PROMET EExd
Process Moisture Analyzer Sampling
Installation, Operation &
Maintenance Manual
97095 Issue 03, August 2009
Systems
© 2006 Michell Instruments Ltd
Thank you for choosing your Michell
Instruments dew-point instrument
from The Dew Point Specialists. All
Michell‟s products are designed and
manufactured to meet Michell‟s
rigorous specifications and worldclass quality standards. During
development, our laboratory testing
team took your instrument through
a rigorous testing process to ensure
that it will deliver outstanding
performance time and time again.
We are confident that the dew-point
instrument you have purchased
from Michell Instruments will meet
your own exacting standards.
Michell Instruments Ltd,
HQ
Lancaster Way Business
Park
Ely, Cambridgeshire
CB6 3NW
United Kingdom
Tel: +44 (0)1353 658000
Welcome
© 2006 Michell Instruments Ltd
CONTENTS
CONTENTS ............................................................................................................................................................... 3
1. OVERVIEW .......................................................................................................................................................... 4
1.1 Manufacturing Quality .............................................................................................................................. 8
2. INSTALLATION ................................................................................................................................................... 9
2.1 Gas Connections ...................................................................................................................................... 11
2.2 Power Supply Connection ...................................................................................................................... 11
2.3 Output Wiring Connections .................................................................................................................... 12
3. OPERATION ...................................................................................................................................................... 14
3.1 Start-Up Procedure ................................................................................................................................. 15
3.2 Shut-Down Procedure ............................................................................................................................ 15
4. OPTIONS ........................................................................................................................................................... 16
4.1 Enclosure Heater Temperature Control ............................................................................................... 16
4.2 Trace Heated Sample Line ..................................................................................................................... 17
4.3 Enclosure Cooling .................................................................................................................................... 17
5. MAINTENANCE ................................................................................................................................................. 18
5.1 Membrane Filter Element Replacement ............................................................................................... 18
5.2 Glycol Absorption Cartridge Replacement ........................................................................................... 18
5.3 Particulate Filter Element Replacement ............................................................................................... 19
6. TECHNICAL SPECIFICATION .......................................................................................................................... 21
APPENDIX A CONTACT DETAILS .................................................................................................................... 22
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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1. OVERVIEW
The PROMET EExd Sampling Systems are designed for continuous on-line measurement
and monitoring of the moisture content of a hydrocarbon gas. The sampling systems can
be located close to the process gas sample take-off point in a potentially explosive
environment designated zone 1 hazardous area.
PROMET Process Moisture Analyzer Sampling Systems are specifically designed for the
measurement of moisture content in Natural Gas. The systems are configured with the
necessary filtration, pressure letdown and flow control required for measurements at
pressure before finally venting to an atmospheric or a low pressure flare line system. A
fast-loop bypass flow arrangement is included to reduce sample flow response time lag
and enabling the filter to be drained automatically of any potential hydrocarbon liquids
and hydrates formed.
Two separate series of sampling systems are available; one designed for the
requirements of Trace Moisture applications such as molecular sieve drying at LPG
plants and one for the more general moisture measurements in Natural Gas from
processing through pipeline transmission. Each of these systems can also be supplied
as either 1 or 2 channel systems. The more general Natural Gas systems are supplied
with triple filtration consisting of particulate and membrane filter and glycol absorption.
For systems intended to measure Trace Moisture levels, single filtration is provided that
consists of a stainless steel mesh particulate filter.
The sampling systems gas handling components are supplied mounted on a chassis
panel that can be fitted within a stainless steel insulated enclosure. The enclosure
provides environmental protection to IP66 and fitted with mounting brackets suitable
for wall mounting.
Sampling systems fitted within enclosures are temperature controlled to maintain a
constant temperature environment of at least 10 oC above the highest envisaged dew
point temperature independent of surrounding temperature variations. The temperature
control system consists of a heater controlled by a fixed preset thermostat to provide
internal ambient air temperature control of >15 oC. For higher temperature control,
systems can be supplied with a heater controlled by an adjustable setpoint thermostat
to achieve internal ambient air temperature control up to 60 oC for maintaining more
stable measurement conditions for installations in adverse climates.
