ProMinent
®
Page 18
6 Function description
6.1 General
The DULCOMETER
®
MEASUREMENT TRANSDUCER (DMT) is a micro-
processor controlled on site measurement transducer. It displays the
selected measured variable and produces a proportional output signal. It can
also use temperature as a correction variable. The user can specify these
functions using the operating menu.
The user can switch between the measured variables pH value, redox
potential and temperature.
The inputs are collectively electrically insulated against the output.
In the event of a fault the DMT indicates an error message on the LC display
and produces an increased current (23 mA) through the ring circuit.
The DMT is also available for the following measured variables:
• Conductivity
• Chlorine
Block circuit diagram
Function description
Signal
output
4 ... 20 mA
at
16 ... 40 V DC
and/or
30 V DC
(PROFIBUS
®
variant)
µP
Keypad LC display
EEPROM
(parameter memory)
D
A
A
D
Measured
variable
temperature
FlashROM
(program memory)
Power supply,
current control
BA_DM_163_03_08_GB.p65 26.03.2008, 10:20 Uhr18
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