERATION CHECK:

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.
12.7.7.2. SAMPLE PRESSURE SENSOR CHECK:
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 4660
mvDC
250
mvDC
+ x
( )
=
Pressure
30.0
Hg-In-A
± 10%
rdg
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.
06858E DCN7057