Pyropress PYRP-28 Manuale utente

DTR.PYRP.PYRD.PYRL-28.

INSTALLATION, OPERATION

AND MAINTENANCE MANUAL

PRESSURE TRANSMITTERS

PYRP-28, PYRP-28IS

DIFFERENTIAL PRESSURE TRANSMITTERS

PYRD-28, PYRD-28IS

HYDROSTATIC LEVEL TRANSMITTER PROBES

PYRL-28, PYRL-28IS

JULY 2012

Rev. C

The Pyropress Engineering Company Limited.

Bell Close, Newnham Industrial Estate, Plympton,

Plymouth, Devon, United Kingdom PL7 4JH

Tel: +44 (0) 1752 333933 Fax: +44 (0) 1752 336681

Email: sales@pyropress.com Website: www.pyropress.com

DTR.PYRP.PYRD.PYRL-28

Symbols used

BASIC REQUIREMENTS AND SAFE USE

- The manufacturer is not responsible for any damage to property or personnel resulting

from incorrect installation, failure to maintain the product in a suitable condition, or use

of the product other than for its intended purpose.

- Installation should be carried out by qualified personnel having the required authorisation to

install electrical and pressure measuring devices. The installer is responsible for performing

the installation in accordance with these instructions and with the electromagnetic compatibility

and safety regulations and standards applicable to the type of installation.

- If a product is deemed to be not functioning correctly, disconnect it and send it for repair to the

manufacturer or to a firm authorised by the manufacturer.

To minimise the risk of malfunction and associated risks to personnel, the product is not to be

installed or used in particularly excessive arduous conditions, where the possibility of the

following hazards may be present.

- Possibility of mechanical impacts, excessive shocks and vibration;

- Excessive temperature fluctuation,

- Condensation of water vapour, dust, icing.

The installation of intrinsically safe versions should be carried out in accordance with the latest

hazardous area installation regulations and standards.

The manufacturer reserves the right to make any product changes (not having a negative impact on

the operational parameters of the products) without updating the contents of the technical manual.

Symbol

Description

Warning –Installer to proceed strictly in accordance with the information contained

within the manual in order to ensure the safety and full functionality of the product.

Denotes information applicable during installation and operation of all listed products.

Denotes information essential to Exia certified products.

Denotes information on disposal of used equipment

DTR.PYRP.PYRD.PYRL-28

CONTENTS

1. INTRODUCTION............................................................................................................................................. 3

2. CONSIGNMENT CONTENTS.......................................................................................................................... 3

3. APPLICATIONS AND MAIN FEATURES........................................................................................................ 3

4. IDENTIFYING MARKS. ORDERING PROCEDURE ........................................................................................ 4

5. TECHNICAL DATA......................................................................................................................................... 4

5.1. PYRP–28. TECHNICAL DATA ....................................................................................................................... 4

5.1.1. PYRP–28. MEASUREMENT RANGES..........................................................................................................................4

5.1.2. PYRP–28. OPERATING PARAMETERS........................................................................................................................4

5.2. PYRD–28. TECHNICAL DATA ....................................................................................................................... 5

5.2.1. PYRD–28. MEASUREMENT RANGES..........................................................................................................................5

5.2.2. PYRD–28. OPERATING PARAMETERS .......................................................................................................................5

5.3. PYRP-28, PYRD-28.- COMMON PARAMETERS .............................................................................................. 5

5.3.1. PYRP–28, PYRD–28 .ELECTRICAL PARAMETERS....................................................................................................5

5.3.2. PYRP–28, PYRD–28. PERMITTED ENVIRONMENTAL CONDITIONS..............................................................................5

5.3.3. PYRP–28, PYRD–28. CONSTRUCTION MATERIALS...................................................................................................6

5.4. PRESSURE CONNECTORS............................................................................................................................. 6

5.4.1. PYRP–28. PRESSURE CONNECTORS.........................................................................................................................6

5.4.2. PYRD–28. PRESSURE CONNECTORS ........................................................................................................................6

5.5. PYRP–28,PYRD–28ELECTRICALCONNECTORSANDIPRATING.......................................................................... 6

6. CONSTRUCTION............................................................................................................................................ 6

6.1. MEASUREMENT PRINCIPLES ......................................................................................................................... 6

6.2. CONSTRUCTION........................................................................................................................................... 6

6.3. CASING,ELECTRICAL CONNECTIONS............................................................................................................. 7

7. INSTALLATION LOCATION OF TRANSMITTERS ......................................................................................... 8

