Servomex AquaXact 1688 Manuel utilisateur

AquaXact 1688 Dew Point Transmitter

Operator Manual

2 © Servomex Group Limited 2017 AquaXact Issue 1.0

IMPORTANT INFORMATION

Continued safe and reliable operation of this equipment is conditional on all installation, operation and

maintenance procedures being carried out in accordance with the appropriate manuals, by personnel having

appropriate qualifications, experience and training. Failure to observe the requirements of the manual may result

in the user being held responsible for the consequences and may invalidate any warranty. Servomex accepts no

liability for unauthorised modifications to Servomex supplied equipment.

Servomex has paid particular attention to Health and Safety throughout this manual. Where special precautions

need to be taken due to the nature of the equipment or product, an appropriate safety icon and warning

message is shown. Special attention should be made to section 3 – Safety, where all such messages are

summarized.

This document, and all specifications and drawings within the document, are the property of Servomex, unless

agreed otherwise by contract, and are issued in strict confidence. They must not be reproduced, copied or

transmitted in any form, or by any means, or used as the basis for the manufacture or sale of apparatus,

programs or services without permission.

In line with our continuous policy of research and development, Servomex reserves the right to amend models

and specifications without prior notice, therefore the information in this document is subject to change without

notice and does not represent a commitment on the part of Servomex Group Limited. This handbook is accurate

at the date of printing, but will be superseded and should be disregarded if specifications or appearance are

changed. Check the internet for updates to the manual. The latest revision of this manual is available in Adobe

Acrobat format at www.servomex.com.

The customer agrees that in accepting and using this instrument Servomex’s liability arising from or in any way

connected with this instrument shall be limited exclusively to performing a new calibration or replacement or

repair of the instrument or sensor, at Servomex’s sole option, as covered by Servomex’s warranty. In no event

shall Servomex be liable for any incidental, consequential or special damages of any kind or nature whatsoever,

including but not limited to lost profits arising from or in any way connected with this instrument or items

hereunder, whether alleged to arise from breach of contract, express or implied warranty, or in tort, including

without limitation, negligence, failure to warn or strict liability.

Servomex is a registered trademark of Servomex Group Inc. The use of all trademarks in this document is

acknowledged.

North America:

Europe:

Representative:

Servomex Group Inc.

4 Constitution Way

Woburn MA 01801-1087

United States

Servomex Group Ltd

Jarvis Brook

Crowborough

East Sussex TN6 3FB

United Kingdom

t: +1 781 935 4600

+1 800 433 2552 (US toll free)

f: + 1 781 938 0531

e: americ[email protected]

w: www.servomex.com

t: + 44 (0) 1892 652 181

f: + 44 (0) 1892 662 253

e: europe_sales@servomex.com

w: www.servomex.com

AquaXact Issue 1.0 © Servomex Group Limited 2017 3

Contents

1Introduction ............................................................................................................................ 5

About this manual ........................................................................................................... 51.1

Product overview ............................................................................................................ 61.2

Product identification ....................................................................................................... 61.3

Ordering options ............................................................................................................. 61.4

2Unpacking............................................................................................................................... 7

3Safety ...................................................................................................................................... 8

Installation ....................................................................................................................... 83.1

Operation ........................................................................................................................ 93.2

Electromagnetic compatibility considerations .................................................................. 93.3

4Installation ............................................................................................................................ 10

Sensor installation ......................................................................................................... 104.1

Mechanical installation .................................................................................................. 134.2

Electrical installation...................................................................................................... 144.3

5Operation .............................................................................................................................. 16

Starting up .................................................................................................................... 16

5.1

6Technical specification ........................................................................................................ 17

Instrument ..................................................................................................................... 176.1

Sensor .......................................................................................................................... 186.2

Approvals / classifications ............................................................................................. 186.3

7Routine maintenance ........................................................................................................... 19

Preventative maintenance ............................................................................................. 197.1

8Troubleshooting ................................................................................................................... 20

Instrument ..................................................................................................................... 208.1

Sensor .......................................................................................................................... 218.2

9Storage and disposal ........................................................................................................... 23

Storage ......................................................................................................................... 239.1

Disposal ........................................................................................................................ 249.2

10 Spares ................................................................................................................................... 25

11 Warranty ............................................................................................................................... 26

Maintenance policy ....................................................................................................... 2711.1

Return Authorization Request ....................................................................................... 2711.2

4 © Servomex Group Limited 2017 AquaXact Issue 1.0

Appendix A Mechanical Drawings ......................................................................................... 29

A.1 Dew point transmitter .................................................................................................... 29

