Heath Consultants Hi Flow Sampler - Manual (Page 31)

Hi Flow

Sampler Operation
Instruction 0055-9017 31
2.18 Making a Leak Rate Measurement
Before making a leak rate measurement, the user must decide whether to use . . .
• the Basic or Expanded Menu Mode (Section 2.8)
• lpm or cfm for the flow rate (Section 2.12)
• the Automatic 2-Stage, Manual 2-Stage, or Manual 1-Stage
method of making a measurement when operating in the
Expanded Menu Mode (Section 2.14)
• a Test ID when operating in the Expanded Menu Mode (Section 2.17)
2.18.1 Leak Rate Measurement – Basic Menu Mode
While operating in the Basic Menu Mode, the user starts a measurement at a high flow
rate and then waits for a stable leak rate reading to occur. During this time the flow rate
can be changed using the Speed function on the Main Screen. This mode is used when
more control of the leak rate measurement process is required, and when saving data is
not desired.
1. If not already done, place the instrument into its Basic Menu Mode per
Section 2.8 Selecting the Basic or Expanded Menu 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. Select Start from the Main Screen.
5. Begin measuring until a stable leak measurement is achieved—this may take several
minutes.
If desired, the flow rate can be manually controlled by using the Speed function.
Each press of the I/O ↵ key will lower the flow rate as indicated by the speed bar
moving to the left.