Isotech 970 Operating Manual

PEGASUS ’R’

MODEL 970

This manual is issued under the authority of

PEGASUS R MANUAL

ISSUE 4 - 03/01

Mr. J.P. Tavener, Managing Director

Isothermal Technology Limited

Pine Grove, Southport

Merseyside PR9 9AG

England

Tel: +44 (0) 1704 543830/544611

Fax: +44 (0) 1704 544799

www.isotech.co.uk

info@isotech.co.uk

The company is always willing to give technical advice and assistance where appropriate. Equally, because of the programme of continual development and improvement we reserve the right to amend or alter characteristics and design without prior notice. This publication is for information only.

Page 1 of 24

PEGASUS R MANUAL

CONTENTS

PAGE DESCRIPTION

3 - 4 EMC Information

5 Health and Safety Information

6 Guarantee

7 - 11 Tutorial

12 Cautionary Note

13 Figure 1

14 Black Body Target Calibration Bench - Figure 19071

ISSUE 4 - 03/01

15 Black Body Target for Pegasus Ass. Drwg. 970-20-02

16 Pegasus R T/C. Drwg. 970-20-01

17 Introduction

18 Unpacking and Initial Inspection

19 The Basic Workings of the Pegasus

20 Initial Testing

21 - 22 Maintenance

23 Assembling the Insert

24 Appendix 1 Trouble Shooting

Page 2 of 24

PEGASUS R MANUAL

ISSUE 4 - 03/01

EMC INFORMATION

This product meets the requirements of the European Directive on Electromagnetic Compatibility (EMC) 89/336/EEC as amended by EC Directive 92/31/EEC and the European Low Voltage Directive 73/25/EEC, amended by 93/68/EEC. To ensure emission compliance please ensure that any serial communications connecting leads (RS232 or RS422(485)) are fully screened.

The product meets the susceptibility requirements of EN 50082-1, criterion B.

Symbol Identification Publication Description

ISO3864 Caution

(Refer to Handbook)

IEC 417 Caution, Hot Surface

ELECTRICAL SAFETY

This equipment must be correctly earthed.

This equipment is a Class 1 Appliance. A protective earth is used to ensure the conductive parts can not become live in the event of a failure of the insulation.

The protective conductor of the flexible mains cable which is coloured green/yellow MUST be connected to a suitable earth.

The blue conductor should be connected to Neutral and the Brown conductor to Live (Line).

Page 3 of 24

PEGASUS R MANUAL

ISSUE 4 - 03/01

Warning: Internal mains voltage hazard. Do not remove the panels.

There are no user serviceable parts inside. Contact your nearest Isotech agent for repair.

Voltage transients on the supply must not exceed 2.5kV.

Conductive pollution, eg. Carbon dust, must be excluded from the apparatus. EN61010 pollution degree 2.

The apparatus has input connectors for temperature sensors, see Figure 1. This input is only suitable for a thermocouple. No other sensor or signal may be connected.

ENVIRONMENTAL RATINGS

Operating Temperature 5-50C

Relative Humidity 5-95%, non condensing

INSERT WARNING:

The inserts are specially processed for use with the Pegasus. It is important that only inserts supplied by Isothermal Technology Ltd are used. Failure to comply with this information may result to damage which would not be covered under warranty.

Page 4 of 24

PEGASUS R MANUAL

ISSUE 4 - 03/01

HEALTH AND SAFETY INSTRUCTIONS

1. Read all of this handbook before use.

2. Wear appropriate protective clothing.

3. Operators of this equipment should be adequately trained in the handling of hot and cold items and liquids.

4. Do not use the apparatus for jobs other than those for which it was designed, ie. the calibration of thermometers.

5. Do not handle the apparatus when it has hot (or cold), unless wearing the appropriate protective clothing and having the necessary training.

6. Do not drill, modify or otherwise change the shape of the apparatus.

7. Do not dismantle the apparatus.

8. Do not use the apparatus outside its recommended temperature range.

9. If cased, do not return the apparatus to its carrying case until the unit has cooled.

10. There are no user serviceable parts inside. Contact your nearest Isotech agent for repair.

11. Ensure materials, especially flammable materials are kept away from hot parts of the apparatus, to prevent fire risk.

Page 5 of 24

PEGASUS R MANUAL

ISSUE 4 - 03/01

GUARANTEE

This instrument has been manufactured to exacting standards and is guaranteed for twelve

months against electrical break-down or mechanical failure caused through defective material or workmanship, provided the failure is not the result of misuse. In the event of failure covered by this guarantee, the instrument must be returned, carriage paid, to the

supplier for examination and will be replaced or repaired at our option.

