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User Manual EE1900 Humidity Module for Climate Chambers
4.3 Error Indication on the Analogue Output (NAMUR)
The EE1900 features an error indication on the analogue output according to NAMUR
recommendations. A device failure is indicated by 11 V in case of voltage output and by 21 mA
in case of current output.
Important:
Upon delivery the NAMUR error indication is disabled. It can be enabled with the free EE-PCS Product
Configuration Software.
5 Automatic Sensor ReCovery (ARC)
Certain chemical pollution may lead to drift of the sensing element. Using the sensor recovery function,
the contamination is removed by a controlled heating of the sensor. After the heating process, the sensor
quickly returns to normal measuring conditions (refer to Fig. 5).
Start:
The ARC can be started either manually by pressing the “Sensor Recovery” button (No. 6 - Fig. 3) for
min. 3 seconds or automatically by applying a voltage of 5 - 30 V DC to the potential free input (No. 3
“Heat IN“ - Fig. 3) for at least 3 seconds.
Abortion:
To cancel the ARC process, the same procedure is valid as to starting it: pressing the “Sensor
Recovery” button (No. 6 - Fig. 3) or a voltage of 5 - 30 V DC at the “Heat IN“ interface for min. 3
seconds.
Duration:
A sensor recovery cycle takes around 23 minutes, of which 20 minutes heat-up time, followed by 3
minutes cooling time. The cooling time is necessary also in case the ARC process is cancelled.
Current consumption in ARC mode
Supply
Consumption
15 V DC
~120 mA (max.)
24 V DC
~80 mA (max.)
35 V DC
~55 mA (max.)
17 V AC
~210 mA
rms
(max.)
24 V AC
~160 mA
rms
(max.)
29 V AC
~140 mA
rms
(max.)
+
GND
Power supply
5 - 30 V DC
+
GND
GND
GND
Pulldown:
≤
100 k
Power supply
5 - 30 V DC
in
out
ARCStatus
V
Galvanically separated input/output
Fig. 4
ARC trigger and status connection
Important:
ARC can only be started if RH < 85%.