7.1. GENERAL NOTE ........................................................................................................................................... 8

7.2. LOW AMBIENT TEMPERATURE....................................................................................................................... 8

7.3. HIGH PROCESS TEMPERATURES. .................................................................................................................. 8

7.4. MECHANICAL VIBRATION,CORROSIVE MEDIA................................................................................................. 8

8. INSTALLATION AND MECHANICAL CONNECTIONS................................................................................... 9

9. ELECTRICAL CONNECTION.......................................................................................................................... 9

9.1. GENERAL RECOMMENDATIONS...................................................................................................................... 9

9.2. CONNECTIONS FOR TRANSMITTERS WITH PD-TYPE CONNECTOR..................................................................... 10

9.3. CONNECTIONS FOR TRANSMITTERS WITH PK OR PM12-TYPE CONNECTOR...................................................... 10

9.4. CONNECTIONS FOR TRANSMITTERS WITH TERMINAL BOX (PZ-TYPE CONNECTOR)............................................. 10

9.5. PROTECTION FROM OVER VOLTAGE ............................................................................................................. 10

9.6. EARTHING................................................................................................................................................. 11

10. ZERO AND RANGE (SPAN) ADJUSTMENT............................................................................................... 11

11. SERVICES AND SPARE PARTS. ............................................................................................................... 11

11.1. PERIODIC SERVICE................................................................................................................................... 11

11.2. UNSCHEDULED SERVICES ......................................................................................................................... 11

11.3. CLEANING THE DIAPHRAGM AND OVERLOAD DAMAGE................................................................................. 11

11.4. SPARE PARTS.......................................................................................................................................... 12

12. PYRL-28 LEVEL PROBES.......................................................................................................................... 12

12.1. APPLICATIONS......................................................................................................................................... 12

12.2. PYRL–28. TECHNICAL DATA.................................................................................................................... 12

12.3. PRINCIPLES OF OPERATION,CONSTRUCTION.............................................................................................. 12

12.4. INSTALLATION AND FITTING ..................................................................................................................... 12

12.5. ELECTRICAL CONNECTION.SETTINGS ........................................................................................................ 13

12.6. EARTHING............................................................................................................................................... 13

13. PACKING, STORAGE AND TRANSPORT.................................................................................................. 13

14. GUARANTEE.............................................................................................................................................. 13

15. ADDITIONAL INFORMATION..................................................................................................................... 13

15.1. RELATED DOCUMENTS.............................................................................................................................. 13

15.2. RELATED STANDARDS.............................................................................................................................. 13

16. FIGURES (DIAGRAMS) .............................................................................................................................. 14

APPENDIX 01 (FOR INTRINSICALLY SAFE ATEX CERTIFIED VERSIONS) .................................................. 27

DTR.PYRP.PYRD.PYRL-28

1. INTRODUCTION

1.1. This manual covers the PYRP–28 pressure transmitter, PYRD–28 differential pressure transmitter and

PYRL–28 hydrostatic level probe, and contains all the necessary information and guidelines to understand their

functioning and how to correctly put them to work. It includes instructions and recommendations concerning their

installation and use.

1.2. The transmitters comply with the requirements of all the relevant EU directives and this is indicated on the

transmitter labelling and the relevant Declaration of Conformity.

1.3. Additional data relating to the ATEX certified Intrinsically Safe versions PYRP-28IS, PYRD-28IS

transmitters and PYRL-28IS level probes is provided under the appendix (see page 27).

This appendix must be referred to during the installation and putting to work of these transmitters.

2. CONSIGNMENT CONTENTS

Transmitters are delivered in single and/or multiple packs.

A single batch of transmitters will be supplied with a copy of this manual (more can be supplied on application)

If requested at the ordering stage Calibration Certificates for each transmitter or a common Certificate Of

Conformity can be supplied and will accompany the goods.

Non order specific documentation/certificates such as ATEX, SIL 1, PED etc. would be provided when applicable

(these can also be downloaded from us at www.pyropress.com)

3. APPLICATIONS AND MAIN FEATURES

3.1. The PYRP-28 pressure transmitters are designed to measure gauge pressure, vacuum pressure and

absolute pressure of gases, vapours and liquids that are compatible with the wetted parts material.

3.2. PYRD–28 differential pressure transmitters are designed to measure the difference between two separate

inputted pressures on applications such across filters (blocked filter monitoring), orifices (liquid or gas flow

monitoring) or liquid levels in closed tanks.

