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9.1 SRH400 check using the display
If the SRH400 basic unit features a display, as soon as the reference probe is connected the display shall show the
corresponding RH and T reference values.
9.2 Check of the SRH400 outputs
For the SRH400 with voltage output, a voltmeter shall be connected as in Fig. 5.
power supply
for 0 - 1 V:
10 - 35 V DC
9 - 29 V AC
for 0 - 10 V: 15 - 35 V DC
15 - 29 V AC
power supply
20...35 V DC; R
L
<500 Ω
11...35 V DC; R
L
< 50 Ω
SRH400 - Analog volts
For the SRH400 with current output, an ammeter shall be connected as in Fig. 6.
power supply
for 0 - 1 V:
10 - 35 V DC
9 - 29 V AC
for 0 - 10 V: 15 - 35 V DC
15 - 29 V AC
power supply
20...35 V DC; R
L
<500 Ω
11...35 V DC; R
L
< 50 Ω
SRH400 - Analo milliamps
Make sure that the supply is appropriate for the output signal.
9.3 Humidity check
The table below shows the output signal for each reference probe.
Figure 5.
Voltage output
Figure 6.
Current output
Output
Humidity reference
4 to 20 mA
0 to 1 V
0 to 5 V
0 to 10 V
Reference probe 1
10 % RH
5.6 mA
0.1 V
0.5 V
1.0 V
Reference probe 2
90 % RH
18.4 mA
0.9 V
4.5 V
9.0 V
