Yokogawa RAKD User Manual

0 (0)

User´s

Model RAKD

Manual

Small Metal ROTAMETER

IM 01R01B30-00E-E

Rota Yokogawa GmbH & Co. KG

Rheinstr. 8

D-79664 Wehr

Germany

IM 01R01B30-00E-E ©Copyright 2003 (Rü)

5th edition, January 2013 (Rü)

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<CONTENTS>

i

 

 

 

Contents

 

1.

Introduction.........................................................................................

1-1

 

1.1

ATEX Documentation.......................................................................................

1-3

 

1.2

General description.........................................................................................

1-4

 

1.3

Principle of measurement...............................................................................

1-4

 

1.4

Overview...........................................................................................................

1-5

2.

Precautions.........................................................................................

2-1

 

2.1

Transportation and Storage............................................................................

2-1

 

2.2

Installation........................................................................................................

2-1

3.

Installation...........................................................................................

3-1

 

3.1

Installation in the pipeline..............................................................................

3-1

 

3.2

Wiring ...............................................................................................................

3-1

 

3.2.1

Connecting diagrams...........................................................................................

3-1

 

3.2.2

Conductor connection with Quickon ................................................................

3-4

 

3.2.3

Conductor M12 connection (Option /A29 or /A30) .........................................

3-6

4.

Start of operation................................................................................

4-1

 

4.1

Hints on flow rate measurement....................................................................

4-1

 

4.2

Pulsation and pressure shock.......................................................................

4-1

 

4.3

Start of operation of electronic transmitter..................................................

4-1

5.

Limit switches (Option /K1 to /K10) .............................................................................

5-1

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IM 01R01B30-00E-E 5th edition January 01, 2013 -00

ii

 

 

<CONTENTS>

 

6.

Service...........................................................................................................

6-1

 

6.1

Maintenance.....................................................................................................

6-1

 

6.1.1

Function test.........................................................................................................

6-1

 

6.1.2

Measuring tube, float............................................................................................

6-1

 

6.1.3

Explosion drawings..............................................................................................

6-2

 

6.1.4

Electronic transmitter...........................................................................................

6-3

 

6.1.5

Exchange of scale................................................................................................

6-3

 

6.1.6

Exchange of indicator..........................................................................................

6-3

 

6.1.7

Troubleshooting....................................................................................................

6-4

 

6.2

Template for sending back to service...........................................................

6-5

7. Technical Data......................................................................................

7-1

 

7.1

RAKD Type-, Suffix-codes and Options.........................................................

7-1

 

7.2

Standard Specifications..................................................................................

7-6

 

7.3

Dimensions and weights...............................................................................

7-11

 

7.4

Temperature curves ......................................................................................

7-15

8.

Explosion-protected Type Instruments.............................................

8-1

 

8.1

General.............................................................................................................

8-1

 

8.2

Intrinsically safe ATEX certified RAKD (/KS1)..............................................

8-2

 

8.2.1

Technical data.......................................................................................................

8-2

 

8.2.2

Installation............................................................................................................

8-4

 

8.3

Intrinsically safe IECEx certified RAKD (/ES1).............................................

8-5

 

8.3.1

Technical data.......................................................................................................

8-5

 

8.3.2

Installation............................................................................................................

8-7

 

8.4

Non incendive RAKD for Category 3 (ATEX) (/KN1)....................................

8-8

 

8.5

Dust proofed limit switches (ATEX) (/KS2)...................................................

8-8

 

8.6

Intrinsically safe "ic" RAKD for Category 3G (ATEX /IECEx) (/KS3, /ES3)8-9

8.7 Intrinsically safe FM / CSA (USA + Canada) components (/FS1, /CS1).............

8-10

8.7.1 Limit switches option /K1 ...

/K10 (/FS1 for USA).............................................

8-10

8.7.2 Limit switches option /K1 ...

/K10 (/CS1 for Canada).......................................

8-10

8.8 Intrinsically safe NEPSI (China) certified RAKD (/NS1)......................................

8-16

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<CONTENTS>

iii

APPENDIX 1. Safety Instrumented Systems Installation..................

A1-1

A1.1

Scope and Purpose....................................................................................

A1-1

A1.2

Using RAKD for a SIS Application...........................................................

A1-1

A1.2.1 Safety Function..................................................................................................

A1-1

A1.2.2 Diagnostic Response Time...............................................................................

A1-2

A1.2.3 Setup...................................................................................................................

A1-2

A1.2.4 Proof Testing......................................................................................................

