Teledyne Fault Diagnosis with Test Functions, M102E/M501 TRS, Troubleshooting & Repair, Rev A1

TROUBLESHOOTING & REPAIR	M102E/M501 TRS
	(Addendum to M101E Manual - P/N 04740 Rev A)

10.1.2. Fault Diagnosis with Test Functions

The Following table supercedes Table 11.2 of the M101E Manual - P/N 04740 Rev A.

Table 10-2: Test Functions - Possible Causes for Out-Of-Range Values

TEST	NOMINAL	POSSIBLE CAUSE(S)
FUNCTION	VALUE(S)
	≤1 ppb with zero	Faults that cause high stability values are: pneumatic leak; low or very unstable
STABIL		UV lamp output; light leak; faulty HVPS; defective preamp board; aging PMT; PMT
	air
		recently exposed to room light; dirty/contaminated reaction cell.
SAMPLE FL	650 cm3/min	Faults can be caused by: clogged critical flow orifice; pneumatic leak; faulty flow
	± 10%	sensor; sample line flow restriction.
		High or noisy readings could be due to: calibration error; pneumatic leak; light
		leak (improper assembly); aging UV filter; low UV reference output; PMT recently
PMT	-20 TO 150 mV	exposed to room light; light leak in reaction cell; reaction cell contaminated; HVPS
	with zero air	problem.
		It takes 24-48 hours for a PMT exposed to ambient light levels to return to normal
		functioning.
		Noisy Norm PMT value (assuming unchanging SO2 concentration of sample gas):
NORM PMT	- -	Calibration error; HVPS problem; PMT problem; UV reference problem; UV lamp
		problem.
		This is the instantaneous reading of the UV lamp intensity. Low UV lamp intensity
UV LAMP	2000 -4000 mV	could be due 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.
		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
LAMP RATIO	30 TO 120%	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	40-100 ppb	High stray light could be caused by: aging UV filter; contaminated reaction cell;
		light leak; pneumatic leak.
DRK PMT	-50 - +200 mV	High dark PMT reading could be due to: light leak; shutter not closing
		completely; high pmt temperature; high electronic offset.
DRK LMP	-50 - +200 mV	High dark UV detector could be caused by: light leak; shutter not closing
		completely; 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 (I1C bus); relay burnt out
BOX TEMP	ambient	Incorrect temperature reading could be caused by: Environment out of
	+ ~ 5ºC	temperature operating range; broken thermistor; runaway heater
PMT TEMP	7ºC ± 2ºC	Incorrect temperature reading could be caused by: TEC cooling circuit broken;
	constant	High chassis temperature; 12V power supply
IZS TEMP	50ºC ± 1ºC	Malfunctioning heater; relay board communication (I1C bus); relay burnt out
(OPTION)
	ambient	Incorrect SAMPLE pressure could be due to: pneumatic leak; malfunctioning
PRESS		valve; malfunctioning pump; clogged flow orifices; sample inlet overpressure;
	± 2 IN-HG-A
		faulty pressure sensor
SLOPE	1.0 ± 0.3	Slope out of range could be due to: poor calibration quality ; span gas
		concentration incorrect; leaks; UV Lamp output decay.
		High offset could be due to: incorrect span gas concentration/contaminated zero
OFFSET	< 250 mV	air/leak; 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 across time
		zones; daylight savings time?

52 05514 Rev A1