All sample gas wetted metallic parts in AISI 316L stainless steel with Viton soft parts
that comply with the NACE standard MR-01-75 (latest edition). Tube fittings are twin
ferrule compression type. All gas and cable entries are located in the base of the
enclosure.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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Sampling systems can be supplied in various configurations/options:
Indoor (chassis panel mounted)
Outdoor (304/316 stainless steel enclosure)
1 or 2 channels
Standard operating pressure (69 barg (1000 psig))
High operating pressure (138 barg, (2000 psig))
Enclosure heating (fixed/adjustable control)
Enclosure cooling (adjustable control)
Trace heated sample line
Sample System gas handling components comprise of the following:
Gas Inlet Isolation Valve(s)
(BV1 for 1 channel):
(BV4 for 2 channel): Allows user to manually isolate the system from
the process sample gas supply line for
maintenance or servicing.
Filter(s)
Natural Gas systems
(F1 for 1 channel):
(F4 for 2 channel): Provides protection from contamination of
particulate matter down to 60 microns using a
stainless steel sinter filtration.
Natural Gas systems
(F1 for 1 channel):
(F5 for 2 channel): Provides protection from contamination of
liquid carry-over of hydrocarbon mist particles
using membrane filtration.
Natural Gas systems
(F3 for 1 channel):
(F6 for 2 channel): Provides protection from contamination of
glycol vapour using a “Glysorb” ™ absorption
cartridge.
Trace Moisture systems
(F1 for 1 channel):
(F2 for 2 channel): Provides protection from contamination of
particulate matter down to 5 microns using a
stainless steel mesh filtration.
Line Pressure Gauge(s)
(PG1 for 1 channel):
(PG2 for 2 channel): Indicates the sample gas line pressure.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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Process Moisture Analyzer:
(PROMET EExd): Provides measurement and output of moisture
content of the sample gas (1 or 2 channels).
Sample Flow Letdown
Pressure Regulator(s)
Natural Gas systems
(PR1/PR2 for 1 channel):
(PR5/PR6 for 2 channel): Provides pressure letdown from line pressure to
a lower vent pressure. Standard version has 1
stage of pressure letdown. High pressure
version has 2 stages of pressure letdown.
Trace Moisture systems
(PR1/PR2 for 1 channel):
(PR3/PR4 for 2 channel): Provides pressure letdown from line pressure to
a lower vent pressure. Standard version has 1
stage of pressure letdown. High pressure
version has 2 stages of pressure letdown.
Non Return Valve(s)
Natural Gas systems
(NRV1 for 1 channel):
(NRV3 for 2 channel): Provides protection for the system from
backpressure of vent gas when sample gas is
not flowing.
Trace Moisture systems
(NRV1 for 1 channel):
(NRV2 for 2 channel): Provides protection for the system from
backpressure of vent gas when sample gas is
not flowing.
Sample Flowmeter & Valve(s)
Natural Gas systems
(FM1 for 1 channel):
(FM3 for 2 channel): Allows the user to manually set and indicate
the sample gas flowrate across the moisture
analyzer dew point sensor.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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Trace Moisture systems
(FM1 for 1 channel):
(FM2 for 2 channel): Allows the user to manually set and indicate
the sample gas flowrate across the moisture
analyzer dew point sensor.
Gas Outlet Isolation Valve(s)
(BV2 for 1 channel):
(BV5 for 2 channel): Allows the user to manually isolate the system
from the gas vent line for maintenance or
servicing.
Gas Letdown Vent Isolation Valve(s)
(BV3 for 1 channel):
(BV6 for 2 channel): Allows the user to manually letdown any
sample gas pressure within the system
(depressurise to atmosphere) for maintenance
or servicing.
Bypass flow gas handling components (Natural Gas systems only) comprise of the
following:
Bypass Flow Letdown
Pressure Regulator(s)
(PR3/PR4 for 1 channel):
(PR7/PR8 for 2 channel): Provides pressure letdown from line pressure to
a lower vent pressure. Standard version has 1
stage of pressure letdown. High pressure
version has 2 stages of pressure letdown.