A1-2

A1.2.5 Repair and replacement...................................................................................

A1-2

A1.2.6 Startup Time.......................................................................................................

A1-3

A1.2.7 Reliability data...................................................................................................

A1-3

A1.2.8 Lifetime limits....................................................................................................

A1-3

A1.2.9 Environmental limits.........................................................................................

A1-3

A1.2.10 Application limits.............................................................................................

A1-3

A1.3 Definitions and Abbreviations....................................................................

A1-4

A1.3.1 Definitions..........................................................................................................

A1-4

A1.3.2 Abbreviations.....................................................................................................

A1-4

A1.4 Assessment results.....................................................................................

A1-5

A1.4.1 Safety related parameters................................................................................

A1-5

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iv

<CONTENTS>

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<1. INTRODUCTION>

1-1

1. Introduction

Before use, read this manual thoroughly and familiarize yourself fully with the features, operations and handling of Rotameter RAKD to have the instrument deliver its full capabilities and to ensure its efficient and correct use.

Notices Regarding This Manual

This manual should be passed to the end user.

The contents of this manual are subject to change without prior notice.

All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without the written permission of Rota Yokogawa (hereinafter simply referred to as Yokogawa).

This manual neither does warrant the marketability of this instrument nor it does warrant that the instrument will suit a particular purpose of the user.

Every effort has been made to ensure accuracy in the contents of this manual. However, should any questions arise or errors come to your attention, please contact your nearest Yokogawa sales office that appears on the back of this manual or the sales representative from which you purchased the product.

This manual is not intended for models with custom specifications.

Revisions may not always be made in this manual in conjunction with changes in specifications, constructions and/or components if such changes are not deemed to interfere with the instrument’s functionality or perfor-mance.

Notices Regarding Safety and Modification

For the protection and safety of personnel, the instrument and the system comprising the instrument, be sure to follow the instructions on safety described in this manual when handling the product. If you handle the instrument in a manner contrary to these instructions, Yokogawa does not guarantee safety.

If this instrument is used in a manner not specified in this manual, the protection provided by this instrument may be impaired.

As for explosion proof model, if you yourself repair or modify the instrument and then fail to return it to its original form, the explosion protected construction of the instrument will be

impaired, creating a hazardous condition. Be sure to consult Yokogawa for repairs and modifications.

The following safety symbols and cautionary notes are used on the product and in this manual:

WARNING

This symbol is used to indicate that a hazardous condition will result which, if not avoided, may lead to loss of life or serious injury. This manual describes how the operator should exercise care to avoid such a risk..

CAUTION

This symbol is used to indicate that a hazardous condition will result which, if not avoided, may lead to minor injury or material damage. This manual describes how the operator should exercise care to avoid a risk of bodily injury or damage to the instrument.

IMPORTANT

This symbol is used to call your attention to a condition that must be observed in order to avoid the risk of damage to the instrument or system problems.

NOTE

This symbol is used to call your attention to information that should be referred to in order to know the operations and functions of the instrument.

For Safe Use of Rotameter RAMC

WARNING

If the process fluid is harmful to personnel, handle Rotameter RAKD carefully even after it has been removed from the process line for maintenance or other purposes. Exercise extreme care to prevent the fluid from coming into contact with human flesh and to avoid inhaling any residual gas.

In case of Explosion proof type instrument, further requirements and differences are

described in Chapter 8 " INSTRUCTIONS FOR EXPLOSION PROTECTED RAKD”. The description in Chapter 8 is prior to other descriptions in this instruction manual.

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1-2

<1. INTRODUCTION>

CAUTION

When carrying Rotameter RAKD around, exercise extreme care to avoid dropping it accidentally and causing bodily injury.

Warranty

The warranty of this instrument shall cover the period noted on the quotation presented to the

Purchaser at the time of purchase. The Seller shall repair the instrument free of charge when the failure occurred during the warranty period.

All inquiries on instrument failure should be directed to the Seller’s sales representative from whom you purchased the instrument or your nearest sales office of the Seller.

Should the instrument fail, contact the Seller specifying the model and instrument number of the product in question. Be specific in describing details on the failure and the process in which the failure occurred. It will be helpful if schematic diagrams and/or records of data are attached to the failed instrument.

Whether or not the failed instrument should be repaired free of charge shall be left solely to the discretion of the Seller as a result of an inspection by the Seller.

