AquaLab 4TE Series User Manual

AquaLab 15 APPENDIX A
Table 4: Water Activity of Selected Salt Solutions
Saturated Solution a
w
at 20
◦
C a
w
at 25
◦
C
Lithium Chloride 0.113 ±0.003 0.113 ±0.003
Magnesium Chloride 0.331 ±0.002 0.328 ±0.002
Potassium Carbonate 0.432 ±0.003 0.432 ±0.004
Magnesium Nitrate 0.544 ±0.002 0.529 ±0.002
Sodium Chloride 0.755 ±0.001 0.753 ±0.001
Potassium Chloride 0.851 ±0.003 0.843 ±0.003
Potassium Sulfate 0.976 ±0.005 0.973 ±0.005
Note: Table 4 adapted from Greenspan (1977). Rounded to
nearest thousandth.
4. Saturated salt solutions are very temperature-sensitive and their
values are not as accurate as the verification standards offered
by Decagon.
101

AquaLab 4TE Series Specifications

General

Accuracy	±0.003 aw
Temperature Control	15 to 50 °C
Measurement Time	5 minutes
Measurement Principle	Chilled Mirror Dewpoint
Resolution	0.0001 aw
Temperature Accuracy	±0.1 °C
Communication	USB, RS-232
Display	LCD
Measurement Range	0.03 to 1.00 aw
Operating Temperature	4-50 °C (39-122 °F)
Data Storage	8000 readings
Power Supply	50/60 Hz
Storage Temperature	-20 to 50 °C