Homeothermic Blanket System User`s Manual
Contents
1. connected the display will show a high reading of approximately 44 Centigrade This ensures that should a probe fault occur the unit will stop heating Adjusting the Set Temperature Once the Probe and Blanket have been connected to the control unit the system is ready for use The system is factory set to stabilise at 37 Centigrade To change the stabilisation point first insert the probe into a fold in the blanket Switch the system on and allow sufficient time for the blanket to warm up Adjust the front panel mounted TEMP SET control see page 6 item 5 using a small flat bladed screwdriver care should exercised when making this adjustment not to apply excessive force as this may lead to serious damage of the control until the desired temperature is achieved clockwise rotation of this control increases the temperature stabilisation point Allow 10 to 15 minutes after making this adjustment for the system to stabilise at the new setting and re adjust if necessary As this is a heating system only it is pointless to set the temperature below ambient temperature The temperature display is accurate only at temperatures between 35 and 40 Centigrade Analogue Output A BNC socket is provided on the front panel of the control unit see page 6 item 4 allowing the user to monitor the temperature between 35 and 40 Centigrade using a recording device such as the Harvard TR2 Chart Recorder The output from2. following BROWN wire LIVE terminal of your plug BLUE wire NEUTRAL terminal of your plug GREEN YELLOW EARTH terminal of your plug Before operating the HARVARD Homeothermic Blanket System ensure that the mains supply voltage is correct The system is factory set to 110 Volts or 230 Volts 50 60Hz as required there is a voltage ID label on the rear panel see page 7 item 5 The rear panel mounted mains inlet socket also incorporates the mains fuse and a single spare fuse Fuses should only be replaced with those of an identical type 1 Amp Quick Blow 20mm Anti Surge When replacing the mains fuse always ensure the equipment is disconnected from the mains supply This unit is intended for animal use only Neither we nor our agents can be held responsible should this notice be disregarded Introduction Front Panel Layout Homeothermic Blanket Control Unit HEAT INPUT BLANKET EARTH Power On Indicator 5 Temperature Set Control LCD Temperature Display 6 Blanket Output Socket Heat Input Display 7 Earth Switch Analogue BNC Output Socket 8 Probe Input Socket ROO N Introduction Rear Panel Layout O Heatsink 4 2 Mains Inlet Socket 5 3 Mains Switch Fuse Holder Voltage ID Label Connect the control unit rear panel mounted mains inlet socket see page 7 item 2 to the appropriate mains supply and switch on using the rear panel mounted mains switch see page 7 item 3 The Green PO
3. Cat 450mm x 700mm Dog 600mm x 900mm Viscose Nylon the blanket is supplied with a removable plastic cover 5 Pin Din plug 3mm Flexible PTFE 1 6mm Rigid Stainless Steel 1371 Ohms 2 Pin Din plug Harvard Apparatus Ltd FIRCROFT WAY EDEN BRIDGE KENT TN 8 6HE ENGLAND Tel 01732 864001 Fax 01732 863356 E Mail harvard twins co uk
4. Homeothermic Blanket System Instruction Manual HARVARD APPARATUS Models Covered by this manual Systems with Flexible Probes 50 7053 F Harvard Homeothermic Blanket System Small 115V 60Hz 50 7061 F Harvard Homeothermic Blanket System Small 230V 50Hz 50 7079 F Harvard Homeothermic Blanket System Medium 115V 60Hz 50 7087 F Harvard Homeothermic Blanket System Medium 230V 50Hz 50 7095 F Harvard Homeothermic Blanket System Large 115V 60Hz 50 7103 F Harvard Homeothermic Blanket System Large 230V 50Hz Systems with Rigid Probes 50 7053 Harvard Homeothermic Blanket System Small 115V 60Hz 50 7061 Harvard Homeothermic Blanket System Small 230V 50Hz 50 7079 Harvard Homeothermic Blanket System Medium 115V 60Hz 50 7087 Harvard Homeothermic Blanket System Medium 230V 50Hz 50 7095 Harvard Homeothermic Blanket System Large 115V 60Hz 50 7103 Harvard Homeothermic Blanket System Large 230V 50Hz Control Units 50 7129 Harvard Homeothermic Blanket Control Unit Only 115V 60Hz 50 7137 Harvard Homeothermic Blanket Control Unit Only 230V 50Hz HARVARD APPARATUS Introduction Homeothermic Blanket System Instruction Data Description Page Introduction General Description 4 Precautions 5 Front Panel Layout 6 Rear Panel Layout 7 Switching On 8 Operation Connection and Use of the Blanket 9 Connection and Use of the Probe 9 Adjusting the Set Temperature 10 Analogue Output 11 Blanket earthing 11 Service Adjustment of the Temperat
