Vaisala HMK15 Guide de l'utilisateur télécharger pdf (Page 14)

User's Guide ________________________________________________________

12 _____________________________________________________M210185EN-C

- At the bottom of the salt chamber there must not be more

than 1 cm of undissolved salt and liquid. Otherwise, the

sensor to be calibrated can be immersed into the solution.

If necessary, verify the amount for example with the

measurement spoon.

- Various standards (ASTM E104-85, DIN 50008, JIS

Z8806) include recommendations and instructions on

how to prepare and store salt solutions.

Preparing the Solutions

Lithium chloride generates a reference humidity of

approximately 11 %RH. It is normally used as the dry end

(offset) reference.

NOTE

Never add water to dry LiCl salt; the salt may heat up so

rapidly that it splashes out of the chamber.

NOTE

LiCl is harmful when swallowed; the solution is also

corrosive.

NOTE

If the LiCl solution is used or stored in temperatures below

+18°C, its equilibrium humidity changes permanently.

Magnesium chloride generates a reference humidity of

approximately 33 %RH. It is often used as a check point if

calibration is performed at more than two points.

Sodium chloride generates a reference humidity of

approximately 75 %RH. It is used as the wet end reference

(gain) for probes measuring in applications with normal

humidities.

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Vaisala HMK15 Guide de l'utilisateur Page 14