Teledyne 6200T - Sulfides Analyzer - Manual (Page 259)

6200T Total Sulfur Analyzer Troubleshooting
Teledyen Analytical Instruments 259
Table 12-9: Example of HVPS Power Supply Outputs
If HVPS reading = 700 VDC
PIN PAIR NOMINAL READING
KEY
5
6
7
8
9
10
11 1
2
3
4
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.
12.6.15. Pneumatic Sensor Assembly
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.
12.6.16. Sample Pressure
Measure the voltage across test points TP1 and TP4. With the sample pump
disconnected or turned off, this voltage should be 4500
 250 mV. With the pump
running, it should be about 0.2 V less as the sample pressure drops by about 1 in-Hg-A
from ambient pressure. If this voltage is significantly different, the pressure transducer
S2 or the board may be faulty. A leak in the sample system to vacuum may also cause
this voltage to be between about 0.6 and 4.5. Ensure that the front panel reading of the
sample pressure is at about 1 in-Hg-A less than ambient pressure.
12.6.17. IZS Option
The zero/span valves and IZS options need to be enabled in the software (contact the
factory on how to do this). Refer to Figure 3-19 and Figure 3-20 for a flow diagram with
zero/span valve or IZS option.
 Check for the physical presence of the valves or the IZS option.
 Check that a working perm-tube is installed in the IZS oven assembly.
 Check front panel for correct software configuration. When the instrument
is in SAMPLE mode, the front panel display should show CALS and CALZ
buttons in the second line of the display. The presence of the buttons
indicates that the option has been enabled in software. In addition, the IZS