3.Calibration
The three Quantadats ,with matched Nsens probes ,are supplied calibrated with a traceable
certificate and no calibration checks should be necessary under normal circumstances, only if
readings are supect for some reason. A calibration kit ( SC humidity pots) is suplied only if this
is the case.
If calibration is needed:
Calibration may only be carried out as a check , no adjustment is possible with this kit.
Calibration may only be checked in RELATIVE HUMIDITY MODE so you need to set each
Quantadat to read Rh% ( see Step 3). Enter menu, select Measuring Point A and select
Relative Humidity. Rememebr to revert back to g/Kg ( mixing ratio) after any calibration
checks.
The Nsens priobes are supplied pre-calibrated and rady for use. All of the calibration
adjustment settings are stored inside the memory of each Nsens probe. However, it is
essential to have the means to check calibration with the SC calibration salts set at any teime
to ensure performance of teh system. The calibration tolerance to expect is + / - 2% relative
humdity and therfore the maximum difference you should see between all three probes should
be 4% relative humdity.
Using the
SC
(Sensor Check) calibration salts
Novasina calibration service
Storage and temperature stability:
Ensure that the calibration salts
SC
have been kept inside the sealed
containers and they have evidence of salt crystal and moisture inside.
Shake them up ready for use. Ensure that the
SC
calibration salts are
at the same room temperature as the humidity probes you are about
to calibrate.
Use only between
15
– 30
Celcius.
Application to probe:
Remove the grey plastic cap from the
SC
calibration salt and shake it
once more. Fit it to the probe you are calibrating and ensure there is a
reasonably air tight seal around it (you may need to use the grey
adaptor ring supplied with the instrument if the probe is smaller than
the 18mm diameter of the inside of the
SC.
Readings:
Leave the
SC
calibration salt to equilibrate with the humidity probe for
a
minimum of 30 minutes
at stable temperature .
Check the calibration (1% rh tolerance
– see the humidity at different
temperatures on the label on the side of the
SC
).
Examples of SC humidities @ 25
Celcius.
SC33 ................... 32.8%
SC58 ................... 57.6%
SC84 ................... 84..3%
