Teledyne T100, Instruction Manual, Page: 280 / 404

Troubleshooting & Repair Teledyne ML - T100 UV Fluorescence SO2 Analyzer
280 06807A(DCNxxxx)
10.6.10. 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 33) 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
Toggle these keys
until 29 is displayed
DIAG I / O JUMP TO: 01
2 9 ENTR EXIT
Activate the
Dark Shutter
DIAG I / O 29DARK_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 29DARK_SHUTTER=ON
PREV NEXT JUMP ON PRNT EXIT
DIAG I / O JUMP TO: 01
33 ENTR EXIT
Toggle these keys
until 33 is displayed
UV LAMP_SIGNAL
should be
<20 mV
Figure 10-5: Manual Activation of the UV Light Shutter
10.6.11. 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 4.8.5. The basic method
to diagnose a PMT fault is to eliminate the other components using ETEST , OTEST and
specific tests for other sub-assemblies.
10.6.12. 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 4.8.5 and 4.8.6.
If the ETEST fails, the preamplifier board may be faulty.