A.2 Sample block ................................................................................................................ 30

A.3 Sampling panel ............................................................................................................. 31

Appendix B Current vs. dew point ......................................................................................... 32

Appendix C Relationship of 4-20 mA output and instrument reading in ppmV or LBS ..... 34

Appendix D Uncertainty in LBS & ppmV calculations ......................................................... 35

Appendix E Sensor response time ........................................................................................ 36

E.1 AquaXact 1688 Calibration Options .............................................................................. 37

Index ............................................................................................................................................ 38

AquaXact Issue 1.0 © Servomex Group Limited 2017 5

1 Introduction

About this manual 1.1

1.1.1 Scope of the manual

This manual covers the installation, operation and routine maintenance of the AquaXact

1688 Dew Point Transmitter. It is intended for those already familiar with the installation,

use and maintenance of analytical or process instrumentation.

1.1.2 Safety information

Read this manual and make sure you fully understand its contents before you attempt to

install, use or maintain the device.

The following icons are used throughout this manual to identify any potential hazards that

could cause serious injury to people. Always follow the safety instructions and be aware of

the hazard.

This symbol warns of specific hazards which, if not taken into account,

may result in personal injury or death.

This symbol warns of specific hazards due to high voltages which, if not

taken into account, may result in personal injury or death.

This symbol warns of specific hazards due to high temperatures which, if

not taken into account, may result in personal injury or death.

This symbol warns of specific hazards due to hazardous substances

which, if not taken into account, may result in personal injury or death.

This symbol warns of specific hazards due to caustic or corrosive

substances which, if not taken into account, may result in personal injury

or death.

This symbol highlights where you must take special care to ensure the

equipment or property is not damaged.

1.1.3 Other information provided by the manual

Note:

Notes give extra information about the equipment.

Hint:

Hints give helpful tips and highlights information which is useful for you to be

aware of, for example, specific operating conditions.

6 © Servomex Group Limited 2017 AquaXact Issue 1.0

Product overview 1.2

The basic AquaXact 1688 dew point transmitter is a microprocessor based 4-20 mA loop-

powered hygrometer designed to measure moisture content in gases in a wide range from

-100 °C to +20 °C dew point in gases.

The measurement is transmitted by varying the current drawn (4-20 mA) from the power

supply, where the current varies in a proportional manner to the selected measurement

units.

In addition to the 4-20mA transmission a digital output can be used in conjunction with a

Servomex 1688 controller or MonoExact DF310E analyzer. Thus the AquaXact 1688 is

capable of communicating with properly equipped external computers or DCS systems as

well as the proprietary Servomex controllers. The AquaXact controller also allows field

span measurements and supports the field based sensor tip replacement process

(Appendix E). The AquaXact 1688’s advanced design allows it to be housed in a small

stainless steel enclosure behind the sensor probe making the transmitter and sensor a

single integrated unit.

The AquaXact 1688 uses the Servomex thin film Al2O3 technology sensor which is

encapsulated in sintered stainless steel making it compatible with a wide variety of

environments.

The sensor is a sensitive device and it should be handled accordingly.

Product identification 1.3

Figure 1-1: The AquaXact 1688 Dew Point Transmitter

Ordering options 1.4

For the latest ordering options please contact your local Servomex agent or visit

www.servomex.com.

AquaXact Issue 1.0 © Servomex Group Limited 2017 7

2 Unpacking

Read this manual carefully BEFORE you remove the AquaXact 1688 Dew

Point Transmitter from its box, or you attempt to install, commission or

use the equipment.

1. Examine the AquaXact package for damage or mishandling. If any damage is evident

notify the carrier and request an inspection.

2. Unpack the box. It should contain:

 Transmitter and sensor in desiccant container. The transmitter should be stored in

the desiccant container when not in use.

 Mating connector.

3. A USB memory stick with calibration files and an Adobe Acrobat file of this manual.

Check that you have received all of the items that you ordered. If any item is missing,

contact Servomex or your local Servomex agent immediately.

4. Inspect the items supplied, and check that they are not damaged. If any item is

damaged, contact Servomex or your local Servomex agent immediately.

5. Read section 3 – Safety before proceeding further.

Hint:

Keep the shipping documentation and packaging for future use, for example

when moving the equipment, or returning it for service or repair.

8 © Servomex Group Limited 2017 AquaXact Issue 1.0

3 Safety

The Servomex thin film Al2O3 sensor is designed and field proven to be highly reliable,

rugged and maintenance free. However the user should be aware of the following

precautions:

Installation 3.1

To avoid prolonged dry-down (when expecting to measure dew points

drier than -65 ºC), do not expose the sensor to room air longer than 1 - 2

minutes.

