HYDAC HLB 1300 User Manual
Page 20
User Manual HYDACLab
®
23.10.2008
5
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
t
Start
n.c
.
Rel.
DC
Rel.
humidity
Temp.
Status
Start
20mA
4mA
I
2s
30s
2s