Heath Consultants Hi Flow Sampler - Manual (Page 32)

Operation Hi Flow

Sampler
32 Instruction 0055-9017
6. In the example below, the current flow rate is 216.5 lpm, the background gas
concentration is 0.8%, the leak concentration is 15% gas, and the calculated leak
rate is 42.5 lpm.
7. The measurement process continues until Stop is selected.
2.18.2 Leak Rate Measurement – Automatic 2-Stage Mode
Note:
The Automatic 2-Stage Mode can only be selected if operating in the Expanded
Menu Mode. Refer to Section 2.8.
1. If not already done, place the instrument into its Automatic 2-Stage measurement
mode (denoted by the letter (A) appearing at the bottom of the screen). Refer to
Section 2.14.1 Automatic 2-Stage Measurement Mode.
2. Choose an attachment that will ensure the complete capture of the gas leak.
Connect this attachment to the end of the Hi Flow  Sampler’s main sampling hose
and position the attachment’s inlet over the leak source.
3. Position the inlet of the instrument’s background gas sampling hose opposite the
leak source, such that the leak source will not contribute to the background
measurement.
4. Begin the measurement process by selecting Start from the Main Screen.