Michell Instruments Easidew Online User manual

Easidew Online
Dew-Point Hygrometer
User’s Manual
97094NA Issue 16.2, December 2010 Michell Instruments
°Cdp
°Fdp

Inside front cover (blank)

Easidew Online User’s Manual
97094NA Issue 16.2, December 2010 iii Michell Instruments
© 2010 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.
Easidew Online
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°Fdp

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97094NA Issue 16.2, December 2010 iv Michell Instruments
Contents
Safety ..............................................................................................................................................vi
Electrical Safety.........................................................................................................................vi
Pressure Safety .........................................................................................................................vi
Toxic Materials ..........................................................................................................................vi
Repair and Maintenance.............................................................................................................vi
Calibration ................................................................................................................................vi
Safety Conformity......................................................................................................................vi
EC Declaration of Conformity.............................................................................................................vii
Abbreviations.................................................................................................................................. viii
Recycling Policy.................................................................................................................................ix
WEEE and RoHS Compliance.............................................................................................................. x
Calibration Facilities........................................................................................................................... x
Manufacturing Quality........................................................................................................................ x
Warranty ..........................................................................................................................................xi
Return Policy.....................................................................................................................................xi
1 INTRODUCTION........................................................................................................................ 1
2 DESCRIPTION........................................................................................................................... 2
2.1 Display........................................................................................................................... 2
2.2 Function Keys................................................................................................................. 4
2.3 Process Indicator Menu Structure..................................................................................... 5
2.3.1 Flowchart Reading Method .......................................................................................... 6
2.3.2 Flowchart Example ..................................................................................................... 7
3 INSTALLATION.......................................................................................................................... 8
3.1 Safety ............................................................................................................................ 8
3.2 Unpacking the Instrument ........................................................................................... 8
3.3 Easidew Components .....................................................................................................11
3.4 Operational Requirements ..............................................................................................12
3.4.1 Environmental Requirements – Process Indicator .........................................................12
3.4.2 Electrical Requirements ..............................................................................................12
3.5 Mounting the Process Indicator.......................................................................................12
3.6 Electrical Connections ....................................................................................................14
3.6.1 AC Power Supply Input...............................................................................................15
3.6.2 Preliminary System Test .............................................................................................16
3.6.3 DC Power Supply Input (Optional)...............................................................................17
3.6.4 Transmitter Connections.............................................................................................18
3.7 Signal Output Connections .............................................................................................19
3.8 Mounting the Sample Block and Transmitter ....................................................................21
3.8.1 Sample Block Gas Connections....................................................................................21
3.8.2 Transmitter Mounting - Sample Block ..........................................................................23
3.8.3 Transmitter Mounting - Direct Pipeline Connection........................................................25
4 OPERATION .............................................................................................................................26
4.1 General Operational Information ....................................................................................26
4.2 Preparation For Operation ..............................................................................................27
4.2.1 First Time Operation ..................................................................................................27
4.3. System Alarms...............................................................................................................28
4.3.1 Reversal of Default Alarm Switching Logic ...................................................................29
4.3.2 Set-up Alarm Levels ...................................................................................................31
4.3.3 CongureAnalogOutputCurrentLoop ........................................................................32
4.4. Change Dew-Point Temperature Range............................................................................33
4.4.1 Span and Unit Settings ..............................................................................................34
4.4.2 CongureAlarmSet-PointLimits .................................................................................35
4.4.3 Change Scale Units (to ppmV) .....................................................................................36
4.5 Set-Up Communications Parameters................................................................................38