PYRD–28 differential pressure transmitters with N4,GA,GB or P connections are suitable for a maximum static

pressure 40 Bar (see fig.7 –typical representation only).

PYRD–28 differential pressure transmitters with C type manifold connection blocks are suitable for a maximum

static pressure of 250 Bar (320 Bar and 420 Bar options available) (see fig.8).

3.3. The PYRP-28 and PYRD–28 can be fitted with a range of additional process connectors and/or

isolating seals enabling them to be used on various challenging media, such as high viscosity,

reactive/corrosive to standard wetted parts, and temperature extremes (high and low) etc.

Data on these options and ancillary items can be found in a separate technical literature.

3.4. For depth measurements in open tanks the PYRL-28 hydrostatic level probe variant would be used, this is a

pressure transmitter fitted with sensing modules with an extension tube to suit the depth of level required. (see

Section 12).

3.5. The PYRP-28 or PYRD-28 transmitters and the PYRL-28 probes provide a 2 wire, 4 - 20mA output signal.

Alternatively, the PYRP-28 and PYRD-28 can as an supplied with either a 3 wire, 0 - 20mA or 0 - 10V output

signal.

DTR.PYRP.PYRD.PYRL-28

4. IDENTIFYING MARKS. ORDERING PROCEDURE

4.1. Every transmitter and probe supplied is fitted with an information label containing at least the following:

CE mark, notified body certificate references/codings, Pyropress’ name, transmitter model no., unique serial

number, measurement range, output signal and power supply voltage.

Additionally, Intrinsically Safe certified versions would have the full ATEX markings as detailed in the Appendix

(see page 27).

5. TECHNICAL DATA

5.1. PYRP–28 Pressure Transmitter Technical Data

5.1.1. PYRP–28 Measurement Ranges

The PYRP-28 pressure transmitter can be supplied specifically calibrated with any desired range contained within

the below spans:

Gauge pressure : 0 - 10 mbar to 0 - 1000 Bar

Absolute pressure : 400mbar to 80bar.

Recommended standard ranges:

Gauge pressure : 0 to -1; -0,4; -0,1; 0,1; 0,4; 1; 2,5; 6; 10; 16; 25; 60; 160; 250; 400, 600, 1000 Bar

Absolute pressure : 0 to 0,4; 1; 2,5 6; 10; 16; 25; 60 Bar

5.1.2. PYRP–28 Operating Parameters

Table 1

Measurement Range

100 mBar

400 mBar

0 - 1 to 1000 Bar

Overpressure limit

(repeatable, no hysteresis)

1 Bar

2.5 Bar

4 x range

Max 1200 Bar

Burst pressure

2 Bar

5 Bar

8 x range,

Max 2000 Bar

Accuracy

0.3%

0.2% (0.16 % - special version)

Thermal error

Typically 0.3% / 10º C; Max 0.4% /10º C

Typically 0.2% /10º C; Max 0.3% /10º C

Long term stability

0.2 % / year

0.1 % / year

Hysteresis and repeatability

0.05%

DTR.PYRP.PYRD.PYRL-28

5.2. PYRD–28 Differential Pressure Technical Data

5.2.1. PYRD–28 Measurement Ranges

The PYRD–28 differential pressure transmitters can be supplied specifically calibrated with any desired range

contained within the spans of 0 - 16mbar to 0 - 25 bar.

Recommended standard ranges: 0.4; 1; 2,5; 6; 10; 16; 25 Bar

(-0,1 to + 0,1); (-1.0 to +1.0) Bar

5.2.2. PYRD–28 Operating Parameters

Table 2

Parameters

Measurement Ranges

100 mBar

1 Bar

2 Bar

25 Bar

Overpressure limit

Static pressure limit

C type connection: 250 Bar - (320 and 420 Bar option)

N4, GA, GB and P Type connection : 40 Bar

Accuracy

0.4%

0.25%

Long term stability

0.2%/year

0.1%/year

Thermal error / 10C

typical 0.3%/10°C

max 0.4%/10°C

typical 0.2%/10°C,

max 0.3%/°C

Zero shift error for static pressure *

0.1% / 10 Bar

Hysteresis and repeatability

0.05%

*- This error can be eliminated by zeroingthe transmitter instatic pressure conditions with zero differential pressure.

