8
A-96.250.321 / 191015
AMI Solicon4
Product Description
Input
For potential-free contact to freeze the signal outputs or to interrupt
control in automated installations (
hold
function or
remote-off).
Communica-
tion interface
(optional)
USB interface to store logger data.
RS485 interface with fieldbus protocol Modbus, Profibus DP or
Webserver connection via Modbus.
Safety
Features
No data loss after power failure. All data is saved in non-volatile
memory.
Over voltage protection of in- and outputs.
Galvanic separation of measuring inputs and signal outputs.
The analyzer is factory tested and ready for installation and opera-
tion.
Temperature
compensation
The mobility of ions in water increase with higher temperature
which enlarges the conductivity. Therefore, the temperature is mea-
sured simultaneous by an integrated Pt1000 temperature sensor
and the conductivity is compensated to 25 °C.
M
easuring
principle
When a voltage is set between two electrodes in an electrolyte so-
lution, the result is an electric field which exerts force on the
charged ions: the positively charged cations move towards the neg-
ative electrode (cathode) and the negatively charged anions to-
wards the positive electrode (anode). The ions, by way of capture
or release of electrons at the electrodes, are discharged and so a
current
I
flows through this cycle and the Ohms law
V = I×R
ap-
plies. From the total resistance
R
of the current loop, only the resis-
tance of the electrolyte solution, respectively its conductivity
1
/
R
, is
of interest.
The cell constant of the sensor is determined by the manufacturer
and is printed on the sensor label. If the cell constant has been pro-
grammed in the transmitter, the instrument measures correctly. No
calibration must be done, the sensor is factory calibrated.
