Michell Instruments Pura 2-Wire, Pura 3-Wire User Manual

Pura

Trace Moisture

2-Wire / 3-Wire / Digital Transmitter

User’s Manual

97070 Issue 12.1

March 2016

S

/

N

o

.

E

1

1

4

-

0

7

3

P

r

o

d

u

c

t

C

o

d

e

:

P

U

R

-

T

X

2

-

W

I

R

E

P

U

R

R

a

n

g

e

-

1

2



-

Please fi ll out the form(s) below for each instrument that has been purchased.

Use this information when contacting Michell Instruments for service purposes.

Transmitter

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Transmitter

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Transmitter

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

© 2016 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.

Pura 2-Wire / 3-Wire / Digital Transmitter

S

/

N

o

.

E

1

1

4

-

0

7

3

P

r

o

d

u

c

t

C

o

d

e

:

P

U

R

-

T

X

2

-

W

I

R

E

P

U

R

R

a

n

g

e

-

1

2



-

For Michell Instruments' contact information please go to

www.michell.com

Pura 2-Wire/3-Wire/Digital Transmitter

User’s Manual

iv

97070 Issue 12.1, March 2016

Contents

Safety ................................................................................................................................vi

Electrical Safety ...........................................................................................................vi

UL Approval .................................................................................................................vi

Pressure Safety ............................................................................................................vi

Toxic Materials .............................................................................................................vi

Repair and Maintenance ...............................................................................................vi

Calibration ...................................................................................................................vi

Safety Conformity ........................................................................................................vi

Abbreviations .....................................................................................................................vii

Warnings ...........................................................................................................................vii

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

1.1 Features ............................................................................................................ 1

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

2.1 Unpacking the Instrument ................................................................................... 2

2.2 Unpacking the Pura SEN ..................................................................................... 3

2.2.1 Unpacking Pura OEM-single bag, PREMIUM (PRM)-double bag versions ............ 3

2.3 Pura SEN ........................................................................................................... 4

2.4 Pura OEM, PRM .................................................................................................. 4

2.5 Preparation of the Transmitter Cable .................................................................... 5

2.6 Transmitter Mounting .......................................................................................... 6

2.6.1 Pura SEN - Sample Block (Optional) .............................................................. 6

2.6.2 Pura OEM & PRM Connection ......................................................................... 8

2.6.3 Pura SEN - Direct Pipeline Connection............................................................. 9

2.6.4 Transmitter Cable Connection ....................................................................... 10

3 OPERATION ....................................................................................................11

4 MAINTENANCE ................................................................................................12

5 FAULT CONDITIONS ........................................................................................13

Pura 2-Wire/3-Wire/Digital Transmitter
User’s Manual

Michell Instruments

v

Figures

Figure 1 Transmitter Unpacking Method ....................................................................3

Figure 2 Unpacking - Pura OEM & PREMIUM (PRM) - Single / Double Bag ...................3

Figure 3 Pura SEN ...................................................................................................4

Figure 4 Pura OEM, PRM ..........................................................................................4

Figure 5 Connector Terminal Block Removal ..............................................................5

Figure 6 Rear of Connector Terminal Block - 2-wire ....................................................5

Figure 7 Electrical Connections - 2-wire .....................................................................5

Figure 8 Rear of Connector Terminal Block - 3-wire ....................................................6

Figure 9 Rear of Connector Terminal Block - 4-wire ....................................................6

Figure 10 Sensor Block Connection .............................................................................7

Figure 11 Inlet/Outlet Identifi cation ............................................................................8

Figure 12 Transmitter Mounting - Pipe or Duct.............................................................9

Figure 13 Connector Installation ...............................................................................10

Figure 14 Installation Location .................................................................................11

Figure 15 Indication of Dead Space ..........................................................................11

Figure 16 SEN Dimensional Drawing .........................................................................16

Figure 17 OEM & PRM Dimensional Drawing..............................................................16

Appendices

Appendix A Technical Specifi cations ..............................................................................15

A.1 Dimensional Drawings ..................................................................16

Appendix B EU Declaration of Conformity......................................................................18

Appendix C Quality, Recycling & Warranty Information ...................................................20

C.1 Pressure Equipment Directive (PED) 97/23/EC ...............................20

C.2 Recycling Policy ..........................................................................20

C.3 WEEE Compliance ........................................................................20

C.4 RoHS2 Compliance ......................................................................21

C.5 Warranty .....................................................................................21

C.6 REACH Compliance ......................................................................22

C.7 Calibration Facilities .....................................................................22

C.8 Return Policy ...............................................................................23

C.9 Manufacturing Quality ..................................................................23

Appendix D Return Document & Decontamination Declaration ........................................25

Pura 2-Wire/3-Wire/Digital Transmitter

User’s Manual

vi

97070 Issue 12.1, March 2016

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.

UL Approval (2-wire version ONLY)

This product (2-wire version only) is UL approved within the operating temperature range of -20°C
to +60°C. The IP66 rating of this product is outside the scope of UL Approval, but this product has
been verifi ed as being IP66 by independent, UKAS accredited, 3rd party listing.

Pressure Safety

DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specifi ed safe working pressure is 24 MPa (240 barg / 3480 psig). Refer to Appendix A,
Technical Specifi 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. For
Michell Instruments’ contact information please go to www.michell.com.

Calibration

Periodic re-calibration is recommended in order to maintain the highest quality of measurement in
your application. Michell Instruments recommends that you have your Pura transmitter re-calibrated
annually unless it is used in a mission-critical application or in a contaminated environment, in which
case the calibration interval should be reduced accordingly.

