1. Turn on your AreaRAE Plus/Pro by pressing and holding [MODE] (the middle button) and
allow the instrument to boot up fully until the main measurement screen with sensor
names and readings is shown.
2. Enter the Bump Test menu. It is accessible through Programming Menu.
3. Connect the AreaRAE Plus/Pro to the calibration gas. Turn on the gas to initiate flow.
4. Press [Y/+] to start the bump test. While the bump test is being performed, the readings
for each sensor are shown. Once the bump test completes, pass/fail test results and
readings are shown for each sensor.
Note: If a PID or other sensors are installed in the instrument require a dedicated cylinder
of gas to calibrate, the instrument will prompt for calibrating such sensors at this point.
IMPORTANT!
If one or more sensors fails a bump test, be sure to calibrate those sensors.
5. The bump test is now complete. Press Exit to return to the main measurement screen.
6. Now perform a manual alarms test (see See "Manual Alarms Test" on the previous page
for more information.).
If all the alarms and all sensors have passed and no sensor is due for a calibration, the
instrument is now ready for use.
Note: When a manual bump test is performed, the readings shown are in the equivalent units of
the calibration gas, and not the measurement gas (if different).
Bias & Equilibration for Liquid O
2
and other Biased Sensors
Some electrochemical sensors (NO, NH
3
, Liquid O
2
) require a bias voltage to detect the gas,
while most do not. Unbiased sensors may be shipped with a shorting pin across the electrodes
to avoid an accidental bias. The pin should be removed before installation. Biased sensors
require an equilibration time (also known as warm-up time) of at least 6 hours, and sometimes
more, after installation for the baseline to become stable enough to calibrate the sensor.
Unbiased sensors require at least 10 minutes to stabilize. Once installed, any sensor bias stays
on, even when the meter is off. Therefore, even biased sensors are ready for immediate use when
the instrument is turned on again, and the equilibration time is needed only when first installed
or if the battery becomes completely drained. The SensorRAE 4R+ can be used to maintain bias
on NO and other biased sensors, so long equilibration times can be avoided when installing such
sensors into a multi-gas instrument.
CAUTION
If an instrument is calibrated directly after sensor installation (no equilibration time, no use of
SensorRAE 4R+), readings will be seen to decrease until the sensor’s bias is stable. Also, this may
trigger a low alarm, even if calibration passes.
AreaRAE 89 User Manual
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