User guide
6200T Total Sulfur Analyzer Troubleshooting
Teledyen Analytical Instruments 257
12.6.10. Shutter System
To check the functionality of the UV light Shutter by manually activating it:
EXIT 4x’s to return
to the
SAMPLE display
DIAG I / O 36) UVLAMP_SIGNAL= 3.4 MV
PREV NEXT JUMP PRNT EXIT
SAMPLE RANGE = 500.000 PPB SO2 =XXX.X
< TST TST > CAL SETUP
SAMPLE ENTER SETUP PASS : 818
8 1 8 ENTR EXIT
SETUP X.X PRIMARY SETUP MENU
CFG DAS RNGE PASS CLK MORE EXIT
DIAG SIGNAL I / O
PREV NEXT JUMP ENTR EXIT
DIAG I / O 0) EXT_ZERO_CAL=OFF
PREV NEXT JUMP PRNT EXIT
Press these buttons
until 32 is displayed
DIAG I / O JUMP TO: 01
0 1 ENTR EXIT
Activate the
Dark Shutter
DIAG I / O 32) DARK_SHUTTER=OFF
PREV NEXT JUMP OFF PRNT EXIT
SETUP X.X SECONDARY SETUP MENU
COMM VARS DIAG EXIT
EXIT returns
to the main
SAMPLE display
DIAG I / O 32) DARK_SHUTTER=ON
PREV NEXT JUMP ON PRNT EXIT
DIAG I / O JUMP TO: 32
3 2 ENTR EXIT
Press these buttons
until 36 is displayed
UV LAMP_SIGNAL
should be
<20 mV
Figure 12-5: Manual Activation of the UV Light Shutter
12.6.11. PMT Sensor
The photo multiplier tube detects the light emitted by the UV excited fluorescence of
SO
2
. It has a gain of about 500000 to 1000000. It is not possible to test the detector
outside of the instrument in the field. The best way to determine if the PMT is working
properly is by using the optical test (OTEST), which is described in Section 5.9.4. The
basic method to diagnose a PMT fault is to eliminate the other components using
ETEST, OTEST and specific tests for other sub-assemblies.
12.6.12. PMT Preamplifier Board
To check the correct operation of the preamplifier board, we suggest the technician carry
out the electrical and optical tests described in 5.9.4 and 5.9.5.
If the ETEST fails, the preamplifier board may be faulty.
12.6.13. PMT Temperature Control PCA
The TEC control printed circuit assembly is located on the sensor housing assembly,
under the slanted shroud, next to the cooling fins and directly above the cooling fan.
If the red LED located on the top edge of this assembly is not glowing the
control circuit is not receiving power.