MAX300-RTG : Hardware Manual Hardware Maintenance
62
flange and plug its heater into the connector on the chamber support. Slide the
VacTrac back into the enclosure and engage and lock the latch on the left side.
Thread the sampling end of the inlet through the fitting on the enclosure wall.
Tighten the ¼ inch nut (9/16 hex) that secures the transfer line to the enclosure
wall. Carefully insert the end of the transfer line into the sampling tee fitting until it
stops and tighten the ¼ inch nut (9/16 hex) that secures it in place.
Sample Stream Rotary Inlet Valves
Sample introduction into the enclosure is performed by rotary valves. During the
life of the rotary valve, a few common problems that may arise.
No flow
A pressure of 5 PSIG above atmospheric pressure is usually sufficient to
establish flow. Sampling sub atmospheric streams requires special
techniques. If the sample line is not at sufficient pressure, the instrument
will not register a flow.
Each inlet to the rotary valve is equipped with a filter. If it becomes clogged,
it can be temporarily removed to troubleshoot the no flow condition. Do not
operate continuously without a filter. Any particulates present in the sample
will shorten the valve’s life.
If the actuator loses proper alignment with the valve body, it may resemble
a blocked valve.
Valve will not rotate
May result from an improperly connected valve actuator, either the DC
power cord or the Serial COM cable (three pin push on connector) that
commands the actuator
A faulty valve actuator
A valve rotor that has seized
Valve selects the wrong stream
Indicates a problem with valve alignment. Refer to the Multiposition Electric
Actuator Instruction manual for the procedure to align the valve
A badly scored rotor will allow "cross talk" between adjacent streams
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