Page
13
ML488 | v19
Expo Technologies UK
T: +44 (0) 20 8398 8011
Expo Technologies US
T: +1 (440) 247 5314
Expo Technologies China
T: +86 532 8906 9858
Section 7: Commissioning
Commissioning the System
Note: The steps 10 and 14 to 20 represent detailed commissioning tests
The following equipment is needed for this process:
• Continuity meter
• Gauge manometer (0 to 200 mbarg)
• Differential manometer
• 2 off 4 mm plugs
If, after commissioning, the system does not perform as expected, refer to the Fault Finding Section.
Follow the steps as outlined:
1. Check all connections and that the Relief Valve Unit is fitted correctly with an unobstructed path to the
purge exhaust.
2. Set CLAPS regulator and Purge Flow Regulator to 0.
3. Fully open external supply shut-off valve where fitted.
4. Check that the internal logic pressure gauge reads 2.5 barg / 36 psi / 250 kPag.
5. Check that the pressure gauge on main air supply reads 4.2 barg / 61 psi / 420 kPag.
6. Check that the Pressure Relief Valve is correctly set by isolating the High Pressure Sensor and Purge Outlet
Valve. To do this locate High Pressure / Open Purge Outlet Signal bulkhead. Follow nylon tube back to the
Y pieace connector. Remove tube and plug.
• Remove red plug from the top of the Minimum Pressure Sensor and connect a gauge manometer.
• Raise the internal pressure by turning the CLAPS regulator clockwise till the Low-Pressure Alarm
Indicator turns green. This activates the Purge Flow Regulator.
• Slowly open the Purge Flow Regulator until the Pressure Relief Valve opens. This is the set point.
• This test can be carried out several times to ensure repeatability and compliance.
Refer to the Maintenance of the System section if the Relief Valve needs recalibrating.
7. Reset CLAPS regulator & Purge Flow Regulator to 0.
8. De-isolate the High-Pressure Sensor and Purge Outlet Valve.
9. Connect a differential manometer to the test points on the flow sensor.
10.To check sensor calibration
• Raise the internal pressure by turning the CLAPS regulator clockwise until the Low-Pressure Alarm
Indicator turns green. This will activate the Purge Flow regulator & Purge Outlet Valve. The pressure will
fluctuate as the Purge Outlet Valve opens/closes. This is normal.
• Gradually open the Purge Flow Regulator until System Purging Indicator flashes yellow.
• Gradually close Purge Flow Regulator Valve until the purging indicator stops flashing yellow.
• Take a reading from pressure gauge.
11.To set the purge flow rate:
• Raise the internal pressure by turning the CLAPS regulator clockwise until the Low-Pressure Alarm
Indicator turns green. This will activate the Purge Flow regulator & Purge Outlet Valve. The pressure will
fluctuate as the Purge Outlet Valve opens/closes. This is normal.
• Gradually open the Purge Flow Regulator until System Purging Indicator flashes yellow.
• The flashing yellow indicator confirms the timer has started.
• The differential pressure should be greater than 6.4 mbarg.
