Michell Instruments Promet I.S Operating Manual

Promet I.S.

Process Moisture Analyzer

User’s Manual

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Process Moisture Analyzer

Multi-Channel Control Unit

97221 Issue 5

March 2017

Please fi ll out the form(s) below for each instrument that has been purchased.

Use this information when contacting Michell Instruments for service purposes.

Analyzer

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Analyzer

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Analyzer

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Promet I.S.

Process Moisture Analyzer

For Michell Instruments' contact information please go to

www.michell.com

© 2017 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. User’s Manual

Contents

Safety ...............................................................................................................................vii

Electrical Safety ..........................................................................................................vii

Pressure Safety ........................................................................................................... vii

Toxic Materials ............................................................................................................vii

Repair and Maintenance ..............................................................................................vii

Calibration .................................................................................................................. vii

Safety Conformity .......................................................................................................vii

Abbreviations .................................................................................................................... viii

Warnings .......................................................................................................................... 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 User Interface ............................................................................................... 5

1.4.2 Power Supply and Input/Output Signal ........................................................... 7

1.5 Sampling System ................................................................................................ 8

2 INSTALLATION ..................................................................................................9

2.1 Unpacking the Analyzer ...................................................................................... 9

2.2 Operating Requirements ................................................................................... 10

2.2.1 Environmental Requirements ....................................................................... 10

2.2.2 Power Requirement ..................................................................................... 10

2.3 Mounting ......................................................................................................... 10

2.3.1 Control Unit Installation ............................................................................... 10

2.3.2 Mounting the Promet I.S. Sensor Assembly into the Sampling System ............. 12

2.3.3 Sampling System Installation ....................................................................... 14

2.4 Wiring ............................................................................................................. 15

2.4.1 Overall Wiring Arrangement ......................................................................... 15

2.4.2 Control Unit Wiring ...................................................................................... 16

2.4.2.1 Power Supply Input Connection.............................................................. 18

2.4.2.2 Sensor Signal Input Connection.............................................................. 20

2.4.2.3 Analog Output Connection ..................................................................... 21

2.4.2.4 Alarm Output Connection....................................................................... 22

2.4.2.5 RS485 Port Connection .......................................................................... 23

2.4.3 Sensor Assembly Wiring .............................................................................. 24

2.4.3.1 Dew-point Transmitter Wiring................................................................. 24

2.4.3.2 Optional Pressure Transmitter Wiring ...................................................... 27

3 OPERATION ....................................................................................................30

3.1 Preparation ...................................................................................................... 30

3.2 Start-Up ........................................................................................................... 30

3.2.1 Function Keys Activation .............................................................................. 30

3.2.2 Powering-up the Analyzer ............................................................................ 31

3.2.2.1 Change Units ........................................................................................ 31

3.2.2.2 Manual Set Pressure Value ..................................................................... 32

3.2.2.3 Display Brightness Adjustment ............................................................... 32

3.2.3 Sample Flow Start-Up .................................................................................. 32

3.3 Menu Structure ................................................................................................ 33

3.4 Main Reading Page ........................................................................................... 35

3.5 Display Set-Up ................................................................................................. 35

3.5.1 Pressure Unit Selection ................................................................................ 35

3.5.2 Settings for the PPMV I (Ideal Gas) Reading ................................................. 36

3.5.3 Setting the Scrolling Interval for a Unit’s Full Name ...................................... 36

3.6 Fault Alarm Set-Up ........................................................................................... 37

iv 97221 Issue 5, March 2017

Promet I.S. User’s Manual

3.6.1 Minimum Dew-point Value for the Fault Alarm ............................................... 37

3.6.2 Maximum Dew-point Value for the Fault Alarm .............................................. 38

3.6.3 Minimum Pressure Value for the Fault Alarm ................................................. 38

3.6.4 Maximum Pressure Value for the Fault Alarm ................................................. 39

3.7 Output Set-Up .................................................................................................. 40

3.7.1 Output Source Selection .............................................................................. 40

3.7.2 Output Range ZERO Value Settings .............................................................. 41

3.7.3 Output Range SPAN Value Settings ............................................................... 41

3.8 Alarm Set-Up ................................................................................................... 42

3.8.1 Alarm Set-Point Adjustment ......................................................................... 42

3.8.2 Alarm Type Selection ................................................................................... 42

3.8.3 Alarm Source Selection ................................................................................ 43

Figures

Figure 1 Promet I.S. Control Unit ..............................................................................1

