Xylem YSI FDO 700 IQ H, Руководство по эксплуатации, Страница: 20 / 48

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ba76178e01 10/2014
Measuring / Operation FDO
®
70x IQ H

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 H 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 <OK> .
The maintenance condition is active.
4 Select the TEST procedure and press <OK> .
5 Put the sensor into the calibration position (water vapor-satu-
rated air or air-saturated water - see section 4.2.1).
6 Press <OK> .
The sensor starts the check. The display switches to the mea-
sured value display. The
CAL indicator flashes instead of the
main measured value. At the same time, the momentary rela-
tive slope flashes as the secondary measured value with the
addition of
TEST . The process ends automatically as soon as
the measured values meet the criterion for the stability control.
With a great temperature difference between the sensor and
the environment this may take a while. Subsequently, the main
measured value and temperature are displayed.