Teledyne MX300 - Manual (Page 20)

Operating Instructions MX300
Teledyne Analytical Instruments 12
play flashing 00.0. Only the CAL and ON/OFF (I/O) keys are functional at this
point. Reset the alarm set points after calibrating the Monitor.
Note: For first time and for routine maintenance calibrations, make sure that the sen-
sor and sensor cable are installed correctly before attempting to calibrate the
Monitor.
Figure 2-7: Calibration Sequence
To calibrate the Monitor (See Figure 2-7):
1. Turn the unit on by pressing the ON/OFF (I/O) key.
2. Check the batteries by pressing the BAT TEST key.
3. If the LCD is not flashing, press the LOCK/UNLOCK key to unlock
the keys. LCD will flash indicating that changes can be made to the
settings. If the batteries have just been installed the LCD will flash
00.0
4. As with most oxygen monitors, the highest level of accuracy is
achieved when calibration is conducted using 100% oxygen. After in-
stalling 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 flow-
ing 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 ensure that the sample line is completely
purged with the calibration gas. Press the CAL key. The LCD will
count down from 9 to 0. The Monitor electronics will measure the
sensor output during this countdown to determine the gas concentra-
tion and selects the calibration range of either 100% or 20.9%. When
the calibration is complete, the LCD will display the gas value.