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For example: Your samples are always around 0.700aw. It is suffi cient if you
use the 58%rH und die 75.%rH SAL-T standards for calibration. If verifi ca-
tion is requested, calibrate at 58%rH and 84% rH and use the 75%rH SAL-T
standards for verifi cation.
8.1
How to Handle SAL-T Standards Correctly
The Novasina SAL-T standards are not labeled with a due date. The shelf-life
itself depends on the handling and storage conditions. Experiences in the fi eld
have proven that those standards can be good for 3-5 years if handled correctly.
To achieve the best possible shelf-life, please
• Shake all SAL-T standards twice a month for one minute, nevertheless if
you have used them or not. There is no need to take it out of the plastic
container.
• Always store the standards in the plastic container (closed cover) and not
exposed to direct sunlight.
• Do not expose the salt tablet to environmental air for longer than necessa-
ry; thus, put it back if calibration has been fi nished at the particular point.
Please always double-check, if the SAL-T standards below 33%rH contain no
or just few water and all the others are present as slurries (salt/water mixture).
Contact the local representative if you feel unsure, how to handle the SAL-T
standards correctly or feel uncertain if the existing ones are still in good shape.
8.2
Values of SAL-T Standards
8.3 Factory Calibration, Delivery Status
Every LabTouch-aw as well as every new replacement sensor "CM-2" is de-
livered with a factory calibration at 7 points: 0.11, 0.33, 0.58, 0.75, 0.84, 0.90
and 0.97, including a factory certifi cate. For verifi cation and possible calibration
there are 4 different SAL-T salt tablets included in the delivery but additional
ones can be bought if necessary.
Type of Novasina EU Toxic Color Chem. % relative humidity in relation Literature
Hum.check type classe of salt symbols of temperature (x / 100 in a
w
) Reference
15°C 20°C 25°C 30°C
SAL-T / 6 SC-6 Xn white LiBr 6.9 6.6 6.4 6.2 A
SAL-T / 11 SC-11 Xn white LiCl 11.3 11.3 11.3 11.3 A
SAL-T / 33 SC-33 -- blue MgCl
2
-6H
2
O 33.3 33.1 32.8 32.4 A
SAL-T / 53 SC-53 O green Mg
(NO
3
)
2
-6H
2
O 55.9 54.4 52.9 51.4 A
SAL-T / 58 SC-58 -- white NaBr 60.7 59.1 57.6 56.0 A
SAL-T / 75 SC-75 -- purple NaCl 75.6 75.5 75.3 75.1 A/B
SAL-T / 84 SC-84 -- white KCl 85.9 85.1 84.3 83.6 A
SAL-T / 90 SC-90 T white Ba
(Cl)
2
-2H
2
O 90.9 90.5 90.1 89.9 C
SAL-T / 97 SC-97 -- yellow K
2
SO
4
(>20%) 97.9 97.6 97.3 97.0 A
Lit : A : Greenspan, Humidity Fixed points of Binary Saturated Aequeous Solutions
Journal of Research of the National Bureau of Standards Vol. 81A, No1 01/02 1977
B : Robinson R.A. and Stokes R.H. Electrolyte Solutions, Butterworths London 1959
C : Wexler, Humidity and Moisture Vol.3, Fundamentals and Standards, Robert E.Krieger,
Publishing Company Huntingon, New York
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