JUMO dTRANS pH 02, Operating Manual, Page: 116 / 136

18 Appendix
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Min./max. value memory
This storage records the minimum and maximum input quantities that have
occurred. This information can be used, for example, to assess whether the
design of the connected sensor is suitable for the values that actually occur.
The max./min. value memory can be reset,
see chapter 6.7.6 "Delete min/max values", page 37ff.
Temperature compensation
The pH value of a measurement solution depends on the temperature. Since
the pH value is not always measured at the reference temperature, the device
is able to perform a temperature compensation.
The sensor signal for the ammonia measurement is temperature-dependent.
The device can perform temperature compensation.
Special controller functions: Separate controllers
This function is normally deactivated (factory setting or select "No").
In the deactivated state, the software prevents the two controller outputs from
being able to work "against each other". So, for example, it is not possible to
dose acid and lye at the same time.
If the controllers are separate ("Yes" selection), each controller can be freely
configured.
Switch-off of the I-component
This function is normally deactivated (factory setting or select "No").
In the deactivated state, the controller works in accordance with general
controller theory.
When I-component switch-off is activated ("Yes" selection), the part of the
output level that can be traced back to the I-component is set to zero when
the setpoint is reached.
This can be useful with mutual neutralization (acid and lye dosing both
possible) in one treatment tank.
Datalogger
Recording duration = about 10 hours with a storage interval of 1 second
Recording duration = about 150 days with a storage interval of 300 seconds
Asymmetrical connection of pH electrodes
Typically pH electrodes are connected asymmetrically to the transmitter. The
connection corresponds exactly to the structure of a pH electrode in terms of
impedance.
For the asymmetrical connection, the glass electrode is connected to the
electronics with a high impedance and the reference electrode is connected
with a low impedance. Most transmitters are designed for this connection
type.
The redox potential of a measurement solution is not temperature-dependent!
Temperature compensation is not required.