
Model 4420-V001
DIGISTANT
®
Page 27
-
Switch on the device and connect it as shown above.
Selection of the thermocouple
-
Press the FCT and TC keys. The "TC selection" display appears.
-
Using the
→
or
←
key, select the desired thermocouple.
Selection of the reference junction
-
After that, press the
▲
or
▼
key and select "Measure:.....".
-
Then use the
→
or
←
key to select "Measure:4-20 mA".
-
Acknowledge with ENT .
-
The temperature values last allocated to the current values of 4 mA and 20 mA are then
displayed.
-
Modify the temperature limits or acknowledge the present entry with ENT .
4.2.3.4 4-20mA: Measurement after the thermocouple and a
linearresponse voltage transducer. Rated output-current range:
4-20mA
In this mode, a thermocouple with a reference junction based on 0 °C is exposed to the
temperature to be registered at the measurement point.
The thermocouple is connected in series to a U-/I transducer which converts the output voltage
of the thermocouple linearly into a current and supplies it to the DIGISTANT
®
.
To be able to calculate the temperature at the measurement point from the measured current,
the DIGISTANT
®
requires
-
the temperature corresponding to the lowest current value (4 mA) and
-
the temperature corresponding to the highest current value (20 mA).
DIGISTANT
®
4420-V001
Eingang
Input
-
+
Thermoelectric
wire
4 - 20 mA
Power supply
Transducer
Содержание DIGISTANT 4420-V001
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