Process Analyzers
Promet EExd
Process Moisture Analyzer
The complete moisture measurement package for critical process gas applications.
Highlights
• EExd fl ameproof certifi ed - IECEx, ATEX, CCSAUS and
TC TR Ex
• Complete hazardous area installation
• Single or dual-channel measurements
• Moisture content, dew point and pressure
• Calibration traceable to NPL (UK) and NIST (US)
• Range -120 to +30°C dew point, 0.001 to
30,000 ppm
• Remote global access options
• Sour gas compatible
• Field calibration maintenance
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Applications
• Natural gas glycol dehydration
• Offshore export pipeline natural gas
• Transmission pipeline monitoring
• LNG production
• Catalytic reformer recycle hydrogen
• Ethylene feed stock to polymer plant
• Speciality gas production
Process Analyzers
Promet EExd – The Moisture Analyzer
for the Modern Process Environment
Promet EExd offers single and dual channel moisture
measurement, with integrated electronic pressure reading,
within a single fi eld-installed fl ameproof housing. User interface
is provided through the bright vacuum fl uorescent display and
touch screen switches.
Comprehensive Sampling Systems of state-of-the-art design,
with best practice sample fi ltration, pressure reduction and
fl ow control, and a range of options are available to fulfi l user
specifi c installation and application requirements.
Simple Flameproof Installation
Promet EExd is fl ameproof certifi ed for use in IEC Zone 1 and
2/NEC Class 1 Div. 1 and 2 hazardous areas. The Main Unit
(electronics and sensing) and associated sampling system may
be mounted at a convenient location next to the pipeline or
process, with gas sample and vent connections. A single, low
power single-phase AC supply is required for both the analyzer
and sampling system. No barrier units or safety earth are
required, saving the user both cost and inconvenience.
Advanced Sensor Technology
Promet EExd utilises the Michell Ceramic Moisture Sensor,
offering unrivalled reliability and performance with more than
1,000 installations in natural gas and petrochemical installations
world-wide.
Comprehensive Measurement Units
Promet EExd offers complete fl exibility for the user to select
the preferred hygrometric unit, be it dew-point temperature
in °C or °F, or an exhaustive list of moisture content units.
Integral pressure measurement enables unit conversions from
dew point to moisture content, or dew point to dew point for
different pressure conditions.
The fi rmware of Promet EExd incorporates conversion data
for ideal gases and also specifi c to natural gas, using either
the long established IGT Research Bulletin No. 8 or the more
recently published ISO 18453, to customer order preference.
Calibration Maintenance Made Easy
Maintenance of traceable calibration is essential to the lifetime
performance of all analyzers. Beware claims of “automatic
calibration”. This is a non-traceable, internal fi eld check and
does not represent a true calibration of the analyzer.
For Promet EExd, true calibration maintenance is simple. The
unique Michell Calibration Exchange Service offers fast delivery,
world-wide, of newly calibrated replacement Ceramic Sensors
certifi ed traceable to NPL and NIST. As the calibration data for
the Promet EExd Sensor is programmed into on-board nonvolatile memory, fi tment of a Calibration Exchange Sensor
renews the calibration with minimal downtime.
Thick- and thin-fi lm semiconductor technologies with
metallized ceramics produce an exceedingly durable sensor,
with measurement sensitivity to 10 ppb
high-pressure capability up to 138 barg (2000 psig).
Unlike older aluminium-oxide technologies, the inherent
immunity to pressure shock of the Ceramic Sensor completely
avoids any risk of sensor failure at commissioning or shut-down,
whilst the unique inert nature of the sensor gives unrivalled
long-term resistance to chemical attack, even in extremely sour
gas with percentage level H
The Ceramic Sensor responds to the partial pressure of water
vapour in the gas being measured, which is directly related
to the dew point temperature. Every Promet EExd sensor is
calibrated against fundamental dew point measurement systems
in Michell’s world-class laboratory, which is internationally
accredited and directly traceable to both NPL (UK) and NIST
(USA) base standards. Precise process moisture measurement
with a class leading best accuracy of ±10% of measured value
is assured.
S concentrations.
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moisture content and
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No programming or data input is required by the user to
complete the calibration process. The Calibration Exchange
Service facilitates a professional, scheduled user QA programme
at a lower cost than a traditional ‘return to manufacturer’ recalibration service.
Calibration or exchange is recommended annually for sweet
gases and six-monthly for sour gases. Field calibration, using
a portable dew point generator (ASTM D5454), against a
calibrated reference hygrometer or against certifi ed moisture-
in-gas cylinders is also possible. Promet EExd accommodates
such needs within the operating fi rmware, providing user-
friendly access to the calibration characterisation table to allow
adjustments to be made at just one point (for example using
a certifi ed moisture in gas cylinder) or multiple points (using a
fi eld generator) across the measurement range.
