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FLUIDISED CALIBRATION
BATH MODEL 875
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 39
Fluidized Calibration Bath Model 875 Iss.06 – 09/13
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Summary of Contents for Isotech 875
- 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.
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Page 2: Table Of Contents
Figure 3: Fluidised Bath Equalising Block Handbook Assembly ....................36 Figure 4: Test of Equalising Block Assembly ..........................37 Calibration Tube ..................................38 Front & Rear Elevation of 875 Fluidised Bath Cabinet ......................39 Page 2 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
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. We recommend that this instrument to be re-calibrated annually. -
Page 4: 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 5: Cautionary Note
CAUTIONARY NOTE ISOTECH PRODUCTS ARE INTENDED FOR USE BY TECHNICALLY TRAINED AND COMPETENT PERSONNEL FAMILIAR WITH GOOD MEASUREMENT PRACTICES. IT IS EXPECTED THAT PERSONNEL USING THIS EQUIPMENT WILL BE COMPETENT IN THE MANAGEMENT OF APPARATUS WHICH MAY BE POWERED OR UNDER EXTREMES OF TEMPERATURE. THEY MUST BE ABLE TO APPRECIATE THE HAZARDS WHICH MAY BE ASSOCIATED WITH AND THE PRECAUTIONS TO BE TAKEN WITH, SUCH EQUIPMENT. -
Page 6: Health And Safety Instructions
Do not use the apparatus outside its recommended temperature range. 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: Introduction
INTRODUCTION The 875 fluidised-powder calibration furnace has been developed to meet the need for a single medium to cover the range 50°C to 700°C with good stability and uniformity. It represents a major step forward in temperature calibration technology. Fluidised furnaces normally consist of a container of aluminium oxide powder with a porous base-plate. Sufficient air is passed through the plate to motivate the powder bed into a fluid-like state which means that it will flow, display buoyancy effects and transfer heat well. -
Page 8: Major Features
The furnace's independence from peripheral equipment and its clean operation enable it to be easily moved on its castors for use in alternative locations. The furnace design is based on long experience of calibration. Page 8 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 9: Specification
Furnace Container: Stainless Steel Working Volume: 67mm diameter, 457mm deep Temperature Range: 50°C to 700°C Heaters: 3 x 1kW wired in parallel. Heated length of each is 2135mm Page 9 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 10: Theory Of Operation
The degree of fluidisation and the flow pattern throughout the fluidised medium have been more strictly controlled than in conventional fluidised baths. In the 875 system, the fluidisation is graded across the furnace to promote efficient heat transfer, mixing around the heaters and temperature stability at the work pieces. -
Page 11: Unpacking And Initial Inspection
If you find any damage, or that part of the delivery is missing, immediately notify Isotech (or our agent) and the carrier. Keep the packaging, if damaged, for possible inspection by an insurance assessor. -
Page 12: Assembly
Gasket and spares. Handbook. To transport the 875 Fluidised Bath, it is necessary to remove from the bath the assembled air filter in its outer cover and to disconnect the controller. Therefore, on arrival, you will need to reassemble these items as follows: Remove the bung from the furnace exhaust outlet on top of the bath. -
Page 13: Using The Temperature Controller
ADVANCED CONTROLLER FEATURES Setpoint Ramp Rate By default the 875 Fluidised Bath it is configured to heat as quickly as possible. There may be some calibration applications where it is advantageous to limit the heating (leave rate). An example might be when testing bimetallic thermostats; by forcing them to heat at a controlled rate it is easier to determine the temperature at which the thermostat changes state. -
Page 14: Instrument Address
A row of beacons indicate the controllers status as follows, Heat Output This beacon indicates activity on the PC interface Units Momentary pressing the Scroll key will show the controller units °C or °F. Page 14 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 15: Diagnostic Alarms
Error 5: Input circuit failure Err5 Consult Isotech Power failure Pwr.F . The line voltage is too low Check that the supply to the controller is within the rated limits Page 15 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 16: Initial Running
Switch on the power to the furnace and to the controller and check that the "LOW AIR SUPPLY" warning light (Fig. 6 - Front & Rear Elevation - drawing 875-20-02) is on. Switch on the controller. The display should indicate the bath temperature (the heater light on the furnace should remain off, regardless of the controller setting, until the correct air pressure is applied). -
Page 17: Optimisation Of The Bath's Performance
The bath can be used to calibrate thermometers both by comparison and by fixed point methods. The standard single carrier tube (64mm diameter x 475mm deep) (Fig. 5 - Standard Calibration Tube - drawing 875-02-11) insert can be used for both these methods. Also available is a 9-pocket insert, primarily intended for the comparison calibration of thermocouples. -
