Portable Oxygen Monitor OPERATING & SERVICE INSTRUCTIONS MX300-I

Portable Oxygen Monitor Operation

Teledyne Analytical Instruments 21

made to the settings. If the batteries have just been installed

the LCD will flash 00.0

4. As with most oxygen analyzer(s) the highest level of

accuracy is achieved when calibration is conducted using

100% oxygen. After installing the flow diverter as noted in

Section 2.1.1, insert the sensor into the plastic tee and

connect to a supply of pure dry oxygen flowing at 1-2 liters

per minute.

Note: An accessory calibration assembly (P/N C53790) is

available from Teledyne for use with the R17MED sensor

5. Wait about 20 seconds to insure the sample line is completely

purged with the calibration gas. Press the CAL key. The

LCD will count down from 9 to 0. During this time the

microprocessor is measuring the sensor output to determine

the gas concentration and selects the calibration range i.e.

100% or 20.9%. When the calibration is complete the LCD

will display the gas value. Press the LOCK/UNLOCK key to

save the calibration data.

Note: The MX300-I can only be calibrated using 100% oxygen or

room air 20.9%. Improper calibration or use of other gas

concentrations will activate the

√

SENSOR indicator. To

repeat the calibration press the LOCK/UNLOCK key and

press the CAL key.

6. Remove the sensor from the oxygen supply and confirm the

LCD reads less than 22% in room air. It is not necessary for

it to read exactly 20.9%.

7. It is important to perform the calibration carefully and

thoroughly, using calibration gases that are free from

contaminates. Wait for a stable reading before locking in

calibration point. The accuracy of the instrument is only as

good as the procedure used to calibrate it.

Note: A single point air calibration is not recommended unless

the sensor can be exposed to a known source of fresh

outdoor air. Hospital room air is often enriched with

excess oxygen, which will introduce errors into the

calibration. Air calibration should only be used for

monitoring oxygen levels between 21% and 40% and