Teledyne MX300 manual Troubleshooting

Portable Oxygen Monitor Service Manual

Note: The MSDS on this material is located in the Appendix. It is also available upon request through the Teledyne Environmental, Health and Safety Coordinator. Contact at

(626)934-1592

3.8Troubleshooting

The MX300 oxygen monitor provides a variety of built-in safety features that prevents its use when a fault is detected. When a unit displays the message √ SENSOR and sounds the audible and visual alarm continuously, it is an indication of a faulty connection between the sensor and the unit or an expired or faulty sensor. To determine where the difficulty lies, refer to the following guidelines in Table 3-1.

Table 3-1 Troubleshooting

Symptom	Why	What To Do
New sensor responds	If the sensor is new	A) Wait 1–2 hours and
slow or drifts.	and was just	recalibrate.
	removed from its
	sealed bag it may
	need to run for
	several hours.
Sensor will not read	Calibration in 100%	A) Recalibrate using dry gas
below 22 % after	was invalid or the	making sure the reading
calibration in 100% O2.	room air is	stabilizes before making
	contaminated with	any adjustments.
	excess oxygen.	B) Make sure that at least 6"
		(30 cm.) of tubing is
		attached to the exhaust
		side of the tee adapter to
		prevent back filling. O2 flow
		rate should not exceed 5
		l/min.
		C) Oxygen concentration at the
		sensor is significantly higher
		than 21%. Take the
		instrument to a well-
		ventilated area and check
		the reading again.
		D) Try calibrating with a known
		good sensor; if this fails, see
		symptom "Reading drifts
		over 2–3%..."

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