Non Return Valve(s)
(NRV2 for 1 channel):
(NRV4 for 2 channel): Provides protection for the system from
backpressure of vent gas when sample gas is
not flowing.
Bypass Flowmeter & Valve(s)
(FM2 for 1 channel):
(FM4 for 2 channel): Allows the user to manually set and indicate
the bypass gas flowrate across the membrane
filter.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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1.1 Manufacturing Quality
Your sampling system should reach you in perfect working condition. Michell
Instruments are registered with the British Standards Institute for Quality Assurance to
BS EN ISO 9001: 2000.
We have rigorous procedures at every stage of production to ensure that the materials
of construction, manufacturing, calibration and final test procedures meet the
requirements laid down by our Quality System which is approved by BSI.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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2. INSTALLATION
Sampling Systems are assembled onto a panel for indoor installations or in a stainless
steel enclosure for outdoor installations. All are suitable for wall mounting.
When an outdoor system is supplied the internal insulation and temperature control
circuits allow the sampling system to be positioned outside at a point as close to the
sample gas take-off point as possible so minimising sample line response time lag in a
designated zone 1 hazardous area.
The enclosures provide environmental ingress protection to IP66 and should be
mounted vertically and free of any appreciable vibration in a permanently shaded
position to prevent heating effects through sun radiation.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
M8 MOUNTING
HOLES
735
695
715
770
1 CHANNEL PANEL
3mm DOUBLE
BIT LOCKS
1 CHANNEL ENCLOSURE
M10 MOUNTING
HOLES
760
800
850
800
M8 MOUNTING
HOLES
919
869
894
963
2 CHANNEL PANEL
3mm DOUBLE
BIT LOCKS
2 CHANNEL ENCLOSURE
M10 MOUNTING
HOLES
950
1000
1050
1000
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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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.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
Terminal No.
Output
1
Channel 1 Process Alarm Relay NC
2
Channel 1 Process Alarm Relay COM
3
Channel 1 Process Alarm Relay NO
4
Channel 1 Analyzer Status Alarm Relay NC
5
Channel 1 Analyzer Status Alarm Relay COM
6
Channel 1 Analyzer Status Alarm Relay NO
7
Not Used
8
Not Used
9
Not Used
10
Not Used
11
Not Used
12
Not Used
13
MODBUS digital Comms B
14
MODBUS digital Comms A
15
MODBUS digital Comms Earth
16
Channel 1 Moisture measurement current +mA
17
Channel 1 Moisture measurement current -mA
18
Channel 1 Pressure measurement current +mA
19
Channel 1 Pressure measurement current -mA
20
Not Used
21
Not Used
22
Not Used
23
Not Used
E
Screen
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2.3 Output Wiring Connections
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 „OUTPUTS‟ junction
box.
Connections are made onto terminals within the „OUTPUTS‟ junction box. Cable entry
into the junction box is provided through an ISO M20 thread or EExe plastic cable
gland.
1 Channel Version wiring connections are as follows:
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
Terminal No.
Output
1
Channel 1 Process Alarm Relay NC
2
Channel 1 Process Alarm Relay COM
3
Channel 1 Process Alarm Relay NO
4
Channel 1 Analyzer Status Alarm Relay NC
5
Channel 1 Analyzer Status Alarm Relay COM
6
Channel 1 Analyzer Status Alarm Relay NO
7
Channel 2 Process Alarm Relay NC
8
Channel 2 Process Alarm Relay COM
9
Channel 2 Process Alarm Relay NO
10
Channel 2 Analyzer Status Alarm Relay NC
11
Channel 2 Analyzer Status Alarm Relay COM
12
Channel 2 Analyzer Status Alarm Relay NO
13
MODBUS digital Comms B
14
MODBUS digital Comms A
15
MODBUS digital Comms Earth
16
Channel 1 Moisture measurement current +mA
17
Channel 1 Moisture measurement current -mA
18
Channel 1 Pressure measurement current +mA
19
Channel 1 Pressure measurement current -mA
20
Channel 2 Moisture measurement current +mA
21
Channel 2 Moisture measurement current -mA
22
Channel 2 Pressure measurement current +mA
23
Channel 2 Pressure measurement current -mA
E
Screen
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2 Channel Version wiring connections are as follows:
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
Minimum Cable Requirements
Power Cable
3 core, 0.75 mm² conductor area (6A)
Communications
Cable
Communications: For use with 4-20mA only or Modbus
only - 2 pairs, 0.5 mm² conductors and with an overall
braided screen.
