Introduction to HMK15 - HMK15

Vaisala Humidity Calibrator HMK15 has been developed for the calibration and checking of humidity probes and transmitters. The functioning of the calibrator is based on the fact that certain salt solutions generate a specific relative humidity in the air above them.

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Calibration certificate for salt package

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Ready-dosed salt package (accessory)

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Measurement cup

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Calibration adapter

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Salt chamber with transit cover on

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Thermometer

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HMK15 basic chamber lid with rubber plugs

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Base plate

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Ion-exchanged water (accessory)

The four holes in the HMK15 basic chamber lid are designed for Vaisala probes and transmitters with 12 mm (0.47 in) diameter. The fifth hole is for the thermometer delivered with HMK15.

The HMK15 universal lid is suitable for probe models with 12 mm (0.47 in), 13.5 mm (0.53 in), or 18.5 mm (0.73 in) diameter.

Optional custom lids are available for Vaisala DMT132 dew point transmitter and Vaisala HMP60 and HMP110 humidity and temperature probes ¹. For instructions on using HMK15 with DMT132 and HMP60/HMP110, see the respective user guides, available at docs.vaisala.com.

In calibration, the sensor head is inserted into a salt chamber containing a saturated salt solution. The reading given by the probe or transmitter is then adjusted to the humidity value that the specific salt solution generates at that particular temperature.

To ensure the sensor accuracy over the entire humidity range (0 … 100 %RH), calibration is usually performed at least at two different humidities.

HMK15 is suitable for both laboratory and field use. The chambers can be tightly closed for transportation with custom-designed transit covers. The optional transit bag (item code HM27032) allows the calibrator to be transported in vertical position or to be housed during calibration.

Accessories include additional salt chambers, ion exchanged water, transit bag, and ready-dosed salt packages: LiCl (11 %RH), MgCl₂ (33 %RH), NaCl (75 %RH), KCl (85 %RH), and K₂SO₄ (97 %RH).