HygroSmart HS3 User’s Manual
Michell Instruments
7
OPERATION
2.4.6 Electrical
Requirements
The HygroSmart HS3 Probe requires a supply voltage from 5 to 28 V DC.
2.4.7 Electrical
Connections
The electrical connections, as seen when looking at the base of the probe, are shown
in the following schematic:
2
1
3
4
5
Modbus
Analog
Cable Color
1
Comms A
Output 1
Brown
2
Comms B
Output 2
White
3
0 V
N/C
Blue
4
+5 V to +28 V +5 V to +28 V
Black
5
0 V
0 V
Gray
Figure 10
Electrical Connections
Note: M12 mating connector/cables are not supplied with the Probe, but can
be ordered as an accessory. They are available in 2, 5 & 10 meter lengths.
2.4.8 Digital Serial Output
The connections for Modbus RTU over RS485 communications are detailed in
Figure 10.
In order to enable digital comms, both pins 3 & 5 should be grounded. See Appendix B for
mire details.
NOTE: The probe will not output digital and voltage signals simultaneously.
2.4.9 Analog Voltage Outputs
The HS3 Probe will be set up, when ordered, to one of the following selection of voltage
outputs:
0 - 1 V
0 - 2.5 V
0 - 5 V
0 - 10 V
These voltage outputs can be recon
fi
gured at any time using one of the available
Maintenance Kits, in conjunction with the HS3 Probe Application Software.
