Shutter system, Pmt sensor, Pmt preamplifier board – Teledyne 6200T - Sulfides Analyzer User Manual
Page 257: Pmt temperature control pca, 6200t total sulfur analyzer troubleshooting, Teledyen analytical instruments 257
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.