Michell Instruments Easidew Portable HP Manuel utilisateur

Easidew Portable

High Pressure Version

User’s Manual

97120 Issue 2.3

October 2019

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This document is the property of Michell Instruments Ltd and may not be copied or

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Easidew Portable HP

For Michell Instruments' contact information please go to

www.michell.com

Easidew Portable HP User’s Manual

iv 97120 Issue 2.3, October 2019

1 INTRODUCTION ................................................................................................1

2 INSTALLATION ..................................................................................................2

3 OPERATION ......................................................................................................4

3.1 General Operation .............................................................................................. 4

3.2 Measuring Dew Points Below -40°C (-40°F) .......................................................... 5

3.3 User Controls ..................................................................................................... 6

4 GOOD MEASUREMENT PRACTICE .......................................................................7

5 MAINTENANCE ................................................................................................10

5.1 Calibration ....................................................................................................... 10

5.2 Sensor / Battery Replacement ........................................................................... 10

5.3 Filter Cartridge Replacement ............................................................................. 12

5.4 Checking the Easidew Portable Electronics Calibration ......................................... 12

5.5 List of Spares ................................................................................................... 12

5.6 Troubleshooting ................................................................................................ 13

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

Appendices

Appendix A Technical Specications ..............................................................................15

Appendix B Quality, Recycling & Warranty Information ...................................................17

Appendix C Decontamination Declaration ......................................................................19

Figures

Figure 1 Swagelok® Fitting Instructions .....................................................................3

Figure 2 User Controls .............................................................................................6

Figure 3 Material Permeability Comparison ................................................................7

Figure 4 2-Wire Connection - View Showing Rear of Connector Terminal Block ...........12

Easidew Portable HP User’s Manual

Michell Instruments v

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

qualied 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 specied safe working pressure is 300 barg (4350 psig). Refer to the Technical Specications 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 oces contact information.

Calibration

The recommended calibration interval for the Easidew Portable is one year, unless otherwise

specied 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 specication.

Easidew Portable HP User’s Manual

vi 97120 Issue 2.3, October 2019

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

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.

Easidew Portable HP User’s Manual

Michell Instruments 1

INTRODUCTION

1 INTRODUCTION

The Easidew Portable comprises an Easidew sensor tted into a sample block with an

integrated lter cartridge, and Swagelok® tube couplings 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.

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 indenitely, 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. A calibration certicate traceable to UK National Physical Laboratory

(NPL) and the US National Institute of Standards and Technology (NIST) is provided

from Michell Instruments' accredited laboratory. The certicate shows 7 points of the

13-point calibration.

Easidew Portable HP User’s Manual

297120 Issue 2.3, October 2019

INSTALLATION

2 INSTALLATION

On delivery, please check that all the following standard components are present in the

packing box:

• Easidew Portable

• Swagelok® 6mm metering valve

• Swagelok® 6mm tube port adaptor

• Battery charger

• Mains lead

• 3 pole ¼” jack plug (inside lid)

• Certicate 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.

The supplied Swagelok® port adaptor needs to be assembled before the metering valve

can be connected to the instrument. See below:

1. Slip the nut over the

machined ferrule end of

the port connector

2. Insert the port connector

into the end connection and

finger-tighten the nut

3. While holding the fitting

body steady, tighten the

nut one-quarter turn

Do not use the Swagelok gap inspection

gauge with machined ferrule ends.

Easidew Portable HP User’s Manual

Michell Instruments 3

INSTALLATION

NOTE: Connect the machined ferrule end before

connecting the tube adaptor end

4. Insert the tube adaptor until it rests firmly on

the shoulder of the Swagelok®tube fitting body.

Finger-tighten the nut.

5. Mark the nut at the 6 o’clock position. While holding

the fitting body steady, tighten the nut 1¼turns to the

9 o’clock position.

September 2010, R4 MS-12-12

Figure 1

Swagelok® Fitting Instructions

Easidew Portable HP User’s Manual

497120 Issue 2.3, October 2019

OPERATION

3 OPERATION

Maximum operating pressure is 300 barg (4350 psig).

It is important that both the gas ttings and the Swagelok®

tube ttings are correctly tightened before use.

Failure to do so will aect the instrument's pressure rating.

3.1 General Operation

To operate the Easidew Portable, follow these instructions:

1. Ensure that both the gas ttings and the Swagelok® tube ttings are fully

tightened before use.

2. For measurement at line pressure, connect the supplied metering valve to

the outlet of the instrument. For measurement at atmospheric pressure,

connect the metering valve to the inlet.

3. 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 30 MPa (300 barg

/ 4350 psig).

4. Connect the sample gas supply line to the instrument Gas In port.

5. Connect the sample gas vent line to the instrument Gas Out port.

6. Switch the instrument on. The display will begin to change as the sensor

responds to the applied dew point.

7. 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.

8. Switch the unit o and disconnect the sample lines.

!Before disconnecting the Easidew Portable from the gas line

it is essential to vent the system to atmospheric pressure,

otherwise severe injury could result.

NOTE: Filters are essential for potentially dirty/contaminated gases – the

tted lter should be checked before and after use and replaced regularly, as

required.

NOTE: The High Pressure version features two gas ttings with 4mm orices

that give no restriction and are engraved with a number 1. Atmospheric or

line pressure measurement is achieved by changing the positioning of the

metering valve as per the General Operation instructions above.

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