Heath Consultants Hi Flow Sampler - Manual (Page 42)

Calibration Hi Flow

Sampler
42 Instruction 0055-9017
5. Apply the appropriate level of calibration gas from the calibration equipment to the
instrument’s GAS or BACKGROUND inlet port. (In the example above, apply 2.5%
CH
4
to the BACKGROUND port.) Then press the I/O ↵ key to start the calibration
process. Observe that the gas-sampling-pump motors start and the calibration
screen appears.
6. If necessary, use the ∧∨ keys to adjust the Appl(%) reading to match the gas
concentration stamped on the calibration gas cylinder.
7. Wait until the measured gas reading stabilizes, and then press the I/O ↵ key to
calibrate the actual gas reading to that of the applied reading. The message
“Calibration Passed!” will appear at the bottom of the screen if the calibration was
successful. If, however, the calibration was not successful, the message “Calibration
Failed!” will appear. Refer to Section 5 Troubleshooting for possible causes and
remedies for this failure.
8. Disconnect the gas hose, and then wait until the measured gas reading falls to zero
percent.
9. Press the ESC key to return to the Calibration Menu Screen.
10. Repeat this procedure as necessary to calibrate both sensors at 2.5% and 100% CH
4
.