Page 18: Maintenance
FROM THE OPEN FURNACE. NB: Performance of the bath is critically dependent on the physical attributes of the alumina powder. To meet the correct specification, please purchase replacement powder from Isotech. Cool Down To facilitate the cooling of the bath, leave the fluidisation system running after switching off the heaters. -
Page 19: Air Flow Settings
Adjustment can be effected by altering the pressure. Care should be taken, because over- fluidising the bath can affect maintenance times of the filter. Page 19 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 20: Safety Features
The fuse is there for your protection and the initial fault that should cause the fuse to blow must be repaired before powering the furnace up again. If in doubt contact Isotech or your nearest distributor. Page 20 of 39... -
Page 21: Accuracy Of Measurement, Fixed Point Method
"The ability of a measurand to maintain constant its metrological characteristics". The 875 Fluidised Bath can be used (to realise part of ITS-90) with a single re-entrant closed ended tube to house freeze point cells of Indium, Tin, Zinc or Aluminium (Fig. 5). Using these cells, stabilities of 0.1 to 2mK can be expected during the first 50% of a freeze. -
Page 22: Using The Pc Interface
The Isotech conversion leads are suitable for maximum combined lead lengths of 10M that is adequate for most applications. Connections For RS232 use simply connect the Isotech cable, a 9 to 25 pin converter is included to suit PCs with a 25 pin serial converter. RS422 Connections... -
Page 23: Cal Notepad
DEVELOPMENT Cal NotePad was developed by Isothermal Technology using LabVIEW from National Instruments. The license details are shown on the download page and in the Cal Notepad manual. Page 23 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 24: How To Install Cal Notepad
Should you ever need to uninstall the software then use the Add/Remove Programs option from the Control Panel. PROTOCOL The instruments use the "Modbus Protocol" If required, e.g. for writing custom software the technical details are available from our Document Library at http://www.isotech.co.uk Page 24 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 25: Comparison Calibration
"An estimate characterizing the range of values within which the true value of a measurand lies". The 875 Fluidised Bath, when used as a comparison bath with our most recent design of equalizing block will accommodate an SPRT in the centre. If the SPRT has a Class 1 Calibration, uncertainties of between 0.02°C and 0.05°C are possible over the temperature range 100°C to 700°C. -
Page 26: Realising The Following Fixed Points: Indium, Lead, Zinc, And Aluminium
Th , etc. At the temperatures of Indium, Lead and Zinc it is generally permissible to withdraw a thermometer, of type Isotech 909, directly into room temperature. At the Aluminium Point, the thermometer must be cooled slowly to 450°C. -
Page 27: Freezing The Tin Cell
Once familiar with the procedure using coarse settings, on subsequent exercises bring the setting of the controller closer to the known freeze temperature to increase the plateau length. Page 27 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 28: Typical Melt/Freeze Sequence
Furnace-controlled temperature Temperature drop caused by furnace controller adjustment Depth of supercool (particularly pronounced for tin) Plateau showing constant temperature during freeze Temperature drop after completion of freeze Page 28 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 29: Cell Handling
CELL HANDLING In order to facilitate introduction to, and removal from, the furnace, Isotech provides, 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 30: Cell Basket (Short) General Assembly
Cell Basket (Short) General Assembly Page 30 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 31: Type B Optimal Cell Basket General Assembly
Type B Optimal Cell Basket General Assembly Page 31 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 32: Type C Optimal Cell Basket General Assembly
Type C Optimal Cell Basket General Assembly Page 32 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 33: Fault Finding
Presence and integrity of filter. (ii) Integrity of gasket and mating of filter unit flanges. (iii) Securing nut at end of filter assembly, especially when running at high temperatures. Page 33 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... - Page 34 Figure 1: Fluidised Bath Filter & Case General Arrangement Page 34 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13...
- Page 35 Figure 2: Fluidised Bath Air System Page 35 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13...
- Page 36 Figure 3: Fluidised Bath Equalising Block Handbook Assembly Page 36 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13...
- Page 37 Figure 4: Test of Equalising Block Assembly Page 37 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13...
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Page 38: Calibration Tube
Calibration Tube Page 38 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13... -
Page 39: Front & Rear Elevation Of 875 Fluidised Bath Cabinet
Front & Rear Elevation of 875 Fluidised Bath Cabinet Page 39 of 39 Fluidized Calibration Bath Model 875 Iss.06 – 09/13...
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