Communications
Cable
For use with 4-20mA and Modbus - 4 pairs individually
screened, 0.5 mm² conductors and with a overall braided
screen.
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3. OPERATION
Operation of the PROMET EExd Sampling Systems should be carried out in conjunction
with and referring to the PROMET EExd Process Moisture Analyzer Users Guide prior to
commencing system start-up procedure.
Before commencing the start up procedure it is essential to ensure the installation
conforms to the correct Hazardous area and local plant standards.
Check all cables are according to certificated approved specifications and as a minimum
are as described below:
There is a mandatory purge procedure stipulated as part of the hazardous area
certification of the PROMET EExd product. This procedure must be fully carried out prior
to any power or signal connections to the PROMET EExd being energised.
This procedure must also be carried out at any time following service or maintenance
periods that causes any of the PROMET EExd or associated gas handling equipment
sample lines to be disconnected.
It is not necessary to carry out this procedure if, during a shut down period, the sample
lines have not been disconnected, or if the power or signal connections only have been
disconnected.
Before commencement of the start-up procedure ensure that all power and signal
connections to the PROMET EExd flameproof enclosure are fully isolated and if
necessary observe the stipulated de-energisation period of 45 minutes.
Before any gas pressure is applied, check all gas inlet & outlet connections are fully
tightened up and that all valves and regulators are in the closed position.
BEFORE power is applied to the sampling system check that the PROMET EExd Power
Isolator switch is set to the OFF position.
Apply power to the sampling system and allow the temperature within the enclosure to
stabilise. This will prevent the possibility of condensation occurring within the gas
handling components during start-up.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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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 m3/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
m3/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).
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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4. OPTIONS
4.1 Enclosure Heater Temperature Control
Sampling systems fitted within enclosures are temperature controlled to maintain a
constant temperature environment of at least 10oC above the highest envisaged dew
point temperature independent of surrounding temperature variations. The temperature
control system as standard consists of a heater controlled by a fixed preset thermostat
to provide internal ambient air temperature control of >15oC.
As an option the temperature control system can be supplied with a heater controlled
by an adjustable setpoint thermostat to achieve internal ambient air temperature
control up to 60oC for maintaining more stable measurement conditions for installations
in adverse climates.
The capillary tube thermostat marked „Enclosure Heater Thermostat‟ contains an
adjustment screw for the temperature control set point (factory set to approximately
25ºC) to maintain an ambient air temperature >20ºC.
WARNING this operation will expose electrical parts operating at high voltage
therefore isolate power supply from sampling system and if necessary
ascertain that no Explosive Gas Atmosphere is present before making
adjustments.
To adjust the setting proceed as follows:
1. Unscrew and remove the cover of the thermostat box.
2. Turn an adjustment screw pointer located inside, clockwise to increase and anticlockwise to decrease the temperature set point.
3. The temperature markings around the adjustment screw pointer equate to the
approximate temperature values for the heater of 0 ºC to 60 ºC.
4. After adjustment is complete replace the cover of the thermostat box.
WARNING: The thermostat setting should not be increased such that the internal
temperature of the sampling system rises above 60°C which is the
maximum permitted ambient temperature (Tamb) of the certified
PROMET EExd Analyzer.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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4.2 Trace Heated Sample Line
As an option a trace heated sample line can be supplied with sampling systems to
ensure the sample gas temperature from the process take-off point to the analyzer is
maintained at a constant temperature of at least 10
o
C above the highest envisaged
dew point temperature independent of surrounding temperature variations.
The trace heated sample line consists of 6mm OD 316L stainless steel seamless tube
and BSX™ self-regulating heating cable with non-hygroscopic glass fibre insulation and
polymer outer jacket.
