PST Michell Instruments Promet I.S. User manual

Promet I.S.
Process Moisture Analyzer
User Manual
97221 Issue 6
July 2022

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© 2022 Michell Instruments
This document is the property of Michell Instruments Ltd and may not be copied or
otherwise reproduced, communicated in any way to third parties, nor stored in any Data
Processing System without the express written authorization of Michell Instruments Ltd.
Promet I.S.
Process Moisture Analyzer
For Michell Instruments' contact information please go to
www.michell.com

Promet I.S. User Manual
iv 97221 Issue 6, July 2022
Contents
Safety ................................................................................................................................vi
Electrical Safety ..........................................................................................................vii
Pressure Safety ...........................................................................................................vii
Hazardous Materials (WEEE, RoHS3 & REACH) ..............................................................vii
Repair and Maintenance ..............................................................................................vii
Calibration ..................................................................................................................vii
Safety Conformity .......................................................................................................vii
Abbreviations .................................................................................................................... viii
1 INTRODUCTION ................................................................................................1
1.1 Performance Features ......................................................................................... 2
1.2 Applications ....................................................................................................... 2
1.3 Theory of Operation ........................................................................................... 3
1.4 System Components ........................................................................................... 4
1.4.1 Input/Output Signal ...................................................................................... 5
1.5 Sampling System ................................................................................................ 5
2 INSTALLATION ..................................................................................................6
2.1 Unpacking the Analyzer ...................................................................................... 6
2.2 Environmental Requirements ............................................................................... 7
2.3 Mounting ........................................................................................................... 7
2.3.1 Control Unit Installation ................................................................................. 7
2.3.2 Mounting the Promet I.S. Sensor Assembly into the Sampling System ............... 9
2.3.3 Sampling System Installation ....................................................................... 11
2.4 Wiring ............................................................................................................. 12
2.4.1 Overall Wiring Arrangement ......................................................................... 12
2.4.2 Control Unit Wiring ...................................................................................... 13
2.4.2.1 Power Supply Input Connection.............................................................. 14
2.4.2.2 Sensor Signal Input Connection.............................................................. 16
2.4.2.3 Analog Output Connection ..................................................................... 17
2.4.2.4 Alarm Output Connection....................................................................... 18
2.4.2.5 RS485 Port Connection .......................................................................... 19
2.4.3 Sensor Assembly Wiring .............................................................................. 20
2.4.3.1 Dew-point Transmitter Wiring................................................................. 20
2.4.3.2 Optional Pressure Transmitter Wiring ...................................................... 23
3 OPERATION ....................................................................................................26
3.1 Preparation ...................................................................................................... 26
3.2 Start-Up ........................................................................................................... 26
3.2.1 Main Display ............................................................................................... 26
3.2.2 Setup Menu ................................................................................................ 27
3.3 Menu Structure ................................................................................................ 30

Promet I.S. User Manual
Michell Instruments v
Figures
Figure 1 Promet I.S. Control Unit ..............................................................................1
Figure 2 Structure of the Michell Ceramic Metal-Oxide Moisture Sensor .......................3
Figure 3 Major Components of the Promet I.S. ..........................................................4
Figure 4 Dimensions of the Control Unit (in mm) .......................................................7
Figure 5 Rack Mounting Method ...............................................................................8
Figure 6 Promet I.S. Sensor Assembly .......................................................................9
Figure 7 Overall Wiring Arrangement ......................................................................12
Figure 8 Control Unit Electrical Connections .............................................................13
Figure 9 POWER INPUT Socket ...............................................................................14
Figure 10 POWER INPUT Connector Block .................................................................15
Figure 11 SENSOR INPUTS Connector Block ..............................................................16
Figure 12 ALARM Connector Block ............................................................................18
Figure 13 Crimped Wires .........................................................................................21
Figure 14 Cut to 5 mm ............................................................................................21
Figure 15 Dew-point Transmitter Housing ................................................................21
Figure 16 Pin Assignment Drawing ...........................................................................22
Figure 17 Pressure Transmitter Connector .................................................................23
Figure 18 Removal of Terminal Block ........................................................................24
Figure 19 Pressure Transmitter Wiring Diagram .........................................................25
Figure 20 Menu Map ................................................................................................31
Figure 21 Dimensional Drawings (in mm) ..................................................................34
Appendices
Appendix A Technical Specications ..............................................................................33
A.1 Dimensional Drawings ..................................................................34
Appendix B Serial Communications ...............................................................................36
Appendix C Hazardous Area Certication ......................................................................47
C.1 Product Standards .......................................................................47
C.2 Product Certication ....................................................................47
C.3 Global Certicates/Approvals ........................................................47
C.4 Terminal Parameters .................................................................... 48
C.5 Special Conditions........................................................................48
C.6 Maintenance and Installation ........................................................48
Appendix D System Drawings .......................................................................................50
D.1 Baseefa Approved System Drawing ...............................................50
D.2 QPS Approved System Drawing .....................................................51
Appendix E Quality, Recycling & Warranty Information ................................................... 53
Appendix F Return Document & Decontamination Declaration ........................................ 55

