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Isotech 465 User Maintenance Manual/Handbook

3 zone metrological furnace
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3 ZONE METROLOGICAL
FURNACE MODEL 465
User Maintenance Manual/Handbook
This manual refers to the following cells:
Zinc Freeze-Point Cell
Antimony Freeze-Point Cell
Aluminium Freeze-Point Cell
Silver Freeze-Point Cell
Gold Freeze-Point Cell
Copper Freeze-Point Cell
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 45
3 Zone Metrological Furnace 465 Iss.13 – 11/16

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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 SERVICING THE 3 ZONE METROLOGICAL FURNACE ................. 37 THERMOMETRIC FIXED POINTS - A TUTORIAL ..................38 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 ADDITIONAL SERVICES AND INFORMATION .....................

  • Page 3: 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. ISOTHERMAL TECHNOLOGY LTD.

  • Page 4: Emc Information

    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 Page 4 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 5: Electrical Safety

    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 its 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: Cautionary Note

    TO REPLACE THE MAIN ELECTRICAL FUSE OR TO REPLACE THE NEUTRAL LINK IT IS NECESSARY TO REMOVE THE REAR PANEL, SEE WARNING ABOVE. THE PANEL WILL BECOME FREE AFTER THE FOUR CORNER SCREWS ARE REMOVED. TWO SPARE FUSES ARE SUPPLIED WITH THE FURNACE. Page 7 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 8: Introduction

    Three zone furnaces can offer wider operating ranges and still meet the requirements for “Optimal Realization of the Defining Points of the ITS-90...” CCT/2000-13. In place of a heat pipe the Model 465 3 Zone High Temperature Furnace uses top and bottom zone heaters to minimize temperature gradients.

  • Page 9: New Features

    An Ethernet interface allows the furnace temperature to be monitored across a network whilst a USB Interface allows programs to be copied or for the furnace heat up and cool down history to be exported. Page 9 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 10: General Layout

    GENERAL LAYOUT Figure 1: Front View: Figure 2: Top View: Page 10 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 11 Figure 3: Rear View: Page 11 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 12: Connecting The Furnace To A Liquid Coolant Supply

    The cooling coil is accessed from the rear panel (Figure 3) 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 13: Quick Start

    On the second press the furnace will make a noise as the main control circuit powers up. The main controller will now boot up, starting with the ISOTECH splashscreen. The furnace is now active and ready for use. On the main controller, press the SCROLL button to highlight the Setpoint box (Figure 8).

  • 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 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 15: Using The Controller

    8. Select Yes and enter with SCROLL button to display the SUPERVISOR screen (Figure 6) 9. When logged in as the SUPERVISOR the equipment will control in the normal way Page 15 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 16: How To Log In As The Engineer

    The HOME page: Figure 8 Furnace temperature Furnace setpoint Bottom Zone temperature Setpoint adjust box Top Zone temperature Data Record indication PAGE button SCROLL button DOWN button UP button Page 16 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 17: The User Access Page

    To change the Setpoint of the equipment: 1. From the ISOTECH homepage, press the SCROLL button once, this will highlight the SETPOINT ADJUST box. 2. Press the SCROLL button once more and this will allow adjustment of the setpoint via the UP/DOWN buttons.

  • Page 18: How To Globally Change From °C To °F Or Kelvin

    This will need to be regularly checked for errors and can easily be corrected within the controller using the following procedure. Figure 11: illustrates a simplified graphical view of the process. Isotech standard offset values are set at the following temperatures: 1. 230°C 2. 440°C 3.
  • Page 19 8. Scroll to the ISOTECH tab and enter with the SCROLL button 9. Scroll to CAL STATUS and enter with the SCROLL button 10. Scroll to POINT 1 and enter the value from the reference thermometer The controller is now ready to accept a value. Ensure the equipment is thermally stable, you will now need to use the temperature value displayed by the reference thermometer.

  • Page 20: Enabling The Autotune Feature

    6. 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 21: The Network Interface

    1. Log in as the SUPERVISOR 2. Plug a suitable USB memory stick to the socket on the control panel 3. Ensure the controller has accepted the memory stick by the icon in the lower left of the ISOTECH homepage 4.

