Process Analyzers
Promet I.S.
Process Moisture Analyzer
Promet I.S. Process Moisture Analyzers are heavy duty, industrial hygrometer systems for
measurement of high pressure, process gases and vaporized liquids on natural gas platforms and
terminals, petrochemical plants and industrial gas manufacturing facilities. Promet I.S. combines
Michell’s proven ceramic moisture sensor with sample conditioning system design engineering
capabilities to provide a reliable and easy to operate, multi-channel on-line instrument for both
ammable and non-ammable gases.
Highlights
• Simple, cost ecient operation and low-maintenance
• Immune to chemical attack from H2S, mercaptans
and other sulphides
• Protected against glycol or other liquid contaminants
• Accurate direct dew-point measurement at process
pressure up to 45 MPa (450 barg)
• Moisture range from ambient to ppb level with
exhaustive list of hygrometric units, including key
parameters of natural gas
• Two 4-20 mA congurable outputs and digital
Modbus RTU based communication.
• Assured calibration integrity traceable to NPL (UK)
and NIST (USA)
• User programmable or real-time active pressure
compensation for moisture content calculation
• Multichannel with up to 4 independent measurement
channels
www.michell.com
Applications
• Natural gas production and processing
• Pipeline drying
• Oshore export pipeline natural gas
• Transmission pipeline monitoring
• Fiscal metering of gas
• Gas storage facilities
• Renery recycle gas – reformer and platformer
• LNG production processing and receiving terminals
Process Analyzers
Michell Promet I.S.
Process Moisture Analyzer
Michell Promet I.S. is a rugged on-line instrument tailored to
customers’ specic application and technical requirements.
Measurements can be made across a wide range from -100 to
+20°C dew point with an accuracy of ±1°C dew point and at
process or pipeline pressures up to a maximum of 45 MPa.
The rack-mounted Promet I.S. Control Unit provides realtime two-line display of moisture content/dew point and
pressure, user settable alarms together with analog output and
digital communications, conveniently located in a safe area.
Intrinsically safe sensors, with a sampling system, are installed
in the hazardous zone to minimize sample transportation time
and ensure fast response to process moisture changes.
The Control Unit in the multi-channel MCU format can also
include moisture in liquid analysis function by combining with
Liquidew I.S. Moisture in Liquid Analyzer.
Calibration integrity for accurate measurement
The Promet I.S. Ceramic Moisture Sensors are individually
calibrated down to -100°C dew point/10 ppbV. This avoids the
common problems associated with other trace moisture solution
providers of lack of calibration integrity at trace moisture levels
together with low end drift to the dry and failing to respond to
increase in process moisture condition after extended period of
‘desiccation’.
All Michell moisture probe calibrations are traceable to the
humidity standards of leading international metrology institutes,
NPL (UK) and NIST (USA), so assuring correct measurement of
the moisture in your process.
Measurements at line pressure made easy
The Promet I.S. features moisture content calculation with user
input analysis pressure but, in applications where pressure
varies, the real-time pressure sensor signal provides more
accurate, active compensation for moisture content conversion.
(Pressure sensor optional.)
Features
Multi-Channel Unit
Reliable measurement
Michell’s process industry-proven moisture sensor used in the
Promet I.S. is exceedingly durable. Chemically inert materials
coupled with physical resilience provide long-term reliable
service in process measurements of up to 45 MPa, enabling
measurement directly at process/pipeline pressure. The sensor
is protected against glycol and other process borne liquid
contaminants as well as immune to chemical attack from H2S,
mercaptans and other sulphides.
Easy to use with complete functionality
The 19” sub-rack mounting Promet I.S. Control Unit is simple
to operate. The bright alphanumeric LED display with optional
live pressure compensation provides unit conversions from dew
point to an exhaustive list of moisture content units, so the
user has exibility to select the preferred hygrometric unit. The
conversion method is for ideal gases and also specic to natural
gas, using either the long established IGT Research Bulletin No.
8 or the more recently published ISO 18453, to customer order
preference.
The front panel interface, enables the user to scroll through
the set-up menus to easily congure the analyzer to their
own requirements. Four user-adjustable alarm points and two
analog 4-20 mA outputs are provided as well as a digital RS485
RTU for connection to external devices.
Superior measurement stability
To ensure continuous optimum performance, the Promet I.S.
sampling system is internally temperature controlled. This
greatly reduces the eect of potential temperature variations
that would otherwise introduce transitional adsorption and
desorption eects in the sampling system components
and result in erroneous measurements during periods of
temperature change. Best practice also dictates that sample
line tubing should be maintained at an elevated temperature,
so for customer convenience, self limiting heated tube bundle
is available as a factory option for Promet I.S. sampling system.
Certied intrinsically safe
Promet I.S. sensors and sampling systems are designed for
ammable and non-ammable gas within hazardous areas.
ATEX certied by EECS for use in hazardous areas to II 1G EEx
ia IIC T4. Complete packages conforming to NEC Class 1 Div
1 or IECEx certications are also available. Promet I.S. carries
GOST pattern approval and GOST Ex.
Simple to maintain with a sensor calibration exchange
program
For Promet I.S., calibration maintenance is simple. The unique
Michell Calibration Exchange Service oers fast, world-wide
delivery of replacement ceramic sensors certied traceable to
metrology standards of NPL and NIST. As the calibration data
for the sensor is factory programmed into on-board non-volatile
memory, no programming or data input is required by the
user to complete the calibration process. Fitting a Calibration
Exchange Sensor renews the calibration, with minimal downtime. The Calibration Exchange Service facilitates a professional,
scheduled user QA programme at a lower cost than a traditional
‘return to manufacturer’ recalibration service.
www.michell.com
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