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TELEDYNE INSTRUMENTS M100EU – OPERATIONS MANUAL
TROUBLESHOOTING & REPAIR
Addendum to M100E Manual - P/N 04515
Table 11-1: Test Functions - Possible Causes for Out-Of-Range Values
TEST
FUNCTION
NOMINAL
VALUE(S)
POSSIBLE CAUSE(S)
NORM PMT - -
Noisy Norm PMT value (assuming unchanging SO
2
concentration of sample gas):
Calibration error; HVPS problem; PMT problem; UV reference problem; UV lamp problem.
UV LAMP 2000 - 4000 mV
This is the instantaneous reading of the UV lamp intensity. Low UV lamp intensity could be
du
e to: aging UV lamp; UV lamp position out of alignment; faulty lamp transformer; aging or
faulty UV detector; dirty optical components.
Intensity lower than 600 mV will
cause UV LAMP WARNING.
UV STAB 0 to 100 mV Unstable lamp or failed UV lamp driver.
LAMP RATIO 30 TO 120%
The current output of the UV reference detector divided by the reading stored in the CPU’s
memory
from the last time a UV Lamp calibration was performed. Out of range lamp ratio
could be due to: malfunctioning UV lamp; UV lamp position out of alignment; faulty lamp
transformer; aging or faulty UV detector; dirty optical components; pin holes or scratches in the
UV optical filters; light leaks.
STR LGT <100 ppb
High stray light could be caused by: aging UV filter; contaminated reaction cell; light leak;
pneum
atic leak.
DRK PMT 200 - 325 mV
High dark PMT reading could be due to: light leak; high pmt temperature; high electr
onic
offset.
DRK LMP -50 - +200 mV High dark UV detector could be caused by: light leak; high electronic offset.
HVPS ≈ 400 V to 900 V Incorrect HVPS reading could be caused by; HVPS broken; preamp board circuit problems.
RCELL TEMP 50ºC ± 1ºC
Incorrect temperature reading could be caused by
: malfunctioning heater; relay board
communication (I
1
C bus); relay burnt out
BOX TEMP
ambient
+ ~ 5ºC
Incorrect temperature reading could be caused by: Environment out of temperature
operating range;
broken thermistor; runaway heater
PMT TEMP 7ºC ± 2ºC constant
Incorrect temperature reading could be caused by: TEC cooling circuit broken; High chassis
temperatur
e; 12V power supply
IZS TEMP
(OPTION)
50ºC ± 1ºC Malfunctioning heater; relay board communication (I
1
C bus); relay burnt out
PRESS
ambient
± 2 IN-HG-A
Incorrect SAMPL
E pressure could be due to: pneu
matic leak; malfunctioning valve;
malfunctioning pump; clogged flow orifices; sample inlet overpressure; faulty pressure
sensor
SLOPE 1.0 ± 0.3
Slope out of range could be due to: poor calibration quality ; span gas concentration incorrect;
l
eaks; UV Lamp output decay.
OFFSET < 250 mV
High offset could be due to: incorrect span gas concentration/contaminated zero air/le
ak; low-
level calibration off; light leak; aging UV filter; contaminated reaction cell; pneumatic leak.
TIME OF DAY Current time
Incorrect Time could be caused by: Internal clock drifting; move acr
oss time zones; daylight
savings time?
28 05944 Rev B
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