5.3. PYRP-28 Pressure and PYRD-28 Differential Pressure Transmitters -

Common Parameters

5.3.1. Electrical Parameters

Power supply 10.5 - 36V DC, nominally 24V DC (2 wire, 4 - 20mA version)

15 - 30V DC (3 wire, 0 - 10V or 0 - 20mA version)

Note: For power supply for Intrinsically Safe versions see Appendix 01 of this manual.

Output signal 4 - 20mA two-wire transmission

0 - 10 V three-wire transmission

0 - 20 mA three-wire transmission

Error due to supply voltage changes 0.005 % /V

Load resistance

(for 4 - 20mA version)

Load resistance

(for 0 - 10V and 0 –20mA versions R ≥ 5kΩ

Error due to supply voltage changes 0.005 %/V

Voltage for insulation strength testing 500 VAC or 750 VDC, see p.9.5.

Excess voltage protection see Point 9.5 (page 10)

5.3.2. PYRP–28, PYRD–28. Environmental Condition Limitations

Ambient temperature limit -40 to +80°C (for PYRP-28)

Ambient temperature limit -25°C to +80°C (for PYRD-28)

(For ambient temperature limits for Intrinsically Safe versions see Appendix 01.

Process temperature limit -40 to +120°C –direct measurement of process.

For temperatures in excess of 120ºC a diaphragm seal,

radiator, looped siphon tube or impulse line must be used.

Thermal compensation range -10 to +80ºC (for PYRP-28) or special by arrangement

Thermal compensation range 0 - 70ºC (for PYRD-28) or special by arrangement

R[Ω] =

Usup.[V] –10.5V

0.02A

DTR.PYRP.PYRD.PYRL-28

Relative humidity 0 - 98%

Vibration during operation Max 4g

5.3.3. Construction Materials

Diaphragm Stainless steel 316L

(Hastelloy C-276 option on pressure transmitter only)

Sensing module Stainless steel 316L

Casing for electronic parts Stainless steel 304

PZ-type terminal box Stainless steel 304

Angular connector, DIN 43650, PD type Itamid

Internal sensor liquid fill Silicone oil, chemically inactive liquid for measurement of

oxygen.

Cable shield in PK connector Polyurethane, special version –Teflon

5.4. Pressure Connectors

5.4.1. PYRP–28. Pressure Connectors

M & MG-type connector with M20x1.5 thread –see figure 3a

P & PH -type connector with M20x1.5 thread –see figure 4a.

T, TH or MF-type connector with flush diaphragm –see figure 5a.

RM-type connector with M20x1.5 thread and radiator –see figure 3a

RG-type connector with G1/2” thread – see figure 6a

GB or GH -type connector with G1/2” thread – see figure 6a

GF-type connector with G1/2” thread and flush diaphragm –see figure 6c

GD-type connector with G1” thread and flush diaphragm – see figure 6e

N2-type connector with 1/2"NPT thread (male) and with internal G1/4” thread (female).

X-type Diaphragm seal –refer to literature

Other connection types by arrangement

5.4.2. PYRD–28. Pressure Connectors

Type N4 - ¼” NPT F, Type GA –G¼, Type GB –G½, Type P –M20 x 1.5 M type see typical representation fig.7.

C type connection for direct mounting with a 3 or 5 valve manifold see Fig. 8.

5.5. PYRP–28 and PYRD–28 Electrical Connectors and IP Ratings.

PYRP-28, PYRD-28 with PD-type connector, DIN 43650, PG-11 gland. IP65 rated (EN 60529:1991/A1:2000)

PYRP-28, PYRD-28 with PZ-type terminal box, M20x1,5 packing gland. IP66 rated (EN 60529:1991/A1:2000)

PYRP-28, PYRD-28, PYRL-28 with PK-type cable connector. IP67 rated (EN 60529:1991/A1:2000)

PYRP-28 with PM12-type connector. IP67 rated (EN 60529:1991/A1:2000)

6. CONSTRUCTION

6.1. Measurement Principles

The PYRP-28, pressure transmitters, PYRD-28 differential pressure transmitters and the PYRL-28 level probes

operate by converting changes in the piezoresistive bridge, which are proportional to the measured pressure, into

a standard current or voltage output signal.

The active sensing device is a silicon diaphragm with diffused piezoresistors, separated from the medium by an

isolating diaphragm and oil.

6.2. Construction

The basic component of the transmitter and probe is the sensing module, in which the input pressure is converted

into an electrical signal. The sensing modules are fitted with process connections (see para. 5.4). The second

element of the transmitter is an electronic unit which amplifies and conditions the output signal. This is fitted with

potentiometers which can be used to set the zero and the range positions.

