Instruction Manual, November 2016 Page 37
3. Humidity control preparations
Before performing any of the procedures below (except for the
molecular sieve), first fill the humidity control tank (large cylindri-
cal glass tank) with 800 mL of water and mark the outside of the
bottle at the water line for future reference. Pour out the water so
that the bottle is empty dry.
1. Magnesium chloride Hexahydrate (rel humidity at 20°C =33%)
Add 900g MgCl2 hexahydrate into the humidity control tank. Add
200 mL distilled water and heat it up to 40-50 C° under stirring.
Add more distilled water in order to reach the 800 mL line that
was marked earlier. Cool down after 10 minutes to room temper-
ature. The final solution should contain about 1 cm of undissolved
salt on the bottom to ensure the saturation of the salt solution.
2. Potassium thiocyanate (rel humidity at 20°C =47%)
Add 1000g KSCN into the humidity control tank. Add 200 mL dis-
tilled water and heat it up to 40-50 C° under stirring. Add more
distilled water in order to reach the 800 mL line that was marked
earlier. Cool down after 10 minutes to room temperature. The fi-
nal solution should contain about 1 cm of undissolved salt on the
bottom to ensure the saturation of the salt solution.
3. Sodium chloride (rel humidity at 20°C =75%)
Add 360g NaCl into the humidity control tank. Add 500 mL dis-
tilled water and heat it up to 40-50 C° under stirring. Add more
distilled water in order to reach the 800 mL line that was marked
earlier. Cool down after 10 minutes to room temperature. The fi-
nal solution should contain about 1 cm of undissolved salt on the
bottom to ensure the saturation of the salt solution.
4. Preparation of molecular sieve
Open the gas wash bottle. Dismantle all filters and splash guard
plates and the distribution funnel. Add about 100g of the total of
500 g molecular sieve* into the gas wash bottle. Then mount the
distribution funnel, add the rest (about 400g) of molecular sieve
and mount finally the splash guard plates and the filters. Close the
gas wash bottle with the top cap.
*Molecular sieve dehydrate Fluka or Sigma with indicator for dry-
ing gases, beads diameter 2-5 mm
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