The Purchaser shall not be entitled to receive repair services from the Seller free of charge, even during the warranty period, if the malfunction or damage is due to:

improper and/or inadequate maintenance of the instrument in question by the Purchaser.

handling, use or storage of the instrument in question beyond the design and/or specifications requirements.

use of the instrument in question in a location not conforming to the conditions specified in the

Seller’s General Specification or Instruction

Manual.

retrofitting and/or repair by an other party than the Seller or a party to whom the Seller has entrusted repair services.

improper relocation of the instrument in question after delivery.

reason of force measure such as fires, earthquakes, storms/ floods, thunder/lightning, or other reasons not attributable to the instrument in question.

WARNING

When removing the instrument from hazardous processes, avoid contact with the fluid and the interior of the meter.

In case of Explosion proof type instrument, further requirements and differences are

described in Chapter 8 " INSTRUCTIONS FOR EXPLOSION PROTECTED RAKD”.The description in Chapter 8 is prior to other descriptions in this instruction manual..

Restriction on Use of Radio Transceiver

IMPORTANT

Although the transmitter has been designed to resist high frequency electrical noise, if a radio transceiver is used near the transmitter or it external wiring, the transmitter may be affected by high frequency noise pickup. To test for such effects, bring the transceiver in use slowly from a distance of several meters from the transmitter, and observe the measurement loop for noise effects. Thereafter, always use the transceiver outside the area affected by noise.

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Yokogawa RAKD User Manual

<1. INTRODUCTION>

1-3

1.1 ATEX Documentation

This is only applicable to the countries in European Union.

GB

SK

CZ

DK

I

LT

E

LV

EST

NL

PL

SF

SLO

P

H

F

BG

D

RO

S

M

GR

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1-4 <1. INTRODUCTION>

1.2 General description

This manual describes installation, operation and maintenance of the RAKD. Please read it carefully before using this device.

Further, please note that customer features are not described in this manual. When modifying specifications, construction or parts, this manual is not necessarily revised unless it can be assumed that these changes will impair RAKD functions or performance.

All units are thoroughly tested before shipping. Please check the received units visually to ensure that they have not been damaged during transport. In case of defects or questions please contact your nearest

YOKOGAWA service centre or sales office. Please describe any defect precisely and indicate model code as well as com. no. number.

YOKOGAWA refuses any liability for units which have been repaired by the user without prior consent and do not meet the specifications as a consequence..

1.3 Principle of measurement

The RAKD is a Variable Area Flow Meter for volume and mass measurements of gases and liquids.

A float, whose movement is nearly independent of viscosity is guided concentrically in a specially shaped cone. The position of the float is transferred magnetically to the indicator, which shows the measurement values by a pointer on a scale. The indicator can be equipped with limit switches and an electronic transmitter.

F10.EPS

Fig. 1.1

All units are calibrated with water or air by the manufacturer. By adjusting the calibration values to the measured substance’s state of aggregation (density, viscosity), the flow rate scale for each measuring tube can be determined.

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<1. INTRODUCTION>

1-5

1.4 Overview

 

Tube

Limit switch MAX

Indicator

below scale

Cable connection

Quickon

 

Pointer

Limit switch MIN

Scale

below scale

F11.EPS

Example for scale :

Flow scale

Flow unit

Ex-marking

Ex-data electronic transmitter

Limit switch Ex-data limit switch

 

 

 

 

Com. no..

 

 

Manufactured:2009

 

Model code

 

 

Kom.Nr.:200000/001

 

 

 

 

 

 

100

MS-Code:RAKD41-G6SS-33NNN-

 

 

E80424/K1/KS1

 

 

 

 

Wasser

 

 

 

 

0,99831 g/cm

 

 

 

 

1 mPas

Made in Germany D-79660 Wehr

 

 

20 Grad C

 

 

 

 

 

 

1.1 bar abs.

 

Medium data

50

l/h

 

 

 

 

 

 

 

KEMA 00ATEX 1037X

 

 

 

 

Ex ia IIC T6

 

 

 

10

Transmitter

 

 

 

Ui= 30V Ii= 100mA

II2G

 

 

Pi= 0.75W

Ex-marking

 

 

 

 

Li= 0.73mH Ci= 2.4nF

 

 

 

Limit Switch: SC2-N0

 

 

 

 

KEMA 00ATEX 1037X

 

 

 

 

Ex ia IIC T6

 

 

 

 

see certificate for data

 

 

F12.EPS

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1-6

<1. INTRODUCTION>

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<2. PRECAUTIONS>

2-1

2. Precautions

2.1 Transportation and Storage

Before transporting the unit, it is recommended to fix the float with a card-board strip in the same way as when shipped from factory. Prevent foreign objects from entering the tube (e.g. by covering openings). To protect the unit and especially the tube’s interior from soiling, store it only at clean and dry locations

2.2 Installation

Ambient temperature and humidity of the installation location must not exceed the specified ranges. Avoid locations in corrosive environments. If such environments are unavoidable, ensure sufficient ventilation.

