aci 0002627, User Manual

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Stationary Photoionization Detector SPID2
User Manual
SPID2 - User Manual (en) - 1.11.docx
Analytical Control Instruments GmbH, Volmerstraße 9A, D-12489 BERLIN, Germany, www.aci-berlin.de
Version 1.11
Page 26 of 60
6.2.4. Current Loop (4 ... 20 mA or 0 … 5 mA)
The device is equipped with an analog current loop output, which converts the physical measurement
result into an electrical signal. The device provides a 3-wire current loop output, which operates over
the entire supply voltage range. The most common resistor in a 4
… 20 mA loop is 250 ohm; however,
depending on applied supply voltage the maximum load resistance must be considered.
Supply Voltage Maximum Load Resistance (R
LOAD
)
+9 V DC 330 Ohm
+24 V DC 1 000 Ohm
+36 V DC 1 500 Ohm
The output current (4
… 20 mA or 0 … 5 mA) and the corresponding signal range (0 … 20 000 ppm) can
be selected.
Example 1 Example 2 Example 3
Measurement result 80 ppm 80 ppm 12 ppm
Output range 4 … 20 mA 4 … 20 mA 0 … 5 mA
Signal range 0 … 100 ppm 0 … 1000 ppm 0 … 50 ppm
Output current 16.8 mA 5.28 mA 1.2 mA
9 … 36 V DC
24 V DC typical
4 … 20 mA
R
LOAD
+
-
I
OUT