Isotech M17705, M17706, M17707 User Maintenance Manual/handbook
Page 1 of 40
Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
DUAL FURNACE
FOR MODELS
M17705, M17706 & M17707
User Maintenance Manual/Handbook
Isothermal Technology Limited, Pine Grove, Southport, PR9 9AG, England
Tel: +44 (0)1704 543830 Fax: +44 (0)1704 544799 Internet: www.isotech.co.uk E-mail: 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.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
CONTENTS
GUARANTEE ................................................................................................................................................................ 3
EMC INFORMATION .......................................................................................................................................... 4
ELECTRICAL SAFETY .......................................................................................................................................... 4
HEALTH AND SAFETY INSTRUCTIONS ................................................................................................................... 5
DUAL FURNACE CERTIFICATE OF TEST ................................................................................................................. 6
UNPACKING ................................................................................................................................................................ 7
SAFETY ......................................................................................................................................................................... 8
CAUTIONARY NOTE .............................................................................................................................................. 8
THIS EQUIPMENT MUST BE EARTHED ................................................................................................................ 8
FUSE AND NEUTRAL LINK REPLACEMENT ........................................................................................................ 8
INTRODUCTION ........................................................................................................................................................ 9
THE 3 DUAL FURNACES .......................................................................................................................................... 10
MODEL 17707 ........................................................................................................................................................ 10
MODEL 17706 ........................................................................................................................................................ 10
MODEL 17705 ........................................................................................................................................................ 10
OPERATIONAL CONVENIENCE ............................................................................................................................. 11
ACKNOWLEDGEMENT ............................................................................................................................................ 12
COMMISSIONING ..................................................................................................................................................... 13
MODEL 17707 WATER HEAT-PIPE FURNACE ........................................................................................................ 14
FINAL PART OF THE COMMISSIONING INSTRUCTIONS ................................................................................ 14
NEXT GENERATION CALIBRATION APPARATUS FOR INDIUM AND TIN FIXED POINTS ............................. 15
INTRODUCTION .................................................................................................................................................. 15
DESCRIPTION ........................................................................................................................................................ 15
METHOD OF OPERATION ................................................................................................................................... 15
SPECIFICATION ........................................................................................................................................................ 16
HOW TO ORDER .................................................................................................................................................. 16
THE POTASSIUM HEAT-PIPE FURNACE, MODEL 17706 ...................................................................................... 17
FINAL PART OF THE COMMISSIONING INSTRUCTIONS ................................................................................ 17
NEXT GENERATION CALIBRATION APPARATUS FOR ZINC, ALUMINIUM AND SILVER FIXED POINTS ..... 18
INTRODUCTION .................................................................................................................................................. 18
DESCRIPTION ........................................................................................................................................................ 18
METHOD OF OPERATION ................................................................................................................................... 18
SPECIFICATION ........................................................................................................................................................ 19
THE SODIUM HEAT-PIPE FURNACE, MODEL 17705 ............................................................................................ 20
FINAL PART OF THE COMMISSIONING INSTRUCTIONS ................................................................................ 20
NEXT GENERATION CALIBRATION APPARATUS FOR ALUMINIUM, SILVER AND COPPER FIXED POINTS 21
INTRODUCTION .................................................................................................................................................. 21
DESCRIPTION ........................................................................................................................................................ 21
METHOD OF OPERATION ................................................................................................................................... 21
SPECIFICATION ........................................................................................................................................................ 22
ELIMINATING CONTAMINATION DURING THE CALIBRATION OF HIGH TEMPERATURE THERMOMETERS23
ANNEALING COMPONENT OF THE DUAL FURNACE SHOWING AIR FLOW.............................................. 23
MAINTENANCE ........................................................................................................................................................ 25
SPARE PARTS ............................................................................................................................................................. 26
CELL HANDLING ...................................................................................................................................................... 27
CELL KIT................................................................................................................................................................. 27
THERMOMETRIC FIXED POINTS; A TUTORIAL .................................................................................................... 31
DEFINING FIXED POINTS AND RELATED DATA ................................................................................................. 33
GENERAL NOTE ON ISOTECH METAL FREEZE POINT CELLS ........................................................................... 34
PRECAUTIONS TO PREVENT DEVITRIFICATION OF QUARTZ ENVELOPES .................................................... 35
GENERAL COMMENT .............................................................................................................................................. 36
ADDITIONAL SERVICES AND INFORMATION ...................................................................................................... 37
FIGURE 1; SECTION THROUGH DUAL FURNACE ............................................................................................ 38
FIGURE 2; SEALED METAL FREEZING POINT CELL .......................................................................................... 39
FIGURE 3; SEALED METAL FREEZING POINT CELL BODY DIMENSIONS ...................................................... 40
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
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.
We recommend that this instrument to be re-calibrated annually.
ISOTHERMAL TECHNOLOGY LTD.
PINE GROVE, SOUTHPORT
PR9 9AG, ENGLAND
TEL: +44 (0) 1704 543830/544611
FAX: +44 (0)1704) 544799
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 4 of 40
Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
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 are
fully screened.
The product meets the susceptibility requirements of EN 50082-1, criterion B.
Symbol Identification
Publication
Description
ISO3864
Caution (refer to manual)
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 cannot 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).
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, e.g. Carbon dust, must be excluded from the apparatus. EN61010 pollution degree 2.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
HEALTH AND SAFETY INSTRUCTIONS
1. Read this entire manual 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, i.e. the calibration of
thermometers.
