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HygroFlex
Probe Adjustment / Loop Validation
On-site probe adjustment
HygroPalm
 Several alternatives are available to calibrate the probes uses with the HygroFlex transmitters:

• For a quick on-site check of the probe and eventual adjustment (1-point), you may want to
  use the HygroPalm 2 or the HygroPalm 3 portable indicator.

• For scheduled maintenance, you may to want to rotate the probes (as opposed to the
  complete instrument) between the measurement site and the metrology lab. The
  HygroClip product line is designed to make this easy.
Validation of the signal loop

To validate the entire measuring loop: transmitter, wiring and central processing unit, the signals of the HygroFlex transmitter can be displayed locally with the HygroPalm 3 indicator.  If so desired, the HygroClip probe can be replaced with a certified probe simulator that generates known fixed humidity and temperature values.
Probe adjustment in the metrology lab (using a HygroLab indicator)
HW3 Software HW4 Software: software based probe calibration is both simple and precise: there are no hard-to-reach, hard-to-adjust potentiometers. HW4 offers a high level of flexibility in selecting the calibration reference, giving the user complete control over the calibration process. HW4 features the following calibration modes:
  • Humidity: 2, 3 or 4 points
  • Temperature: 2 points
  • 1-point adjustment function (offset) for both humidity and temperature

When adjusting humidity against a ROTRONIC humidity standard, HW4 automatically corrects the value of the standard to reflect the temperature of calibration (see note). HW4 also offers the possibility of saving and printing a probe adjustment protocol.
  ROTRONIC HygroGen: this humidity-temperature generator is primarily designed for the calibration of humidity instrumentation. It is completely self-contained, requiring no external resources except mains power, and is light enough to be portable for use on-site.

  • Suitable for all types of humidity-temperature probes

  • Fast equilibrium to move from one condition to another

  • Generates an extremely stable humidity and temperature environment

  • Smart chamber design minimizes temperature and humidity gradients

  • Range: 5 to 50°C and 5 to 95 %RH

  • Chamber accepts up to five probes

  • Data loggers can be inserted in the chamber

  • Available with different models of chamber door

  • Stainless steel enclosure

      ROTRONIC HygroGen
 

Calibration standards 
Certified Humidity Standards: if you do not have access to a humidity generator, the ROTRONIC humidity standards offer a reliable and convenient way to generate a reference humidity condition during probe calibration. The ROTRONIC standards are shipped with an internationally accepted certificate, meeting in full the requirements of quality systems such as ISO 9000. The standards are available in boxes of 5 glass ampoules of the same value, and can be stored indefinitely. Standards in the range of 5 to 95 %RH are non-saturated aqueous salt solutions. The 0 %RH humidity standard is made of small granules of a highly porous ceramic. A Material Safety Data Sheet is available for each standard.

Note: the value of the standards does not depend on barometric pressure (altitude)

Calibration devices 
Calibration Devices: a calibration device is a small airtight container that fits on the probe and seals around the humidity sensor. During calibration, a known reference humidity is produced inside the calibration device by means of a humidity standard.

Four calibration devices are available for the HygroClip probes:
ER-15 for 15mm diameter probes
ER-05 for 5mm diameter probes
EM-15 for type ‘IE’ probes
ERV-15 for 15mm diameter probes (wall mounting)