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Isotech 970-1 Instruction Manual

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MODEL 970-1 & 970-2
CALIBRATION FURNACE
INSTRUCTION MANUAL
_____________________________________________________________________
Isotech North America
158 Brentwood Drive, Unit 4
Colchester, VT 05446
Phone: (802) 863-8050
Fax:
(802) 863-8125
sales@isotechna.com
www.isotechna.com

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  • Page 1 MODEL 970-1 & 970-2 CALIBRATION FURNACE INSTRUCTION MANUAL Isotech North America 158 Brentwood Drive, Unit 4 Colchester, VT 05446 Phone: (802) 863-8050 Fax: (802) 863-8125 sales@isotechna.com www.isotechna.com _____________________________________________________________________...
  • Page 2 M970-07/04 PAGE 1 MODEL 970-1 & 970-2 CALIBRATION FURNACE ______________________________ 1200 Deg.C. Three Zone Horizontal Tube Temperature Calibration Furnace Instruction Manual...

  • Page 3: Table Of Contents

    M970-07/04 PAGE 2 CONTENTS Section Description Page No. Warranty Operational Safety Health & Safety Instructions Product description 6 /7 Product Features Product Specifications 9 / 10 Theory of Operation 11 / 12 Unpacking, Inspection and Assembly Furnace Installation Electrical Supplies Furnace Operation &...

  • Page 4: Warranty

    M970-07/04 PAGE 3 1.Warranty This instrument has been manufactured and tested in accordance with the manufacturer’s specification and quality control procedures. It was inspected & tested to safety standards for electrical insulation, earth impedance and is fully compliant with electrical safety class 1, under IEC 1010-1.

  • Page 5: Operational Safety

    M970-07/04 PAGE 4 2. Operational Safety Personnel using this equipment must be trained in its use and good measurement practice. It is essential personnel understand the hazards of this equipment when operating at high temperatures (100 to 1200 deg.C.) and precautions needed in its use. Refer to safety features section 13 and the Health and Safety instructions section 3.

  • Page 6: Health And Safety Instructions

    M970-07/04 PAGE 5 3. Health and Safety Instructions (1) This manual must be read completely. (2) This product must be electrically and mechanically installed correctly as detailed in this manual with correct safety features being used (section 3 &13) (3) Safety notices warning of high temperature must be clearly visible and any necessary barriers installed to prevent accidental touching / burns by laboratory/operational staff when operating at high temperatures above 300 deg.C.

  • Page 7: Product Description

    3ins. Diameter. (2) Model 970-1. This uses an additional centre work tube within the main tube. This tube is supported by the insulated separate outer end furnace plates shown. This provides improved horizontal heat uniformity along the furnace length.

  • Page 8: M970

    M970-07/04 PAGE 7 This separate centre work tube is normally 2.55ins. internal diameter (65mm) and can be used with metal equalizing blocks up to 2.3 ins. Diameter (58mm) for mounting probes to calibrate. This smaller diameter / area work tube maintains a lower horizontal uniformity over the temperature range using a metal equalizing block of 200 to 250mm.length.

  • Page 9: Product Features

    M970-07/04 PAGE 8 8. Product Features (1) Wide temperature range (100 to 1200 deg.C). (2) High stability and low thermal gradient temperature source for calibration by comparison. (3) For use with wide range of sensors including large metal sheathed sizes to over 0.75 ins.

  • Page 10: Product Specifications

    M970-07/04 PAGE 9 6.Product Specifications Model 970-2 Model 970-1 (1) Temperature Range : deg.C. 100 to 1200 100 to 1200 : deg.F. 200 to 2190 200 to 2190 (2) Temperature Stability :100 to 800 deg.C. within :- 0.1 deg.C. 0.05 deg.C.
  • Page 11 M970-07/04 PAGE 10 Model 970 – 2 and 970 – 1 (8) Temperature control Centre zone master controller with input range 0 to 1200 degC. 2 x end zone “slave” controllers with input differential range of +/- 7 mV. (+/-200 deg.C.) (9) Over temperature trip controller :- 0 to 1200 deg.C.

  • Page 12: Theory Of Operation

    7. Theory of Operation Furnace Control As illustrated in Appendix 1 the 970-1 and 970-2 horizontal tube furnaces are divided into 3 heated zones, each with its own temperature controller and thermocouple for measuring and control. The centre zone operates independently as the “master” control to maintain the furnace centre at its desired set point control value.
  • Page 13 M970-07/04 PAGE 12 The operating supply input can be 3 phase 110 V. per phase at 16 amps for the end zone and 13.5 amps for the centre zone. This is fed through a 3 pole latching 20 A. per line isolation relay to each of the 3 furnace heater zones via the series “regulator”...

  • Page 14: Unpacking, Inspection And Assembly

    Insurance assessor. Furnace Assembly 970-1 furnace using separate internal work tube. Unpack and insert tube carefully into centre of the main furnace tube, cleaning to remove any packing material or dust. Ensure main furnace work tube has no packing material particles, removing and cleaning inside of tube.

  • Page 15: Furnace Installation

    M970-07/04 PAGE 14 9. Furnace Installation. Install on a solid, stable surface / bench with adequate space for ventilation (minimum 24 ins. on both sides and 40 ins. above furnace) Allow sufficient end space for loading maximum probe length with a minimum distance to any other instruments or wall of 30 ins.

  • Page 16: Electrical Supplies

    M970-07/04 PAGE 15 10. Electrical Supplies / Connections. Ensure local supply line, wall socket or break-out box is available for correct rating of supply to be used. (3 phase 190 V. 5 kW. – 110 V. per phase, star with neutral and earth / ground connection OR single phase 110 V.

  • Page 17: Furnace Operation & Calibration

    (up to 2.55 ins. Diameter) in the separately mounted model 970-1 furnace tubes. The large 3 ins. Diameter blocks are used when large capacity calibration is required or for large head and short probe designs.
  • Page 18 M970-07/04 PAGE 17 Monitor the furnace temperature using the standard reference probe on the measuring instrument or plot as a graph using PC soft-ware. When final temperature stabilization is re ached the end zones should be in control with their control lamps blinking to indicate an average control power input to the furnace end zones.

  • Page 19: Calibration Performance Optimization

    M970-07/04 PAGE 18 12.Calibration Performance Optimization The horizontal profile of the furnace should be carefully monitored over the length of any equalization blocks under the standard test conditions for the probes used and the end zone insulation. Short probes calibrated using the equalization blocks closer to the furnace end, will need more care to obtain the maximum insulation / lowest end loss with adjustment of the particular furnace end controller used to obtain the lowest gradient.

  • Page 20: Safety Features

    M970-07/04 PAGE 19 13. Safety Features This furnace is protected with electrical safety features to trip the supply on continuous overload or short circuit. The thermal heating is protected by an independent over-temp cut-out to trip the supply. For personal safety, we strongly recommend the use of protective clothing including face masks or goggles.

  • Page 21: Automatic Calibration & Furnace Control

    M970-07/04 PAGE 20 14.Automatic Calibration and Furnace Control Refer to Appendix 7 furnace automatic calibration system diagram. This furnace can be used with the TTI7 PRT / TC multichannel digital thermometer or DVM’s / Scanner systems, in order to automatically ramp the furnace to several pre-set control temperatures .

This manual is also suitable for:

970-2

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