Pneumatic Sensor Assembly; Table 11-9: Example Of Hvps Power Supply Outputs - Teledyne t100 Operation Manual

Teledyne API - T100 UV Fluorescence SO
11.6.15.

PNEUMATIC SENSOR ASSEMBLY

06807F DCN7335
Analyzer
2
independent power supplies, one to each pin of the PMT. The test procedure below
allows you to test each supply.
1. Check the HVPS test function via the front panel and record the reading level.
Adjustment of the HVPS output level is covered in the hardware calibration
procedure in Section 11.7.2.8.
2. Turn off the instrument.
3. Remove the cover and disconnect the 2 connectors at the front of the PMT housing.
4. Remove the end plate from the PMT housing.
5. Remove the HVPS/PMT assembly from the cold block inside the sensor. Un-plug
the PMT.
6. Re-connect the 7 pin connector to the Sensor end cap, and power-up the
instrument.
7. Check the voltages between the pairs of pins listed in Table 11-9. The result for
each pair should be equal and approximately 10% of the reading level recorded in
Step 1.

Table 11-9: Example of HVPS Power Supply Outputs

If HVPS reading = 700 VDC
PIN PAIR NOMINAL READING
1  2
70 VDC
2  3
70 VDC
3  4
70 VDC
4  5
70 VDC
5  6
70 VDC
6  7
70 VDC
7  8
70 VDC
8. Turn off the instrument power, and re-connect the PMT tube, and then re-assemble
the sensor.
If any faults are found in the test, the HVPS must be replaced. There are no user
serviceable parts inside the HVPS.
The pressure/flow sensor circuit board, located behind the sensor assembly, can be
checked with a voltmeter using the following procedure, which assumes that the wiring
is intact and that the motherboard and the power supplies are operating properly.
• Measure the voltage across TP1 and TP2, it should be 10.0 ± 0.25 V. If not, the
board may be faulty.
•
Measure the voltage across capacitor C2; it should be 5.0 ± 0.25 V. If not, the board
may be faulty.
Troubleshooting & Service
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