Michell Instruments can offer a variety of re-calibration and exchange transmitter schemes to suit
your specifi c needs. Your local representative will be pleased to provide detailed, custom advice.

Safety Conformity

This product meets the essential protection requirements of the relevant EU directives. Further
details of applied standards may be found in the Technical Specifi cations, Appendix A.

Pura 2-Wire/3-Wire/Digital Transmitter
User’s Manual

Michell Instruments

vii

Abbreviations

The following abbreviations are used in this manual:

barg bar gauge
°C degrees Celsius
°F degrees Fahrenheit
dp dew point
DC direct current

fps feet per second
μm micro-meter
Nl/min normal liters per minute
mA milliampere
Mpa megapascal
m/sec meters per second
Nm Newton meter
psig pounds per square inch
ppm

V

parts per million by volume
RH relative humidity
scfh standard cubic feet per hour
V volts
Ω ohms

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.

Pura 2-Wire/3-Wire/Digital Transmitter
User’s Manual

Michell Instruments

1

INTRODUCTION

1 INTRODUCTION

The Pura Series of transmitters has been manufactured, tested and calibrated to
the highest available standards and should arrive in perfect working order, ready for
installation into a gas measurement application.

If there are any questions about the transmitter or how to install it, not detailed in
this Manual, contact your local representative. Refer to www.michell.com for details of
Michell Instruments’ worldwide offi ces’ contact information.

1.1 Features

The Pura Series are a continuous, on-line, 4-20 mA/digital transmitter family for the
measurement of moisture content in air and other non-corrosive gases.

Their key features are:

• Accuracy ±1°C dp

• 0.5°Cdp (0.9°Fdp) repeatability

• 2-wire connection - linear 4–20 mA signal

• 3-wire connection - linear 4-20 mA signal

• Digital transmitter - 4-wire connection - digital string signal (NOTE: only

works with the Pura AOL monitor)

• Operating pressure range - up to 24 MPa (240 barg / 3480 psig)

• Operating range - 120 to -40°Cdp (-184 to -40°Fdp)

• Moisture content ppm

V

(2-wire)

• Powered by any DC source from 12 to 28 V

Pura 2-Wire/3-Wire/Digital Transmitter

User’s Manual

2

97070 Issue 12.1, March 2016

INSTALLATION

2 INSTALLATION

2.1 Unpacking the Instrument

On delivery, check that all the following standard components are present in the packing
box:

Pura SEN (transmitter, no block version)

2-wire 3-wire Digital Transmitter

Calibration Certifi cate



Transmitter Connector



Connector Gasket



Round



Square



Square

97070 User’s Manual



Leak Test Certifi cate



VCR Seal
(for sample block)



Pura OEM / Pura PREMIUM (PRM)

2-wire 3-wire Digital Transmitter

Calibration Certifi cate



Transmitter Connector



Already Fitted



Already Fitted



Already Fitted

Connector Gasket



Round



Square



Square

97070 User’s Manual



Leak Test Certifi cate



NOTE: If any component is not present in the packing box, contact Michell
Instruments immediately.

NOTE: Packing tube and foam protectors are not needed for operation. Save
all the packing materials for the purpose of returning the instrument for re­calibration or any warranty claims.

Pura 2-Wire/3-Wire/Digital Transmitter
User’s Manual

Michell Instruments

3

INSTALLATION

2.2 Unpacking the Pura SEN

Unpack the dew-point transmitter packing tube as follows (see

Figure 1).

87645321

Figure 1

Transmitter Unpacking Method

1. Unscrew the cap (1) from the packing tube (8).

2. Remove the foam block (3) containing the connector (2).

3. Pull out the transmitter (5) from the tube, complete with the two foam
covers (6) and (7), the red protective cap (4) and the connector gasket
(3-wire or digital sensor only).

4. Remove the foam covers from the transmitter but leave the red plastic
protective cover (5), the red cap (4) and the connector gasket in place
until ready for installation.

NOTE: The transmitter sensing element is protected while in transit by a red
cover containing a small desiccant capsule. The connection pins are protected
by a red plastic cap. None of these plastic items are required for the operation
of the transmitter.

NOTE: Keep the connector (2) in a safe place until the transmitter is ready
for wiring.

2.2.1 Unpacking Pura OEM-single bag, PREMIUM (PRM)-double bag versions

Figure 2

Unpacking - Pura OEM & PREMIUM (PRM) - Single / Double Bag

Pura 2-Wire/3-Wire/Digital Transmitter

User’s Manual

4

97070 Issue 12.1, March 2016

INSTALLATION

2.3 Pura SEN

NOTE: For environmental and operating conditions, refer to Appendix A,
Technical Specifi cations.

Electrical connector

Transmitter cover

Transmitter label

Hexagonal nut

Process connection (½” VCR)

Sensing element

Figure 3

Pura SEN

2.4 Pura OEM, PRM

NOTE: For environmental and operating conditions refer to Appendix A,
Technical Specifi cations.

NOTE: The OEM and PRM transmitters are protected in transit by putting in a
plastic bag fi lled with nitrogen. The Pura OEM has single bag protection and
the Pura PRM has double bag protection.

Electrical connector
Transmitter cover
Transmitter label

Sensor block

Gas inlet (¼” VCR)
(see note below)

Gas outlet

(¼” VCR)

NOTE: The Pura has a uni-directional connection and must be
connected so the upstream flow is connected to the inlet port

of the Pura block (marked with a silver label).

INLET

Figure 4

Pura OEM, PRM