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5.1.6 Status
Overall, the DMU can assume four different statuses, which provide information
about the current loop and the measurement of the current.
Ok:
Cable break:
Underflow:
Overflow:
Error evaluation:
5.1.7 Temperature
Under the "Temperature" tab, the currently measured temperature is displayed in real
time.
5.1.8 Display
Under Orientation, the orientation of the display can be rotated by 180°. The WTR
120-DMU can also be mounted overhead (cable outlet upwards).
5.1.9 Fault current
The overflow and underflow function can be activated or deactivated using the "Un-
derflow/Overflow" check box, which can be found under "Error current". If the func-
tion has been activated, the DMU outputs a current of 20.5mA when the measured
temperature exceeds the maximum temperature of the 4..20mA loop and 3.5mA
when the measured temperature falls below the minimum temperature of the
4..20mA loop. If the function is deactivated, a current of 20mA and 4mA flows in the
event of overshooting or undershooting. Regardless of the overflow and underflow
function, a current of 21mA always flows if there is a cable break in the temperature
sensor (PT1000).
5.1.10 4..20mA current output
Under the "4..20mA current output" tab, the current of the current loop is displayed in
real time and the scaling of the loop is configured. To do this, the minimum tempera-
ture value for 4mA and the maximum temperature value for 20mA must be specified.
promesstec GmbH I Niedersachsenstraße 4 I D-48465 Schüttorf I Tel.:+49 (0)5923/ 90 229 0 I Fax:+49 (0)5923/ 90 229 29
the DMU is working properly.
there is a cable break in the connected PT1000.
the measured temperature is smaller than the smallest value that
can be transmitted with the 4..20mA interface.
the measured temperature is greater than the largest value that
can be transmitted with the 4..20mA interface.
there is an error in the evaluation of the PT1000.
E-Mail: office@promesstec.com I Internet: www.promesstec.com
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