Temperature Controlled for Best Accuracy
To ensure continuous optimum performance, the Promet
EExd Main Unit is internally temperature controlled at the
normal maximum local environmental temperature. This
greatly reduces the effect of diurnal temperature variations
that would otherwise introduce transitional adsorption and desorption effects in the sampling system components and result
in erroneous measurements during periods of temperature
change.
In addition the Promet EExd features an advanced temperature
compensation algorithm that automatically maintains best
possible measurement accuracy in the event of heater failure
or if the prevailing climate exceeds the set temperature level.
© 2018 Michell Instruments
Promet EExd
Premium Sampling System
Analyzer/sampling system features
• Certifi ed explosionproof/EExd
• Houses analyzer main unit, 1- or 2-channel measurement
• Remote global access options
• User friendly display and ‘touch glass’ keyboard
• Outputs: alarms and analog digital communications
• ATEX, IECEx,
• Measurement Units:
moisture content ppmV (ideal gas/natural gas)
lbmmscf and mg/m-3 for natural gas
dew point, °C and °F
sample pressure, barg, MPa and psig
• Heating/Thermostat Options
• One or two stage sample fi ltration
• Optional sample cooling
• Complete hazardous area installation – indoor or outdoor
• Optional enclosure cooling
• Wide choice of standardized design options
• Non-standard customized solutions
CCSAUS, and TC TR Ex approved
Trace Moisture Sampling System - Single Channel
4-20mA
OUTPUT
PG1
PR1
NRV1
FM1
BV2
GAS OUTLET
BV3
GAS VENT
GAS INLET
BV1
F1
PROMET EExd
ANALYSER
Natural Gas Sampling System - Single Channel, High Pressure
© 2018 Michell Instruments
Promet EExd Main Unit Only – ‘Touch Glass’ HMI alphanumeric display,
menu confi guration by user
Communication Capability for Total Plant
Integration
Promet EExd offers digital and analogue communications as
standard.
• Modbus RTU is provided with optional Active X controls for
integration to site SCADA/DCS.
• Two non-isolated 4-20 mA outputs per channel are user
confi gurable for unit and range of measurement.
• Process alarm contacts can be set by the user.
• Instrument status alarms provide a continuous ‘health
check’ through to the site control room.
• Low sample fl ow alarms are available as an option. Such
individual alarm states are identifi ed through the Modbus
instrument registers and appear locally on the display.
• Field cable connections are conventional instrumentation
pairs for all signals and alarms.
Process Analyzers
Premium Sampling Systems
Good sample conditioning and handling is particularly important
in the fi eld of moisture measurement. As the moisture sensor
has to be exposed directly to the process gas stream in order to
detect the water vapour present, then key sampling issues such
as the avoidance of particulate and liquid contamination are
imperative to successful operation. Our 30 years of expertise in
on-line process gas analyzers are used to optimise the design
of the Promet EExd Premium Sampling Systems.
Two core confi gurations, both available in either single- or dual-
channel version, are available for key applications:
Natural Gas Processing and Transmission
Sampling Systems
The reliable solution for glycol dehydration processes offshore
and onshore and for onward pipeline transmission of sales gas.
The most advanced fi ltration techniques with micro-porous
membrane and continuous by-pass fl ow remove and dispose
of all liquid phase contaminants. A glycol adsorption cartridge
removes residual vapour that may otherwise interfere with the
moisture signal.
Trace Moisture in Hydrocarbon Gas
Sampling System
An optimised design for continuous trace moisture
measurement in low ppmV and ppbV ranges for molecular
sieve dehydration of natural gas prior to cryogenic liquefaction.
Also suitable for many other monitoring applications at trace
moisture levels in refi nery gases and critical petrochemical
processes. A minimalist approach to the sampling system
design is essential to ensure best dynamic response to process
moisture variations. A particulate fi lter and isolation valve are
the only components prior to the sensor. As measurements are
made at pipeline conditions, no regulators or other complex
upstream components are necessary so ensuring the Promet
EExd remains in continuous equilibrium with the process gas
condition without any signifi cant response lag.
Custom Design Service
Custom design sampling systems are available for other specifi c
applications such as higher pressure processes and hydrogen
recycle gas moisture measurement in catalytic reformer
refi nery processes. Your Michell offi ce or authorised distributor
will be pleased to discuss your specifi c application/ installation
requirements.
