YSI IQ S ENSOR N ET TriOxmatic 701 IQ - Manual (Page 21)

TriOxmatic
®
701 IQ Measuring / Operation
4 - 5 ba76047e01 01/2012
4.3 Function check
The function check is the simplest way of letting you know whether the
sensor needs to be cleaned and calibrated.
Note
The function check can either be performed in water vapor-saturated
air or in air-saturated water.
In the case of air temperatures under 5 °C we recommend to perform
the function check not in air but in air-saturated water that has a higher
temperature.
Note
The function check is carried out in the measuring mode, % saturation.
When switching to the measuring mode % saturation, information on
linked outputs is lost.
Function check in water
vapor-saturated air
Proceed as follows:
Note
If there are large temperature differences between the sample and the
air above the surface of the water, a balancing period of more than
15 minutes may be required.
1 Take the sensor out of the measuring solution and position it
approx. 2 cm above a water surface, best in a narrow bucket or
similar container with water. When doing so, no liquid should
be brought on the membrane.
2 cm
2 Wait at least 15 minutes for the temperature to adapt.
3 In the sensor setting table, select the measuring mode %
(unit %) and switch to the measured value display with
m
.
4 Read the measured value and determine whether it lies within
the range of precision required by the user.