Michell Instruments ES20 User manual

ES20
Compact Sampling System
User’s Manual
97447 Issue 2
December 2017

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© 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.
For Michell Instruments' contact information please go to
www.michell.com
ES20
Compact Sampling System

ES20 User’s Manual
iv 97447 Issue 2, December 2017
1 INTRODUCTION ............................................................................................VIII
1.1 Materials ......................................................................................................... viii
1.2 Filtration .......................................................................................................... viii
1.3 Pressure Control and Measurement ..................................................................... 1
1.4 Flow Control ..................................................................................................... 1
1.5 Mounting Variants ............................................................................................. 1
1.6 System Designs ................................................................................................. 1
1.7 System Configurations ........................................................................................ 2
1.8 Enclosure Configurations..................................................................................... 3
2 INSTALLATION ..................................................................................................4
2.1 Sampling System Installation............................................................................... 4
2.1.1 Relevant Manual Section for Installation.......................................................... 4
2.2 Process or Atmospheric Pressure With Particulate Filter ........................................ 5
2.2.1 Mounting Details ........................................................................................... 5
2.2.2 Gas Connections ........................................................................................... 5
2.2.3 Electrical Connections.................................................................................... 5
2.2.4 Power Supply................................................................................................ 5
2.3 Process or Atmospheric Pressure With Coalescing Filter ........................................ 6
2.3.1 Mounting Details ........................................................................................... 6
2.3.2 Gas Connections ........................................................................................... 6
2.3.3 Drainage Connections.................................................................................... 6
2.3.4 Electrical Connections.................................................................................... 6
2.3.5 Power Supply................................................................................................ 6
2.4 Vacuum Pressure With Particulate Filter .............................................................. 7
2.4.1 Mounting Details ........................................................................................... 7
2.4.2 Gas Connections ........................................................................................... 7
2.4.3 Electrical Connections.................................................................................... 7
2.4.4 Power Supply................................................................................................ 7
2.5 Dew-Point Measurement System.......................................................................... 8
2.6 Monitor Installation............................................................................................. 8
2.7 Process Connection ............................................................................................ 9
2.7.1 Transmitter Connection.................................................................................. 9
2.7.2 Monitor Connection ....................................................................................... 9
2.7.3 Terminal Rail Connection ............................................................................... 9
3 OPERATION ....................................................................................................10
3.1 Sampling Start-Up Procedure............................................................................. 10
3.1.1 Relevant Manual Section for Operation ......................................................... 10
3.2 Process Pressure With Particulate Filter .............................................................. 11
3.2.1 Sample Flow 'Start-Up' Procedure................................................................. 11
3.3 Process Pressure with Coalescing Filter .............................................................. 11
3.3.1 Sample Flow 'Start-Up' Procedure................................................................. 11
3.4 Atmospheric Pressure with Particulate Filter........................................................ 12
3.4.1 Sample Flow 'Start-Up' Procedure................................................................. 12
Contents
Safety ................................................................................................................................vi
Electrical Safety ...........................................................................................................vi
Pressure Safety............................................................................................................vi
Toxic Materials .............................................................................................................vi
Repair and Maintenance ...............................................................................................vi
Safety Conformity ........................................................................................................vi
Abbreviations.....................................................................................................................vii
Warnings ........................................................................................................................... vii

ES20 User’s Manual
Michell Instruments v
3.5 Atmospheric Pressure with Coalescing Filter ....................................................... 12
3.5.1 Sample Flow 'Start-Up' Procedure................................................................. 12
3.6 Vacuum Pressure With Particulate Filter ............................................................ 13
3.6.1 Sample Flow 'Start-Up' Procedure................................................................. 13
4 MAINTENANCE ................................................................................................14
4.1 General Maintenance Guidelines ........................................................................ 14
4.2 Filter Element Maintenance ............................................................................... 14
4.2.1 Particulate Filter Maintenance ..................................................................... 14
4.2.2 Coalescing Filter Maintenance ...................................................................... 16
4.3 Transmitter Maintenance................................................................................... 18
Appendices
Appendix A Technical Specifications.............................................................................. 21
Appendix B Quality, Recycling & Warranty Information................................................... 23
Appendix C Return Document & Decontamination Declaration........................................25
Figures
Figure 1 Replacement of HDPE Guard .....................................................................19

ES20 User’s Manual
vi 97447 Issue 2, December 2017
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.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
Refer to Appendix A, Technical Specifications.
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.
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 offices contact information.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Further
details of applied standards may be found in Appendix A, Technical Specifications.

