Purpose

The purpose of this leak test is to check for leaks in the tubing line, from the sampling input line to the gas detector installed on the HGS-100 & 200 gas detection panel.

Test Procedure

The leak test is divided into input line and output line, with reference to the pump.

1. Leak Test of Manifold Block for Each Sampling Channel

• Close the sampling lines.
• Connect a pneumatic pressure gauge to the manifold block of the panel.
• Apply 1 bar pressure and observe the pressure change in the calibrator for 2 minutes.

2. Leak Test from Pump Inlet to Each Sampling Channel

• Close the sampling lines.
• Connect a pneumatic pressure gauge to the gas calibration valve (V3) of the panel.
• Apply 1 bar pressure and check for pressure changes over 2 minutes.

3. Leak Test from Pump Output to Gas Detector

• Block the exhaust line.
• Connect a pneumatic pressure calibrator to the gas calibration valve (V4) of the panel.
• Apply 1 bar pressure and observe the pressure change for 2 minutes.

4. Leak Test of Sampling Line to Pump Input

• Select the sampling channel to be tested.
• Check for flow fault alarms by blocking the entrance of the sampling line while the panel pump is operating normally.
• If a leak is present, air will be sucked into the leaked area, and the flow fault alarm will not activate.
• Determine the presence of leaks through observed pressure changes.

Test Pressure Guidelines

• The leak test reference pressure should be set to 1 bar for the following reasons:
  • The operating pressure range of the gas detector cell is 800 - 1200 mbar.
  • Excessive pressure may cause damage and is not covered under HANLA IMS.