PROMET EExd Process Moisture Analyzer Sampling Systems
Installation, Operation & Maintenance Manual
and User
Guide
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15
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www.michell.com
3.1
Start-Up Procedure
1.
Close the Letdown Gas Vent Isolation Valve (BV3 for 1 channel and BV6 for 2
channel).
2.
Open the Gas Outlet Isolation Valve (BV2 for 1 channel and BV5 for 2 channel).
3.
Open the Gas Inlet Isolation Valve (BV1 for 1 channel and BV4 for 2 channel).
4.
Fully open the Sample Flow Letdown Pressure Regulator (PR1 for 1 channel and
PR5 for 2 channel) and if the high pressure option is fitted then also fully open the
Letdown Pressure Regulator (PR2 for 1 channel and PR6 for 2 channel).
5.
Adjust the Sample Flowmeter & Valve (FM1 for 1 channel and FM3 for 2 channel)
to indicate a gas flowrate of approximately 0.2 m
3
/h (3.3 L/min).
6.
For Natural Gas systems only! Fully open the Bypass Flow Letdown Pressure
Regulator (PR3 for 1 channel and PR7 for 2 channel) and if the high pressure
option is fitted then fully open the Letdown Pressure Regulator (PR4 for 1 channel
and PR8 for 2 channel).
7.
For Natural Gas systems only! Adjust the Bypass Flowmeter & Valve (FM2 for 1
channel and FM4 for 2 channel) to indicate a gas flowrate of approximately 0.36
m
3
/h (6 L/min).
8.
Switch on the power to the PROMET EExd Process Moisture Analyzer using the
PROMET EExd Power Isolator switch located on the „Power Circuits‟ junction box.
9.
Close the enclosure door and allow the temperature to stabilise for at least one
hour before monitoring a measurement.
3.2 Shut-Down Procedure
Note:
There is a mandatory de-energisation time period of 45 minutes stipulated in
the certification of the PROMET EExd product. This special condition must be
fully carried out prior to removing the cover of the PROMET EExd flameproof
enclosure.
Proceed as follows:
1.
Isolate the sampling system from the process sample gas supply line by CLOSING
the Gas Inlet Isolation Valves (BV1 for 1 channel and BV4 for 2 channel).
2.
Allow a short period of time (say 3 minutes) for the sampling system to
vent/depressurise.
3.
Isolate the sampling system from the gas vent/flare line by CLOSING the Gas
Outlet Isolation Valve (BV2 for 1 channel and BV5 for 2 channel).
4.
Fully depressurise the sampling system by OPENING the Gas Letdown Vent
Isolation Valve (BV3 for 1 channel and BV6 for 2 channel).