ES20 User’s Manual
Michell Instruments vii
Abbreviations
The following abbreviations are used in this manual:
AC alternating current
barg pressure unit (=100 kP or 0.987 atm)
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
dp dew point
Hz Hertz
kg kilogram(s)
lb pound
Nl/min normal liters per minute
mA milliampere
max maximum
min minute(s)
% percentage
psig pounds per square inch
scfh standard cubic feet per hour
temp temperature
V Volts
W Watts
ΩOhms
Warnings
The following general warning listed below is applicable to this instrument. It is repeated
in the text in the appropriate locations.
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.

1 INTRODUCTION
Michell Instruments designs and manufactures a broad range of sampling systems for a
wide spectrum of industries and processes from the economical compressed air market
to the oil and gas process market.
The ES20 Compact Sampling System (CSS) is a standard modular product designed to
appeal to customers who require an economic system delivered for fast integration into
their own work package.
Fast delivery is achieved through a simple modular build system on a single base plate
design completed with supply chain stocking of all required ES20 CSS parts.
The ES20 CSS is a standard fast delivery product, covering a small portion of the
Michell Instruments’ overall sampling system and process analyzer sampling system
capabilities.
1.1 Materials
To ensure continuous and reliable dew-point or moisture measurement it is important
that the dew-point transmitter is exposed to stable conditions of the gas to be monitored.
The ES20 CSS utilizes high quality materials which ensure that the sample gas travels
smoothly through the system.
Gas wetted parts:
• Stainless steel tube, filter housing and fittings (316 stainless steel)
• Filter element (borosilicate glass microfibers)
• Transmitter sample block (316 stainless steel)
• Flowmeter (borosilicate glass) with Viton®seals
• Pump (Teflon®)
1.2 Filtration
If the gas contains impurities it is crucial to remove the contaminants before they reach
the sensing device. The ES20 CSS is supplied with a filter housing into which recyclable
particulate or coalescing filter cartridges can be inserted.
Filtration methods:
• Particulate filter (solid contaminants)
• Coalescing filter with adjustable drain (solid and liquid aerosol
contaminants)
• HDPE guard (filter) for sensing element (standard)
• Air filter (with vacuum pump (standard)

ES20 User’s Manual
Michell Instruments 1
INTRODUCTION
1.3 Pressure Control and Measurement
Pressure has a direct effect on dew point. The ES20 CSS utilizes a set of configurable
options for atmospheric or system line pressure dew-point measurement.
Pressure control features:
• Pressure gauge (dual scale: bar and psi)
• Isolation valves (needle valve type)
• Self-regulating vacuum pump
1.4 Flow Control
Flow rate of a gas can affect the transmitter’s accuracy and influence the systems’
response time. Every sampling system contains a set of components which help to
maintain optimum flows of 1 to 5 Nl/min (2.1 to 10.6 scfh).
Flow control:
• Flowmeter (with particulate or coalescing filter)
• Isolation valves (needle valve type)
• Flowmeter with needle valve (with vacuum pump only)
1.5 Mounting Variants
Depending on the application the sampling system can be supplied in 3 variations:
• Mounted on base plate
• Mounted on base plate inside a windowed GRP enclosure
• Mounted on base plate inside a windowed SS enclosure (316 stainless
steel)
1.6 System Designs
The ES20 CSS can be supplied in various configurations and can be used with many
Michell products and accessories such as:
• Easidew Transmitter
• Easidew I.S. Transmitter
• Easidew PRO I.S. Transmitter
• Easidew Online Hygrometer
• Cermet II Hygrometer
• Cooling or venting coil

