Thermo Scientific Vanquish VF-D20, Operating Manual, Page: 159 / 182

8 • Troubleshooting
Vanquish Charged Aerosol Detectors Operating Manual Page 159
8.3.2 Resolving Gas Supply Overpressure
CAUTION—Excessive Gas Supply Pressure
An improper or excessive gas supply pressure can lead to an
overpressure in detector that can cause the detector to release gas. This
can pose a health and safety risk.
•
Observe the gas supply pressure range that is specified for the
detector. Do not exceed the maximum gas supply pressure.
• If the overpressure relief valve is releasing gas as a result of an
overpressure in the detector during operation, turn off the detector
immediately. Remedy the situation as described in the
Resolving Gas
Supply Overpressure
section in this manual.
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:
1. Turn off the pump flow and then the gas flow:
a) 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.
b) Turn off the gas flow on the detector.
c) Wait until the system pressure is down to zero before you
continue.
d) Turn off the gas supply to the detector.
2. Check that the gas supply pressure is within the allowed range. See
the
Gas specifications
in section 9.1, page 164 .