Specifications

Intrinsically Safe TCD Detector Personality Module (ISTCD DPM)
Output signals from Thermal Conductivity Detector (TCD) in the Modular
Oven are input to the associated Detector Personality Module (DPM).
The DPM is mounted inside the Electronics Enclosure (EC) on the floor
of the compartment. The DPM digitizes the incoming analog data and
then passes it to the CIM via an I
2
C port. The resulting data is then
processed by the Embedded SNE software in the CIM. Resulting data
can then be viewed on the CIM Display or the workstation. Refer to
Figure 2-12.
Description
The ISTCD DPM is an enclosed unit that is not field repairable. Opening
the black case may violate the safety protection of the device. Service is
limited to replacement of the entire DPM.
Figure 2-12: ISTCD DPM
The TCD DPM in the Maxum II, as well as the actual detector controlled
by the TCD, is protected by intrinsic safety. Intrinsic safety is a method of
protection where a circuit is designed such that it will not create a spark
or other condition capable of causing ignition of flammable vapors or
gases, even under fault conditions. Various circuits in the Maxum
analyzer utilize this form of protection, including the IS-TCD.
Intrinsic Safety
To preserve the intrinsically safe design protection of the ISTCD, certain
measures are required. Failure to adhere to all requirements for use of
the ISTCD in the Maxum II could violate the safety protections of the
analyzer. 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.
CAUTION
2-20 A5E31405710001