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5 GOOD MEASUREMENT PRACTICE..............................................................................................40
5.1 General Operational Guidelines ......................................................................................41
5.2 Maintenance and Calibration ..........................................................................................43
5.2.1 Clean Process Indicator .............................................................................................43
Figures
Figure 1.1 Easidew Online process indicator and transmitter .......................................................... 1
Figure 2.1 Process indicator panel layout ...................................................................................... 2
Figure 2.2 Flowchart Example ...................................................................................................... 7
Figure 3.1 Unpacking method ...................................................................................................... 8
Figure 3.2 Transmitter unpacking method..................................................................................... 9
Figure 3.3 Accessories pack ......................................................................................................... 9
Figure 3.4 Process indicator........................................................................................................10
Figure 3.5 Easidew Online components........................................................................................11
Figure 3.6 Mounting the process indicator....................................................................................13
Figure 3.7 AC power supply connections......................................................................................15
Figure 3.8 DC power supply connections .....................................................................................17
Figure 3.9 Transmitter connections..............................................................................................18
Figure 3.10 Process indicator rear panel connections......................................................................19
Figure 3.11 Sample block gas connections.....................................................................................21
Figure 3.12 Transmitter mounting - sensor block............................................................................24
Figure 3.13 Transmitter mounting - pipe or duct ............................................................................25
Figure 4.1 Typical display............................................................................................................27
Figure 4.2 Change alarm switching logic......................................................................................30
Figure 4.3 Set-up alarm levels.....................................................................................................31
Figure 4.4 Congureanalogoutput .............................................................................................32
Figure 4.5 Span and unit settings................................................................................................34
Figure 4.6 Set-up alarm set-point limits .......................................................................................35
Figure 4.7 Set-up process indicator (to read ppm
V
).......................................................................37
Figure 4.8 Set-up data communications parameters .....................................................................39
Figure 5.1 Installation location ....................................................................................................41
Figure 5.2 Indication of dead space.............................................................................................41
Figure A.1 RS232 Connections ....................................................................................................51
Tables
Table 2.1 Process indicator front panel controls and indicators ........................................................ 3
Table 2.2 Function keys................................................................................................................ 4
Table 2.3 Flowchart symbols.........................................................................................................6
Table 3.1 Summary of electrical connections ................................................................................ 20
Appendices
AppendixA TechnicalSpecications................................................................................................ 45
AppendixB ULCertication............................................................................................................ 47
Appendix C Fahrenheit or Celsius ................................................................................................... 49
Appendix D RS232 Data Communications Port Connections (Optional) .............................................. 51
AppendixE ListofWorldwideMichellInstruments’Ofces ............................................................... 53

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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 limits are 100 V AC to 240 V AC,
47Hzto63Hz.RefertoAppendixA-TechnicalSpecications.
Pressure Safety
DONOTpermitpressuresgreaterthanthesafeworkingpressuretobeappliedtotheinstrument.Thespecied
safe working pressure (SWP), for this instrument is 45 MPa (450 barg / 6500 PSI) Refer to Appendix A -
TechnicalSpecications.
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
AppendixEfordetailsofMichellInstruments’worldwideofces’contactinformation.
Calibration
The recommended calibration interval for this instrument is 12 months unless it is to be used in a mission-
critical application or in a dirty or contaminated environment in which case the calibration interval should be
reduced accordingly. The instrument should be returned to the manufacturer, Michell Instruments Ltd., or one
of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU and US directives. Further details
ofappliedstandardsmaybefoundinAppendixA-TechnicalSpecications.

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EC Declaration of Conformity
EC Declaration of Conformity
We,
Michell Instruments Limited
48 Lancaster Way Business Park
Ely, Cambridgeshire
CB6 3NW. UK.
declare under our sole responsibility that the product
Easidew On-Line Hygrometer
to which this declaration relates is in conformity with the following standards
or other normative document(s)
EN61326-1:2006
Electrical equipment for measurement, control and
laboratory use –EMC requirements –Part 1:
General requirements.
following the provisions of
2004/108/EC
EMC Directive
Andrew M.V. Stokes, Technical Director
Date of Issue: 20 July 2009

