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10.4.2. QRAE 3 Diffusion Model

Because there is no single inlet on the diffusion (non-pumped) version of the QRAE 3, a

Calibration Adapter (calibration cap for diffusion models: P/N M02-3009-000; calibration tube

for diffusion models: P/N M03-3010-000) is used for supplying calibration gas to all sensors at

one time. Follow these steps for attaching the Calibration Adapter:

1. Align the Calibration Adapter’s main body with the indented area around the QRAE 3’s

gas inlets.

2. Turn the knob clockwise to secure the Calibration Adapter to the instrument.

3. Connect the hose to the Calibration Adapter and to its gas source.

4. Make sure the Calibration Adapter is securely attached before starting the flow of

calibration gas. (The Calibration Adapter has small grooves on its underside to allow gas to

escape after passing over the sensors.)

Calibration

Adapter

Hose to

Calibration

Gas Source

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