Control Technology Constant Climate Chambers

Active humidification and dehumidification

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HPP Display

For material tests performed under constant climate conditions, it is above all the precisely adjustable temperature/humidity constellations, stable over long periods, that is of crucial significance. The HPP constant climate chambers are equipped with Perfect class controller. The combination of Peltier technology for heating, cooling and dehumidifying, as applied by Memmert in its new constant climate chambers, is so far unique on the market.

 

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Humidity diagram Memmert HPP (humidity range depending on temperature)

The active humidification and dehumidification system:

When humidifying, the humidity content is controlled via a hot steam generator. This evaporates specific doses of distilled water from an external supply tank and mixes the sterile hot steam with the air stream.
Dehumidification takes place through cold traps created with Peltier technology. This provides the HPP constant climate chamber with a working range of 10 - 90% relative humidity.


Peltier technology  for continuously adjustable heating and cooling down. A multifunctional, fuzzy-supported PID process controller, with permanent performance adjustments and integrated self-diagnosis system, ensures perfect and absolutely reliable temperature control and the highest process safety.

  • Temperature range 5 °C to 70 °C with a display and setting accuracy of 0.1 °C
  • Over and under temperature protection: An adjustable over/under temperature controller TWW protection class 3.3 takes over control in case of failure  at a preset temperature. ASF Automatic Safety Function - a unique safety function - for over- and undertemperature automatically following the setpoint in a freely selectable tolerance range. An alarm sound is activated in case of over- /undertemperature, and the heating function is switched off in case of overtemperature, cooling function is switched off in case of undertemperature.
  • 2 high-grade platinum temperature sensors Pt 100 in a 4-wire circuit (for stable long-term transmission of measurement signals) communicate with each other and ensure uninterrupted error-free temperature control at constant working temperature
  • Digital programme control (programmable to the minute) for temperature profiles consisting of up to 40 ramps
  • Weekly timer programmable to the minute
  • Simultaneous display of all parameters, such as  temperature, humidity, weekday, time, and number of ramps
  • Visual and acoustic alarm in case of over-/undertemperature over-/underhumidity and empty water tank 
  • Alphanumeric text display in different languages (D/UK/E/F/I)
  • Function signals for stand-by, operating mode, heating, cooling, humidification and malfunction over/undertemperature
  • Internal log memory with 1024kB to save temperature, humidity and error states, with timestamp to the minute
  • Chip card control including 1 MEMoryCard XL with 32 kB memory capacity (max. 40 ramps)
  • Serial USB-interface and software Celsius to read out the appliance's internal log memory
  • Parallel printer interface for printout of log data via an external PCL3-compatible inkjet printer