Although the RAKD features a very solid construction, the instrument should not be exposed to strong vibration or impact stress.

Please note that the RAKD is magnetic sensing system can be influenced by external inhomogeneous magnetic fields (such as solenoid valves). Alternating magnetic fields (≥ 10Hz) as well as homogeneous, static magnetic fields (in the area of the RAKD), like the geomagnetic field have no influence. Asymmetric ferromagnetic bodies of considerable mass (e.g. steel girders) should be kept at a distance of at least 250 mm from the RAKD.

To avoid interference, the distance between two adjacent RAKDs must be at least 120 mm.

Do not expose the unit to pressures higher than the indicated maximum operating pressure (refer to specifications)

Make sure that wetted parts are resistant against the process medium.

Ambientand process-temperature may exceed specified maximum values. Note the temperature curves in fig. 2-1 and chapter 7 "Technical data".

The Rotameter must be mounted vertically. The flow direction is upwards.

Max. operation temperature [°C]

Illustration of maximum allowable operation temperature depending on ambient temperature for Rotameter type RAKD

275

250

225

200

175

150

125

100

75

50

55

60

65

 

 

70

75

80

 

 

 

Ambient temperatur [°C]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Version without valve

 

 

Version with valve

 

 

F21.EPS

 

 

 

 

 

Fig. 2-1. For option /KS1or /KN1 (Ex-version) the maximum values for ambient and process temperature according to the respective temperature class mentioned in fig. 3-2 and tables 7-2 to 7-5 must be regarded. The minimum ambient temperature is -25°C.

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2-2 <2. PRECAUTIONS>

Check movability of the float (5)* by watching the pointer. The pointer should follow the movement of the float. If this is not the case, float and measuring tube (1;21) should be cleaned.

Check the movability of the pointer by careful moving it with your fingers and watching whether it responds to the scale value. If it does not work properly, the mechanical display unit (14) must be changed.

To avoid damage of the float and of the stopper do not use magnetic valves. In the phase of start up increase the flow slowly to the desired flow rate. If a sudden rise of the pressure can not be avoided (with use of

magnetic valves) the flow must be limited to the maximum used value (e.g. by valve).

*: Position numbers are illustrated in the explosion drawings in chapter 6.

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<3. INSTALLATION>

3-1

3. Installation

3.1 Installation in the pipeline

The pipe has to be so stabilized that vibrations on the pipe are avoided. Additional recommendations can be

found in guideline VDI/VDE 3513 sheet 3.

If pollution of the metering tube may appear a bypass-pipe is recommended, which permits the removal (see. chapter 6 “maintenance”) of the Rotameter for cleaning without interruption of the flow.

Before installing the Rotameter, make sure there are no parts of packing or securing inside the Rotameter.

It has to be taken care at the connection of units with internal thread that no residues of the sealing compound come into the tube (e.g. remains of the PTFE sealing compound).

To avoid stress in the connecting pipes, the connecting flanges must be aligned in parallel and axial direction. Bolts and gaskets have to be selected according to the maximum operating pressure, the temperature range and corrosion conditions. Centre gaskets and tighten nuts with a torque appropriate for the pressure range.

If contamination or soiling of the RAKD is to be expected, a bypass should be installed to allow the removal of the instrument without interruption of the flow.

Please read also chapter 2.2. For further instructions on installation please refer to VDI/VDE3513.

In case of devices without valve but with process connection internal thread the float shaft of tubes with cone 44 and bigger sizes may move into the range of the threaded joint. Keep attention not to bend the guide bar when screwing up the connection. The inner diameter of the connector must be at least 8 mm for cone sizes

44 - 51 resp. 10 mm for cone sizes 52 and 53.

To avoid float bouncing in case of gas applications, attend to VDI/VDE 3515 sheet 3.

For devices without valve use a throttle either in the inlet or outlet (to install at that side with the bigger volume). For installation of several instruments in parallel tubes take care that the distance between the middle axis is at least 120 mm to avoid magnetic influence. The distance to other ferritic material should not be less than

60 mm. Take care that the strength of external magnetic fields is approximately 0 mT.

