PROMET EExd Process Moisture Analyzer Sampling Systems
Installation, Operation & Maintenance Manual
and User
Guide
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11
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www.michell.com
2.1 Gas Connections
Note: Ensure that the process sample gas supply line is well flushed through to clear
any liquids and debris present prior to connection to the Sampling System.
Connections are as follows:
1. Sample Gas Inlet -
6mm/ ¼” OD
Swagelok tube fitting.
(standard – 69 barg (1000 psig) maximum pressure
or high pressure – 138 barg (2000 psig)
maximum.)
2. Sample Gas Outlet -
6mm/ ¼” OD
Swagelok tube fitting.
(Vent to atmosphere/low pressure flare. 7 barg
(100 psig) maximum back pressure).
3. Letdown Gas Vent-
6mm/ ¼” OD
Swagelok tube fitting.
(Vent to atmosphere.)
2.2 Power Supply Connection
A single-phase ac mains power supply is required to operate the heater circuit and
analyzer within the sampling systems.
The factory set power supply voltage is indicated on a yellow label located on the rear
panel. The user cannot change the specified power supply voltage.
Cable entry into the sampling system enclosures is through a Ø20 mm clearance hole
located in the base of the enclosure. A suitably sized cable gland should be used and if
armoured cable is used then this should be terminated at this point. Cable entry into
the sampling system panel mounted versions is directly into the „POWER CIRCUITS‟
junction box.
Connections are made onto terminals within the „POWER CIRCUITS‟ junction box. Cable
entry into the junction box is provided through an ISO M20 thread or EExe plastic cable
gland.
1 Channel version terminals are marked:
1
Live
4
Neutral
E
Earth
2 Channel version terminals are marked:
1
Live
5
Neutral
E
Earth
Note:
An M8 earth stud is provided in the base of the enclosures. This must be used to
earth the sampling systems. For panel mounted versions earthing connections should
be made directly to the Earth Busbar
.