ES20 User’s Manual
297447 Issue 2, December 2017
INTRODUCTION
1.7 System Configurations
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Components used Specifications
14 Flowmeter with needle valve Borosilicate glass (2 to 12 Nl/min), seals
(Viton®)
15 Vacuum pump Anti-overpressure mechanism (Teflon®)
16 Pressure gauge -1 to 1 barg
*In addition to particulate filter fitted components
Optional Dew-Point Measurement Device
Components used Specifications
17 Monitor
(to be ordered separately)** Refer to Monitor datasheet
18 Dew-Point Transmitter
(to be
ordered separately)**
Refer to Transmitter datasheet
ES20 CSS fitted with Coalescing Filter*
Components used Specifications
12 Drainage connection 6mm or ¼” fitting (316 stainless steel)
13 Coalescing filter (inside filter housing) Borosilicate glass microfibres (99.5+% removal
of 0.1 micron particles and aerosols)
*In addition to particulate filter fitted components
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Components used Specifications
1Base plate 316 stainless steel
2Inlet process connection and
material 6mm or ¼” fitting (316 stainless steel)
3Outlet process connection and
material 6mm or ¼” fitting (316 stainless steel)
4Isolation valve Needle valve type
5Filter housing 316 stainless steel (340 barg maximum),
gasket (Viton®)
6Particulate filter (inside filter
housing)
Borosilicate glass microfibres (99.5+% removal
of 0.1 micron particles)
7Pressure gauge 0 to 20 barg (dual scale: bar and psi)
8Sensor sample block 5/8” SS sample block (316 stainless steel)
9Flowmeter Borosilicate glass (2 to 12 Nl/min), seals
(Viton®)
10 Terminal rail 13 terminals
11 Process indicator mounting bracket
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ES20 User’s Manual
Michell Instruments 3
INTRODUCTION
1.8 Enclosure Configurations
Base Plate
350mm
2mm (D)
457mm
GRP Enclosure
530mm
430mm
200mm (D)
Stainless Steel Enclosure
500mm
400mm
200mm (D)

ES20 User’s Manual
497447 Issue 2, December 2017
INSTALLATION
2 INSTALLATION
2.1 Sampling System Installation
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel.
Relevant sections of this manual must be read in full before
commencing measurement (see below).
2.1.1 Relevant Manual Section for Installation
Please check below for the relevant product code structure and select the manual
section associated with the sampling system ordered.
NOTE: Compare the 2nd (Feature B - filter) and 4th (Feature D - pressure)
option from the ordered ES20 CSS product code with the table below:
Section 2.2 Section 2.3 Section 2.4
B1 - D1
Process or Atmospheric
Pressure
B2 - D1
Process or Atmospheric
Pressure
B1 - D2
Vacuum
Pressure

ES20 User’s Manual
Michell Instruments 5
INSTALLATION
2.2 Process or Atmospheric Pressure With Particulate Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
2.2.1 Mounting Details
The ES20 CSS base plate or enclosure is designed to be wall-mounted. It should be
rigidly mounted vertically in a position free from high vibration levels and shaded from
direct sunlight.
Dimensional drawings are shown in Section 1.8.
2.2.2 Gas Connections
Gas connections to the ES20 CSS are via 6mm or ¼” Swagelok®tube fittings located at
the base of the mounting plate or enclosure.
Connections are marked as follows:
GAS IN Sample gas entry point with a maximum supply pressure of 20 barg
(145 psig)
GAS OUT Sample gas exit point
Care must be taken to ensure that the outlet isolation valve is
not fully closed.
2.2.3 Electrical Connections
All electrical connections should be made to the terminal rail supplied in the sampling
system.
For GRP and SS housing versions - all cables to or from the sampling system should go
through the M20 plastic cable glands provided at the base of the enclosure.
2.2.4 Power Supply
NOTE: Refer to the label on the terminal rail for the supply voltage required
by the sampling system.
Go to Section 2.5 - Dew-Point Measurement System.

