QRAE II User Guide
Page 47
6.2
Connecting The Calibration Adapter (Diffusion
Model Only)
The QRAE II is a diffusion monitor and must be calibrated using a fixed-flow regulator
with a flow rate between 0.5 and 1.0 liters per minute. The QRAE II is supplied with a
special calibration adapter that covers the gas diffusion ports.
1.
Place the Calibration Adapter over the filter area on the front of the QRAE II.
2.
Finger-tighten the screw at the center, as shown:
Note:
Finger-tighten this only. Do not use pliers or other tools. The Calibration
Adapter should be snug, but an air-tight seal is unnecessary.
3.
Attach the hose from the regulator/calibration gas cylinder to the Calibration
Adapter’s inlet.
Caution!
After calibration is complete, remove the Calibration Adapter. When
monitoring, never operate the QRAE II with the Calibration Adapter attached. The
QRAE II’s sensors operate by diffusion. If the Calibration Adapter is attached during
normal operation, inconsistent and lower-than-normal readings will occur because of
decreased concentration of the gas being monitored.