Promet I.S. User Manual
vi 97221 Issue 6, July 2022
Safety
The instrument is designed to be completely safe when installed and operated correctly in accordance
with the information provided in this manual.
This manual contains all the required information to install, operate and maintain this product. Prior
to installation and use of this product, this entire manual should be read and understood. Installation
and operation of this product should be carried out by suitably competent personnel only. The
installation and operation of this product must be in accordance with the instructions provided and
according to the terms of any associated safety certicates. Incorrect installation and use of this
product other than those described in this manual and other than its intended purpose will render
all warranties void.
This product meets the essential protection requirements of the relevant EU & UK directives. Further
details of applied directives may be found in the product specication.
Electricity and pressurized gas can be dangerous. This product must be installed and operated only
by suitable trained personnel.
!
No user serviceable parts inside
!
Where this hazard warning symbol appears in the following
sections, it is used to indicate areas where potentially hazardous
operations need to be carried out and where particular attention to
personal and personnel safety must be observed.
Where this symbol appears in the following sections it is used to
indicate areas of potential risk of electric shock.
This product is intended for use only under the following conditions:
a. indoor use
b. altitude up to 2 000 m
c. temperature 5 °C...40 °C
d. maximum relative humidity 80 % for temperatures up to 31 °C decreasing
linearly to 50 %, relative humidity at 40 °C
e. MAINS supply voltage uctuations up to ±10 % of the nominal voltage
f. TRANSIENT OVERVOLTAGES up to the levels of OVERVOLTAGE CATEGORY ll
g. TEMPORARY OVERVOLTAGES occurring on the MAINS supply
h. applicable POLLUTION DEGREE 2 of the intended environment

Promet I.S. User Manual
Michell Instruments vii
Electrical Safety
Ensure electrical safety is complied with by following the directions provided here and observing all
local operation & installation requirements at the intended location of use.
This product is completely safe when using any options and accessories supplied by the manufacturer
of this product for use with it. Refer to Section 2 (Installation) of this manual for further details.
Pressure Safety
For this product to operate satisfactorily, pressurized gas must be connected to it. Observe all the
information contained within this manual and all local operation & installation requirements at the
intended location of use. Refer to Section 2 (Installation) of this manual for further details.
Hazardous Materials (WEEE, RoHS3 & REACH)
This product does not contain or release any prohibited chemicals listed on the SVHC (Substances
of Very High Concern) Candidate List. During the intended normal operation of this product it is not
possible for the user to come into contact with any hazardous materials. This product is designed to
be recyclable except where indicated.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. For
contact information visit the website at www.michell.com.
Calibration
Periodic re-calibration is recommended in order to maintain the highest quality of measurement in
your application. Michell Instruments recommends that you have your Promet I.S. transmitter re-
calibrated annually unless it is used in a mission-critical application or in a contaminated environment,
in which case the calibration interval should be reduced accordingly.
Michell Instruments can oer a variety of re-calibration and exchange transmitter schemes to suit
your specic needs. A local representative will be pleased to provide detailed custom advice.
Safety Conformity
This product meets the essential protection requirements of the relevant EU & UK directives. Further
details of applied standards may be found in Appendix E.

