Teledyne 9110T instruction manual Pressure / Flow Sensor Assembly, Basic PCA Operation Check

Model 9110T NOx Analyzer Troubleshooting & Service

12.7.7. PRESSURE / FLOW SENSOR ASSEMBLY

The flow and pressure sensors of the 9110T 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:

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.

Teledyne Analytical Instruments 289