Heath Consultants Hi Flow Sampler - Manual (Page 41)

Hi Flow

Sampler Calibration
Instruction 0055-9017 41
7. Disconnect the hose from the GAS port, and then allow the pumps to run until both
the Back and Leak readings fall to zero percent.
8. Press the ESC key three times to return to the Main Screen.
Note:
If gas is still present in either sensor chamber when ESC is pressed, the
instrument will automatically begin to purge the sensors until all gas is removed from
the instrument.
3.4 Gas Calibration Procedure
This procedure calibrates both the leak-gas sensor and the background-gas sensor at
2.5% and 100% CH
4
. After setting up the calibration equipment as described in Section
3.2, proceed to calibrate the sensors as follows.
NOTE: The Hi Flow
 Sampler can be calibrated on the low end with a mixture of
methane between 0.75 - 2.75 for catalytic and 95-100% methane on the thermal
conductivity side.
1. Before turning ON the instrument, be sure that the calibration equipment is not
connected to the instrument’s GAS or BACKGROUND inlet port, and that the
instrument is in an area of clean air.
2. Turn ON the instrument and wait its warm-up period to complete before
proceeding to Step 3.
3. From the Main Screen select Menu > Calibration > Calibrate Sensors to display the
Sensor Calibration Screen.
4. Using the ∧∨ keys, highlight the sensor to be calibrated along with its gas level. (In
the example above, the background sensor will be calibrated using 2.5% CH
4
.)