5. Do not handle the apparatus when it is 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.
12. Ensure adequate ventilation when using oils at high temperatures.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
DUAL FURNACE CERTIFICATE OF TEST
Serial No:
Prior to despatch the following tests were carried out.
Insulation Test MΩ Date
Earth Impedance Ω Date
Temperature cycle to maximum temperature Date
Communications test (if applicable) Date
Laboratory test at °C
Comments or concessions
Controller parameters are listed in an appendix of the manual
The above Serial No. Furnace was tested as above and found to comply with the specifications.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
UNPACKING
EVERY EFFORT HAS BEEN MADE TO PACKAGE THIS UNIT FOR TRANSPORT AND TO ENSURE ITS GOOD
CONDITION ON ARRIVAL AT ITS DESTINATION.
BEFORE COMMISSIONING IT IS NECESSARY TO REMOVE THE FURNACE CORE TRANSIT CLAMP. TO AVOID
DAMAGE PLEASE FOLLOW INSTRUCTIONS:
1. Slacken the central nut using the required tube spanner; the insertion of a screwdriver through the tube
spanner will prevent the central stud turning.
2. Remove the 3 screws securing the transit clamp to the top of the unit. Slacken each screw by degrees
equally.
3. Gently lift the transit clamp vertically; the attached tube and rubber securing block will thereby be extracted
from the furnace core.
4. Normal commissioning procedure may now be followed.
5. Keep the transit clamp and use it if the furnace is ever transported.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
SAFETY
CAUTIONARY NOTE
Products of Isothermal Technology Ltd are intended for technically trained and competent personnel familiar with
good laboratory practice. It is expected that personnel using this equipment will be knowledgeable and skilful in the
management of apparatus which may be under power or under extremes of temperature (molten metals, cryogenic
liquids, etc.) and will appreciate the hazards which may be associated with, and the precautions to be taken with,
such equipment.
THIS EQUIPMENT MUST BE EARTHED
The furnace is supplied with a fuse carrier fitted with a neutral link. This is clearly labelled and is for use with a mains
system with a neutral line, such as the UK supply. If the furnace is to be used on a system where both supply lines
are live with respect to earth then the neutral fuse link should be replaced with a fuse. A spare fuse is supplied with
the furnace.
FUSE AND NEUTRAL LINK REPLACEMENT
Hazardous voltages are exposed when the rear furnace panel is removed. Before removing the panel you must
isolate the furnace from the electrical supply. To replace the main electrical fuse or to replace the neutral link bar it
is necessary to remove the rear panel; see warning above. The panel will become free after the four corner screws
are removed.
The fuse holders will be seen at the lower right hand side of the cabinet. The black fuse holder will always contain a
fuse. The white fuse holder will leave Isotech with a neutral shorting bar. As explained elsewhere, if your local supply
does not have a neutral line but has both lines live with respect to earth this link should be replaced with a fuse and
the holder labelled to this effect.
The top half of the fuse carrier pulls free from the lower body.
Two spare fuses are supplied with the furnace; they are type A2 and have a rating of 10A for the low and medium
temperature furnace and 32A for the high temperature furnace.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
INTRODUCTION
The Dual Furnace range of calibration apparatus comprises 3 models, all working on the same principle and having
the following features in common:
1. A rack for storage, at around room temperature, of up to 4 thermometers. Lined with ceramic board, the
rack will not be damaged if very hot thermometers are placed in it.
2. A furnace of diameter 50mm and depth 400mm which can be used to pre-warm or anneal up to 4
thermometers.
3. A pre-calibration pocket to install a single thermometer immediately prior to calibration or to house the
monitor thermometer between periods of use.
4. A heat-pipe furnace to create optimal conditions for an appropriate range of fixed point cells. The use of
freeze-point cells within the heat pipe is described in the manual which accompanies Isotech cells.
All 4 features are built into one cabinet, making the dual furnace a self-contained calibration facility.
Both component furnaces of the dual furnace can be fitted with communications interfaces for automated use.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
THE 3 DUAL FURNACES
MODEL 17707
Contains a water heat pipe, giving an operational temperature range from 125°C to 250°C and thus making it an ideal
system for realisation of Indium and Tin freeze points.
Its annealing furnace has a temperature range from near ambient up to 700°C.
MODEL 17706
Contains a potassium heat pipe with a temperature range from 400°C to 1000°C, thus encompassing Zinc,
Aluminium and Silver freeze points.
Its annealing furnace has a temperature range from near ambient to 950°C.
MODEL 17705
Contains a sodium heat pipe with a temperature range from 450°C to 1100°C, thus constituting a facility for
Aluminium, Silver, Gold and Copper freeze point measurements.
Its annealing furnace has a temperature range from near ambient to 950°C.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
OPERATIONAL CONVENIENCE
Until the advent of the dual furnace, the handling of thermometers was treated as a separate problem, or ignored.
With the dual furnace, thermometers can be stored, pre-warmed, calibrated and annealed in one comprehensive
facility, without introducing contamination or strain.
The two furnaces in each dual furnace have independent temperature controllers and independent adjustable overtemperature cut-outs for added security. These features are shown in the wiring diagram.
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Dual Furnace Models M17705, N17706 & 17707 Iss.09 – 12/14
ACKNOWLEDGEMENT
The Isotech dual furnace owes its origin to Dr. P. Marcarino of Italy. His research and development solved many of
the problems of contamination and handling of high temperature thermometers.
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