WALZ Photosynthesis Instruments
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Field of use
  • Laboratory
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  • Water
Metrics
  • Photosynthetic Light Reactions
  • Gas Exchange
  • Light Measurement
Application
  • Corals
  • Algae
  • Surfaces
  • Leaves, Fruits & Branches
  • Lichen & Mosses
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KF-18/2B & KF-24/6B

Version

Cold Traps for 6 or 25 l/min Gas Streams

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  • Specifications
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Cold Trap for 6 l/min - KF-18/2B

Cold Traps: Humidity Control in Gas Streams
Cold Traps: Humidity Control in Gas Streams

Cold traps control the humidity in a gas stream. For this purpose, the gas stream is directed through the cold trap and cooled down to the set temperature. If the dewpoint of the inflowing gas is above the set temperature value, the excessive water vapor condenses and the outstreaming gas has a defined dewpoint, corresponding to the set temperature value. If required, the gas may be humidified prior to streaming into the cold trap.

The cooling inside the cold trap is performed with Peltier coolers regulated by a temperature controller. The condensate accumulates in a hose and may be let off from time to time.

Temperature Controller TR-KF-6.
Temperature Controller TR-KF-6 (maximum gas flow 6 l/min)
Cold Trap KF-24/6B.
Cold Trap KF-24/6B (maximum gas flow 25 l/min)
Temperature Controller TR-KF-24.
Temperature Controller TR-KF-24 (maximum gas flow 25 l/min)
Temperature dependence of vapor pressure above water.
Temperature dependence of vapor pressure above water.

Cold traps may be integrated into existing pneumatic structures. They are appropriate for a wide range of applications, such as:

  • Calibration of humidity sensors (e.g. capacitive humidity measuring cells and dew point mirror measuring systems)
  • Calibration of infrared H2O gas analyzers
  • Generation of gas with defined humidity conditions for the inflowing gas of gas-exchange chambers
  • Usage as part of bypass humidity control units, in order to avoid a rise in humidity as a result of transpiration, in large gas-exchange measuring chambers
Cold Trap KF-18/2B during humidity calibration of the GFS-3000.
Cold Trap KF-18/2B during humidity calibration of the GFS-3000.

KF-18/2B & KF-24/6B (Cold Trap for 6 l/min - KF-18/2B)

One gas path
Maximal flow rate

6 l/min.

Temperature Range

-50 to +70 °C dewp.

Accuracy

±0.1 °C dewp.

Cooling

Peltier cooler

Max. temperature difference to environment

35 K

Temperature sensor

Pt100

Hose connections

Hose fittings for 6/8 mm dia. tubing

Operating temperature

-20 to +50 °C

Dimensions

12 x 27 x 22 cm (W x H x D)

Weight

3.5 kg

Required temperature controller

TR-KF-18

Internal Software TR-KF-6 and TR-KF-24

The Temperature Controllers TR-KF-6 and TR-KF-24 are operated with the software TR-KF provided for Windows PCs. The set temperature, actual temperature and status are indicated. Freely adjustable charts show the time course of set-value and temperature.

Two modes of temperature control are available:

  • Control to a set temperature
  • Control to an external signal

There is a choice, how the instrument shall resume operation after a power interruption. User requests can be integrated into the software.

Software of Temperature Controllers TR-KF-6 and TR-KF-24: Main Window.
Software of Temperature Controllers TR-KF-6 and TR-KF-24: Settings Window.
Software of Temperature Controllers TR-KF-6 and TR-KF-24: Main Window.
Software of Temperature Controllers TR-KF-6 and TR-KF-24: Settings Window.

Usage

Laboratory
Gas Exchange
Lichen & Mosses
Leaves, Fruits & Branches
Surfaces

Highlights

  • Exact control of gas humidity
  • Efficient Peltier cooling
  • Calibration of humidity sensors

Downloads

  • Software: TR_KF Software
  • Manuals & Documentation: Coldtrap Manual
Go to downloads
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