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Single Sensor Span Calibration
Instead of performing a span calibration on
multiple sensors simultaneously, you can select a
single sensor and perform a span calibration.
Note: A calibration icon (bottle with bottom por-
tion filled in) shown next to any sensor means it is
due for a full calibration.
To perform span calibration of an individual sensor:
1. At the Calibration Menu, select "Single Sensor
Span."
2. Select a sensor to calibrate from the list.
3. Install the "T" tube and connect it to calibration
gas.
4. Verify that the displayed calibration value meets
the concentration specified on the gas cylinder.
5. Start the flow of calibration gas.
6. Press [Y/+] to start calibrating or wait for
calibration to start automatically.
Single Sensor Bump Test
This menu allows a bump test to be performed on
an individual sensor of your choice.
Note: If a bump test icon (bottle with bottom portion
not filled in) is shown next to any of the sensors, it
means that the sensor is due for a bump test.
To perform a bump test on an individual sensor,
follow these steps:
1. At the Calibration Menu, select "Single Sensor
Bump."
2. Scroll down the list using [N/-], and then press
[Y/+] to select a sensor to bump test.
3. Install the "T" tube and connect it to a source of
calibration gas.
4. Verify that the displayed calibration value meets
the concentration specified on the gas cylinder.
7. A countdown screen appears. You can abort the
calibration at any time during the countdown
by pressing [N/-].
8. If the calibration is not aborted, the display
shows the sensor names and tells you whether
the calibration passed or failed, followed by the
sensor readings.
Note: If the instrument is equipped with a gamma
radiation sensor, the sensor comes pre-calibrated
from the factory and does not require routine
calibration. However, you can check it by placing a
check-source on the rear of the instrument equipped
with a gamma sensor to check the readings. Place
the check-source near the upper middle of the rear
of the instrument and hold it until you see the
Gamma reading change in the display.
5. Start the flow of calibration gas.
6. Press [Y/+] to start calibrating or wait for the
bump test to start automatically.
7. A countdown screen appears. You can abort the
bump test at any time during the countdown by
pressing [N/-].
If the bump test is not aborted, the display shows
the sensor names and tells you whether the bump
test passed or failed, followed by the sensor
readings.
Important!
After each sensor is bump tested, and you press
"OK," the next sensor in the menu list is
highlighted.
LEL Calibration Procedure
You must perform a separate zero calibration for the
LEL sensor and then perform a span calibration.
Important! Before calibrating, make sure pump is on
its high setting. This is in the "Pump Speed" sub-
menu under the "Monitor" menu item.
To calibrate the LEL sensor, follow these two
procedures:
Zero Sensor Calibration For The LEL Sensor
1. Turn on the AreaRAE Plus/Pro and allow it to
warm up for 20 minutes in ambient air.
2. In Programming mode, Select "Calibration" and
then select "Single Sensor Zero."
3. Select "LEL."
4. Calibrate the LEL sensor's zero point with
ambient air.
18.
5. After zero calibration is complete, press
[MODE] to return to the Calibration menu.
"Single Sensor Span" is highlighted
Span Calibration For The LEL Sensor
1. Press [Y/+] to select "Single Sensor Span."
2. Press [N/-] until "LEL Sensor" is highlighted.
3. Press [Y/+] to select "LEL Sensor."
4. Screw one end of a "T" using Teflon tubing to the
AreaRAE Plus/Pro filter on the inlet. (You can use
RAE Systems P/N: W01-3003-000). Attach the
other end to the flow regulator of a calibration cyl-
inder with 50% LEL methane (unless otherwise
specified ). The flow rate should not be less than
750cc/min.
5. Start the flow of calibration gas.
6. Press [Y/+] to start calibration.
7. When calibration is complete, shut off the calibration
gas flow and disconnect the calibration tubing.
8. Press [MODE] to exit to the menu. (You may
perform other calibrations. Otherwise, exit.)
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