3.2 Wiring

3.2.1 Connecting diagrams

Please regard the drawings of this chapter.

RAKD with electronic transmitter or with limit switches have one or two Quickon connectors at the rear.

In the connecting diagrams he lower one is named "S" and the upper one "T". Not used connector positions are closed with a blind plug.

The following table shows the connections for the respective equipment configuration.

 

Type T

Type T

Type T

Type T

Type E

Type E

Type E

Type E

 

without contact

with MIN contact

with MAX contact

with MIN/MAX

without contact

with MIN contact

with MAX contact

with

 

 

/K1 or /K6

/K2 or /K7

contact /

without pulse

/K1 or /K6

/K2 or /K7

pulse output

 

 

 

 

K3 or /K8

 

 

 

/CP

Quickon

---

---

MAX contact

MAX contact

Current output

Current output

Current output

Current output

upper "T"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Quickon

---

MIN contact

---

MIN contact

---

MIN contact

MAX contact

Puls output

lower "S"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T31.EPS

The load resistance of metering or indicating instruments, which are connected serial to the current output, may not exceed (U- 13.5 V) / 20 mA .

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3-2

<3. INSTALLATION>

 

 

 

 

RAKD-E80

 

 

 

 

 

 

G

+

2

 

 

 

 

 

 

 

+

 

 

T

 

 

RL

Power supply U

 

 

-

 

 

 

-

 

F

1

4-20mA

Power supply U / V

RL / Ω

 

 

 

 

 

 

 

 

 

 

 

 

13.5V ...30V

< (U-13.5V) / 20mA

 

T = QUICKON connector

 

 

 

 

 

Fig. 3-1

RAKD with electronic Transmitter

 

 

 

Hazardous Area

Safe Area

 

 

 

Supply 230V AC

 

 

 

 

14

15

 

 

 

 

~

~

 

RAKD - T80

 

 

 

U

 

 

 

 

 

 

 

BN+

1

1 +

9

 

 

 

 

MAX

BU-

T

3 -

8

Limit MAX

 

2

7

 

 

 

 

 

 

BN+

1

4 +

12

 

 

11 Limit MIN

MIN

BU-

S

6 -

 

 

F

 

2

 

10

 

Limit Switches

EN 60947-5-6 (NAMUR)

Limit Switch Type 2

Ex ia IIC T6...T4 Gb

Ui = 16V

Ii = 25mA

Pi = 64mW

Ci = 150nF

Li = 0.15mH

KEMA 00ATEX 1037X

Transmitter Relay

KFA6-SR2-Ex2.W

KFA6-SR2-Ex2.W

Ex ia IIC

Uo= 10.6V

Io = 19,1mA

Po = 51mW

Co = 2320nF

Lo= 97mH

PTB 00ATEX 2081

F3.EPS

Fig. 3-2

RAKD with 2 limit switches in combination with transmitter relay in Exversion

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<3. INSTALLATION>

3-3

Hazardous Area

 

4-20mA output

 

Ex ia IIC T6...T4 Gb

 

Ui = 30V

 

Ii = 100mA

 

Pi = 0.75W

 

Ci = 2.4nF

 

Li = 0.73mH

 

KEMA 00ATEX 1037X

 

RAKD-E80 Option /KS1

 

G

2

L+

 

 

T

L-

1

F

 

BN+

1

BU

S

-

2

 

1 K

1

15 K P+

S

P-

 

2

Limit switch or

 

Pulse output

 

EN 60947-5-6 (NAMUR)

Puls output

Limit switch type 2

Ex ia IIC T6...T4 Gb

Ex ia IIC T6...T4 Gb

Ui = 16V

Ui = 16V

I i = 20mA

I i = 25mA

Pi = 64mW

Pi = 64mW

C i = 0nF

C i = 150nF

L i= 0mH

L i = 0.15mH

KEMA 00ATEX 1037X

KEMA 00ATEX 1037X

Safe Area

RN221N-B1

[Ex ia] IIC Uo = 27.3V Io = 87.6mA Po= 0.597W Co= 86nF Lo= 5.2mH

Tamax = 50°C

PTB 00ATEX 2018

Transmitter power supply

Option: /UT

I +

O+

 

Output 4-20mA

O -

I -

N/- L/+

Power supply

14

15

230V AC

 

~

~

 

 

U

9

1 +

 

 

8 Limit switch / Puls

3 -

 

 

7

 

 

Transmitter relay

Option: /W2A

KFA6-SR2-Ex1.W

[Ex ia] IIC

Uo = 10.6V I o = 19.1mA Po= 51mW

Co= 2320nF

Lo= 97mH

PTB 00ATEX 2081

Fig. 3-3

RAKD in Ex-version with electronic transmitter in combination with power supply

 

and additional limit switch or pulse output with transmitter relay.

