Thermo Scientific VH-D20 Operating Manual page 88

6 • Operation
Page 88
NOTICE
Pay attention also to the following guidelines:
• If there is evidence of leakage in the device, turn off the pump flow
while leaving the gas flow on and remedy the situation immediately.
• Pump flow without gas flow causes detector flooding.
Verify that the detector gas flow is always turned on before you turn
on the pump flow to the detector. Do not direct pump flow to the
detector without gas flow being turned on.
• Turn on the gas supply and detector gas flow only when the
nebulizer is installed, the components in the gas flow path are
properly connected, and the protective cover of the gas filter
assembly is installed.
• To start detector gas flow and pump flow: Turn on the detector gas
flow first, wait at least 5 minutes and only then turn on the pump
flow.
• To stop pump flow and detector gas flow: Turn off the pump flow
first, wait at least 5 minutes and only then turn off the detector gas
flow. During the waiting period, the drain pump drains any
remaining mobile phase to waste.
• Exceeding the pump flow rate limit will damage the detector.
Operate the detector only within the allowed pump flow rate range
(see Performance Specifications
• If the overpressure relief valve is releasing gas as a result of an
overpressure in the detector during operation, turn off the detector
and the gas supply to the detector immediately. Remedy the
situation as described in
(} page 164).
• Observe the requirements for gas supply and ventilation. See
Ventilation Requirements (} page 51)
(} page 52).
• Contamination of the mobile phase can damage the detector. Avoid
contamination of the mobile phase. See
the Detector (} page 96).
• Observe the specifications for operation. See
Specifications (} page 170).
(} page 170)).
Resolving Gas Supply Overpressure
and Gas Supply Requirements
Mobile Phase Guidelines for
Performance
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual