Isotech 17702W User Maintenance Manual/Handbook
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Isotech 17702W User Maintenance Manual/Handbook

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HEATPIPE FURNACE
FOR MODELS
17702W 17702P 17702S
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.
Page 1 of 48
Heatpipe Furnace Models 17702W, 17702P, 17702S (12–01/18)

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  • Page 1 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.
  • Page 2 Isothermal Technology Limited Pine Grove, Southport, Merseyside, PR9 9AG, England Telephone: +44 (0)1704 543830/544611 / Fax: +44 (0)1704 544799 Email: info@isotech.co.uk / Website: www.isotech.co.uk Page 2 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 3: Table Of Contents

    To edit an existing PROGRAM: .......................... 26 Using the HOLDBACK feature: ........................... 27 CONNECTING THE FURNACE TO A LIQUID COOLANT SUPPLY (NOT REQUIRED FOR MODEL 17702W) ..28 CALIBRATION APPARATUS FOR ZINC, ALUMINIUM AND SILVER FIXED POINTS ........... 29 GENERAL ASSEMBLY OF FIXED POINT CELL INSIDE THE HEATPIPE ............29 INTRODUCTION ..............................
  • Page 4 DEFINING FIXED POINTS AND RELATED DATA ....................40 GENERAL NOTE ON ISOTECH METAL FREEZE POINT CELLS ................41 PRECAUTIONS TO PREVENT DEVITRIFICATION OF QUARTZ ENVELOPES ............ 42 GENERAL COMMENT .............................. 43 SEALED METAL FREEZING POINT CELL ....................... 44 SEALED METAL FREEZING POINT CELL BODY DIMENSIONS ................45 ACKNOWLEDGEMENT .............................

  • Page 5: Emc Information

    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.

  • Page 6: Health And Safety Instructions

    If cased, do not return the apparatus to the carrying case until the unit has cooled. There are no user serviceable parts inside. Contact your nearest Isotech agent for repair. Ensure materials, especially flammable materials are kept away from hot parts of the apparatus, to prevent fire risk.

  • Page 7: Unpacking

    Gently lift the transit clamp vertically; the attached tube and rubber securing block will thereby be extracted from the furnace core. Normal commissioning procedure may now be followed. Keep the transit clamp and use it if the furnace is ever transported. Page 7 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 8: Installation Of The Thermometer Support (Removed For Transit)

    Please screw the thermometer support to the furnace in the way shown above using the screws supplied. Tighten sufficiently. Please take care when inserting or removing thermometers from the pocket below the support. Page 8 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 9: Safety

    The fuse holders will be seen at the lower right-hand side of the cabinet. The left-hand fuse holder will always contain a fuse. The right-hand fuse holder will leave Isotech with a neutral shorting bar, they are clearly labelled. 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.

  • Page 10: General Layout

    GENERAL LAYOUT Front View USB socket Ethernet socket Main controller Overtemperature controller Mains power on switch Top View Heatpipe furnace Pre-warming pocket Page 10 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)
  • Page 11 Rear View Cooling coil connection (not on W version) Cooling coil connection (not on W version) Mains Power cable Page 11 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 12: Introduction

    Simple Use - no zone offsets to adjust Isotech metrology furnaces have more than 35 years of proven use and are widely used by the worlds’ leading NMIs. For the optimal use of fixed point cells, the temperature uniformity should be less than 10mK over the length of the fixed point sample CCT/2000-13, “Optimal Realization of the Defining Points of the...

  • Page 13: The Heatpipe Furnaces

    MODEL 17702S 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. Page 13 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 14: Using The Overtemperature Controller

    5. If the controller is in the alarm condition and the complete furnace is powered down, the controller will “remember” the condition and will still need to be manually reset when powered up again Page 14 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 15: Quick Start

    “dried out” by running at a low value such as 400/450°C for a period of several hours. 100°C for W version 150°C for W version Page 15 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 16: Using The Controller

    Configuration changes to the controller require you log in as “Engineer” to perform these functions. These include: • Change language selection • Change °C to °F or K • Change equipment clock and time zone Page 16 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 17: How To Log In As The Supervisor

