11
for a selected period (measurement phase) in a time interval (meas-
urement interval).
Continuous mode:
The device performs analyses in a set interval.
To calculate the measured value, the control is assigned the measur-
ing range end value of 5 ppm to the current value of 20.0 mA.
To calculate the measurement value, the controller requires the
measurement range final value for the reagent type used. This is as-
signed to the 20.0 mA current.
After an analysis, a current corresponding to the measurement value
is output. It is only adjusted to the new measurement value after the
subsequent analysis.
In measurement phase mode, a current of 4 mA shall be output out-
side of the measurement phase.
When using the RS232 interface, the Testomat
®
Modul CL transfers
its determined measurement result to the control system. All meas-
urement data and error messages are always transferred to the
RS232 interface, even if they are not used.
Measurement calculation
The current is calculated internally according to the following formula:
Thus, the measurement from the emitted current is calculated as fol-
lows:
The following table gives an overview:
Current in mA
Concentration in ppm
8
1,25
10
1,88
12
2,5
15
3,44
20
5
Measurements above 5 ppm
Attention! At concentrations > 5 ppm, 20 mA are emitted.
NOTE