  • Page 22: Ftp Server Archiving

    The programs can either be created using the available software, or using the control interface on the equipment. The software can be downloaded at http://www.isotech.co.uk/downloads. Once created, a program can be sent directly to the instrument via the network connection or saved to a USB memory stick and imported from there via the USB socket on the controller panel.
  • Page 23 Select ‘Per Second’, ‘Per Minute’ or ‘Per Hour’ for ramp timing units. Ramp Units can be edited only when the program is in Reset mode. Ch2 Ramp Units As for ‘Ch1 Ramp Units’ above. Page 23 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 24: How To Create A Simple Program Using The Controller Interface

    12. Press SCROLL once to highlight the RESET box 13. Scroll to TEST_1 and press the SCROLL button to initiate the program The page will now change to show the current program running. Page 24 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 25: To Edit An Existing Program

    Holdback can be configured to hold either the segment or the complete program. The USER defined value is used to define the actual value applied to it. Page 25 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 26 4. Scroll to CH1 HOLDBACK and enter the desired parameter and enter with the SCROLL button 5. Scroll to CH1 HOLDBACK VAL and select the desired temperature, enter using the SCROLL button Page 26 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 27 High-purity graphite sleeve High-purity metal Fused-quartz envelope, filled to give a pressure of 1 standard atmosphere at the metal freezing temperature Sealed Metal Freezing-Point Cell Body Dimensions Figure 16: Page 27 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 28 Furnace and Holder Diagram Figure 17: Page 28 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 29 Page 29 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 30 Page 30 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 31: Realising The Following Fixed Points: Tin, Lead, Zinc, Antimony, Aluminium, Silver, Gold And Copper

    Th , etc. At the temperatures of Tin, Lead and Zinc it is generally permissible to withdraw a thermometer, of type Isotech 909, directly into room temperature. After exposure to Aluminium and Silver point temperatures, the thermometer must be cooled slowly to 450°C.

  • Page 32: Freezing The Tin Cell

    After 2 minutes remove the rod and replace the thermometer. When the monitoring thermometer has shown no change for some minutes, the plateau has been achieved. A typical melt/freeze sequence is shown in Figure 18. Page 32 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 33: A Useful Hint

    There follows later a tutorial about Fixed Points. Page 33 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 34 Depth of supercool (particularly pronounced for Tin) Plateau showing constant temperature during freeze Temperature drop at end of freeze plateau down to the set point of the furnace controller Page 34 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 35: Maintenance

    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 36: Spare Parts

    SPARE PARTS Silicon Carbide Pre-Heat Tube 19½” 935-29-20 High Temperature Kaowool Insulation 932-20-43 Middle Ceramic 465-03-10 Lower Ceramic (x2) 465-03-11 Upper Ceramic 465-03-09 Page 36 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 37: Servicing The 3 Zone Metrological Furnace

    SERVICING THE 3 ZONE METROLOGICAL FURNACE No regular servicing is required. Page 37 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 38: Thermometric Fixed Points - A Tutorial

    Page 38 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...
  • Page 39 1 standard atmosphere pressure, for the various metals (and for mercury and water at their triple points), are given in the table on page 26. 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 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

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

    (for example, 14 SWG Nichrome) may be temporarily attached, for use in the 3 Zone Furnace Model 465, the cell holder is inconel. (For use in the 465 furnace the inconel basket for Aluminium, Silver and Copper has an earth lead attached which must be connected during use to the connector provided on the furnace) see diagram.

  • 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. To this end, it contains an inert gas whose pressure is 1 standard atmosphere at the metal freezing temperature.

  • Page 43: General Comment

    (as a system) to ensure that the plateau is clearly identifiable and sufficiently consistent. Page 43 of 45 3 Zone Metrological Furnace 465 Iss.13 – 11/16...

  • Page 44: Additional Services And Information

    ADDITIONAL SERVICES AND INFORMATION Isotech operates one of the world’s most comprehensive UKAS supervised Laboratories. Training is available to customers at an agreed daily rate. The Isothermal Journal of Thermometry is a must for all Laboratory Managers and is available for purchase.

  • Page 45: Isotech I-Cal Easy

    This application allows logging of data from the ADVANCED model. 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...

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