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Process Analyzers
Technical Specifi cations
Channel Confi gurations Single and two channel
Moisture Parameters Dew point °C and °F
Moisture Content Automatic pressure compensated conversions:
Analysis Pressure barg, MPa and psig
Sensor Technology Michell Ceramic Moisture Sensor
Measurement Range -120ºC dp to +30ºC dp
Calibration Range -100°C dp to +20°C dp
Accuracy Dew point: ±1°C between –59.9 & +20°C dp
Measured Resolution 0.1°C: –80 to +20°C dp
Displayed Resolution Dew point: 0.1°C
Resolution 0.1°C between +20°C dp and -80°C dp
Temperature Coeffi cient Algorithm compensation (-20 to +50°C)
HMI: Keyboard
Interface
Display Vacuum fl uorescent
Datalogging A rolling maximum of 150 data logs is
Communications and
Output
Main Unit Enclosure Internal temperature control for condensation
Type Flameproof EExd
Construction Cast copper-free aluminium
Finish Chromate primer, Polyester P9010 powder
Operating Pressure Max. 138 barg (2000 psig)
Sample Connections 1/8” NPT (F)
Sample Flow Rate 0.5 to 5.0 litres per min
Sample Flow Alarm Optional
Power Supply 90 to 260 V AC, 50/60 Hz, 180 W Main Unit
Operating Environment Indoor/Outdoor -20°C to +60°C
ppm
for natural gas and ideal gas,
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lbmmscf and mg-m
Dew point at a pressure input by the user for
natural gas and ideal gas.
Calculations for natural gas moisture content
based on either IS0 18453 or IGT#8 to
customer order preference.
to 30,000 ppm
1 ppb
V
0 to 250 barg
to 23,000 ppm
10 ppb
V
Moisture content: ±10 % of reading
Dew point: ±2°C between –60 & -100°C dp
Moisture content: ±20 % of reading
Analysis Pressure: ±0.25 % FS.
1°C: –100 to -80°C dp
Moisture content: autoscale, 5 digits
MPa and BarG: 0.1, psig: 1.0
1°C between -80°C dp and -100°C dp
Capacitive touch-screen through glass
available.
Each log records time, date, moisture and
pressure values for each channel.
5 minutes minimum and 60 minutes maximum
logging intervals can be set by the user
Two non-isolated 4-20 mA per measurement
channel. 500 Ω maximum load. Range and
parameter settable by user.
Modbus RTU @ 9600 baud-rate
Alarms: two volt free contacts per channel; one
process value and one instrument status. Also
available via Modbus communications
protection and stable analysis conditions
coated (black). Meets BS3900
Max 95 % rh. Shaded location
-3
for natural gas.
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Certifi cation
Hazardous Area
Certifi cation
Pattern Approval GOST-R, GOST-K
*Available to customer specifi c order — consult Michell
Instruments
For details of confi gurations and options, please refer to the
Promet EExd Order Codes list. If not appended to the end of
this datasheet, copies are available from the Michell Instruments
website or from your local Michell Instruments offi ce.
ATEX II 2G Ex d IIB + H2 Gb T5 (-40°C to
+44°C)
T4 (-40°C to +60°C)
IECEx Ex d IIB + H2 Gb T5 (-40°C to +44°C)
T4 (-40°C to +60°C)
cCSAus Class I, Division 1, Group B, C, D, T4
Tamb -40°C to +60°C
TC TR Ex 1Ex d IIB + H2 T4, T3 Gb (-40°C to
+60°C)
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Main Unit
1/8" NPT Female (ATEX/IECEx)
Sample in - Channel 1
1/4" NPT Female (CSA)
Flame Arrestor
Inlet 1/8" NPT Fem ale (ATEX/IECEx)
Sample out - Channel 1
Inlet 1/4" NPT Fema le (CSA)
Flame Arrestor
355mm [13.9"]
245mm 9.65"
290mm [11.41"]
310mm [12.20"]
Sample Out - Channel 2 (Optional)
Flame Arrestor
Outlet 1/4" NPT Fema le (CSA)
Outlet 1/8" NPT Fema le (ATEX/IECEx)
Sample In - Channel 2 (Optional)
Flame Arrestor
Outlet 1/4" NPT Fem ale (CSA)
Outlet 1/8" NPT Fem ale (ATEX/IECEx)
3 o 1/2" NPT (CSA)
Cable Entry Glands
3 o M20 (ATEX)
Enclosure Breather
Flame Arrestor
Do NOT obscure
318mm 12.52"
Sampling Systems
Indoor Single Channel Galvanised Steel
Panel
750mm 29.53"
726mm 28.58"
700mm 27.56"
270mm 10.63"
4 o M12 (1/2")
Clearance
Outdoor Single Channel Stainless Steel
Enclosure
800mm 31.50"
758mm 29.84"
1000mm 39.37"
970mm 38.19"
950mm 37.40"
463mm 18.23" 463mm 18.23"
1050mm 41.34"
Two channel versions
Indoor panel: 950 x 970 x 260 mm (W x H x D)
Enclosure depth: 300 mm
36.7 x 38.1 x 10.2 inches (W x H x D)
Outdoor enclosure: 1000 x 1050 x 312 mm (W x H x D)
39.3 x 41.3 x 12.3 inches (W x H x D)
Michell Instruments Ltd, Rotronic Instruments Corp. 135 Engineers Road, Suite 150, Hauppauge NY 11788 Way Business
Tel: 631 427 3898, Email: us.info@michell.com, Web: www.michell.com/us
Michell Instruments adopts a continuous development programme which sometimes necessitates specifi cation changes without notice.
Issue no: Promet EExd_97151_V7_UK_0718
© 2018 Michell Instruments
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