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Operation and Maintenance Manual 53
10
Tighten the hose clamp located on the plastic tube and the elbow barb end
of the Chemical Trap.
11 Remove the plastic cap from the inlet end of the Chemical Trap. Taking the
clear end of the vacuum hose and another hose clamp attach the vacuum
hose to the inlet end of the Chemical Trap and tighten the hose clamp.
12 Attach the black end of the vacuum hose to the barb fitting located on the
back of the Detector box and tighten the last hose clamp onto it to make this
connection.
13 Using three or four wraps of Teflon® tape around NPT fitting of the
supplied muffler or user supplied exhaust fitting to the pump's "EXHAUST"
port. Any exhaust tubing attached to the pump exhaust should be
positioned to avoid the accumulation of water from condensation of water
vapor.
14 Place the vacuum pump where it will be located when the pump is
operated, within the length of the power cord to be attached to the female
connector on the back of the Detector.
15 Make sure that the On/Off switch on the pump is in the on position.
Operation Notes (Welch Pump)
1 The pump is designed to start against atmospheric pressure. Therefore, if
the pump is turned off inadvertently, it may be necessary to allow the
Detector pressure to rise before restarting the pump.
2 The only user maintenance required is the periodic replacement of the
piston sleeves and seals, e.g., after 8 months of continuous operation.
Consult the pump’s manual for further details.
3 Although, the pump is not damaged by exposure to ozone, use of the
Chemical Trap is highly recommended. Refer to the pump manual and seal
replacement kit instructions for more detailed information.
4 High line voltage will cause the pump to overheat and trip its thermal fuse.
5 When new, or after changing seals, the pump may require a short break-in
period (2-4 hours).
WARNING
Vent the exhaust from the vacuum pump to a fume hood or other exhaust system to elimi-
nate any potential hazard.