Heath Consultants Hi Flow Sampler - Manual (Page 40)

Calibration Hi Flow

Sampler
40 Instruction 0055-9017
Figure 3-1. Calibration Equipment Setup
3.3 Check Calibration Procedure
This procedure checks the calibration of both the leak-gas sensor and the background-
gas sensor using 2.5% CH4. After setting up the calibration equipment as described in
Section 3.2, proceed to check the instrument’s sensor calibration as follows.
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 for its warm-up period to complete before
proceeding with Step 3.
3. Apply 2.5% CH
4
from the calibration equipment to the instrument’s BACKGROUND
inlet port.
4. From the Main Screen select Menu > Calibration > Verify Calibration to begin the
calibration verification process. Observe that the gas-sampling pump motors should
start.
Wait several minutes for the gas reading to stabilize. At this time the gas
concentration shown on the display should match the concentration stamped on
the calibration gas cylinder.
5. Disconnect the hose from the BACKGROUND inlet port and connect it to the GAS
inlet port.
6. Again wait several minutes for the gas reading to stabilize. At this time the gas
concentration shown on the display should match the concentration stamped on
the calibration gas cylinder.