For the measurement of dense, chemically reactive, or high temperature media, the transmitters are fitted

additionally with various types of diaphragm seal connectors, depending on the type of medium and

environmental conditions (details can be found within separate literature).

DTR.PYRP.PYRD.PYRL-28

6.3. Casing and Electrical Connections

6.3.1. The casing of the PYRP-28 and PYRD-28 transmitters is manufactured from ø27 tube (304 st steel or 316

st. steel), fixed to the the sensing module as shown in figure 1b and 7. At the electrical connection end is the PD

type electrical connector with PG-11 packing gland. By loosening the fixing screw and removing the connector

access can be gained to the potentiometers for zero and span adjustments.

6.3.2. The PYRP-28, PYRD-28 transmitters may be fitted with a PK cable connector (see figure 1c) or PM12

(PYRP-28 only) (see figure 1f), mounted similarly to the PD connector. The body of the connector contains a

permanently fixed and sealed cable of standard length 3m (other lengths can be supplied to order). The cable

contains a capillary which references the non media side of the measuring diaphragm to atmosphere.

6.3.3. The PYRP-28, PYRD-28 transmitters with a PZ type connector has a terminal box permanently mounted

on the upper part of the casing (figure 2). The box is sealed with a threaded a lid. Mounted internally are

terminals marked 1, 2 and 3.

PZ type terminal housing has an internal earth terminal, whilst the Intrinsically Safe certified version also has an

external earthing terminal.

DTR.PYRP.PYRD.PYRL-28

7. INSTALLATION LOCATION OF TRANSMITTERS

7.1. General note

7.1.1. The PYRP-28 transmitters can be installed both indoors and outdoors. It is recommended that transmitters

with DIN type electrical connectors (PD and PM12) intended for outdoor use be provided with an additional form

of mechanical protection.

There is no need for a cover in the case of transmitters with PZ and PK type connectors.

7.1.2. The location of the installation should be selected to both allow easy access to the transmitter but also to

ensure it cannot be subjected to accidental mechanical damage. In planning the installation of the transmitter and

configuration of the impulse lines, consideration should be given to the following requirements:

- The impulse lines should be as short as possible, with a sufficiently large cross-section, and be free of

sharp bends, in order to prevent blockages;

- Where the medium is a gas, the transmitters should be installed above the measuring point ensuring

any condensation flows down towards the tapping point. Where the medium is a liquid or where a

diaphragm seal is used, the transmitters should be installed below the tapping point.

- The impulse lines should be inclined at a gradient of at least 10cm/M

- The levels of filling liquid in the impulse lines should be equal or a constant difference maintained.

- The impulse lines and the valve connection system configuration should be implemented taking into

consideration the measurement conditions, the need to access the transmitters for maintenance and

access the impulse lines for water or gas removal and flushing purposes.

7.1.3. Transmitters should be as much as possible be protected from any physical damage.

Should the installation location compromise the integrity of the process connection or the

electrical connection causing leaking of the medium or making the electrical connection

unreliable or hazardous a more appropriate location should be selected.

7.2. Low Ambient Temperature

When the solidification point of a liquid process medium is greater than the ambient temperature,

steps should be taken to protect the sensor from freezing effects such as fluid expansion.

This is particularly important in the of case open air installations.

Protection by filling the impulse lines with an ethylene glycol and water mixture, or another liquid whose

solidification point ensures the minimum working temperature is not exceeded. The transmitter case and electrical

connection protects the transmitter from short exposure to low temperatures only. Where the temperature is very

low (less than -25°C), the transmitter and impulse lines should be heated.

7.3. High Process Temperatures.

The PYRP-28 and PYRD-28 transmitters may be used to measure media with temperatures of up to 120°C.

To protect the sensing module from temperatures in excess of 120ºC, suitably long impulse lines should be

incorporated to disperse the heat and to reduce the process temperature at the transmitter inlet.

Where it is not possible to use impulse lines of necessary length, PYRP-28 transmitters with alternative protection

methods should be used i.e. cooling elements/radiators or diaphragm seals (see these options in separate

literature)

For the Intrinsically Safe version also see the Appendix at page 27 onwards.

7.4. Mechanical Vibration, Corrosive Media.

7.4.1. The transmitters will operate satisfactorily without hindrance when subjected to vibration with amplitudes up

to 1.6 mm and accelerations to 4g.