The self-regulating heat output of BSX™ cable varies in response to the surrounding
conditions along the entire length of a circuit. Whenever the heat loss increases (as
ambient temperature drops), the heat output of the cable increases. Conversely when
the heat loss decreases (as ambient temperature rises), the cable reacts by reducing its
heat output. BSX™ cables are approved/certified for use in zone 1 & 2 (category 2 & 3)
classified areas.
The trace heated sample line is connected directly onto the Gas Inlet Isolation Valve
(via bulkhead entry seal gland when fitted to an enclosure) within the sampling systems
and the heating cable is terminated onto terminals within the „POWER CIRCUITS‟
junction box. Cable entry into the junction box is provided through an M25 EExe plastic
cable gland.
1 Channel version terminals are marked: 2 Live (either conductor – no polarity)
5 Neutral (either conductor– no polarity)
E Earth (green/yellow conductor)
2 Channel version terminals are marked: 2 & 3 Live (either conductor – no polarity)
6 & 7 Neutral (either conductor– no polarity)
E Earth (green/yellow conductor)
4.3 Enclosure Cooling
As an option an enclosure cooling kit can be fitted to the stainless steel enclosure. The
cooling device is a Vortex tube driven by instrument grade (liquid and particulate free)
compressed air. An adjustable preset thermostat controls a solenoid valve permitting
the flow of compressed air through the vortex tube. A manifold (clear plastic pipe)
positioned around the internal walls of the enclosure distributes the cooling air
throughout.
The cooling thermostat operates when the internal temperature within the enclosure
rises above 40°C and falls below 30°C – switches on and off respectively.
Operation of the enclosure cooling system is fully automatic once a compressed air and
mains power supply are provided then no further adjustment is required.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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5. MAINTENANCE
WARNING This system operates under high pressure. Isolate and depressurise the
sampling systems before attempting any maintenance or servicing.
Maintenance of the PROMET EExd Process Moisture Analyzer Sampling System should
be done in conjunction with the maintenance instructions of the PROMET EExd Process
Moisture Analyzer Users Guide prior to commencing any maintenance.
Routine maintenance of the system is confined to filter element replacements.
5.1 Membrane Filter Element Replacement
Used on Natural Gas systems only!
Life expectancy of the filter element is dependent upon operating conditions in each
specific application. As a minimum, it is recommended that the membrane filter
element be changed every 12 months. If inspection of the removed element shows that
it is in poor/good condition after 12 months operation then the operating period
between replacements may be reduced/increased accordingly.
To replace the membrane filter element, proceed as follows:
1. Isolate the sampling system from the gas supply in accordance with the System
Shutdown Procedure.
2. Unscrew and remove the filter head from the body of the filter (F2).
3. Remove and discard the o-ring and membrane.
4. Refit a new membrane and o-ring
(Michell Part No. PTS-MFE).
5. Replace the filter head back into the body of the filter until it reaches the
mechanical stop. – Do Not Use a Spanner/Wrench!
6. Resume normal system operation in accordance with the System Start-Up
Procedure.
5.2 Glycol Absorption Cartridge Replacement
Used on Natural Gas systems only!
Life expectancy of the absorption cartridge is dependent upon operating conditions in
each specific application. As a minimum, it is recommended that the glycol absorption
cartridge be changed every 1 month. If inspection of the removed cartridge shows that
it is in poor/good condition after 1 months operation then the operating period between
replacements may be reduced/increased accordingly.
To replace the glycol absorption cartridge, proceed as follows:
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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1. Isolate the sampling system from the gas supply in accordance with the System
Shutdown Procedure.
2. Unscrew and remove the filter bowl from the body of the filter (F3).
3. Remove and discard the black glycol filter cartridge.
4. Refit a new glycol filter cartridge
(Michell Part No. PTS-GAC)
.
5. Replace the filter bowl back into the body of the filter until it reaches the
mechanical stop.
6. Resume normal system operation in accordance with the System Start-Up
Procedure.
5.3 Particulate Filter Element Replacement
Used on Natural Gas systems only!
Life expectancy of the filter element is dependent upon operating conditions in each
specific application. As a minimum, it is recommended that the membrane filter
element be changed every 12 months. If inspection of the removed element shows that
it is in poor/good condition after 12 months operation then the operating period
between replacements may be reduced/increased accordingly.