Promet I.S. User Manual
viii 97221 Issue 6, July 2022
Abbreviations
The following abbreviations are used in this manual:
A Ampere
AC alternating current
barg pressure in bar (gauge)
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
dp dew point
Hz Hertz
lb/MMscf pounds per million standard cubic feet
lbf-ft pound force per foot
mA milliampere
mg/m3 milligrams per cubic meter
mm millimeters
Nl/min normal liters per minute
ppmV parts per million by volume
psig pressure in pound(s) per square inch (gauge)
scfh standard cubic feet per hour
T temperature
V Volts
W Watts
” inch(es)

Promet I.S. User Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The Promet I.S. Process Moisture Analyzer is a continuous, on-line instrument for the
measurement of absolute moisture content in gas. It is designed to full a wide range
of applications and provide for the monitoring and/or control of moisture in gas. The
instrument consists of two component parts: the control unit and the sensors’ assembly
(moisture transmitters and optional pressure transmitter). They are individually calibrated
to a single standard allowing for total interchangeability between combinations of
sensors and control units.
The instrument covers the ranges -100...+20 °Cdp (-148...+68 °Fdp), 0...9999 ppmVas
well as 0...1000 lb/MMscf and g/m3 for natural gas. Selection of the displayed moisture
unit of measure is factory-set but may be easily changed by the user. Four alarm
relay contacts are provided which are user-congurable both in terms of set-point and
operating mode. Current output is factory set at 4...20 mA.
The Promet I.S. performs moisture content calculations based on the measured dew
point and the analysis pressure. The default setting of the monitor assumes atmospheric
pressure but the customer can set a xed value of elevated pressure – for this to be
a valid method, the sensor must be installed at a constant, known analysis pressure.
Alternatively, there is an active pressure compensation option providing a loop-powered
intrinsically-safe pressure transmitter connecting to the second input channel on the
control unit, for dynamic pressure compensation.
The Promet I.S. Control Unit must be placed in a non-hazardous area suitable for
electronic analytical equipment. The moisture transmitter and optional pressure
transmitter can be positioned close to the process sample take-o point in a Zone 1 or
Zone 2 (Class I, Division 1, Groups A,B,C and D) hazardous area. The control unit and
transmitters are connected via a standard 2-wire instrumentation cable protected by
safety isolation interface units.
Figure 1 Promet I.S. Control Unit

Promet I.S. User Manual
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INTRODUCTION
1.1 Performance Features
• State-of-the-art ceramic metal-oxide moisture sensor with chemically inert
materials coupled with physical resilience provides long-term reliability
in the most arduous applications. Robust construction also enables
measurement directly at process / pipeline pressure up to 45 MPa (450
barg/5801 psig).
• High integrity moisture measurement from ambient to ppb level with an
exhaustive list of hygrometric units, including key parameters of natural
gas.
• Three 4...20 mA output with congurable units / ranges. RS485 Modbus
RTU communication. Four built-in user-adjustable alarm contacts.
• Assured measurement accuracy with each sensor calibrated across the
entire measurement range and certied traceable to NPL (UK) and NIST
(USA).
• User-programmable or real-time active pressure compensation for
moisture content calculation.
• Certied intrinsically safe.
• Replaceable sensor element with Michell Calibration Exchange Service for
professional, scheduled and low cost recalibration to minimize downtime
and cost.
• Up to four independent measurement channels with any combination of
moisture in gas and moisture in liquid and oxygen measurement at low
per-channel cost.
• Customized sampling systems to meet even the most demanding
applications.
1.2 Applications
• Natural gas production and processing
• Pipeline drying
• Oshore export pipeline natural gas
• Transmission pipeline monitoring
• Fiscal metering/custody transfer of gas
• Gas storage facilities
• Hydrogen production, storage and transportation including natural gas
injection
• LNG production processing and receiving terminals
• Gas generation industries

