CAUTION
Excessive Gas Supply Pressure
An improper or excessive gas supply pressure can lead to an overpressure in the detector that can cause the safety valve in the detector to release gas. In extreme cases, the excessive pressure can cause the gas filters to rupture. This can pose a health and safety risk.
When
The gas supply pressure has exceeded 620 kPa (6.2 bar, 90 psi). The detector cannot pressurize properly.
The overpressure relief valve on the gas inlet inside the detector will open and release gas pressure to prevent damage to the detector. This creates a loud hissing sound.
Follow these steps
To remedy the situation, follow these steps:
Turn off the pump flow and then the gas flow:
- Turn off the pump flow to the detector. Wait at least 5 minutes. During the waiting period, the detector drains any remaining mobile phase to waste.
- Turn off the gas flow on the detector.
- Wait until the system pressure is down to zero before you continue.
- Turn off the gas supply to the detector.
Check that the gas supply pressure is within the allowed range. For the allowed range, see Performance Specifications.
On the gas supply, turn on the gas flow to the detector. Follow the instructions depending on the situation:
Situation | Steps |
---|---|
The gas supply pressure has fallen within the allowed range. The overpressure relief valve will remain closed. |
|
The overpressure relief valve is still open and releasing gas while the gas flow in the detector is turned off | If the problem persists, contact Thermo Fisher Scientific Technical Support for assistance. |