Atmos Wiki

• Description: Calibration set up for Vaisala Humidity Sensors
• Manufacturer: Vaisala
• Manufacturer Spec Site: Vaisala HMK15 Humidity Calibrator
• Model: HMK15
• Manual: HMK15 User Guide

• Main Board
  • Salt Solution Chambers (x2)
  • Sensor Cap Attachment (x2)
  • Sensor Cap Plugs (x10)
  • Thermometer
• Measuring Cup
  • 
• Plastic Probe/Stirring Stick
  • 
• Adapter Rings (x3)
  • 
• Salts
  • 
  • NaCl (75% RH)
  • K2SO4 (97% RH)
• Calibration/Preparation Date Tags
  • 
• Certificate of Calibration/Inspection
  • 

Need:

• HMK15 Humidity Calibrator
• Vaisala Humidity Sensor
• Deionized water

Steps:

1. Prepare salt solutions
   1. gg
   2. Depending on the frequency of use and the general operating conditions, the salt solutions maintain their characteristics for 6 - 12 months, after which they must be replaced. Perform a visual check every 2 - 3 months. There must be a minimum of 10 % of undissolved salt at the bottom of the chamber (max. 90 %). The salt must be clean, otherwise it must be reprepared.
2. Wait 24 hours
3. Calibrate Instrument