If high levels of vibration are transmitted to the equipment via the pressure line, a more flexible line with vibration

dampening properties should be adopted, or alternatively the connection to the transmitter interrupted via a

diaphragm seal and capillary.

7.4.2. On the PYRP-28 pressure transmitters, where the process medium is incompatible with the

standard 316L stainless steel diaphragm, the option of Hastelloy C276 should be considered. (The

PYRD-28 differential pressure transmitter is fitted with Hastelloy C276 diaphragm as standard).

If this material is also not compatible then other means of protection should be adopted such as

chemical/diaphragm seals. Please refer to separate literature for these items.

DTR.PYRP.PYRD.PYRL-28

8. INSTALLATION AND MECHANICAL CONNECTIONS

8.1. The PYRP-28 transmitters can be mounted directly on rigid impulse lines.

Where connectors as in figures 3a, 4a, 5a, 6a, 6c, 6e are used it is recommended that connection sockets as

figures 3b, 4b, 5b, 6b or 5c, 6d, 6f are also incorporated.

Where the connectors as figures 4a, 5a and 6c, 6e are used then flat gaskets are also to be fitted.

The socket shown as in figure 5c, 6d and 6f can be obtained from the Pyropress.

The seal material is to be selected based on the pressures involved, type of medium and the process temperature.

If the pressure is applied via flexible tubing the transmitter should be mounted on a fixed surface or support.

The material and characteristics of the impulse tubes are to be selected in the same way as the seal material

above, i.e. based on pressure, medium and temperature.

8.2. The PYRD–28 transmitters can be mounted directly on rigid impulse lines.

To connect the basic versions of transmitters, with two threaded connections (N4,GA,GB or P), one can use

standard stainless steel threaded tube connectors.

The PYRD–28 transmitters can be installed using mounting bracket (BF) for wall mounting or attachment to a

ø25 pipe (Figure 11).

The PYRD–28 with manifold style (C-type connector) are designed for installation on 3 valve or 5 valve manifolds.

When fitted with a manifold BU mounting bracket can be used for wall mounting (figure 13) or without manifolds

mounting bracket BCZ (zinc plated steel) or BCS (stainless steel) can be used for wall mounting or 2” pipe

mounting (figure 12).

8.3. The PYRP-28 and PYRD-28 transmitters can be installed and will operate satisfactorily in any orientation.

When directly mounted on equipment with a high process temperature (up to 120°C) or radiated heat it is

recommended that the transmitter is mounted (if possible) to the side of the equipment and not directly in the flow

of a continuous rising heat source.

The PYRP-28 can be fitted to a Pyropress syphon loop to protect against high temperature vapour applications,

see Fig. 14.

In the case of narrow pressure spans, the accuracy can be affected by the location of the transmitter, the

configuration of the impulse lines and the way in which they are filled with the liquid process medium.

This error can be corrected using the zero setting function.

8.4. In selecting the correct assembly components, Pyropress would be pleased to provide information and

recommendations for connection elements, adapters, sockets, valves and other ancillary items.

Further details of these items can be found in the transmitter catalogue.

Pressure may be applied to the transmitter only after checking that the item has a measurement

range and maximum withstand rating that is equal to or greater than the value of the pressurised

system. Additionally gaskets must have been have been properly selected and fitted, and the

pressure connections have been correctly secured.

Attempts to undo fasteners or fixing connector pipes on a transmitter whilst pressurised may

cause the medium to leak and create hazards for the personnel.

When removing the transmitter it must be isolated from the process pressure or the pressure

reduced to atmospheric level. It is also important that due care is taken with regard to the

characteristics of medium which may be highly reactive, caustic, explosive, high temperature or

otherwise hazardous to personnel.

If necessary, rinse out this part of the system before removing the transmitter and wear suitable

protective clothing based on the recommendations in the Material Safety Data Sheet (MSDS).

Transmitters with flanged diaphragm seals are to be fitted to identical mating flanges on the facility.

It is recommended that the user matches the screw joints material to the pressure, temperature, flange

material and seal to ensure tightness of the flange joint in the expected operating conditions.

Coarse threaded screws complying with ISO 261 are to be used for flanges used in the transmitters.

9. ELECTRICAL CONNECTION

9.1. General recommendations

It is recommended that twisted pair cabling be used for the signal lines. If the transmitter and signal line are

subject to a large amount of electromagnetic interference, then screened twisted pair cable should be used.

The signal wires should not run alongside network power supply cables or near to equipment that draws high

levels of electrical current.

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