ES20 User’s Manual
697447 Issue 2, December 2017
INSTALLATION
2.3 Process or Atmospheric Pressure With Coalescing Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
2.3.1 Mounting Details
The ES20 CSS base plate or enclosure is designed to be wall-mounted. It should be
rigidly mounted vertically in a position free from high vibration levels and shaded from
direct sunlight.
Dimensional drawings are shown in Section 1.8.
2.3.2 Gas Connections
Gas connections to the ES20 CSS are via 6mm or ¼” Swagelok®tube fittings located at
the base of the mounting plate or enclosure.
Connections are marked as follows:
GAS IN Sample gas entry point with a maximum supply pressure of 20 barg
(145 psig)
GAS OUT Sample gas exit point
Care must be taken to ensure that the outlet isolation valve is
not fully closed.
2.3.3 Drainage Connections
Drainage connections to the ES20 CSS are via 6mm or ¼” Swagelok®tube fittings
located at the base of the mounting plate or enclosure.
2.3.4 Electrical Connections
All electrical connections should be made to the terminal rail supplied in the sampling
system.
For GRP and SS housing versions - all cables to or from the sampling system should go
through the M20 plastic cable glands provided at the base of the enclosure.
2.3.5 Power Supply
NOTE: Refer to the label on the terminal rail for the supply voltage required
by the sampling system.
Go to Section 2.5 - Dew-Point Measurement System.

ES20 User’s Manual
Michell Instruments 7
INSTALLATION
2.4 Vacuum Pressure With Particulate Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
2.4.1 Mounting Details
The ES20 CSS base plate or enclosure is designed to be wall-mounted. It should be
rigidly mounted vertically in a position free from high vibration levels and shaded from
direct sunlight.
Dimensional drawings are shown in Section 1.8.
2.4.2 Gas Connections
Gas connections to the ES20 CSS enclosure are via 6mm or ¼” Swagelok®tube fittings
located at the base of the mounting plate or enclosure.
Connections are marked as follows:
GAS IN Sample gas entry point with a maximum supply pressure of 1 bara (14.5
psia)
GAS OUT Sample gas exit point
Care must be taken to ensure that the outlet isolation valve is
fully open.
2.4.3 Electrical Connections
All electrical connections should be made to the terminal rail supplied in the sampling
system.
For GRP and SS housing versions - all cables to or from the sampling system should go
through the M20 plastic cable glands provided at the base of the enclosure.
2.4.4 Power Supply
NOTE: Refer to the label on the terminal rail for the supply voltage required
by the sampling system.
Go to Section 2.5 - Dew-Point Measurement System.

ES20 User’s Manual
897447 Issue 2, December 2017
INSTALLATION
The following procedures must be carried out by a qualified
installation engineer.
2.5 Dew-Point Measurement System
The dew-point measurement system is NOT supplied as standard.
A dew-point measurement system can be obtained by contacting your local distributor
or Michell Instruments (see www.michell.com for details).
NOTE: Refer to the relevant installation sections from the manual supplied
with Michell’s dew-point measurement system.
2.6 Monitor Installation
The monitor is NOT supplied as standard.
A monitor can be obtained by contacting your local distributor or Michell Instruments
(see www.michell.com for details).
NOTE: Refer to the relevant sections from the manual supplied with Michell’s
monitor.

ES20 User’s Manual
Michell Instruments 9
INSTALLATION
2.7 Process Connection
The following procedures must be carried out by a qualified
installation engineer.
2.7.1 Transmitter Connection
The transmitter cable is NOT supplied as standard.
A cable can be obtained by contacting your local distributor or Michell Instruments (see
www.michell.com for details).
NOTE: Please refer to the relevant sections from the manual supplied with
Michell’s product, e.g. Easidew Online.
2.7.2 Monitor Connection
Note: Please refer to the relevant sections from the manual supplied with
Michell’s product, e.g. Easidew Online or Easidew monitor.
2.7.3 Terminal Rail Connection
The transmitter cable can be directly connected to the terminal rail. In order to do that,
refer to terminal markings.
The transmitter requires a 12 to 28 V supply.
Make sure that the correct power supply is provided, otherwise
the transmitter can be damaged.

