instruction manual - honeywell · instruction manual smartradar verification pin compensation page...

Instruction manualSmartRadar Verifi cation pin compensation

Instruction manual SmartRadar Verification pin compensation Page 1

Instruction manual SmartRadar Verification pin compensation

June 2009

Part no. 4416.635

Revision 2

Enraf B.V. P.O. Box 812 2600 AV Delft Netherlands Tel. : +31 15 2701100 Fax : +31 15 2701111 E-mail : [email protected] Website : http://www.honeywellenraf.com


Copyright 2000 - 2009 Enraf B.V. All rights reserved.

Reproduction in any form without the prior consent of Enraf B.V. is not allowed. This manual is for information

only. The contents, descriptions and specifications are subject to change without notice. Enraf B.V. accepts no

responsibility for any errors that may appear in this manual.

The warranty terms and conditions applicable in the country of purchase in respect to Enraf B.V. products are

available from your supplier. Please retain them with your proof of purchase.

Preface


Preface

This manual is intended for technicians involved with the commissioning and service of the Enraf Series 873

and 973 SmartRadar with H04 antenna, installed on a 4" stilling well with verification pins.

A description preceding the technical procedures gives the technical information necessary to understand its

functioning. It is recommended to read this description prior to performing any of the procedures.

Safety and prevention of damage

Refer to the chapter Safety in the instruction manual of the 873 SmartRadar or 973 SmartRadar LT for detailed

safety instructions.

"Warnings", "Cautions", and "Notes" have been used throughout this manual to bring special matters to the

immediate attention of the reader.

• A Warning concerns danger to the safety of the technician or user;

• A Caution draws attention to an action which may damage the equipment;

• A Note points out a statement deserving more emphasis than the general text, but does not deserve a

"Warning" or a "Caution".

The sequence of steps in a procedure may also be important from the point of view of personal safety and

prevention of damage; it is therefore advised not to change the sequence of procedural steps or alter a

procedure.

Legal aspects

The commissioning and troubleshooting to the instrument may only be conducted by qualified engineers, trained

by Enraf and with knowledge of safety regulations for working in hazardous areas.

The information in this manual is the copyright property of Enraf B.V., Netherlands.

Enraf B.V. disclaims any responsibility for personal injury or damage to equipment caused by:

• Deviation from any of the prescribed procedures;

• Execution of activities that are not prescribed;

• Neglect of the general safety precautions for handling tools and use of electricity.

EC declaration of conformity

Both the 873 and 973 SmartRadar’s are in conformity with the protection requirements of EC Council Directive

93/68/EEC. The CE conformity marking fulfills the provision of:

• 89/336/EEC regarding EMC:

o EN 50081-2 Generic Emission Standard

o EN 50082-2 Generic Immunity Standard

• 73/23/EEC regarding Low Voltage Directive

The 973 SmartRadar LT also fulfills the provision of:

• 94/09/EEC regarding ATEX

• 97/23/EEC regarding PED Directive

Additional information

Please do not hesitate to contact Enraf or its representative if you require any additional information.

Table of contents


Table of contents

Preface.................................................................................................................................................................. 3

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

2 Determining ullage position of verification pins .............................................................................................. 7

3 Verification pin measuring mode.................................................................................................................... 8

3.1 Preparations for verification pin measuring mode................................................................................ 8

3.2 Rotating the Antenna in verification pin measuring position................................................................. 9

3.3 Verification pin position measurement ............................................................................................... 10

3.4 Rotate Antenna Unit / 973 SmartRadar LT housing in product measuring position ........................... 11

4 Verifying the verification pin correction......................................................................................................... 12

Appendix Related documents ............................................................................................................................ 13

Index ................................................................................................................................................................... 14

Introduction


1 Introduction

When a radar level gauge is installed on a pressurized tank, both ISO1) and API

2) suggest to use so called

verification pins to verify the radar level measurement. Prime reason to use said verification pins is the

impossibility of doing a manual reference dip. With verification pins it is possible to verify the correct reading of

the radar measurement at specific heights while the tank is in operation.

The Enraf SmartRadar gauges support the use of verification pins via embedded software. The SmartRadar can

be switched to measure the pin positions. The reading can then be compared with the known position of the

pins.

It is advised to have three verification pins:

• Pin 1 at approximately 80 - 90 % of tank height

• Pin 2 at approximately 50 % of tank height

• Pin 3 at approximately 10 - 20 % of tank height

Pin 1 should be above maximum safe fill (so, it can always be measured), however there must be at least

0.6 m (2') free space from pin 1 to cone end. All pin positions should be measured with 1 mm (1/

32“) uncertainty

with reference to the ball valve.

Compensation principle

The SmartRadar can measure the position of the three pins when the Antenna Unit (for 873 SmartRadar) or the

973 SmartRadar LT housing is rotated 90°. The verification pins are then ‘visible’ to the SmartRadar.

1) Refer to ISO document 4266 part 3

2) Refer to API document Chapter 3.3

Introduction


This can be done without closing the 1" (or 4") ball valve, as the Antenna Unit (for 873 SmartRadar) or the 973

SmartRadar LT housing is located above the tank separator.