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Abbreviations
The following abbreviations are used in this Manual:
AC alternating current
atm pressure unit (atmosphere)
bar pressure unit (=100 kP or 0.987 atm)
bara bar absolute
ºC degrees Celsius
ºF degrees Fahrenheit
DC direct current
ft foot (feet)
g gram(s)
Hz Hertz
“ inch(es)
kg kilogram(s)
lb pound
lbf-ft pound force per foot
l/min liters per minute
m meter(s)
mA milli Ampere
max maximum
min minute(s)
mm millimeter(s)
MPa megapascal (Pascals x106)
m/sec meters per second
Nm newton meter
ppmVparts per million (by volume)
RS232 serial data transmission standard
Rx receive
SCFH standard cubic feet per hour
SCFS standard cubic feet per second
SWP safe working pressure
sec second(s)
temp temperature
Tx transmit
V Volts
Ω Ohms

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Warnings
The following general warnings listed below are applicable to this instrument. They are 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.
Where this symbol appears in the following sections it is used
to indicate areas of potential risk of electric shock.
Recycling Policy
Michell Instruments is concerned with the protection of the environment. It is our commitment to reduce
and eliminate from our operations, wherever possible, the use of substances which may be harmful to the
environment. Similarly, we are increasingly using recyclable and/or recycled material in our business and
products wherever it is practical to do so.
The product that you have purchased may contain recyclable and/or recycled parts and we will be happy to
provide you with information on these components if required.

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WEEE and RoHS Compliance
The Waste Electronic and Electrical Equipment (WEEE) Directive, and the Restriction of Hazardous Substances
(RoHS) Directive place rules upon European manufacturers of electrical and electronic equipment. The
directives’ aim is to reduce the impact that electronic devices have on the environment.
Michell products are currently exempt from the RoHS directive, however all future products will be developed
entirely using compliant materials. Furthermore, Michell is taking active steps to remove non-compliant
materials and components from existing products wherever possible.
Michell is in full compliance with the WEEE Directive (Registration No. WEE/JB0235YW). Customers may be
required to return certain instruments for treatment at the end of their working life.
June 2010
Calibration Facilities
Michell Instruments’ calibration facilities are among the most sophisticated in the world and have been
recognized for their excellence.
Traceability to the National Physical Laboratory (NPL) UK is achieved through our UKAS Accreditation (Number
0179). This covers dew point over the range -90 to +90°C (-130 to +194°F) and also Relative Humidity.
Dew-point calibrations are also traceable to the National Institute for Standards & Technology (NIST) USA over
the range -75 to +20°C (-103 to +68°F).
NOTE:StandardtraceablecalibrationcerticatesforinstrumentsandsensorsarenotissuedunderourUKAS
accreditation.UKAScerticatesareusuallytospecialorderandareclearlyidentied.
Manufacturing Quality
Michell Instruments is registered with the British Standards Institute for Quality Assurance to:
BS EN ISO 9001: 2008
Rigorous procedures are performed at every stage of production to ensure that the materials of construction,
manufacturing,calibrationandnaltestproceduresmeettherequirementslaiddownbyourBSIapproved
Quality System.
Please contact Michell Instruments if the product does not arrive in perfect working order.

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Warranty
Unless otherwise agreed, the Supplier warrants that as from the date of delivery for a period of 12 months
the goods and all their component parts, where applicable, are free from any defects in design, workmanship,
construction or materials.
The Supplier warrants that the services undertaken shall be performed using reasonable skill and care, and of
a quality conforming to generally accepted industry standards and practices.
Except as expressly stated all warranties whether express or implied, by operation of law or otherwise, are
hereby excluded in relation to the goods and services to be provided by the Supplier.
All warranty services are provided on a return to base basis. Any transportation costs for the return of a
warranty claim shall reside with the Customer.
Return Policy
If a Michell Instruments’ product malfunctions within the warranty period, the following procedure must be
completed:
Notify a Michell Instruments’ distributor, giving full details of the problem, the model variant1.
and the serial number of the product.
If the nature of the problem indicates the need for factory service then the instrument should2.
be returned to Michell Instruments, carriage prepaid, preferably in the original packaging,
with a full description of the fault and the customer contact information.
Upon receipt, Michell Instruments will evaluate the product to determine the cause of the3.
malfunction. Then, one of the following courses of action will be taken:
If the fault is covered under the terms of the warranty, the instrument will be•
repaired at no cost to the owner and returned.
If Michell Instruments determines that the fault is not covered under the terms•
of the warranty, or if the warranty has expired, an estimate for the cost of
the repairs, at standard rates, will be provided. Upon receipt of the owner’s
approval to proceed, the product will be repaired and returned.

