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E4800 Series Circulating Heater/Chillers
Applications
-
Vacuum coating equipment (including Polaron E6300) - Critical point drying (including Polaron E3000 and E3100)
- Electron microscopes
- Chromatography equipment
- Electrophoresis baths
- Environmental chambers
- Crystal growth apparatus
- Fermentation equipment
- Interferometers
- Photographic baths
- X-ray equipment
- Polarimeters, refractometers
Environmental Considerations
Increasing pressures on natural resources has resulted in many countries restricting
the use of water run to waste for cooling of instrumentation. The E4800 series
of water recirculating heater / chillers are recommended for open and closed
loop applications, offering simplicity, reliability and quiet operation.
A 3-term digital temperature controller ensures ease of use and accuracy.
They can be used in locations where mains water is not available. Over-cooling,
which affects efficiency, is prevented.
Corrosion in closed systems can be minimised by adding inhibitors; with suitable
additives temperatures below zero can be maintained.
The water temperature can be accurately controlled over the range -10 to +60°C.
Many instruments measuring physical properties depend on accurate control of
temperature and in some processes optimum temperature is essential.
Control Temperature
A commonly misunderstood feature of refrigerated systems is in applications
where the control temperature is other than at or near room temperature.
When the instruments are to be operated at control temperatures below ambient,
the extraction deteriorates significantly and as a guide, the compounded change
is 4% per degree Celsius. In practise, the refrigerant gas pressure has to
be adjusted to optimise the performance at any particular temperature. However,
the Polaron E4800 range of instruments incorporate automatic adjustment valves
in the systems.
The Polaron range of recirculating heater/chillers are of the closed loop type
and therefore efficiencies are dramatically improved compared with open bath
models. They are simple to operate, and essentially maintenance free.
Choosing the Correct Chiller
In order to optimise performance from a Chiller/Heater system the
correct specification must be selected for a particular application.
To cool or heat any instruments or systems it is important to obtain
the following information from the manufacturer.
- Heat load to be dissipated to water, e.g. for an electron microscope: diffusion pump heater, lenses, etc
- Flow and size of tubing
- Minimum pressure
With this information consult the specification table below and select the appropriate Chiller/Heater. The basic heat load calculation formula is as follows:
Flow rate x Wt. of Fluid x Sp. Heat x D T = Heat Extraction
Heat Extraction Rates (in Watts)
- 20oC |
- 10oC |
0oC |
+10oC |
+ 20oC |
|
|---|---|---|---|---|---|
| E4860 | 75W | 105W | 180W | 300W | 420W |
| E4870 | 125W | 250W | 500W | 900W | 1.2KW |
| E4880 | 200W | 425W | 700W | 1.6KW | 2.2KW |
| E4890 | 350W | 600W | 1.2KW | 2KW | 3KW |
- 20oC |
- 10oC |
0oC |
+10oC |
+ 20oC |
|
|---|---|---|---|---|---|
| 4.5 KW recirculator | 700W | 1KW | 2KW | 3KW | 4.5KW |
| 6 KW recirculator | 800W | 1.3KW | 2.6KW | 4.5KW | 6KW |
Optional Attachments
High pressure pump for E4860 and E4870 (standard in E4880 and
E4890). Water failure alarm.
Over and under temperature cut out.
Note: Larger capacity heater/chillers (700W and 800W) are available on request. Please contact us for further information and pricing.
Bespoke Heater-Chiller circulator units
Bespoke systems are available and are built around our standard range of products, it is impossible to list all the possible applications but here is a selection of some of the 'specials' we have supplied recently.
- Stainless steel cased units for the food and drinks industry
- Specially adapted temperature controllers for use with customers' own computer - includes 0-10V, RS232 and RS485 communications
- Heater units to run with pressurised water up to 2500C and with oil up to 1500C
- Dual temperature control for heating and cooling switched via customers' computer
- In built stainless steel heat exchangers for the Petrochemical Industry
- Water cooled units for environmentally controlled areas
- Purged systems for use in chemically zoned areas
- Low temperature units for use on test rigs
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