To replace the particulate filter element, proceed as follows:
1. Isolate the sampling system from the gas supply in accordance with the System
Shutdown Procedure.
2. Unscrew and remove the filter hex nut from the body of the filter (F1)
care not to lose the spring inside the nut!
- Take
3. Carefully prise out the sintered filter element from the filter body and
clean/discard the filter element.
4. Push fit a cleaned/new filter element
(Michell Part No. CD2-PFE)
.
5. Replace the filter hex nut back onto the body of the filter until it reaches a
mechanical stop by hand – Tighten (nip) up with a spanner/wrench
spring is present inside the nut!
- Ensure the
6. Resume normal system operation as described in the System Start-Up
Procedure.
Used on Trace Moisture systems only!
Life expectancy of the filter element is dependent upon operating conditions in each
specific application. As a minimum, it is recommended that the particulate filter element
be changed every 12 months. If inspection of the removed element shows that it is in
poor/good condition after 12 months operation then the operating period between
replacements may be reduced/increased accordingly.
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To replace the particulate filter element, proceed as follows:
1. Isolate the sampling system from the gas supply in accordance with the System
Shutdown Procedure.
2. Unscrew and remove the filter bowl from the body of the filter (F1).
3. Remove and clean/discard the filter element.
4. Refit a new filter element
(Michell Part No. PTS-PFE)
.
5. Replace the filter bowl back into the body of the filter until it reaches the
mechanical stop.
6. Resume normal system operation as described in the System Start-Up
Procedure.
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
Gas Wetted Materials:
316L stainless steel with Viton soft parts.
Sample Gas:
Hydrocarbon/Natural Gas
Sample Gas Pressure:
Standard – 1 to 69 barg (1000psig)
High pressure – 1 to 138 barg (2000psig)
Sample Gas Flowrate:
Range 0-0.4 m3/h (0 to 6.66 L/min).
(0.2 m3/h (3.3 L/min) nominal setting)
Bypass Gas Flowrate:
(Natural Gas systems)
Range 0-0.4 m3/h (0 to 6.66 L/min).
(0.36 m3/h (6 L/min) nominal setting)
Filters:
Membrane – type 5 microporous polymer with liquid block.
Glycol – „Ultra Glysorb‟ proprietary absorbent material.
Particulate – 60 micron stainless steel sinter or 5 micron woven
stainless steel micromesh.
Enclosures:
304/316 stainless steel fitted with wall mounting brackets.
(Ingress protection rated to IP66/NEMA 4)
Enclosure Heating:
Standard – 100W heater with preset 20ºC set point thermostat.
(1 heater for 1 Channel, 2 heaters for 2 Channel)
Optional – Adjustable (0-60 C) set point thermostat.
Sample Gas Connections:
6 mm / ¼ “ OD
Swagelok
twin ferrule tube fittings.
Cable Entries:
Ø 20 mm clearance holes in base of enclosures.
ISO M20 threads or plastic EExe cable glands (9-13 mm cable)
in junction boxes.
Power Supply:
110-120 VAC 60 Hz OR 220-240 VAC 50 Hz
Power Consumption:
300 Watt max. for 1 channel, 500 W max. for 2 channel
Operating Temperature:
-20 to +60 C <95%RH
Weight:
60 Kg max. for 1 channel, 90 Kg max. for 2 channel
Enclosure Cooling:
(Optional)
Compressed air via Vortex tube controlled by adjustable set
point thermostat. Maximum cooling capacity = 410W @ internal
temp of 35 C and external temp of 55 C with maximum air
input temperature of 40 C.
Heat Traced Sample Line:
(Optional)
6mm / ¼ “ OD 316L stainless steel seamless tube and BSX™
self-regulating heating cable (15 Watt/metre) with nonhygroscopic glass fibre insulation and polymer outer jacket
(supplied by Thermon type Cellex®Tubetrace®)
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6. TECHNICAL SPECIFICATION
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www.michell.com
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PROMET EExd Process Moisture Analyzer Sampling Systems Installation, Operation & Maintenance Manual and User Guide
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APPENDIX A CONTACT DETAILS
For Customer Service, please feel free to contact us via our website: www.michell.com
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