Stirred Water - Thermometer Point
Contents
1. ETI hardware software No warranty of fitness for a particular purpose is offered and the user assumes the entire risk of using the product Any liability by ETI is limited only to the replacement of defective materials or workmanship and ETI accepts no responsibility for consequential loss In line with our policy of continuous development we reserve the right to amend our product specification without prior notice 7 SPECIFICATION range ambient to 100 C above 70 C use oil resolution 0 1 C accuracy 205 stability 205 heating time ambient to 60 C takes 30 minutes power 230 volt AC 115 volt available dimensions 180 x 260 x 315 mm weight 7500 grams XX CE supplied by Electronic Temperature Instruments Ltd Easting Close Worthing West Sussex BN14 8HQ tel 01903 202151 fax 01903 202445 e mail sales etiltd com www etiltd com 8 18 2 112. Stired Water calibration bath User Manual order code 822 900 CONTENTS introduction safety amp assembly operation set point temperature calibration detailed operation of the controller offset function integral function warranty specification CO NN Os 0s O0s Os Os Oo A INTRODUCTION The stirred water bath provides a simple and accurate method of checking the accuracy of thermometer sensors These units are ideal for use in a variety of industrial and process applications checking probes or temperature data loggers For further confidence in calibration each unit can be issued with a traceable Certificate of Calibration showing actual test data which can be used as part of a quality assurance programme For improved accuracy of calibration a Reference thermometer with a UKAS Certificate of Calibration can be used in conjunction with the bath For details of ETI Reference thermometers please contact the ETI Sales team on 01903 202151 or sales etiltd com SAFETY amp ASSEMBLY The Calibration Bath should only be operated by a person who has thoroughly read and understood this manual The Bath consists of three main parts base lid and heater unit When assembling the bath the heater unit must be placed to the left hand side The vents from the heater unit must be towards the outside The bath MUST contain sufficient water to cover the stirrer and heater coil by at least 30 mm Do not remove the heater uni
3. ifference of 0 1 C Small 0 5 changes will avoid any overshoot An alternative configuration to the above is proportional plus integral action this will avoid the need to keep manually correcting for any set point difference and will shorten the time taken to reach set point However there will be an overshoot in temperature INTEGRAL FUNCTION Press the left hand button three times and the display will indicate ti 1 adjustment of the up and down buttons will adjust the integral value Integral time is measured in seconds with range 0 1000 seconds Zero seconds means that the integral is off Note setting the integral will inhibit the offset function The shorter the integral time the faster the set point is achieved but the larger the overshoot At 70 C a 50 second integral time will give reasonable response time with a short settling time All settings are retained when the unit is turned off so once set further adjustment should not be required WARRANTY This instrument carries a twelve month warranty and guarantee against defects in either components or workmanship During this period products that prove to be defective will at the discretion of ETI be either repaired or replaced without charge The product warranty and guarantee does not cover damage caused by fair wear and tear abnormal storage conditions incorrect use accidental misuse abuse neglect misapplication or modification or use with non
4. set point adjust the offset using the left button See Detailed operation of the controller for more information CALIBRATION It is recommended that a Reference thermometer be used in conjunction with the bath to enhance the accuracy of the calibration procedure DETAILED OPERATION OF THE CONTROLLER SET POINT TEMPERATURE Pushing the centre up button or right down button as required sets the required temperature After the temperature has been set the display will return to indicate the temperature of the water in the bath As the thermal mass of the water bath is large it is preferable to minimise any overshoot in temperature as the time taken to return to the set point is dependent on the temperature of the bath and the ambient temperature To avoid temperature overshoot the unit is initially configured as a proportional only controller with a proportional band of 10 C In the steady state i e the water temperature has become stable the indicated temperature may be lower than the required set point In this case the offset function will need to be set to reduce the difference OFFSET FUNCTION Press the left hand button for five seconds and the display will indicate A2 dy press the left hand button again to display SHif Adjustment of the up or down buttons will now adjust the offset value 6 Offset is measured in with range 0 100 of the 10 C proportional band Therefore 1 will correct for a d
5. t from the bath with the power lead still connected to a power source A The heater coil can operate to a very high temperature Precautions MUST be taken to prevent personal injury or damage to surrounding objects The unit will remain hot for several minutes after switching off Allow to cool before storage This calibration bath is designed to be rugged and durable but does contain electronics that must be protected from splashing of water Connect input power lead to only a 230 volt 50 60 Hz grounded AC power supply Mains plug fuse rating to be 13 Amp A ETI calibration baths are programmed and calibrated at the factory for optimum performance and should not need adjusting The heater unit is equipped with a circuit breaker electrical fuse If the fuse blows allow the unit to cool before pressing the reset button If the fuse will not reset return to the supplier for inspection and repair Note there are no user serviceable parts inside OPERATION IMPORTANT Do not turn on the heater unit unless there is sufficient water in the bath i e at least 30 mm of cover to the heater and stirrer SET POINT TEMPERATURE To set the required temperature push the centre up button or right down button as required Atter the temperature has been set the display will return to indicate the temperature of the water in the bath Leave the bath for 20 minutes until the display has stabilised If the water temperature is not as the
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