HMK15 Humidity Calibrator Features • Easy and reliable calibration of humidity probes and transmitters • Based on saturated salt solutions • Fast temperature equilibration • No external power required • Suitable for laboratory use and on-site checks • Chambers and transit covers make HMK15 easy to transport • Pre-measured certified salts available • Vaisala Service Centers offer accredited calibrations for humidity, temperature, and barometric pressure No measuring instrument stays accurate by itself. It is essential that the functioning of an instrument is periodically checked against a reference. Vaisala has developed Vaisala Humidity Calibrator HMK15 to make calibration and spot-checking of humidity probes and transmitters easy and reliable. Benefits • Easy to use • Reliable calibration • Certified and pre-measured salts available on order form of HMK15 calibrate humidity instruments. Usually two or three different salt solutions are used. Salts are chosen according to the application. Available salts and their reference humidities: • Lithium chloride LiCl (11 %RH) • Magnesium chloride MgCl2 (33 %RH) Reliable calibration method • Sodium chloride NaCl (75 %RH) The operating principle of HMK15 is based on the fact that a saturated salt solution generates a certain relative humidity in the air above it. The reading of the humidity probe or transmitter can then be adjusted accordingly. Many calibration laboratories use this generally accepted and reliable method to • Potassium chloride KCl (85 %RH) • Potassium sulphate K2SO4 (97 %RH) Certified salts HMK15 can be ordered with certified and pre-measured salts. A sample calibration is made from each salt batch in Vaisala’s Measurement Standards Laboratory (MSL). FINAS accredited measurement standards laboratory Vaisala’s Measurement Standards Laboratory is a FINAS accredited calibration laboratory. FINAS is a member of the EA (the Europea

Technical data Operating environment Operating temperature range Spare parts and accessories +0 … +50 °C (+32 … +122 °F) 1 kg (2.20 lb) without salt solutions Material (metal parts) Anodized aluminum Thermometer with red capillary liquid Mechanical specifications Salt chambers and lids Two salt chambers with basic lids and transit covers Thermometer HMK15 salt chamber with basic lid and transit cover Base plate HMK15 custom lid for DMT132 and HMP60/HMP110 with filter on Standard contents of HMK15 calibrator HMK15 universal lid HMK15 custom lid for 4 × HMP110 with filter on HMK15 salt chamber...