Promet I.S. User Manual
Michell Instruments 3
INTRODUCTION
1.3 Theory of Operation
The reliable and robust sensor design is fundamental to achieving accurate measurement
of moisture in process over a long period of time. Proprietary thick- and thin-lm
techniques are applied in the Michell ceramic metal-oxide moisture sensor. The inert
materials of the sensor have a high resistance to aggressive media while the inherent
strength of the sensor and the thermal bonded connections to the active device ensures
reliable operation.
Permeable Gold film
Hygroscopic Mono-layer
Base Electrode
Ceramic Substrate




Figure 2 Structure of the Michell Ceramic Metal-Oxide Moisture Sensor
The ceramic metal-oxide moisture sensor responds to the partial pressure of water
vapor in the gas being measured, which is directly related to the dew-point temperature.
Calibration is certied traceable to NPL (UK) and NIST (USA) through the use of dew-
point transfer standards.
The rmware of the Promet I.S. incorporates dew point/pressure to moisture content
conversion data for ideal gas and natural gas. The calculation for natural gas uses either
the long established IGT research Bulletin No.8 or the more recently published ISO
18453, depending on the customer’s preference.

Promet I.S. User Manual
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INTRODUCTION
1.4 System Components
The Promet I.S. Process Moisture Analyzer consists of:
• the sensor assembly
• the multi-channel control unit
a
b
c


Sensor Assembly
Control Unit
(Up to four channels can have any combination of Promet
I.S., Liquidew I.S. or Minox-i O2 sensors*)
a Port for optional pressure transmitter
b Sensor block
c Dew-point transmitter
d User interface
e Electrical connections – to hazardous area
f Electrical connections – to non-hazardous area
Figure 3 Major Components of the Promet I.S.
* Liquidew I.S. is a sister product of the Promet I.S. used for moisture in liquid
measurement; Minox-i is an electrochemical oxygen sensor

Promet I.S. User Manual
Michell Instruments 5
INTRODUCTION
1.4.1 Input/Output Signal
The terminal blocks for the signal input, signal output and alarm output are located on
the back panel of the control unit (see Figure 8) .
• Signal Input
There are two 4...20 mA signal input channels from the dew-point and
optional pressure sensors to the control unit. Both input channels are isolated
by built-in galvanic type I.S. barriers.
• Signal Output
There are three 4...20 mA linear signal output channels. Each output can be
set for either Dew Point, Pressure, ppmV(I), lbmmscf, mg/m3, ppmV(N) % or
ppmVO2.
There is one RS485 Modbus RTU digital communication port. Refer to
Appendix B.
• Alarm Output
There are four alarm relays. Alarms 1 and 2 are Form C contacts rated 30 V
DC 5A, non-inductive load. Alarms 3 and 4 are Form A contacts rated 30 V
DC 5A, non-inductive load. The control actions and set points of these four
alarms are user-programmable. A fault alarm with adjustable set points is
also included.
1.5 Sampling System
The Promet I.S. requires a clean sample of the gas mixture that meets the pressure and
ow requirements of the transmitter. The design of the sampling system will depend
on the specic application.
The requirements for the sample gas going into the sensor block are as follows:
• Temperature: -40...+60 °C (-40...+140 °F)
(-20...+40 °C (-4...+104 °F) recommended for optimum performance)
• Maximum pressure: 13 Mpa (130 barg / 1886 psig)
• Flow rate: 1...5 Nl/min (2.1...10.6 scfh)
NOTE: Contact Michell Instruments if you wish to order a specic sampling
system.
Please refer to the ES70G Sampling System manual if a Michell sampling system has
been ordered with the Promet I.S.

Promet I.S. User Manual
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INSTALLATION
2 INSTALLATION
It is essential that the installation of the electrical and gas
supplies to this analyzer be undertaken by suitably qualied
personnel.
2.1 Unpacking the Analyzer
Unpack carefully as follows:
a. Remove the accessories (if ordered).
b. If no accessories have been ordered the delivery should contain following
items:
• Promet I.S. multi-channel control unit
• Promet I.S. sensor assembly (if a sampling system has been
ordered, the sensor assembly should already be mounted in the
sampling system)
• Certicates of calibration and conformity
• Power lead (only for 85...265 V AC version)
c. Remove the Promet I.S. sensor assembly from the box.
d. Lift out the control unit together with its end packing pieces.
e. Remove the end packing pieces and set the control unit down at the site
of installation. Save all the packing materials for the purpose of returning
the instrument to the manufacturer for service.
If ordered, the ES70G Sampling System will be shipped in a separate box.