Figure 2 Structure of the Michell Ceramic Moisture Sensor ..........................................3

Figure 3 Major Components of the Promet I.S. ..........................................................4

Figure 4 User Interface ............................................................................................5

Figure 5 Dimensions of the Control Unit ..................................................................10

Figure 6 Rack Mounting Method .............................................................................11

Figure 7 Promet I.S. Sensor Assembly .....................................................................12

Figure 8 Overall Wiring Arrangement ......................................................................15

Figure 9 Control Unit Electrical Connections .............................................................17

Figure 10 POWER INPUT Socket ...............................................................................18

Figure 11 POWER INPUT Connector Block .................................................................19

Figure 12 SENSOR INPUTS Connector Block ..............................................................20

Figure 13 OUTPUT Connector Block .......................................................................... 21

Figure 14 ALARM Connector Block ............................................................................22

Figure 15 Crimped Wires .........................................................................................25

Figure 16 Cut to 5mm .............................................................................................25

Figure 17 Dew-point Transmitter Housing ................................................................25

Figure 18 Pin Assignment Drawing ...........................................................................26

Figure 19 Pressure Transmitter Connector .................................................................27

Figure 20 Removal of Terminal Block ........................................................................28

Figure 21 Pressure Transmitter Wiring Diagram .........................................................29

Figure 22 Units of Measurement Readings in Sequence ..............................................31

Figure 23 Menu Maps ..............................................................................................34

Figure 24 Dimensional Drawings...............................................................................47

Michell Instruments v

Promet I.S. User’s Manual

Appendices

Appendix A Technical Specifi cations ..............................................................................46

A.1 Dimensional Drawings .................................................................. 47

Appendix B Serial Communications ............................................................................... 49

Appendix C Modbus RTU Comms .................................................................................54

Appendix D Hazardous Area Certifi cation ...................................................................... 57

D.1 Product Standards .......................................................................57

D.2 Product Certifi cation .................................................................... 57

D.3 Global Certifi cates/Approvals ........................................................ 57

D.4 Terminal Parameters .................................................................... 58

D.5 Special Conditions........................................................................ 58

D.6 Maintenance and Installation ........................................................ 58

Appendix E System Drawings ....................................................................................... 60

E.1 Baseefa Approved System Drawing ............................................... 60

E.2 FM Approved System Drawing ...................................................... 61

E.3 CSA Approved System Drawing ..................................................... 62

Appendix F Quality, Recycling & Warranty Information ...................................................64

Appendix G Return Document & Decontamination Declaration ........................................ 66

vi 97221 Issue 5, March 2017

Promet I.S. User’s Manual

Safety

The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. The user must not use this equipment for any other purpose than that
stated. Do not apply values greater than the maximum value stated.

This manual contains operating and safety instructions, which must be followed to ensure the safe
operation and to maintain the equipment in a safe condition. The safety instructions are either
warnings or cautions issued to protect the user and the equipment from injury or damage. Use
competent personnel using good engineering practice for all procedures in this manual.

Electrical Safety

The instrument is designed to be completely safe when used with options and accessories supplied
by the manufacturer for use with the instrument. The input power supply voltage is 85 to 265 V AC
or 10 to 72 V DC. Refer to labels on instrument or calibration certifi cate.

Pressure Safety

DO NOT permit pressures greater than the safe working pressure, as defi ned in the published
specifi cations. to be applied to the instrument.

Toxic Materials

The use of hazardous materials in the construction of this instrument has been minimized. During
normal operation it is not possible for the user to come into contact with any hazardous substance
which might be employed in the construction of the instrument. Care should, however, be exercised
during maintenance and the disposal of certain parts.

