Ametek ASR900, Installation And Maintenance Manual

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Maintenance | 4-15
Replacing Probe Heater Parts – Extended
Maintenance
This section describes Extended (Advanced) Maintenance, which is
required only in the event of failure of one of the Heater components
(Over-Temperature Switch, Heater Cartridge, or RTD). Replace the faulty
component(s) as required.
Carefully read and understand all of the instructions before begin-
ning disassembly and reassembly. The instructions are described in
a sequence that will ensure the proper removal and replacement of
all parts that make up the entire Heater Assembly. The instructions
also include special Notes, Cautions, and Warnings to consider while
working on the Heater Assembly.
IMPORTANT
If the Heater Assembly cover is removed for the purpose of replacing
internal electrical parts or wires,
always replace the internal o-ring
(P/N 300-8721).
Be sure to have the required parts (Over-Temperature Switch, Heater
Cartridge, and/or RTD) on-site prior to disassembling the Probe
Heater.
ORDER THE O-RING AT THE SAME TIME YOU
ORDER ALL OTHER PARTS.
While the Heater Assembly is removed for maintenance, take extreme
care to avoid scratching or damaging the joining surfaces (flamepath)
of the Heater Assembly and its cover, and the joining surfaces (heat
transfer) of the Heater Assembly and the HAG Probe. Also, take are to
avoid damaging the o-ring groove.
Gently clean these areas with a non-abrasive cloth.
If the Thermal Insulation Tube is removed, take extreme care to avoid
damaging its threads and the threads in the Heater Block, and the
Junction Box and its cover. After removing these parts, cover the
threaded ends to avoid damaging them. Clean, defect-free threads are
essential to ensure a flame-proof connection.

NOTE

NOTE
!
WARNING
!
CAUTION

See Chapter 5 for
extended maintenance spare
parts ordering numbers.