After the command “verification pin measuring mode” is given to the SmartRadar, the measured positions of the

three pins can be requested. The “real” position of the pins (from tank drawing) and the “measured” position of

the pins are programmed in the SmartRadar.

After the SmartRadar is placed in the normal (product measuring) mode, the measurement is automatically

corrected for the found verification pin positions.

Figure 1.2 illustrates the correction method

for verification pins.

Once the position of the verification pins is

determined, the SmartRadar can be

switched into verification mode to verify the

measured (and corrected) distances with the

real pin positions.

If the correction is properly made, both

values of each of the three pins should be

equal to each other.

Determining ullage position of verification pins


2 Determining ullage position of verification pins

At installation of the verification pins, the

distances of the pins towards the flange of

the stilling well (L1, L2 and L3) are noted.

The SmartRadar measures ullage from the

radar zero point.

Note: The radar zero point from the

SmartRadar with an H04 Antenna

is located at the flange of the tank

separator.

Step 1)

The distance from the flange of the stilling

well to the flange of the tank separator

(offset) must be determined accurately.

To have an indication that this distance

is measured accurate enough, repeat

this measurement three times.

The difference between each of the measurements may not differ more than 1 mm (1/

32"). If there is a too

large discrepancy, repeat the measurement until a set of three consecutive measurements is obtained with the

appropriate accuracy.

Step 2)

Calculate the ullage position of the three verification pins by adding the measured distance of step 1.

Ullpin1

= L1 + offset

Ullpin2

= L2 + offset

Ullpin3

= L3 + offset

These three ullage values are the real

ullages of the verification pins and have

to be programmed in item PC (refer to

section 3.1).

Verification pin measuring mode


3 Verification pin measuring mode

The verification can be done prior to filling the tank with product in order to check correct alignment of the pins.

After the tank is filled, the verification should be repeated.

Due to vapour influence, causing a change of the propagation speed of the radar signal, small deviations may

be observed.

3.1 Preparations for verification pin measuring mode

Assumed is an already installed and pre-commissioned SmartRadar.

If possible, it is recommended to make a reflection diagram (use the Ensite service tool). Check on the reflection

diagram for peaks of the 3 pins. Its amplitude should be below the thresholds.

If the 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing is turned in verification pin position mode, the

signals of the 3 pins will be approximately 25 to 30 dB higher. Make sure that then the peaks are above the

thresholds, else they are not detected. If required, lower the threshold in one or more of the zones.

Item Name Description

W2= Protection level 2 Enter protection level 2.

PC.0.1= Ullage verification pin 1 Format according to item LD. Physical ullage of verification pin 1

with respect to radar zero (refer to section 2).





PR= Position radar Format according to item LD. The position radar item can now be

given better as the offset is known. PR is the distances:

tank zero - flange stilling well added with the measured offset.

CS= Compensation switch This item has ten positions. When the fourth position is set on:

· R enables verification pin correction

· - disables the verification pin correction

Check whether the verification pin correction is disabled. If not,

set the fourth position of item CS at ‘ - ’.

EX Exit Exit protection level 2. After the exit command, the above items

become active.

An exit command had to be given to activate the entered settings.

Execute the verification pin measurement procedure:


W2= Protection level 2 Enter protection level 2.

PP Pin measuring mode This command sets the SmartRadar in the verification pin

measuring mode. The level is stored as last valid level with a

“block” status.



3.2 Rotating the Antenna in verification pin measuring position

In normal (product measuring) position, the E-field (electrical field of the microwave) is located perpendicular to

the direction of the verification pins. In this position, the verification pins are less visible to the SmartRadar.

In verification pin measuring position, the E-field should be in parallel with the verification pin direction (refer to

figure 3.1). Then the reflections from the verification pins are stronger and recognized by the SmartRadar.

1) Release the coupling nut of the 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing.

2) Lift the 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing from tank separator.

3) Rotate the 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing for 90°. This can only be done in

one direction because of the locking pin.

4) Place 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing on tank separator; mind locking pin.

5) Secure the coupling nut of the 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing.



3.3 Verification pin position measurement

After the 873 SmartRadar Antenna Unit / 973 SmartRadar LT is rotated in the verification pin measuring

position, the peaks of the three (or less if the product level covers one or more pins) verification pins are now

above the thresholds. The ullage values (distance from the radar zero point) of all peaks above the threshold

are stored in item 5D.

Item 5D is an indexed item with ten elements. Request at least four elements, as the peak from the product is

also one of the measured peaks. Check which of the ullage values are close to the already given pin positions

of item PC.

The measured pin positions from item 5D are to be copied in item PB:


FC Freeze RSP data This command stores (freezes) a complete set of radar signal

processing data. This ensures a contiguous set of data for the

next item (5D).

Wait 5 seconds, before issuing the next items.

5D.0.4 Position of detected peaks This item is to request the measured ullages from the three

verification pins.