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1 INTRODUCTION
The Easidew Online dew-point hygrometer is an instrument designed for the continuous online measurement of
moisture content in non-corrosive gases, over an operational range of -100 to +20ºCdp (-148 to +68ºFdp).
Thesystemcomprisesaprogrammableprocessindicatorconguredtoaccepta4-20mAcurrentloopsignal
from an impedance-type dew-point temperature measurement transmitter. The span of the process indicator
is set to cover the dew-point range -100 to +20ºCdp (-148 to +68ºFdp) at operating pressures up to 45 MPa
(450 barg / 6500 PSI).
The process indicator also has a re-transmission facility which buffers the transmitter output for onward
transmissionto othersystems.Thetransmitterinputto the process indicator is conguredasa0-20 mA
currentloopsignalandthere-transmittedoutputcanbeconguredaseithera4-20mAora0-20mAcurrent
loop signal.
Two alarm outputs (high and low) are provided for connection to external systems. Alarm 1 provides a set
of single pole make contacts and Alarm 2 provides a set of changeover contacts. Both sets are potential free
and Alarm 1 contacts (single pole make) are rated at 250 V, 3 A and the Alarm 2 contacts (changeover) are
rated at 250 V, 5 A.
Figure 1.1 shows the process indicator and the transmitter.
°Cdp
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Figure 1.1 Easidew Online process indicator and transmitter

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2 DESCRIPTION
The controls and indicators associated with the Easidew Online are located on the front panel of the process
indicator.
Connections to the Easidew dew-point transmitter, the RS232 communications port and the external power
supply are all made to the rear panel of the process indicator (refer to Section 3).
Figure 2.1 shows the layout of these controls and Tables 2.1 and 2.2 describe their respective operational
functions.
Figure 2.1 Process indicator panel layout
2.1 Display
The instrument has a 4-digit display, set-up on delivery to display a dew-point temperature range of +20ºCdp
(+68ºFdp) (corresponding to a transmitter input of 20 mA), to -100ºCdp (-148ºFdp) (corresponding to a
transmitter input of 4 mA). Negative temperature readings are signed and positive temperature readings are
unsigned.
Temperature units are displayed by one of the two LED’s located to the left of the display. On delivery, ºCdp
isset-up.Ifrequired,theunitscanbechangedtoºF.ThemethodofconguringtheunitforºFisdescribed
in Section 4.4.
Optionally, the instrument can be set-up to read dew point in parts per million (ppmV), range 0 to 3000 ppmV . This
option requires the transmitter to be set-up for ppmVeither at the time of ordering or subsequently via Michell
application software. Note: No specic ppmVLED indicator is provided on the process indicator;
ppmVis selected if neither the ºCdp nor the ºFdp temperature indicators are illuminated.
Two temperature alarm indications are provided by two LEDs located on the right hand side of the display, AL1
(low) and AL2 (high). Access to the alarm relay contacts is provided on the rear panel. The connection for
these alarm relay contacts is shown in Section 3.7.
The operating temperature at which these alarm outputs operate is set-up as shown in Sections 4.3.2 and
4.4.2.