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3-4

<3. INSTALLATION>

3.2.2 Conductor connection with Quickon

To connect the conductor, please observe in particular the following steps :

-Strip the sheath to a length of approx. 15 mm

(fig. 3-4) and slide the union nut (1), the cap (2) and the rubber seal (3) onto the conductor.

5

3

2

4

1

15mm

Fig. 3-4

F6.EPS

F7.EPS

Fig. 3-5

-Slide the rubber seal as far as the rim of the insulation and then slide the cap onto the rubber seal. This provides the strain relief for the conductor (fig. 3-5).

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<3. INSTALLATION>

3-5

-insert the core ends into the feed through of the splice ring (fig. 3-6). In order to guarantee a clear assignment of the cores, the individual core feed thorough of the splice ring are numbered (1, 2,…).

Fig. 3-6

- Cut off the projecting core ends. Make sure that

 

the core ends are flush with the splice ring (5):

 

they can protrude by up to 3 mm, but must not

 

be too short.

F8.EPS

-Insert the prepared conductor into the QUICKON contact carrier (4). Turn the conductor with the splice ring until the coding noses fit exactly into the corresponding guides (fig. - ).

Fig. 3-7

-Close the gland by tightening the union nut. This presses the core ends into the insultation displacement terminal blocks, cuts open the core insulation and creates the electrical contact (IDC connection system).

F9.EPS

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3-6

<3. INSTALLATION>

3.2.3 Conductor M12 connection (Option /A29 or /A30)

Fig. 3-8

Angular mating connector is only factory delivered with option /A30.

Pin assignment:

 

 

 

 

 

 

 

 

 

 

Connection

Signal

 

 

 

 

Upper connector 1 (+) 2 (-)

One limit switch /K1, /K2, /K6, /K7

 

 

 

Two limit switches /K3, /K8, /K9, /K10: lower switch, e.g. MIN MAX ==> MIN

 

 

 

 

Upper connector 3 (+) 4 (-)

Two limit switches /K3, /K8, /K9, /K10: upper switch, e.g. MIN MAX ==> MAX

 

 

 

 

Lower connector 1 (+) 2 (-)

Electronic transmitter, 4-20 mA supply

 

 

 

 

Lower connector 3 (+) 4 (-)

Electronic transmitter, pulse output (option /CP)

 

 

 

 

IM 01R01B30-00E-E 5th edition January 01, 2013 -00

All Rights Reserved. Copyright © 2003, Rota Yokogawa

<4. START OF OPERATION>

4-1

4. Start of operation

4.1 Hints on flow rate measurement

The measured fluid should neither consist of a multi-phase mixture nor contain ferrite ingredients or large solid mass particles.

The RAKD scale is adjusted to the state of operation/aggregation of the measured fluid by the manufacturer. If the state of operation changes, it might become necessary to establish a new scale.

This depends on several factors:

-If the RAKD is operated in the given viscosity independent range, only the density of the float as well as the operational density of the previous and new substance have to be considered. In case the operational density only changes marginally (≤ 0.5%), the present scale can be used.

-If the RAMC is operated outside the given viscosity independent range, the viscosities at the previous and new state of operation as well as the mass and diameter of the float have to be taken into account.

To establish a new scale, please refer to the folder “Anweisung zur Skalenumrechnung” (Instructions for Scale Conversion) as well as the conversion table or order a new scale.

4.2 Pulsation and pressure shock

Strong pressure impact or flow pulsations can impair measuring operation considerably and should be avoided open valves slowly, raise operating pressure slowly).

4.3 Start of operation of electronic transmitter

Ensure that the device has been connected correctly according to section 3-2 and that the used power supply meets the requirements indicated on the scale.

Switch on the power supply..

The RAMC is now ready for operation..

The transmitter is prepared and calibrated according to its model code as a 2 wire unit.

All Rights Reserved. Copyright © 2003, Rota Yokogawa

IM 01R01B30-00E-E 5th edition January 01, 2013 -00

4-2

<4. START OF INSTALLATION>

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IM 01R01B30-00E-E 5th edition January 01, 2013 -00

All Rights Reserved. Copyright © 2003, Rota Yokogawa

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