Teledyne 100AH instruction manual 10-6, Lamp Ratio, Str Lgt, Drk Pmt

Teledyne API Model 100AH SO2 Analyzer Instruction Manual, 02417, Rev. D

Table 10-1: Test Functions (Continued)

Test Function	Factory Set-Up	Comment
UV LAMP	3000 - 4000 mV	This is the instantaneous reading of the UV lamp intensity.
		Typical UV lamp intensity is between 2000 mV and
		4000 mV. See Section 10.4.2 for how to peak the UV lamp
		output. Intensity lower than 600 mV will cause WARNING
		and below 350 mV will cause to display XXXXX.X.
		Low UV lamp intensity could be due to:
		1. Aging UV lamp.
		2.	Beam splitter out of alignment.
		3.	Faulty lamp transformer.
		4.	Aging or faulty UV detector.
		5.	Dirty optical components.
LAMP RATIO	80 - 120%	This is the computed value which is the ratio of current UV
		LAMP reading respect to the calibrated UV LAMP reading.
		Usually the ratio value drops as the aging lamp output decays.
		Low LAMP RATIO can cause the slope and offset out of
		typical range.
		See Section 10.4.2 how to reset the lamp calibration and
		LAMP RATIO.
STR LGT	<50 PPM	Stray light is the background light of the reaction cell
		expressed in PPM while sampling zero gas.
		High stray light could be caused by :
		1.	Aging UV filter.
		2.	Contaminated reaction cell.
		3.	Light leak.
		4.	Pneumatic leak.
DRK PMT	-50 ± 200 mV	This is the reading of the PMT signal without the UV lamp.
		When the lamp is momentarily turned off, the darkness inside
		of the reaction cell is monitored and compensated for any UV
		detector dark current drift or offset.
		High dark PMT reading could be due to:
		1.	Light leak.
		2.	Lamp not turning off completely.
		3. High PMT temperature.
		4.	High electronic offset.

(table continued)

10-6