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Item Description
1
ºFdp
When illuminated, this LED indicates that the displayed dew-point reading is
in degrees Fahrenheit.
Note: If neither the ºFdp or ºCdp LED is lit, ppmVis selected.
2
ºCdp
When illuminated, this LED indicates that the displayed dew-point reading is
in degrees Celsius.
Note: if neither the ºCdp nor ºFdp LED is lit, ppmVis selected.
3
Main dew-point temperature display.
Flashes to alternately indicate ‘ErrL’ (error low) and temperature reading
for low temperatures over-range (lower than -100ºCdp (-148ºFdp) or
-129.9ºCdp (199.9ºFdp) for an open loop condition).
Flashes to alternately indicate ‘ErrH’ (error high) and temperature reading
for high temperature over-range.
4
AL1
When illuminated, this LED indicates that the dew-point temperature
programmed for Alarm 1 has exceeded the programmed threshold. Under
these conditions the alarm relay contacts associated with this alarm (normally
open) will change state (close) and will remain closed until the dew-point
temperature moves back within the programmed operational limit.
Alarm 1 is usually allocated to the Low alarm setting.
These relay contacts are rated at 250 V, 3 A and are connected as shown in
Section 3.7.
Section 4.3.2 describes the setting up of AL1 trip points.
5
AL2
When illuminated this LED indicates that the dew-point temperature
programmed for Alarm 2 has exceeded the programmed threshold. Under
these conditions the alarm relay changeover contacts associated with this
alarm will change state and will remain in this state until the temperature
moves back to within the programmed operational limit.
Alarm 2 is usually allocated to the High alarm setting.
These changeover relay contacts are rated at 250 V, 5 A and are connected
as shown in Section 3.7.
Section 4.3.2 details the setting up of AL2 trip points.
Table 2.1 Process indicator front panel controls and indicators

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2.2 Function Keys
The four function keys, located below the display, are used for setting up the process indicator.
The following set-up functions are covered in Section 4 of this Manual:
Reversal of alarm level switching logic•
Set-up alarm level trip points for AL1 and AL2•
Selection of temperature units•
Selection of re-transmission output current loop range, either 4-20 mA or 0-20•
mA
Set-up/change operating temperature range• or ppmVrange
The function key panel is shown in Figure 2.1 . Table 2.2 describes the operation of the keys.
Item Description
P
‘P’ (Program) key
This key is used to access the programming menus and to select sub-
menus within the list.
‘’ Left arrow (decrement) key
This key is used to access sub-menus and, within individual sub-menus, to
decrease the numeric value of the selected parameter.
‘’ Right arrow (increment) key
This key is used to access sub-menus and, within individual sub-menus, to
increase the numeric value of the selected parameter.
SET
‘SET’ key
Depending upon the context, this key is used to access the set value of the
selectedprocesseldandasan‘Accept’keyfornewparametervalues.
Table 2.2 Function keys

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2.3 Process Indicator Menu Structure
Once the Easidew Online is set-up it should not require much adjustment. The dew-point transmitter is
supplied calibrated over the range -100 to +20ºCdp (-148 to +68ºFdp) and has a linear output in the range of
4-20 mA (corresponding to -100ºCdp (-148ºFdp) and +20ºCdp (+68ºFdp) respectively).
Assupplied,theprocessindicatorisconguredtoacceptthis4-20mAinput,toindicatethemeasureddew-
pointtemperatureinºCandtogiveover-rangeindicationswithaashingdisplayiftheoperationallimitsare
exceeded.
Alarm level set-points are pre-set. The default settings are -20ºCdp for Alarm 1 and -40ºCdp for Alarm 2.
Formostapplicationsthedefaultparametersareusuallysufcientbutprogrammingfacilitieswithintheprocess
indicator permit the changing of some parameters.
These parameters, such as alarm levels, alarm switching logic, temperature units and analog re-transmission
current loop output range are set-up under a menu structure and are accessed by pressing the programming
key ‘P’on the process indicator’s control panel.
This Manual describes the functions relating to the
operational requirements of the Easidew Online
equipment and it is not recommended that menu
structures other than those described be entered.
NOTE: If a sub-menu is entered by mistake, quit by pressing the ‘P’ key until the main display is
restored. Never try to quit with the ‘SET’ key.
Section4describesthe set-upprocedures.TheowchartsshowninSection 4usethesymbolsfromTable
2.3.

