Thermocirculator and Recirculating Heater / Chillers
The EMS 3500 Thermocirculator is a low cost, portable water circulating system for supplying a constant temperature supply for closed and open loop applications at near ambient to +60°C.
- Precise control of heating
- Robust and reliable
- No running water to waste
- Ideal for use with the EMS 3000 and EMS 3100 Critical Point Dryers
The EMS 3500 is suitable for open and closed loop applications and has all controls and liquid
connections on the front panel. The temperature controller shows not only the ‘set’ temperature
(between ambient and +65°C), but also the actual liquid temperature. The fluid is circulated by a
glandless magnetic pump, through an aluminum reservoir.
A cooling coil is mounted in the liquid reservoir. This coil can be directly connected to the main water supply and is primarily used when temperature control near to ambient is required. The electronic control system features a zero voltage switching unit which minimizes mains electrical interference, enabling the EMS 3500 to be used and sited with other sensitive electronic instruments.
Using the EMS 3500 with critical point dryers
The EMS 3500 will give controlled heating of EMS 3000 and EMS 3100 Critical Point Dryers. It is connected directly to the inlet and outlet of the EMS 3000 or EMS 3100 water jacket. The temperature of the circulating fluid is pre-set, typically set to 37°C (eg just above the critical temperature of carbon dioxide).
Trichomes and stomatal pores on the epidermal surface of a barley (Hordeum vulgare) leaf. Some very fine wax crystallites are also just visible on the surface of the leaf.
|Stomatal Pore on Xerophyte Leaf
Surface Critical point dried epidermis of a xerophyte (cactus), demonstrating raised stomatal pores.
|Mature Spruce Wood
Critical point dried block of mature spruce wood block, demonstrating transverse, tangential and radial views of tracheids and vessels.
|Working temperature range||Ambient to +65°C|
|Reservoir capacity||2.2L / 3.5 Pints|
|Pump type||Glandless magnetic drive|
|Pump motor||Shaded pole|
|Pump flow||270L/h (zero head) / 60 Gal/hr (zero head)|
|Pump pressure||0.25kg/cm2 / 3.5psi|
|Max pump head (unrestricted)||2.5m / 7.5ft|
|Size (unpacked)||330 x 280 x 150mm / 13 x 11 x 6"|
|Weight||8kg / 17.6lbs|
Temperature range -20°C to +70°C -20°C to +70°C -20°C to +70°C -20°C to +70°C
|91095||EMS 3500 Thermocirculator||each||POR||Quote|
Recommended for open and closed loop applications, offering simplicity, reliability and quiet operation. The range includes the EMS 4860, 4870, 4880 and 4890.
- Precise temperature control
- Quiet, efficient operation
- Proven reliability
- Low maintenance
- Environmentally friendly - avoids running water to waste
Some typical applications
- Vacuum coating equipment
- Critical point dryers including the EMS 3000 and EMS 3100
- Electron microscopes
- Chromatography equipment
- Electrophoresis baths
- Environmental chambers
- Crystal growth apparatus
- Fermentation equipment
- Photographic baths
- X-ray equipment
- Polarimeters, refractometers
...and many others
Many instruments measuring physical properties depend on accurate control of temperature and in some processes optimum temperature is essential. With the EMS 4800 series, over-cooling (which affects efficiency) is prevented and the water temperature can be accurately controlled over the range -10 to +60°C.
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 controlled temperatures below ambient, the extraction deteriorates significantly and, as a guide, the compounded change is 4% per degree Celsius. In practice, the refrigerant gas pressure has to be adjusted to optimize the performance at any particular temperature. However, the EMS 4800 series incorporate automatic adjustment valves in the systems.
The EMS 4800 series are of the ‘closed loop’ type and therefore efficiencies are dramatically improved
compared with open bath models. They are simple to set up and to operate, and essentially maintenance free.
Choosing the correct heater/chiller
In order to optimize performance from a heater/chiller system, the correct specification must be selected for a particular application. To cool or heat any instrument or system it is important to obtain the following information from the manufacturer:
- Heat load to be dissipated to water, eg for an electron microscope: diffusion pump heater, lenses, etc
- Flow rate and size of tubing
- Minimum pressure
With this information, consult the Specifications below and select the appropriate heater/chiller. The basic heat load calculation formula is as follows:
Flow rate x weight of fluid x specific heat x D T = Heat Extraction.
Heat Extraction Rates (in Watts)
|- 20°C||- 10°C||0°C||+10°C||+ 20°C|
|Extraction rate at 20°C||400W||1.4kW||2.2kW||3kW|
|Temperature range||-20°C to +70°C||-20°C to +70°C||-20°C to +70°C||-20°C to +70°C|
|Max pump flow||450L/h
|Max pump pressure psi/bar||12/60psi
|Water connections||16mm hose or 1/8 BSP||16mm hose or 1/8 BSP||16mm hose or 1/8 BSP||16mm hose or 1/8 BSP|
|Temperature sensor||R.T. Probe||R.T. Probe||R.T. Probe||R.T. Probe|
- High pressure pump for EMS 4860 and EMS 4870 (standard in EMS 4880 and EMS 4890)
- Water failure alarm
- Over and under temperature cut out
NOTE: Larger capacity heater/chillers (6kW and 12kW) are available on request - please contact us for further information.
- Custom-made heater/chiller units
|E4860||1/5 HP Recirculating Heater/Chiller||each||POR||Quote|
|E4870||1/2 HP Recirculating Heater/Chiller||each||POR||Quote|
|E4880||3/4 HP Recirculating Heater/Chiller||each||POR||Quote|
|E4890||1 HP Recirculating Heater/Chiller||each||POR||Quote|