Thermo Scientific VH-D20 Operating Manual page 122

7 • Maintenance and Service
Page 122
CAUTION—Hot Surfaces
Surfaces inside the device may become hot during operation. Touching
hot parts might cause burns.
Allow hot surfaces to cool down before starting replacement or
maintenance procedures.
CAUTION—Hydrostatic Pressure
Solvent may spill when you open the flow path. This is due to hydrostatic
pressure in the system when the solvent reservoirs are located above
the pump outlet. Before you loosen a connection in the flow path:
• Turn off the pump flow and wait until the system pressure is down
to zero.
• Unscrew the caps of the solvent reservoirs and remove the solvent
lines together with the caps from the reservoirs.
• Empty the solvent lines. Refer to the Operating Manual for the
pump.
• Retighten the reservoir caps.
CAUTION—Electric Shock or Damage to the Device
After the power to the device is turned off, the device is still energized
as long as the power cord is connected. Repair work on the device while
the device is connected to power could lead to personal injury.
• Always unplug the power cord before starting repair work inside the
device.
• If you were instructed to remove any housing covers or panels, do
not connect the power cord to the device while the cover or panels
are removed.
NOTICE—Detector Gas Flow and Pump Flow
Improper handling of detector gas flow and pump flow start and stop
can damage the detector. Observe the respective order of steps:
• 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.
Charged Aerosol Detectors (VH-D20, VF-D20)
Operating Manual