Long exposure to, or breathing of, the calibration gases may be dangerous.

Repair and Maintenance

The instrument must be maintained either by the manufacturer or an accredited service agent. Refer
to www.michell.com for details of Michell Instruments’ worldwide offi ces contact information.

Calibration

The recommended calibration interval for the analyzer is 12 months (6 months or less for agressive
gases) depending on the application in which the instrument is used. Please consult Michell
Instruments for the specifi c calibration interval (refer to www.michell.com for details of Michell
Instruments’ worldwide offi ces contact information).

Safety Conformity

This product meets the essential protection requirements of the relevant EU and US standards
and directives. Further details of applied standards may be found in the Technical Specifi cations in
Appendix A.

Michell Instruments vii

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

Promet I.S. User’s Manual

mA milliampere

mg/m

mm millimeters

Nl/min normal liters per minute

ppm

psig pressure in pound(s) per square inch (gauge)

scfh standard cubic feet per hour

T temperature

V Volts

W Watts

” inch(es)

Warnings

The following general warnings listed below are applicable to this instrument. They are
repeated in the text in the appropriate locations.

3

milligrams per cubic meter

parts per million by volume

V

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.

Where this symbol appears in the following sections it is used to

indicate areas of potential risk of electric shock.

viii 97221 Issue 5, March 2017

Promet I.S. User’s Manual

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 fulfi 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 to +20°Cdp ( -148 to +68°Fdp), 0 to 9999
ppm

as well as 0 to 1000 lb/MMscf and g/m3 for natural gas. Selection of the displayed

V

moisture unit of measure is factory-set but may be easily changed by the user. Four
alarm relay contacts are provided which are user-confi 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 fi 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.

INTRODUCTION

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-off point in Zone 0, 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

Michell Instruments 1

INTRODUCTION

1.1 Performance Features

• State-of-the-art ceramic 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.

• Two 4-20 mA output with confi 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 certifi ed traceable to NPL (UK) and NIST
(USA).

• User-programmable or real-time active pressure compensation for
moisture content calculation.

Promet I.S. User’s Manual

• Certifi 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 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

• Offshore export pipeline natural gas

• Transmission pipeline monitoring

• Fiscal metering/custody transfer of gas

• Gas storage facilities

• Refi nery recycle gas – reformer and platformer

• LNG production processing and receiving terminals

2 97221 Issue 5, March 2017

Promet I.S. User’s Manual

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-fi lm
techniques are applied in the Michell Ceramic 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.

INTRODUCTION

Permeable Gold film

g

g

Hygroscopic Mono-layer

Base Electrode

g

Ceramic Substrate

g

Figure 2

Structure of the Michell Ceramic Moisture Sensor

The ceramic 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 certifi ed traceable to NPL (UK) and NIST (USA) through the use of dew-
point transfer standards.

The fi 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.

Michell Instruments 3

INTRODUCTION

1.4 System Components

The Promet I.S. Process Moisture Analyzer consists of:

• the sensor assembly

• the control unit



c



b

Promet I.S. User’s Manual



a

Sensor Assembly

Control Unit

(Up to four channels can have any combination of Promet I.S. and Liquidew I.S.*)

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

4 97221 Issue 5, March 2017

Promet I.S. User’s Manual

Select

1.4.1 User Interface

The Promet I.S. user interface is located on the control unit. There is a two-line, six digit
(15 segment), LED display and four alarm indicators. Five push-button function keys
facilitate data display, parameter setting and system adjustment.

Me

INTRODUCTION

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Figure 4

User Interface

The operation of the function keys are shown below and more information can be found
in Section 3:

•

Menu key:

The Menu key is used to enter and exit the set-up menu.

Menu

•

Menu

Select key:

At any level within the set-up menu, press and hold the
key to return to the default screen.

The Select key is used to enter the sub-menu and to confi rm the
selection.

Michell Instruments 5

•  key:

The  key is used to scroll up through pages in the top and sub­level menus and to increase values in sub-level menus.

