Vaisala HMK15 - Manual (Page 13)

Chapter 3 _____________________________________Preparing the Salt Solutions
VAISALA _________________________________________________________ 11
CHAPTER 3
PREPARING THE SALT SOLUTIONS
General Instructions
- Prepare the salts using the equipment provided with the
calibrator or make sure that all accessories used are
suitable for preparing salt solutions and are absolutely
clean. If necessary, wash them carefully and rinse several
times before preparing the salt solutions. The last rinse
must be made with distilled or ion exchanged water.
- The salts are quick and easy to prepare with Vaisala's
ready-dosed salt packages. If you do not use ready-dosed
salt packages, measure the salts using the measurement
cup provided. Make sure that the cup is clean before
measuring the salts. In the following instructions, the
required amounts are given in grammes and millilitres.
The salt solutions must be prepared from salts of pro
analysis grade; these are available in agencies selling
industrial chemicals. Note that the water must be distilled
or ion exchanged (conductivity < 0.25 µS/cm). Ion
exchanged water can also be ordered as an accessory for
the HMK15 calibrator (order code 19767HM).
- Handle the salts and equipment carefully and keep them
absolutely clean so that the salts are not contaminated.
Make sure that the salts do not mix.