Rae Q-RAE, Operation And Maintenance Manual

Page: 58 / 170

PROGRAMMING
4 - 10
4.4.2 Multiple Sensor Calibration
This function simultaneously determines the second point
of calibration curves for multiple sensors in the monitor.
A four-gas mix (Typically CH
4
, CO, H
2
S, O
2
, balance N
2
)
is needed to perform this procedure. Connect the monitor
to the sample bag filled with mixed gas as shown in Figure
4-1.
1. Continuing from Step 4 of the previous section, the
display should show “ Multiple Sensor Calibration?”
Press the
[Y/+]
key. The display shows all the pre-
selected gases for the sampling bag filled with mixed
gas and “OK?” question. Press
[Y/+]
key to accept the
multiple sensor selection and start the calibration, or
press the
[N/-]
key to modify the sensor selection and
go to Step 7.
CO H
2
S
LEL OK? OXY
2. Turn on the valve of the sampling bag to start the flow
of the span gas. Display shows “Apply Mixed Gas”
and will wait for the calibration gas to reach the sensor.
When the calibration gas has reached the sensor the
display will show “calibration in progress… 60” with
the countdown timer shows the number of remaining
seconds while the monitor performs calibration. When
the countdown timer reaches 0, the display shows the
name of each sensor, the message “cal’ed!” and the
calibrated values for each gas. If no gas has reached
the sensor after 60 seconds, the display will show “ No
gas flow…” and abort the calibration.