INTRODUCTION

•  key:

Promet I.S. User’s Manual

The  key is used to scroll down through pages in the top and
sub-level menus and to decrease values in sub-level menus.

•

Display key

The Display key is used to change the display unit (see Section

3.2.2).

Display

The four LED alarm indicators will light up when the specifi c alarm relay is activated.
Settings for the alarm relays are explained in Section 3.8.

6 97221 Issue 5, March 2017

Promet I.S. User’s Manual

1.4.2 Power Supply and Input/Output Signal

The terminal blocks for the power supply, signal input, signal output and alarm output
are located on the back panel of the control unit (as shown in

• Power Supply

The Promet I.S. requires either 85 to 265 V AC or 10 to 72 V DC power input,
depending on the model ordered.

• 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.

INTRODUCTION

Figure 9)

.

• Signal Output

There are two 4-20 mA linear signal output channels. The output channel 1 is
used for the dew point, moisture or pressure signal, with confi gurable ranges.
Output channel 2 has a fi xed pressure signal and cannot be confi gured.

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 10A
/ 240 V AC or 8A / 24 V DC, non-inductive load. Alarms 3 and 4 are Form
A contacts rated 5A / 240 V AC or 4A / 24 V DC, 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.

Michell Instruments 7

INTRODUCTION

1.5 Sampling System

The Promet I.S. requires a clean sample of the gas mixture that meets the pressure and
fl ow requirements of the transmitter. The design of the sampling system will depend
on the specifi c application.

The requirements for the sample gas going into the sensor block are as follows:

• Temperature: -40 to +60°C (-40 to +140°F)

(-20 to +40°C (-4 to +104°F) recommended for optimum performance)

• Maximum pressure: 45 MPa (450 barg / 5801 psig)

Promet I.S. User’s Manual

• Flow rate: 1 to 5 Nl/min (2.1 to 10.6 scfh)

NOTE: Contact Michell Instruments if you wish to order a specifi c sampling
system.

Please refer to the Promet I.S. Premium Sampling System Instructions if a Michell
sampling system has been ordered with the Promet I.S.

8 97221 Issue 5, March 2017

Promet I.S. User’s Manual

2 INSTALLATION

It is essential that the installation of the electrical and gas

supplies to this analyzer be undertaken by suitably qualifi ed

2.1 Unpacking the Analyzer

Unpack carefully as follows:

INSTALLATION

personnel.

a. Remove the accessories (if ordered).

b. If no accessories have been ordered the delivery should contain following

items:

• Promet I.S. 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)

• User manual

• Certifi cates of calibration and conformity

• Power lead (only for 85 to 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 Promet I.S. Premium Sampling System will be shipped in a separate box.

Michell Instruments 9

INSTALLATION

2.2 Operating Requirements

2.2.1 Environmental Requirements

The Promet I.S. sensor assembly is intrinsically safe and designed to be installed on­site, indoors or outdoors, directly at the point of measurement within a Hazardous
Area. The sensor assembly is ATEX and IECEx or CSA and FM certifi ed (to be specifi 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 to +50°C (+32 to +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.

2.2.2 Power Requirement

The Promet I.S. control unit can be ordered for either of the following electrical supplies:

Promet I.S. User’s Manual

• 85 TO 265 V AC, 47/63 Hz @ 4W max 10W

OR

• 10 to 72 V DC @ 4W max 10W

The Promet I.S. sensor assembly is powered through the 2-wire signal cable directly
from the control unit.

Please refer to the Promet I.S. Premium Sampling System Instructions for the power
requirement of the sampling system.

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.

