Manual

User Manual HYDACLab

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23.10.2008

4.2 Analogue output

Analogue output signals representing measured values are output sequentially to PIN 4, when

synchronization with the controller interfaced to the sensor is required.

The sequencing of the signals involved is as shown in the diagram below:

All signals output to the analogue output are 4..20 mA current-loop signals, sequenced and

spaced as follows:

Output signal Duration

Start signal: 20 mA 2 s

______________________________________________ Pause (4 mA) 2 s

Signal 1: n.c. 0% (12 mA) 2 s

Pause (4 mA) 2 s

Signal 2: relative change in dielectric constant -30% ... +30% 2 s

Pause (4 mA) 2 s

Signal 3: relative humidity 0% ... +100% 2 s

Pause (4 mA) 2 s

Signal 4: temperature -25°C... +100°C 2 s

Pause (4 mA) 2 s

Signal 5: status signal See table below for levels 2 s

Pause before next output cycle: 4 mA 30 s

Start

n.c

Rel.

humidity

Temp.

Status

Start

20mA

4mA

30s