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Symbol Description
Display reading / Indication
Outline is shown as solid green if the display is static
Display reading / Indication
Outlineisshownassolidredifthedisplayisashing
Display
Outline is shown as red, hatched to indicate that the display is
alternatelyashingbetweenthetwoindicatedvalues
Indicates the requirement to press the ‘P’ program key. Any
number next to the key indicates the number of times to press
the key, e.g. 6
Indicates the requirement to press the ‘SET’ key. Any number
next to the key indicates the number of times to press the
key, e.g. 6
Indicates the requirement to press the increment ‘’ key.
Indicates the requirement to press the decrement ‘’ key.
Table 2.3 Flowchart symbols
2.3.1 Flowchart Reading Method
Figure 2.2 showsatypicalowchartforsettingupthealarmswitchinglevelsandshowshowtochangethe
default settings for AL1 from -20ºCdp to -25.5ºCdp and for AL2 from -40ºCdp to -50ºCdp.
This,andallsubsequentowchartsinothersections,shouldbereadfromtoptobottom,lefttoright.
Further details on alarm settings are given in Section 4.

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2.3.2 Flowchart Example
SET SET
SET SET
SET
Set x2 for Alarm 2 only
Current
Value
Current
Value
Current
Value
New
Value
New
Value
New
Value
Main Display
P
P to exit if setting
Alarm 1 only
Main display
The following is a owchart example showing
the set-up of alarm levels. For actual set-up
instructions see Section 4.3.2.
The alarm set-point levels are set-up from the
program menu as follows: (To exit to the main
display without saving any new settings, press
the ‘P’ key.)
To set-up both alarm set-points
Press the ‘1. SET’ key once. ‘ALr1’ will be
displayed shown with a green outline to
indicate that the display is static. (To set
Alarm 2, press the ‘SET’ key two times and
follow the Alarm 2 branch instead).
Press the ‘2. ’ key to display the current Alarm
1 set-point (-20ºC in this example). This is
shownwitharedoutlineandisashing.
Use the ‘3. ’ and ‘’ keys to set the required
value (-25.5ºC in this example). This is
shownwitharedoutlineandisashing.
To exit to the main display without
saving any new setting, press the ‘P’
key.
Press the ‘4. SET’ key once to store the new (or
existing) value for Alarm 1 and to enter the
set-up menu for Alarm 2. ‘ALr2’ will now
be displayed. This is shown with a green
outline and is static.
Press the ‘5. ’ key to display the current Alarm
2 set-point (-40ºC in this example). This is
shownwitharedoutlineandisashing.
Use the ‘6. ’ and ‘’ keys to set the required
value (-50ºC in this example) This is shown
witharedoutlineandisashing.
Press the ‘7. SET’ key once to store the new
value for Alarm 2. The display will then
return to the main dew-point temperature
display.
Figure 2.2 Flowchart Example

Easidew Online User’s Manual
97094NA Issue 16.2, December 2010 8 Michell Instruments
3 INSTALLATION
3.1 Safety
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel
3.2 Unpacking the Instrument
The Easidew instruments and accessories are packed into a box and the method of unpacking is shown as
follows in Figure 3.1:
1
2
34
Figure 3.1 Unpacking method
Open the box and unpack carefully as follows. Save all the packing materials for the purpose of returning the
instrument for re-calibration or any warranty claims. Note that the packing method may vary slightly in the
U.S.
Remove the top packing (1)1.
Remove the dew-point transmitter box (3)2.
Remove the accessories pack (4)3.
Remove the process indicator box (2)4.

Easidew Online User’s Manual
Michell Instruments 9 97094NA Issue 16.2, December 2010
Unpack the dew-point transmitter box as follows (see Figure 3.2).
654321
Figure 3.2 Transmitter unpacking method
Remove the cap (1) from the packing tube (6). Remove the cover (2). Remove1.
the transmitter from the tube, complete with the body cover (4) and tip cover
(5).
Remove the body cover (4) and the tip cover (5) but leave the plastic protective2.
cover (3) over the probe tip in place.
The accessories pack is shown in Figure 3.3 .
1
2
3
4
Figure 3.3 Accessories pack
Remove the screwdriver (1), the two leads (2) and (3) and the sample block (4) from the bag.