PROGRAMMING & CALIBRATION
3-3
press
[MODE]
to move to the next digit or sensor, and hold
down
[MODE]
to exit and save any changes.
3.2. Calibration
WARNING!
The calibration of all newly purchased RAE Systems
instruments should be tested by exposing the sensor(s) to
known concentration calibration gas(es) before the
instrument is put into service the first time.
For maximum safety, the accuracy of the QRAE PLUS
should be checked by exposing the sensor(s) to known
concentration calibration gas(es) before each day’s use.
Pumped Instruments
Pumped monitors are preferably calibrated with gas at atmospheric pressure,
such as with flowing gas in an open or “Tee”, or from a Tedlar gas bag.
Alternately, to save gas, connect the monitor directly to the gas bottle using a
demand-flow regulator. Direct connection to a cylinder with fixed-flow regulator at
0.5 - 1.0 liters per minute is less accurate than the other methods by a few
percent.
Figure 5. Calibration Connection
Calibration Cup
Gas Cylinder
Q-RAE PLUS
Probe with Filter
(Insert as far as
possible)
Regulator
