Xylem IQ SensorNet FDO 70x IQ (SW) - Manual (Page 20)

Measuring / Operation FDO
®
70x IQ (SW)
4 - 2 ba76014e01 02/2012
 With air temperatures under 5 °C we recommend performing the
function check and user calibration not in air but in air-saturated
water that has a higher temperature. You obtain air-saturated water
by pouring water several times in and out of two vessels so that it
sparkles.
4.2.2 Function check
A function check is the simplest way to determine whether the sensor
needs to be cleaned or user-calibrated.
Principle The function check can either be done in water vapor-saturated
air or in air-saturated water (see C
HECK OR CALIBRATION MEDIUM on
page 4-1).
Steps Generally, a check on the IQ S ENSOR N ET is carried out as follows. Sys-
tem specific details are given in the respective IQ S ENSOR N ET system
operating manual.
2 cm
1 Switch to the measured value display with
m
and select the
FDO
®
70x IQ (SW) sensor.
2 Press
c
.
The next step switches on the maintenance condition for the
sensor. A corresponding message appears on the display.
3 Confirm the note with
g
.
The maintenance condition is active.
4 Select the TEST procedure and press
g
.
5 Put the sensor into the calibration position (water vapor-satu-
rated air or air-saturated water - see section 4.2.1).