ProMinent Aegis-II, Руководство по сборке и эксплуатации, Страница: 50 / 102

Programming the Inputs
Page 50 of 102
position. Press the
F2
key to choose
alpha
,
lower case letters. Notice that the F2 choice
now shows NUMBERS. That would be the
next choice.
8- Use the arrows to change the ‘e’ to ‘l’ and
continue until your word is spelled.
9- When finished, press
OK
to save.
9.4 Selecting an Analog Sensor Type
ProMinent amperometric sensors are compatible
with the Aegis II via the isolated 4-20mA Input driver.
Once the sensor type is selected, the controller will
scale the input, provide calibration limits for the type
selected, and clamp the measured sensor values so
that an open loop does not measure a negative
value.
If your 4-20mA device is not on this list above,
choose ‘other’ and enter the scale manually. See
procedure following the pre-configured 4-20mA
chart
9.4.1 Selecting the sensor type:
1 Press
MENU
2 Scroll up to
System
. Press
OK
3 Scroll down to
Set Sensor Type
. Press
OK
4 Scroll down to the 4-20mA input where the
sensor is connected. Press
F3
SELECT
5 Scroll down until you see the type of sensor
you have and press
OK
6 Press
F1
to select the probe range.
7 Use the up/down arrows to change the
range as needed. Press
F2
SELECT to
save. Press
ESC
9.5 Analog Sensor Cleaning and
Calibration
9.5.1 General remarks
Combination probes for the measurement of
pH and redox-ORP potential consist of a
measuring electrode
– a glass electrode for
pH, a platinum or gold electrode for redox
measurement and a reference electrode,
arranged concentrically around the measuring
electrode.
ORP sensors measure more than just
chlorine.
The only acceptable calibration is to a calibrated mV
source, not an oxidant residual. ProMinent recommends
testing the probe for movement and adjusting the set-
points if necessary, to reach the desired oxidation control
range.
Table 12 4-20 mA Sensor