Specifications

Intrinsically Safe Thermal Conductivity Detector (ISTCD DPM)
This section provides removal and installation procedure for the
Intrinsically Safe Thermal Conductivity Detector (ISTCD) Detector
Personality Module (DPM). This board is mounted on the floor of the
electronics enclosure in the center of the enclosure.
Description
Voltage dangerous to life exists. Before performing the removal and
installation procedures, it is important that primary AC power to the
Maxum II be turned off from the main circuit breaker. Observe all
plant safety requirements before performing any repair or
maintenance on the Maxum II.
WARNING
The ISTCD DPM contains intrinsically safe circuitry. The ground to
the board must remain connected while the board is in operation. In
addition, the board is sealed in black casing that must not be
opened. The board cannot be serviced on site. It must be returned
to the factory for service. Maintenance is limited only to
replacement. Failure to follow these instructions will violate the
safety protection of the device. Refer to the Maxum II Explosion
Protection Safety Standards Manual (A5E02220442001) for more
information on the safe use of intrinsically safe circuitry in the
Maxum II.
WARNING
The following procedure should be followed for removal and installation
of ISTCD DPM.
Procedure
Step Procedure
1. Turn off power to the Maxum II at the main circuit breaker.
2. Open electronic enclosure door (using a 4mm (5/32”) Allen
wrench if necessary).
3. Note the plug in location for each of the oven cables running
to the DPM. Then, disconnect the cables as well as the I
2
C
cable (white connector).
4. Use a 2.5 MM Allen wrench to disconnect the screw for the
ground wire. Note that the ground wire screw is equipped
with a metal standoff
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