ES20 User’s Manual
10 97447 Issue 2, December 2017
OPERATION
3 OPERATION
3.1 Sampling Start-Up Procedure
The ES20 CSS is designed for continuous operation.
Immediately after the power is applied, all the electronic components, including the
dew-point transmitter, will begin operation and all measured output signals can be
viewed on a fitted monitor or wired to other receivers from the terminal rail.
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel.
Relevant sections of this manual must be read in full before
commencing measurement (see below).
3.1.1 Relevant Manual Section for Operation
Please check below for the relevant product code structure and select the manual
section associated with the sampling system ordered.
NOTE: Compare the 2nd (Feature B - filter) and 4th (Feature D - pressure)
option from the ordered ES20 CSS product code with the table below:
Section 3.2 Section 3.3 Section 3.4 Section 3.5 Section 3.6
B1 - D1
Process Pressure
with Particulate
Filter
B2 - D1
Process Pressure
with Coalescing
Filter
B1 - D1
Atmospheric
Pressure with
Particulate Filter
B2 - D1
Atmospheric
Pressure with
Coalescing Filter
B1 - D2
Vacuum Pressure
with Particulate
Filter

ES20 User’s Manual
Michell Instruments 11
OPERATION
3.2 Process Pressure With Particulate Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
3.2.1 Sample Flow 'Start-Up' Procedure
Proceed as follows:
1. Ensure the outlet isolation valve is fully CLOSED.
2. Open the inlet isolation valve slowly, making sure that the pressure
indicated on the pressure gauge does not exceed the maximum
operational pressure of 20 barg (290 psig). If achievable, ensure that the
inlet isolation valve is fully OPEN.
3. Adjust the outlet isolation valve, setting the sample gas flow rate to
approximately 5 Nl/min (10.6 scfh) (indicated on the flowmeter).
4. Allow the sample gas to purge the system for the period of time indicated
in the Good Measurement Practice Section (Stabilization Times).
3.3 Process Pressure with Coalescing Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
3.3.1 Sample Flow 'Start-Up' Procedure
Proceed as follows:
1. Ensure the outlet and drain isolation valves are fully CLOSED.
2. Open the inlet isolation valve slowly, making sure that the pressure
indicated on the pressure gauge does not exceed the maximum
operational pressure of 20 barg (290 psig). If achievable, ensure that the
inlet isolation valve is fully OPEN.
3. Adjust the outlet isolation valve, setting the sample gas flow rate to
approximately 5 Nl/min (10.6 scfh) (indicated on the flowmeter).
4. If necessary adjust the drain isolation valve to release excessive amount
of liquids from the filter housing.
NOTE: If required the drain isolation valve can be slightly OPEN. It
may be necessary to adjust the inlet and outlet isolation valves to
achieve normal operating conditions.
5. Allow the sample gas to purge the system for the period of time indicated
in the Good Measurement Practice Section (Stabilization Times).

ES20 User’s Manual
12 97447 Issue 2, December 2017
OPERATION
3.4 Atmospheric Pressure with Particulate Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
3.4.1 Sample Flow 'Start-Up' Procedure
Proceed as follows:
1. Ensure the outlet isolation valve is fully OPEN.
2. Open the inlet isolation valve making sure that the sample gas flow rate
is set to approximately 5 Nl/min (10.6 scfh) (indicated on the flowmeter).
3. Allow the sample gas to purge the system for the period of time indicated
in the Good Measurement Practice Section (Stabilization Times).
3.5 Atmospheric Pressure with Coalescing Filter
NOTE: All other options from the product configuration have no effect on the
operation described in this Section.
3.5.1 Sample Flow 'Start-Up' Procedure
Proceed as follows:
1. Ensure the outlet is fully OPEN and drain isolation valves are fully CLOSED.
2. Open the inlet isolation valve making sure that the sample gas flow rate
is set to approximately 5 Nl/min (10.6 scfh) (indicated on the flowmeter).
3. If necessary adjust the drain isolation valve to release excessive amount
of liquids from the filter housing.
NOTE: After adjusting the drain isolation valve it may be necessary
to adjust the inlet valve to achieve normal operating conditions
4. Allow the sample gas to purge the system for the period of time indicated
in the Good Measurement Practice Section (Stabilization Times).