Teledyne TED 191 instruction manual Section SIX Troubleshooting

SECTION SIX		TROUBLESHOOTING
SYMPTOM		CURE / REMARK
	1)	Check battery drawer is properly located.
No numeric display on	2)	Check battery polarity .
the LCD when powered	3)	Check batteries for replacement
on
	4)	External power : check polarity and voltage of supply;
		: check if functional on batteries.
	1)	Check calibration process (as described in section 1.4).
	2)	Check flow rate of calibrating gas (6 – 8 lpm)
	3)	Check sensor cell connection.
	4)	Check sensor cable connection.
Inability to achieve	5)	Check quality of calibration gas.
calibration
	6)	Check that the calibration gas is dry (not humidified).
	7)	Wait for 1 or 2 minutes, then attempt a re-calibration.
	8)	Check sensor cell for damage or electrolyte leaks.
	9)	Return monitor to authorized service agent for repair.
Constant non-mutable	1)	Check high and low alarm settings for possible “crossed” settings
alarm condition		i.e. high threshold value is set lower than low threshold value.
	1)	Do not hold the sensor whilst calibrating, as the warmth from your
		hand may cause the ambient temperature compensation circuit to
Drift is displayed		activate, resulting in unstable displayed values.
readings whilst	2)	Try calibrating a known “good” sensor.
calibrating or
immediately thereafter	3)	Repeat calibration.
	4)	Replace the sensor cell.

There is no reaction to changes in oxygen concentration

1)Remove the sensor tip from the T-adaptor, unscrew the “flow diverter” and gently swab any excess moisture off the sensor cell membrane, then flow dry gas over the membrane.

TELEDYNE ELECTRONIC TECHNOLOGIES

Analytical Instruments

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