Do not open the desiccated sensor container before you are ready to

install the sensor.

The sensor container has desiccant to keep the sensor dry during

shipping and to avoid damage due to condensation. Close the container

using the attached red plug immediately after removing the sensor to

avoid degradation of the desiccant.

Do not throw away the sensor container. You may use it again to

transport the sensor between locations, to store it between uses or to

ship it back to the factory for certification. The container can be attached

to the loop cable, by trapping the cable with the lid strap.

Do not expose the sensor to corrosive gases or liquids such as ones

containing Chlorine, Ammonia or HCl. Cyanide, Br2, I2, NH3 and HNO3

may harm the gold layer of the sensor and limit the sensor life.

Do not expose the sensor to liquid water, as it may get damaged.

Do not breathe directly onto the sensor, as condensation may form

which could damage the sensor element.

Do not install the sensor near high heat sources such as radiators or air

ducts.

Do not install the sensor in places subject to extreme mechanical

vibration or shock.

Do not disassemble the porous metal filter encapsulation. This will

damage the sensor and void your factory warranty.

Before you install the probe, make sure that no contaminants are present

in the system (e.g. oil, liquid water).

AquaXact Issue 1.0 © Servomex Group Limited 2017 9

Operation 3.2

The AquaXact 1688 uses state-of-the-art microelectronics to provide a miniature full

functioning transmitter. The user should consider the following precautions when using any

sensitive electronic device:

Do not install the unit near heat sources such as radiators or air ducts.

Do not install the unit in places subject to extreme mechanical vibration

or shock.

Observe the appropriate electrical safety codes and regulations.

Electromagnetic compatibility considerations 3.3

The AquaXact 1688 has been designed and verified by testing to meet the requirements of

the EU EMC Directive 2014/30/EU, for Industrial, Scientific & Medical equipment. The

sensor and the 4-20 mA loop are electrically connected, however they are isolated from

the AquaXact 1688 housing and sample cell fitting threads. Please consider the following

electromagnetic interference issues during installation:

 In order to provide an acceptable noise environment for the AquaXact 1688 or any

other digital equipment in the proximity of switching inductive loads, it is recommended

that there be varistors placed across the inductors to keep down the high voltage spikes

during transitions.

 AC power wiring should be routed as far away from the AquaXact 1688 and its wiring

as practical.

4 Installation

Do not attempt to install, commission, maintain or use the AquaXact

1688 Dew Point Transmitter unless you are trained and know what you

are doing.

Follow the instructions in this section to safely install the AquaXact 1688

Dew Point Transmitter.

Do not install the unit in places subject to extreme mechanical vibration

or shock. If you do, sample measurements may not be accurate and the

transmitter may be damaged.

Sensor installation 4.1

The moisture content at the sensor is not only due to the moisture of the gas being

measured, but is also due to desorption of water from tubing, trapped moisture (at the

interconnection points, valves, filters and other hygroscopic materials in the system), leaks

in the system and others. As a result the measurement may vary from what is expected

and care should be taken in choosing the sampling approach utilized in the measurement.

Factors such as gas pressure, flow rate, materials of construction, length and diameter of

tubing, number of interconnecting fittings, dead space in tubing and manifolds will

influence the observed measurement value and response time.

The high-capacitance thin-film sensor can be installed either directly in the line to be

sampled (in-situ), or in a slip stream of a sample system (extractive). To assure a long and

accurate performance of the sensor, it should be protected from contaminants such as

liquids (water, oil etc.), and particulates. The sintered stainless steel sensor encapsulation

protects from particulates larger than 100 microns, finer particulates (e.g. from degraded

desiccant or rust) should be filtered with a particulate filter with suitable capability, do not

use hygroscopic filter materials.

4.1.1 In-situ installation

In-situ installation is recommended only for measurements where the gas pressure is

expected to be constant, the gas is expected to be free of contaminants, the gas

temperature is within the operating specifications of the sensor and there is no chance of

liquids coalescing. Examples of applications suited for in-situ installations are pure gases

or output of desiccant dryers (for instrument air), glove boxes, etc. For most other

applications in-situ installation should be avoided for the following reasons:

 Sample conditioning is almost always necessary to avoid exposure of the sensor to

liquid water and other contaminants, such as hydrocarbons, which may damage the

sensor or affect accuracy over time.

 If the gas line is under pressure, it is more likely that water condensation occurs which

may damage the sensor.

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