Promet I.S. User Manual
Michell Instruments 7
INSTALLATION
2.2 Environmental Requirements
The Promet I.S. sensor assembly is intrinsically safe and designed to be installed on-
site, indoors or outdoors, directly at the point of measurement within a Hazardous Area.
The sensor assembly is ATEX, UKCA, IECEx and QPS certied (to be specied at time
of order). To operate correctly, the sensor assembly must be installed within a suitable
sampling system (Michell Instruments can supply standard and custom designed
sampling systems).
The Promet I.S. control unit is NOT designed for use in a Hazardous Area and should
only be installed in a safe area. The control unit is intended for indoor installation only
and operates within environmental limits of 0...+50 °C (+32...+122 °F) and <90 %rh.
The control unit contains built-in isolation barriers permitting connection, direct from
the Hazardous Area, of the Promet I.S. sensor assembly.
2.3 Mounting
2.3.1 Control Unit Installation
The Promet I.S. control unit is contained in a 19” sub-rack case (size 3U). It should
be installed in a 19” rack using the mounting holes provided. It should be placed in a
position free from any appreciable vibration and shaded from direct sunlight.
NOTE: The materials and construction of the control unit allow for operation
in an indoor, clean, non-hazardous only, control room environment.
483
133
349 16
Figure 4 Dimensions of the Control Unit (in mm)

Promet I.S. User Manual
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INSTALLATION
483
133
349 16
Figure 5 Rack Mounting Method
Figure 5 illustrates the general method for fitting a rack mount instrument into a
standard 19” rack. To t the unit proceed as follows:
a. Remove all terminal blocks for the electrical connections.
b. If necessary, remove any covers from the rack cabinet to gain access to
the rear and side.
c. Connect up the sensor input, analog and alarm output terminal blocks
to the internal rack wiring, ensuring that there is sucient free cable to
permit withdrawal of the instrument from the rack.
d. Slide the instrument into the rack and support its weight while the four
xing screws are inserted.
e. Ensure that the front panel of the instrument is ush and square with the
front of the rack and tighten the xing screws.
f. Insert the terminal blocks into their respective sockets on the rear of the
instrument.
g. Connect the power supply cable and switch the ON/OFF switch to ON.
h. Re-t any covers to the rack as necessary.
NOTE: Allow a minimum clearance depth of 100 mm (4”) behind the instrument
housing for cables and vents.

Promet I.S. User Manual
Michell Instruments 9
INSTALLATION
2.3.2 Mounting the Promet I.S. Sensor Assembly into the Sampling System
HIGH PRESSURE! High pressure gases are potentially hazardous.
Energy stored in these gases can be released suddenly and with
extreme force. High pressure systems should be assembled and
operated only by people who have been trained in proper safety
practices.
NOTE: If the analyzer has been ordered with a sampling system, the Promet
I.S. sensor assembly will have been installed and tested in the factory. In
that case disregard the following section and go to Section 2.3.3.
Figure 6 Promet I.S. Sensor Assembly
The Promet I.S. sensor assembly consists of:
1 Dew-point transmitter – Easidew PRO I.S.
2 Pressure transmitter (optional)
3 Sensor block
To assemble, proceed as follows:
a. Remove the protective cap on the dew-point transmitter (Easidew PRO
I.S.) before installation and retain for future use. Take care to prevent any
contamination of the sensor before installation (do not touch or handle
the sintered guard – located on the tip of the Easidew PRO I.S.).