5. WER indicator see page 6 item 1 will illuminate The LCD TEMPERATURE display see page 6 item 2 will also indicate the current probe temperature if a probe is connected If a probe is not connected the display should show approximately 44 Centigrade The HEAT INPUT indicator array see page 6 item 3 may also be illuminated if the current temperature is less than about 38 Centigrade Connection and use of the Blanket Connect the blanket to the control unit using the front panel mounted BLANKET SOCKET see page 6 item 6 Do NOT remove the blanket from its protective cover Since the ability of the system to control the temperature of the animal depends on how intimately the animal is in contact with the blanket the animal should be wrapped closely in the blanket using tapes if necessary to keep the blanket in place It is advisable to use the blanket from the start of the operation or experimental procedure so that the animals temperature stabilises Where possible preheat the blanket by switching the system on half an hour before use is required with the temperature probe folded inside the blanket Connection and use of the Probe Connect the probe to the control unit using the front panel mounted PROBE SOCKET see page 6 item 8 The rectal probe is a small temperature sensing device when the probe is connected the control unit temperature display will indicate the current temperature of the probe If no probe is
6. em fails to heat the blanket and the heat input array does not illuminate it is likely that the fuse has blown Service Replacement of the Blanket Fuse The blanket fuse is located inside the unit and can be accessed by removing the top cover as described above Locate the fuse see diagram on page 14 and replace with one of an identical type 6 3 Amp 20mm Cleaning the Blankets As the blankets are enclosed in plastic covers the fabric of them should remain clean If it is necessary to clean a blanket it may be carefully washed by hand after which it must be thoroughly dried before use Internal Layout Blanket Fuse A Technical Specification Control Unit Blanket Power Ripple Output Warm Up Time Temperature Accuracy Temperature Stability Temperature Range Analogue Output Dimensions Weight Blanket Dimensions Material Connector Probe Types Impedance at 35 C Connector Maximum power input to the blanket is 40 Watts Power is supplied continuously not switched and is level is dependent on the temperature monitored by the probe Less than 10mV RMS 20 minutes 20 C to 37 C 1 of actual temperature 35 C to 40 C Better than 0 01 C C control unit output power with respect to control unit temperature 35 C to 40 C monitored on the front panel LCD 50 mV 35 C to 150mV 40 C 20mV C 274mm x 320mm x 94mm WxHxD 3Kgs approx Rat 150mm x 200mm
7. the BNC socket is a small electrical signal corresponding to the current temperature At 35 C the output will be 50mV and at 40 C the output will be 150mV This equates to 20mV C between 35 and 40 Blanket Earthing The blanket is electrically floating with respect to earth One end of the blanket heating element may be earthed by the front panel mounted EARTH switch see page 6 item 7 Adjustment of the Temperature Display Hazardous voltages are present inside this unit apparatus Any internal adjustments or servicing should be undertaken only by a competent person Ensuring the power supply to the unit is disconnected remove the top cover of the control unit This is achieved by removing the 4 large countersunk screws on the underside of the unit These screws are located in the 4 ribbed areas of the lower cover Switch the system on and place the probe into a beaker or bath of water at a controlled 37 Centigrade and wait for about 30 seconds Using a small flat bladed screwdriver adjust VR1 see the diagram on page 14 until the display reads 37 Place the probe into another beaker or bath of water this time at a controlled 40 Centigrade Adjust VR2 see the diagram on page 14 until the display reads 40 It may be necessary to repeat this process several times to obtain greater accuracy Replacement of the Blanket Fuse The blanket fuse protects the system should a faulty blanket be connected If the syst
8. ure Display 12 Replacement of the Blanket Fuse 12 Cleaning the Blanket 13 Internal Layout 14 Technical specification 15 Introduction General Description The HARVARD Homeothermic Blanket System is a closed loop temperature control and stabilisation system Utilising a small rectal probe to monitor temperature and a heating blanket to provide heat input subject temperatures can be accurately controlled The control unit varies the current flowing through the heating blanket in an inversely proportional manner to the temperature monitored by the temperature probe A regulated DC power supply is used to drive the heating blanket this provides a high degree of safety and minimum interference A large liquid crystal display on the control unit shows the probe temperature and a 10 segment LED bar array indicates the current heat input level A BNC socket on the front panel of the control unit provides the user with an analogue output to make external temperature monitoring possible using a chart recorder or similar instrument The blanket is enclosed in a protective plastic cover and may be folded without risk of internal damage as the internal heating element is made of highly flexible cable Introduction Precautions This Equipment has been designed for use with an earthed mains supply and should not be operated when not earthed Connect the power cable of the unit to a suitable three pin plug in accordance with the
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