Teledyne 6400EH - Sulfur Dioxide Analyzer - Manual (Page 60)

Troubleshooting Model 6400EH
Teledyne Analytical Instruments 48
CAUTION: ALWAYS WEAR UV-PROTECTIVE, SAFETY
GLASSES WHEN WORKING WITH THE UV LAMP
ASSEMBLY.
1. Set the analyzer display to show the signal I/O function,
UVLAMP_SIGNAL (see Section 11.1.3). UVLAMP_SIGNAL is
function 33.
2. Slightly loosen the large brass thumbscrew located on the shutter
housing (see Figure 10-3) so that the lamp can be moved.
3. While watching the
UVLAMP_SIGNAL reading, slowly rotate the
lamp or move it back and forth vertically until the
UVLAMP_SIGNAL reading is at its maximum.
 DO NOT grasp the UV lamp by its cap when changing its
position (see Figure 10-3). Always grasp the main body of
the lamp.
4. Compare the
UVLAMP_SIGNAL reading to the information in
Table 10-3 and follow the instructions there.
Table 10-3: Example of HVPS Power Supply Outputs
UVLAMP_SIGNAL ACTION TO BE TAKEN
3500mV±200mV. No Action Required
> 4900mV at any time.
Adjust the UV reference detector potentiometer (see Figure 10-4) until
UVLAMP_SIGNAL
reads approximately 3600mV before continuing to adjust the lamp
position.
>4500mV or < 1000mV
Adjust the UV reference detector potentiometer (see Figure 10-4) until
UVLAMP_SIGNAL
reads as close to 3500mV as possible.
.< 600mV Replace the lamp.
5. Finger tighten the thumbscrew.
Note: DO NOT over-tighten the thumbscrew.