    8. Select Yes and enter with SCROLL button to display the ENGINEER screen 9. When logged in as the ENGINEER, the equipment will not control the temperature of the heat source Page 17 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 18: The Isotech Splashscreen And Controls

    UP button The USER ACCESS page: Heatpipe autotune feature IP type (toggle between fixed and DHCP) PB adjust TI adjust TD adjust Controller filter time adjust Global UNITS adjustment Page 18 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 19: Principle Of Operation

    8 point adjustment curve for each furnace. See section below for details on how to do this. To change the Setpoint of the equipment: From the ISOTECH homepage, press the SCROLL button once, this will highlight the SETPOINT ADJUST box.

  • Page 20: Process To Apply A User Linearization To The Heatpipe Furnace

    Scroll to the CHANNELS tab and enter with the SCROLL button Select CHANNEL 1 Scroll to the ISOTECH tab and enter with the SCROLL button Scroll to CAL STATUS and enter with the SCROLL button Scroll to POINT 1 and enter the value from the reference thermometer The controller is now ready to accept a value.

  • Page 21: Enabling The Autotune Feature

    The controller will now begin the tuning process During the tuning process, AT can now be seen to the left of the clock on the ISOTECH homepage. To disable the tuning feature during a tune, repeat the process above and select OFF. This will now disable the tune and install the previous values.

  • Page 22: To Change The Date And Time Or Language

    Log in as the SUPERVISOR Plug a suitable USB memory stick to the socket on the control panel Ensure the controller has accepted the memory stick by the icon in the lower left of the ISOTECH homepage Press the page button to scroll to the SUPERVISOR menu...

  • Page 23: Ftp Server Archiving

    USB memory stick and imported from there via the USB socket on the controller panel Instructions and details of installation are supplied with the download. Page 23 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 24: To Create, Install And Run A Program Via The Controller Interface Please Follow The Instructions Below

    High: Holdback is entered when PV > (PSP + Holdback Value) Band: Holdback is entered when PV < (PSP - Holdback Value) or PV > (PSP + Holdback Value) Page 24 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 25: How To Create A Simple Program Using The Controller Interface

    As for ‘Ch1 Ramp Units’ above. How to create a simple PROGRAM using the controller interface: Below shows a basic PROGRAM that demonstrates the furnace instrument ability to create a program. Page 25 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 26: To Enable/Run This Program

    The soft keyboard will open allowing you to save the file as a filename of your choice When the name is selected, press the PAGE button to save the changes Both the original file and the modified file will now exist in the memory Page 26 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 27: Using The Holdback Feature

    Scroll to CH1 HOLDBACK and enter the desired parameter and enter with the SCROLL button Scroll to CH1 HOLDBACK VAL and select the desired temperature, enter using the SCROLL button Page 27 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 28: Connecting The Furnace To A Liquid Coolant Supply (Not Required For Model 17702W)

    The cooling coil is accessed from the rear panel and this will need to be removed to make any connections or service of the connections. The cooling medium can be any number of substances, but in most cases water will suffice. Isotech would recommend a cooled re-circulation system for environmental reasons, however, a simple connection to a water tap will produce the same results.

  • Page 29: Calibration Apparatus For Zinc, Aluminium And Silver Fixed Points

    DESCRIPTION Sufficient information now exists at Isotech to allow introduction of a new apparatus, specifically designed not only to realise and maintain the ITS 90 fixed points of zinc, aluminium and silver, but also to pre- and post-condition the thermometers to be calibrated.

  • Page 30: Method Of Operation

    Throughout the time the thermometers are above 450°C the temperature changes are slow enough to prevent strain, and the slow flow of air prevents contamination at high temperatures. Page 30 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 31: Calibration Apparatus For Aluminium, Silver And Copper Fixed Points

    DESCRIPTION Sufficient information now exists at Isotech to allow introduction of a new apparatus, specifically designed not only to realise and maintain the ITS-90 fixed points of aluminium, silver and copper, but (housed in the same facility) incorporating a second furnace which, because of its design, can be used safely and without contamination, to pre-heat and anneal the thermometers for calibration.

