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Parallel Tube Liquid Bath model Libra 785 Iss. 03 - 11/16 

 

 

 

 

 

 

 

PARALLEL TUBE LIQUID 

BATH MODEL 

LIBRA 785 

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: [email protected] 

 

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 

Summary of Contents for LIBRA 785

Page 1: ...9 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 2: ...ANEL LAYOUT 13 The Temperature Controller 13 Altering the Setpoint 13 Instrument Address 13 Monitoring the Controller Status 13 Additional adjustments 14 OVER TEMPERATURE CONTROLLER H MODEL ONLY 14 OVER AND UNDER TEMPERATURE CONTROLLER M MODEL ONLY 14 OVER TEMPERATURE CONDITION 15 FLOW CONTROL 16 OPERATION AND INITIAL TESTING 17 LIQUIDS 18 CHOICE OF LIQUIDS 18 LIQUID LEVEL 18 CHANGING LIQUIDS 18 T...

Page 3: ...RAMIC 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 ISOTHERMAL TECHNOLOGY LTD PINE GROVE SOUTHPORT PR9 9AG ENGLAND TEL 44 0 1704 543830 544611 ...

Page 4: ...ED AND COMPETENT PERSONNEL FAMILIAR WITH GOOD MEASUREMENT PRACTICES IT IS EXPECTED THAT PERSONNEL USING THIS EQUIPMENT WILL BE COMPETENT WITH THE MANAGEMENT OF APPARATUS WHICH MAY BE POWERED OR UNDER EXTREMES OF TEMPERATURE AND ARE ABLE TO APPRECIATE THE HAZARDS WHICH MAY BE ASSOCIATED WITH AND THE PRECAUTIONS TO BE TAKEN WITH SUCH EQUIPMENT ...

Page 5: ...ok 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 can not 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...

Page 6: ... 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 The...

Page 7: ...Assembly 2 One overflow and one drain pipe 3 This User Maintenance Manual Handbook 4 PC Comms Lead Optional accessories are available and will on be present if specified on your order In the unlikely event of any items arriving damaged please retain the packing materials which may need to be inspected later and then contact your supplier ...

Page 8: ... Due to the complexity of world power supplies and installation connectors your bath has no connector fitted Please fit a suitable connector for you local supplier s outlet Take care to ensure the old plug is disposed safely The cable is colour coded as follows COLOUR FUNCTION Green yellow Earth Ground Brown Live line Blue Neutral Please ensure that your unit is correctly connected to the electric...

Page 9: ...l by pass valve that will reduce the running pressure of the refrigeration system The by pass valve will automatically enable at temperatures above 10 C until the chiller is automatically switched off at 40 C Because of the time taken to cool down from higher temperatures with the by pass enabled and reduced cooling the by pass valve only actually opens when the actual temperature is within 3 C of...

Page 10: ...y read before using the bath and then set the bath up as follows Connect the drain pipe to the drain tap and the overflow pipe to the rear overflow pipe Place a suitable container under the overflow pipe Ensure the tap is shut i e lever at 90 to the tap body If the equalising block is to be used it should be placed in position now Fill the bath with suitable liquid water is probably best for initi...

Page 11: ...Page 11 of 24 Parallel Tube Liquid Bath model Libra 785 Iss 03 11 16 FIGURE 1 FRONT PANEL CONTROLS ...

Page 12: ...Page 12 of 24 Parallel Tube Liquid Bath model Libra 785 Iss 03 11 16 FIGURE 2 REAR PANEL LAYOUT ...

Page 13: ...point Instrument Address The controller has a fixed ADDRESS set at Address 1 The Overtemperature controller is configurable but set to 2 as factory default Monitoring the Controller Status 1 This is the actual liquid temperature in the bath 2 This is the bath setpoint in C configurable by using the up down buttons 3 This shows the heater output as a percentage this is non adjustable and is set by ...

Page 14: ...higher perhaps 10 20 C higher than the working temperature or to the maximum safe temperature of the fluid in use Which ever is the lowest value IT MUST BE SET IN THIS WAY TO ENSURE SAFE USE OF THE BATH Suitably set it will allow for protection against component failure and also operator error when setting the controller either from the front panel or remotely from a computer The heat enabled beac...

Page 15: ...NDERTEMPERATURE CONDITION ATTENTION REQUIRED The respective illuminated beacon will also switch off To reset the heater or cooler the condition must be removed that is the temperature must be restored to the correct value by either waiting for the temperature to normalise or by resetting the controller to a more suitable value The controller will need to be reset manually even if the controller is...

Page 16: ...adjustment It should initially be set to the mid position and then adjusted whilst the flow is observed The optimum position for a particular liquid at a specific temperature may need to be determined experimentally As a general guide the flow should be increased until it becomes turbulent and then backed off slightly Generally the stability will be optimum when the flow is high but stable ...

Page 17: ...g liquid Connect the bath to the supply and switch on 1 Set the over temperature controller to a suitable value see earlier 2 Set the set point of the temperature controller to the desired value 3 Adjust the flow if necessary 4 The bath should now reach and control at the target set point The bath may now be used for calibration see tutorial For temperatures above 40 C the refrigeration if fitted ...

Page 18: ...sed alumina bath the 875 Bath which overcomes the limitations of oils and may be used to 700 C without fuming problems Below ambient we use a mixture of methanol and water Methanol is poisonous and has a low flash point It needs to be used very carefully by those suitably trained and aware of the dangers if handled inappropriately As local safety requirements vary not only from country to country ...

Page 19: ...a clean container of adequate capacity properly labelled for future use 4 Clean the bath Detergent and absorbent paper will assist If the bath has been used with oil it can be helpful to re fill with water and detergent and to allow the mixture to circulate before draining again 5 Close the tap ...

Page 20: ...ver temperature controller setting and enable Liquids flows unevenly Check Flow Setting If no improvement the liquid may not be suitable for us at this temperature Bath Overflows Check Overflow is not blocked and liquid level Remember oil expands as it heats N B If the oil suddenly expands and overflows at 100 C it may have been contaminated with water and the oil should be replaced after this has...

Page 21: ...ation and then linked to a single RS232 see diagram Note The RS 422 standard specifies a maximum lead length of 1200M 4000ft A true RS422 port will be required to realise such lead lengths 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 inc...

Page 22: ...onal temperature indicator such as the milliK or TTI 10 The software requires Windows 9X XP a minimum of 5Mb of free hard drive space and free serial ports for the instruments to be connected 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: ... the prompts which will install the application a user manual with setup information and the necessary LabVIEW run time support files 5 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...

Page 24: ...ld up to 12 liquid in glass thermometers maximum diameter 12 7mm radially and a centre mounted standard sensor The assembly may be rotated allowing systematic calibration The assembly is designed for partial or full immersion of thermometers 915 03 Monocular and Support Useful for viewing and magnifying the liquid column within the thermometer being calibrated This ancillary piece of equipment is ...

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