Teledyne MX300 manual √ Sensor

Service Manual MX300

Symptom	Why	What To Do
The sensor does not	Water is condensing	A) Remove the sensor from tee
react to changes in	on the sensing	adapter and unscrew the
oxygen concentration,	surface.	plastic flow diverter. Using
or the readings are	Electrical interference	absorbent tissue or cotton
unstable and drifting.		swab, gently wipe off sensing
	is disrupting the
		surface inside threaded
	electronics
		portion of sensor assembly.
		B) Relocate unit away from
		sources of electrical noise
		such as cauterizing equipment
		and two-way radios.
The display is flashing	The unit has detected	A) Check sensor cable
√ SENSOR	a fault in the signal	connections and make sure
	from the sensor.	they are completely inserted
	Sensor has expired.	into the mating connector
		and the capture nut is firmly
	The sensor has been	in place.
	exposed to a gas	B) Expose the sensor in 100%
	containing little or no
		O2 and check calibration.
	oxygen.
		C) The sensor output has fallen
		to a level where it is no longer
		usable. Replace sensor.
The oxygen reading	Like all O2 sensors,	A) During calibration, make
fluctuates or appears to	the R17MED detects	sure there is no restrictions
be incorrect.	the changes in the	on exhaust side of sensor. If
	partial pressure of	the reading changes with
	O2.	flow, the sensor is
		pressurized or there may be
		a leak in the system.
		B) If a high degree of accuracy
		is desired, or the
		concentration of O2 is in
		excess of 40%, calibration
		with 100% is recommended.
		C) If humidified gas is used to
		ventilate the patient, water
		vapor actually dilutes the
		gas. See Appendix:
		Humidity, Temperature.
		D) If a blender is used, check
		its calibration. See
		Appendix: Discrepancy in
		Readings.

Teledyne Analytical Instruments 40