Michell Instruments Easidew Portable Operating Manual
Easidew Portable
Standard Version
User’s Manual
97065 Issue 16.3
October 2019
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Easidew Portable
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www.michell.com
© 2019 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 Portable User’s Manual
Contents
Safety ................................................................................................................................ v
Electrical Safety ........................................................................................................... v
Pressure Safety ............................................................................................................ v
Toxic Materials ............................................................................................................. v
Repair and Maintenance ............................................................................................... v
Calibration ................................................................................................................... v
Safety Conformity ........................................................................................................ v
Abbreviations ......................................................................................................................vi
Warnings ............................................................................................................................vi
1 INTRODUCTION ................................................................................................1
2 INSTALLATION ..................................................................................................2
3 OPERATION ......................................................................................................3
3.1 General Operation .............................................................................................. 3
3.2 Atmospheric or Line Pressure Measurements ........................................................ 4
3.3 Measuring Dew Points Below -40°C (-40°F) .......................................................... 5
3.4 User Controls ..................................................................................................... 6
3.5 4–20 mA Output Socket Wiring ............................................................................ 7
4 GOOD MEASUREMENT PRACTICE .......................................................................8
5 MAINTENANCE ................................................................................................11
5.1 Calibration ....................................................................................................... 11
5.2 Sensor / Battery Replacement ........................................................................... 11
5.3 Filter Cartridge Replacement ............................................................................. 13
5.4 Checking the Easidew Portable Electronics Calibration ......................................... 13
5.5 List of Spares ................................................................................................... 13
5.6 Troubleshooting ................................................................................................ 14
Figures
Figure 1 Interchangeable Gas Inlet/Outlet Fittings .....................................................4
Figure 2 User Controls .............................................................................................6
Figure 3 Jack Plug Wiring .........................................................................................7
Figure 4 Material Permeability Comparison ................................................................8
Figure 5 2-Wire Connection - View Showing Rear of Connector Terminal Block ........... 13
Appendices
Appendix A Technical Specications .............................................................................. 16
Appendix B Quality, Recycling & Warranty Information ................................................... 18
Appendix C Decontamination Declaration ......................................................................20
iv 97065 Issue 16.3, October 2019
Easidew Portable 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
qualied personnel and 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 instrument is powered by an internally mounted
rechargeable battery. The input power supply voltage limits for the battery charger supplied with the
instrument are 90 to 264 V AC, 47/63 Hz.
NOTE: No battery charger unit other than that supplied with the instrument should be
used.
NOTE: Do not allow the battery to fully discharge.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specied safe working pressure is 20 barg (290 psig). Refer to the Technical Specications in
Appendix A.
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 oces contact information.
Calibration
The recommended calibration interval for the Easidew Portable is one year, unless otherwise
specied by Michell Instruments Ltd. The instrument should be returned to the manufacturer, Michell
Instruments, or one of their accredited service agents for re-calibration (go to www.michell.com for
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 the product specication.
Michell Instruments v
Abbreviations
!
The following abbreviations are used in this manual:
AC alternating current
atm pressure unit (atmosphere)
barg pressure unit (=100 kP or 0.987 atm) gauge
°C degrees Celsius
°F degrees Fahrenheit
dp dew point
ft feet
kg kilogram
lb pound
Easidew Portable User’s Manual
mA milliampere
m meter
mm millimeter
MPa megapascal
Nl/min normal liters per minute
psig pound(s) per square inch (gauge)
scfh standard cubic feet per hour
μm micrometer
Ω ohm
V Volts
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.
vi 97065 Issue 16.3, October 2019
Easidew Portable User’s Manual
1 INTRODUCTION
The Easidew Portable comprises an Easidew sensor tted into a sample block with
an integrated lter cartridge, and Legris push ttings on the gas inlet and outlet. The
measured dew point from the sensor is shown on the clear red LED display on the front
panel of the instrument.
The Easidew Portable can be supplied with either °C or °F dew-point measurement
units.
A 4-20 mA analog output is provided for connection to a chart recorder, data-logger or
computer system, so dew-point trends can be analyzed over time.
The electronics are housed in a rugged Peli case, providing NEMA 6 protection when the
lid is closed. The case is supplied with a lifetime guarantee.
INTRODUCTION
The Easidew Portable is powered by a rechargeable NiMH battery pack, giving between
12 and 16 hours of measurement time from a full charge. The instrument is delivered
complete with a universal battery charger stored in the lid. It takes 16 hours to fully
charge the battery pack, during which time the instrument can be switched on or
o. The charger is suitable to connect power to the instrument indenitely, but it is
recommended to allow the battery pack to go through a full charge-discharge cycle at
least once per month.
All Michell Ceramic Moisture Sensors are subject to a 13-point calibration, where their
performance is characterized against a fundamental reference hygrometer. This process,
and subsequent quality testing, ensures that all sensors behave optimally before they
are used in the eld. Each Easidew Portable is supplied with a calibration certicate
traceable to national standards (NIST) from Michell Instruments accredited laboratory.
Michell Instruments 1
INSTALLATION
2 INSTALLATION
On delivery, please check that all the following standard components are present in the
packing box:
• Easidew Portable
• 2m of 6mm O/D PTFE tube
• Battery charger
• Mains lead
• 3 pole ¼” jack plug (inside lid) - for analog output connections
• Certicate of calibration
Before using the Easidew for the rst time it is recommended that the battery pack is
charged for a minimum of 12 hours.
Easidew Portable User’s Manual
2 97065 Issue 16.3, October 2019
Easidew Portable User’s Manual
3 OPERATION
Maximum operating pressure is 20 barg (290 psig).
It is important that the gas ttings are correctly tightened, and
!
3.1 General Operation
To operate the Easidew Portable, follow these instructions:
any tubing is secure in the push ttings before use.
Failure to do so will aect the instrument's pressure rating.
OPERATION
1. Ensure that all gas ttings are fully tightened before use.
2. Gas under test should be restricted to ow rates between 1 and 5 Nl/min
(2 and 10.6 scfh) and pressures from atmospheric to 2 MPa (20 barg (290
psig)).
3. Connect the sample gas supply line to the instrument Gas In port.
4. Connect the sample gas vent line to the instrument Gas Out port.
5. Switch the instrument on. The display will begin to change as the sensor
responds to the applied dew point.
6. Allow the gas to ow until the display shows a stable reading. Typically
this would be around 15 to 30 minutes for spot checks at dew points of
-40°C (-40°F) and above.
7. Switch the unit o and disconnect the sample lines.
NOTE: Filters are essential for potentially dirty/contaminated gases – the
tted lter should be checked before and after use and replaced regularly - as
required.
Michell Instruments 3
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