375mm + 100mm for cable clearance

CHANNEL 1

CHANNEL 2

Figure 5

CHANNEL 3

CHANNEL 4

483mm

(19”)

Dimensions of the Control Unit

(14.75” + 3.9”)

132mm

(5.2”)

3U

10 97221 Issue 5, March 2017

Promet I.S. User’s Manual

INSTALLATION

Figure 6

Figure 6

standard 19” rack. To fi 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

c. Connect up the sensor input, analog and alarm output terminal blocks

d. Slide the instrument into the rack and support its weight while the four

e. Ensure that the front panel of the instrument is fl ush and square with the

f. Insert the terminal blocks into their respective sockets on the rear of the

illustrates the general method for fitting a rack mount instrument into a

the rear and side.

to the internal rack wiring, ensuring that there is suffi cient free cable to
permit withdrawal of the instrument from the rack.

fi xing screws are inserted.

front of the rack and tighten the fi xing screws.

instrument.

Rack Mounting Method

g. Connect the power supply cable and switch the

h. Re-fi t any covers to the rack as necessary.

NOTE: Allow a minimum clearance depth of 100mm (4”) behind the instrument
housing for cables and vents.

ON/OFF switch to ON.

Michell Instruments 11

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.

Promet I.S. User’s Manual

Figure 7

The Promet I.S. sensor assembly consists of:

1

Dew-point transmitter - Easidew PRO I.S.

2

Pressure transmitter (optional)

Sensor block

3

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. Sensor Assembly

12 97221 Issue 5, March 2017

Promet I.S. User’s Manual

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

fl 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).

INSTALLATION

d. The pressure transmitter has a 1/8” NPT thread. It can be installed into

the 1/8” NPTF port on the sensor block. Follow the standard Swagelok
installation instructions to make the connection.

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 suffi 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
ports. Michell recommends using Swagelok® 6mm 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 6mm or 1/4” sampling
system tubing. Follow standard Swagelok® installation instructions to
make the connections.

Figure 7

. Both the gas inlet and outlet port are 1/8” NPT female

®

d. The sensor assembly will then be supported by the tubings connecting

to it.

Although the operation of the Easidew PRO I.S. dew-point transmitter is not sample
fl ow-rate dependant, it is important to ensure that the fl 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 fl ow-rate of 1 to 5 Nl/min
(2.1 to 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.

Michell Instruments 13

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

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 to 60°C (-4 to +140°F) (preferably 0
to +40°C (+32 to +104°F) for optimum performance). Consult Michell
for special heating or cooling options if the temperature is outside of this
range.

Promet I.S. User’s Manual

practices.

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 fi ttings of the inlet/outlet

ports on the sampling system. If the sampling system has been ordered
from Michell, the fi tting is a 6mm or 1/4” Swagelok
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.

®

bulkhead union.

14 97221 Issue 5, March 2017

Promet I.S. User’s Manual

2.4 Wiring

These tasks are to be undertaken only by suitably qualifi 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

EASIDEW PRO I.S.

DEW-POINT TX

4
3
2

1

PRESSURE TX

(optional)

CONTROL UNIT

mA

SCN

+V

SENSOR

mA

INPUTS

SCN

+V

INSTALLATION

-

+

HAZARDOUS AREA

ALARM 2

ALARM 4

ALARM 1

ALARM 3

OUTPUT 1
OUTPUT 2

RS 485

90-264 VAC

POWER SUPPLY

(BY OTHERS)

10-72 VDC

POWER SUPPLY

(BY OTHERS)

SAFE AREA

GND

L
N

E

+V

0V

NO
NC

COM

NO

ALARMS

NO
NC

COM

NO

mA
0V

OUTPUT

mA

5

A
B

COMMS

3

2

POWER
SOCKET

24V

POWER

0V

CONNECTOR

Gnd

or

Figure 8

Overall Wiring Arrangement

Michell Instruments 15

INSTALLATION

2.4.2 Control Unit Wiring

The electrical connections are located at the rear panel of the control unit. There are
spaces for four individual channels.

The only connections on the control unit which can take cables

Promet I.S. User’s Manual

HAZARDOUS AREA INFORMATION:

from hazardous area are the connectors labelled

SENSOR INPUTS.

ALL OTHER CONNECTORS MUST NOT BE CONNECTED TO CABLES

FROM HAZARDOUS AREA

NOTE: Make sure channels are connected correctly.

Connections for each channel are identical.

The following text will only refer to one channel.

16 97221 Issue 5, March 2017