Promet I.S. User Manual
10 97221 Issue 6, July 2022
INSTALLATION
b. The dew-point transmitter has a 5/8” UNF parallel mounting thread which
should be installed directly into the sampling block with the bonded
seal provided. The bonded seal provided should be placed over
the transmitter mounting thread before it is screwed into the
sampling block.
c. Finger tighten the dew-point transmitter by gripping the spanner/wrench
ats on the body – NOT the transmitter body cover. Completely tighten
using a spanner/wrench until the bonded seal is fully compressed to a
minimum torque of 30.5 Nm (22.5 lbf-ft).
d. The pressure transmitter can be installed into one of NPTF ports on the
sensor block.
To install the complete Promet I.S. sensor assembly into the sampling system, follow
these steps:
a. Select a location to mount the sensor assembly which has sucient
clearance for connecting and disconnecting the inlet/outlet tubing and
cable. The surface should be strong enough to hold the analyzer.
b. Mount the Promet I.S. sensor assembly into the sampling system via its
two mounting holes.
c. Sample gas connections are made via the gas inlet and gas outlet ports as
shown in Figure 6 . Both the gas inlet and outlet port are 1/8” NPT female
ports. Michell recommends using Swagelok® 6 mm to 1/8” NPT (ordering
code SS-6M0-1-2) or 1/4” to 1/8” NPT (ordering code SS-400-1-2) male
connectors to connect these two ports to the 6 mm or 1/4” sampling
system tubing. Follow standard Swagelok® installation instructions to
make the connections.
Although the operation of the Easidew PRO I.S. dew-point transmitter is not sample
ow-rate dependant, it is important to ensure that the ow velocity through the sample
line to the sampling block is high enough to avoid long time lags in response to changes
in moisture at the sample source. Michell recommends that a ow-rate of 1...5 Nl/min
(2.1...10.6 scfh) (or equivalent at pressure) be set and that the dew-point transmitter
is mounted as close as practicably possible to the sample source.

Promet I.S. User Manual
Michell Instruments 11
INSTALLATION
2.3.3 Sampling System Installation
HIGH PRESSURE! High pressure gases are potentially hazardous.
Energy stored in these gases can be released suddenly and with
extreme force. High pressure systems should be assembled and
operated only by people who have been trained in proper safety
practices.
To install the sampling system follow the steps below:
a. Select a location close to the measurement point. The ambient temperature
should be within the range of -20...60 °C (-4...+140 °F) (preferably
0...+40 °C (+32...+104 °F) for optimum performance). Consult Michell
for special heating or cooling options if the temperature is outside of this
range.
b. Fasten the sampling system to a vertical surface or instrument stand
using the four M8 size mounting holes at each corner.
c. Connect the sample inlet and outlet tubing to the ttings of the inlet/outlet
ports on the sampling system. If the sampling system has been ordered
from Michell, the tting is a 6 mm or 1/4” Swagelok® bulkhead union.
Follow standard Swagelok® installation instructions for the connection
procedure.
NOTE: The sampling line between the process point and the sampling system
should be as short as possible to minimize the lag time.

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INSTALLATION
2.4 Wiring
These tasks are to be undertaken only by suitably qualied
personnel. All the connections to the rear panel are electrical
connections. Exercise due caution, particularly when connecting
to external alarm circuits which could be at high potential.
2.4.1 Overall Wiring Arrangement
mA+
SCN
+V
mA+
SCN
+V
N/O
N/C
COM
N/O
N/O
N/C
COM
N/O
mA1
mA2
0V
mA3
SCN
5
3
2
L
N
E
GND
A
B
4
3
2
1
-
+
SENSOR
INPUTS
ALARMS
OUTPUTS
COMMS
POWER
SOCKET
EASIDEW PRO I.S.
/ LIQUIDEW I.S.
DEW POINT Tx
PRESSURE /
TEMPERATURE
Tx (OPTIONAL)
CONTROL UNIT
ALARM 3
ALARM 4
ALARM 1
ALARM 2
OUTPUT 1
OUTPUT 2
OUTPUT 3
RS 485
90-264 V AC
POWER SUPPLY
(BY OTHERS)
+V
0V
POWER
CONNECTOR
18-28V DC
POWER SUPPLY
(BY OTHERS)
OR
24V
0V
GND
SAFE AREAHAZARDOUS AREA
Figure 7 Overall Wiring Arrangement