ProMinent DULCOMETER DMT Series Operating Instructions Manual page 30

DMT settings
Constant If you have selected constant under "output"
The current pH/redox value is displayed under "meas. value" for
monitoring purposes.
This setting serves as a function check. During calibration or checking of the
ORP probe, the output current increases to 23 mA.
7.1.6.4 General setting: output current = measured value + adjustable +
In this general setting, the DMT can be adjusted as shown in 7.1.6.1 or
7.1.6.3. The following differences should be noted:
pH
For DMT pH, the output current remains at the output current value last
reported (HOLD function) during calibration. The output current freezes the
moment the menu option "input" is exited using the CAL key. This output
current corresponds to the last measured pH value. The HOLD value of the
output current is held until the calibration is completed. It is also possible to
set a certain HOLD value in the first measuring point of the calibration menu
(see 8.2.2).
Redox
With regard to DMT redox, the output current increases during calibration of
the ORP probe to the output current value last displayed (HOLD function)
upon activation of the ENTER key. This output current corresponds to the last
measured redox value. The HOLD value of the output current is held until the
menu "checking of redox probe" is exited.
7.1.6.5 General setting: output = 4 mA
No info display appears in the operating menu.
The DMT emits a constant output current of 4 mA.
This setting serves as a function check and is selected if the DMT is to be
used purely as a display device (current consumption is minimal in this case!).
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Enter under "l" any output current between 4 and 20 mA.
HOLD
(= 3 in identity code)
(= 4 in identity code)
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