PB.0.1= Measured pin position 1 Format according to item LD. Copy the contents of one of the

elements from item 5D, whose ullage corresponds with pin

position 1, into this item (i.e. from 5D.0.1).


elements from item 5D , whose ullage corresponds with pin



elements from item 5D , whose ullage corresponds with pin


CS= Compensation switch This item has ten positions. When the fourth position is set on:

· R enables verification pin correction

· - disables the verification pin correction

Enable the verification pin correction by setting the fourth position

of item CS on ‘ R ‘.

EX Exit Exit protection level 2. With this command, also the pin

measuring mode is left.

If the product level of the tank is above pin position 1 and/or below pin position 3, then the correction is

extended by the following estimation:

· above pin 1: there is an interpolation from the radar zero point (no correction) to the position of pin 1 (with

its correction)

· below pin 3: the correction found at pin 3 is is valid for the range below pin position 3.



PB.0.1

+002.0028

PB.1.1

+010.0036

PB.2.1

+018.0055

PC.0.1

+002.0000

PC.1.1

+010.0000

PC.2.1

+018.0000

An example of given and measured verification pin positions is listed in the table above. From this data figure

3.2 can be made. Figure 3.2 includes the extrapolated corrections for the levels above pin 1 and below pin 3.

Figure 3.3 gives an example of a reflection diagram in verification pin measurement mode.

3.4 Rotate Antenna Unit / 973 SmartRadar LT housing in product measuring position

After the procedures have been followed in section 3.3, the 873 SmartRadar Antenna Unit / 973 SmartRadar LT

housing has to be orientated for (normal) product measurement.

Follow the same procedure as described in section 3.2, but now the 873 SmartRadar Antenna Unit / 973

SmartRadar LT housing is orientated in the original position.

Verifying the verification pin correction


4 Verifying the verification pin correction

Once the procedures for the correction by means of verification pins as described in the previous sections are

performed, the correction can be verified.

1) Enter protection level 1;

2) Give command PP (verification pin measuring mode) to the SmartRadar;

3) The 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing is “rotated” into verification pin

measurement mode (refer to section 3.2);

4) Give command FC and wait for 5 seconds;

5) Read the measured and corrected pin positions in item 4Z (indexed item, read first three elements);

6) Compare these values with the physical pin positions, given in item PC (indexed item; read first three

elements);

7) “Rotate” 873 SmartRadar Antenna Unit / 973 SmartRadar LT housing into product measuring mode;

8) Give EX (exit) command to the SmartRadar.

The differences between the measured pin positions and the real pin positions should not exceed more than ±3

mm. This is only valid if vapour compensation is used. Else, the tolerated differences should be taken larger (i.e.

±10 mm).

Appendix


Appendix Related documents

Title Part no.

Instruction manual 873 SmartRadar 4416.571

Instruction manual 973 SmartRadar LT 4416.632

Model 973 SmartRadar LT Safety instructions for installation, commissioning,

operation and maintenance 4416.643

Instruction manual ENSITE service tool 4416.587

Item documentation Enraf series 854, 873, 877 and 973 gauges 4416.277

Installation guide SmartRadar Verification pins 4416.591

Installation guide 873 SmartRadar Control Unit & Antenna Unit 4416.569

4416.731

Installation guide 973 SmartRadar LT 4416.641

Installation guide SmartRadar Antennas 4416.642

Index


Index

Block status ............................................................8

Caution ...................................................................3

Compensation

principle .............................................................5

switch...........................................................8, 10

Corrected pin position...........................................12

Coupling nut............................................................9

E-field......................................................................9

Ensite......................................................................8

Exit..........................................................................8

Extrapolation...................................................10, 11

Freeze Radar Signal Processing data ..................10

Items

4Z ....................................................................12

5D ....................................................................10

CS................................................................8, 10

EX......................................................................8

FC..............................................................10, 12

PB....................................................................10

PC............................................................7, 8, 12

PP................................................................8, 12

PR......................................................................8

W2 .....................................................................8

L1, L2, L3 ............................................................... 7

Locking pin ............................................................. 9

Measured pin position .................................... 10, 11

Note........................................................................ 3

Physical pin position ......................................... 8, 12

Position

of detected peaks ............................................ 10

radar .................................................................. 8

Protection level 2 .................................................... 8

Radar zero point ..................................................... 7

Reflection diagram................................................ 11

Rotate antenna................................................. 9, 12

Threshold ............................................................. 10

Vapour influence............................................... 8, 12

Verification pin ........................................................ 5

correction..................................................... 6, 10

measuring mode................................. 6, 8-10, 12

ullage position ............................................... 7, 8

Warning .................................................................. 3

Notes


Honeywell Enraf

Delftechpark 39

2628 XJ Delft

The Netherlands

Tel: +31 (0)15-2701 100

Email: [email protected]

www.honeywellenraf.com

4416635 - Revision 2January 2009© 2009 Honeywell International Inc.

instruction manual - honeywell · instruction manual smartradar verification pin compensation page...

Documents