  • Page 32: Calibration Apparatus For Indium And Tin Fixed Points

    400 and 700°C. DESCRIPTION The new calibration apparatus developed by Isotech not only allows you to create and maintain the ITS 90 freezing points of indium and tin using a water heat-pipe, but also provides a second furnace for annealing thermometers at temperatures up to 700°C.

  • Page 33: Eliminating Contamination During The Calibration Of High Temperature Thermometers

    0.5mK equivalent. Instructions in the Isotech 962 and 96178 thermometer manuals explain how to handle and keep clean the thermometers. It is imperative that procedures are followed because contaminants can penetrate and pass through physically-intact quartz sheaths at temperatures above 800°C.

  • Page 34: Cell Handling

    CELL HANDLING In order to facilitate introduction to, and removal from the furnace, Isotech can provide for each cell, supplementary equipment largely comprising an Inconel basket with detachable handle. To prevent the cell-surface becoming discoloured, it is recommended that, before using the cell, the basket and insulation be placed in the furnace and the furnace be taken to above the cell working temperature for at least 2 hours.
  • Page 35 Page 35 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)
  • Page 36 Page 36 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)
  • Page 37 Page 37 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 38: Thermometric Fixed Points; A Tutorial

    This melt plateau can last for a considerable period of time. When melting is complete, the cell temperature will rise to the furnace temperature. Page 38 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)
  • Page 39 1 standard atmosphere pressure, for the various metals (and for mercury and water at their triple points), are given in the table. For a given column height (of the order of 200mm for Isotech sealed freeze point cells), the correction will be proportional to metal density and to a coefficient expressing the sensitivity to pressure of the phase-change temperature.

  • Page 40: Defining Fixed Points And Related Data

    Furnace with potassium heat-pipe for zinc freezing point. Furnace with either potassium or sodium heat-pipe at aluminium and silver freezing points. Page 40 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 41: General Note On Isotech Metal Freeze Point Cells

    GENERAL NOTE ON ISOTECH METAL FREEZE POINT CELLS Isotech freeze point cells contain metal that is 99.9999+% pure, except that aluminium cells may be filled with metal not less than 99.999% pure, depending upon the availability of aluminium in suitable physical form.

  • Page 42: Precautions To Prevent Devitrification Of Quartz Envelopes

    PRECAUTIONS TO PREVENT DEVITRIFICATION OF QUARTZ ENVELOPES The crucibles (containing the metal) of Isotech sealed fixed point cells are encased in an envelope of pure fused quartz, whose purpose is to avoid contamination of the enclosed metal, by foreign metal ions or oxygen.

  • Page 43: General Comment

    Before relying upon measurements made in them, the operator should perform enough freezes to become familiar with the cell, furnace, control, monitoring thermometer and readout (as a system) to ensure that the melt is clearly identifiable and sufficiently consistent. Page 43 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 44: Sealed Metal Freezing Point Cell

    SEALED METAL FREEZING POINT CELL High-purity graphite crucible and cover High-purity graphite sleeve High-purity metal Fused-quartz envelope, filled to give a pressure of 1 standard atmosphere at the metal freezing temperature. Page 44 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 45: Sealed Metal Freezing Point Cell Body Dimensions

    SEALED METAL FREEZING POINT CELL BODY DIMENSIONS Page 45 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 46: Acknowledgement

    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. Page 46 of 48 Heatpipe Furnace Models 17702W, 17702P, 17702S (13–07/20)

  • Page 47: Isotech I-Cal Easy

    This application allows logging of data from the furnace. Additionally, if a license is purchased it allows for fully automatic calibration including certificate printing and the calculation of coefficients. Refer to the Isotech I-Cal EASY handbook and help system for more details PROGRAM EDITOR This allows set point programs to be created on a PC and uploaded to the furnace.

  • Page 48: Review

    The user name and password are both ‘history and they are not editable. These applications can be downloaded from the Isotech website http://www.isotech.co.uk/downloads Connection to the unit is via the Ethernet interface, configure the IP address to suit your network and then select that IP address in the software.

This manual is also suitable for:

17702p17702s

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