FRAGILE CERAMIC AND/OR GLASS PARTS ARE NOT COVERED BY THIS

GUARANTEE

INTERFERENCE WITH, OR FAILURE TO PROPERLY MAINTAIN THIS INSTRUMENT

MAY INVALIDATE THIS GUARANTEE

RECOMMENDATION

The life of your ISOTECH Instrument will be prolonged if regular maintenance and cleaning

to remove general dust and debris is carried out.

Serial No:.............................................

Date:.....................................................

ISOTHERMAL TECHNOLOGY LTD.

PINE GROVE,

SOUTHPORT, MERSEYSIDE

PR9 9AG

ENGLAND

TEL: +44 (0) 1704 543830/544611

FAX: +44 (0) 1704 544799

Page 6 of 24

PEGASUS R MANUAL

ISSUE 4 - 03/01

TUTORIAL

THE USE OF A PEGASUS ’R’ CALIBRATED SOURCE TO

CALIBRATE RADIATION PYROMETERS

INTRODUCTION

The Pegasus ’R’ is designed as a source for the calibration of radiation pyrometers over the

range 200°C to 1200°C. Most users of radiation pyrometers are unfamiliar with the procedures for calibration and the tutorial below is intended to help new users. It is meant only as a guide and not as a gospel.

1. SETTING UP THE SOURCE

The Pegasus 'R' comprises a small tube furnace of diameter approximately 35mm.

Separately is a 3 part assembly plus a thermocouple which assembles into the tube furnace as diagram 970-20-02.

The thermocouple, as can be seen from diagram 970-20-01 has a right-angled bend in the ceramic sheath at its tip. This bend is to facilitate insertion of the thermocouple tip into the cavity at the base of the black body target (970-01-02) see diagram 970-20-02. (The internal wires of the thermocouple may be visible at the bend in the ceramic but this is normal - the thermocouple is not broken). Once the tip of the thermocouple has been situated in the cavity of the target, the target is assembled into the well of the Pegasus. The insulation piece 970-01-03 (as shown in diagram 970-20-02) is then assembled into the Pegasus with the thermocouple alongside (which sits in the groove in the insulation piece).

The thermocouple is connected to an indicator situated on the front of the Pegasus 'R' as shown on figure 1. The size and shape of the insulation and the position of the thermocouple are all important and if the assembly is modified, the calibration certificate may become invalid. Having assembled the Pegasus 'R' a temperature is set (see commissioning later in this document).

3 steps are required to obtain the radiance temperature of the source:

a) Set the required temperature on the controller. b) Take the reading on the indicator. c) Add or subtract the correction from the calibration sheet, (correction may be

considered to vary linearly between calibration points) to obtain the radiance temperature.

For example: Say 1000°C is the controller set point. The indicated value might be 991°C. If the calibration certificate is consulted, the radiance temperature is noted to be 10°C lower than the indicated value ie. 981°C.

Page 7 of 24

PEGASUS R MANUAL

ISSUE 4 - 03/01

TUTORIAL

2. USING THE SOURCE

The simplest and least accurate method of using the source is to set its temperature, calculate its radiance temperature as described above and point the radiation pyrometer at the source.

More usually a small optical bench is built to accurately hold the source and pyrometer enabling proper alignment to take place.

3. REQUIREMENTS FOR AN OPTICAL BENCH (SEE FIG. 19071)

An optical bench can be a very expensive piece of apparatus of precision ground components, or a very basic piece of equipment built onto a wooden board.

For normal industrial pyrometers a simple bench is quite adequate. My suggestion is a slide piece to enable pyrometers of varying focal length to be calibrated and a holder for the pyrometer which allows 2 freedom of movement ie. height and lateral position.

4. A TYPICAL CALIBRATION/EVALUATION OF AN INDUSTRIAL PYROMETER

A typical calibration sequence for a land/minolta cyclops 330 is given below adapted from our UKAS submission.

DESCRIPTION

A calibrated target is used as the source of information, together with the certificate of calibration - see ref NPL 12317/91/001 dated 15.5.1991.

An optical bench was built (see drawing 19071) which allowed a Land Cyclops 330 to be calibrated.

The optical bench allowed 3 freedom of movements:-

BACK & FORTH

The distance to the cyclops transfer standard from the rear of the Black Body is 750mm. An optical bench allows the cyclops transfer standard to be moved from 660mm to 1000mm.

Page 8 of 24

+ 16 hidden pages