Figure 1: Connecting The Sensor (Overview) - Hydronix Hydro-Probe Configuration And Calibration Manual

Introduction
2 Measuring Techniques
The sensor uses the unique Hydronix digital microwave technique that provides a more sensitive
measurement compared to analogue techniques. This technique facilitates a choice of
measurement modes (not available in all sensors, see relevant sensors installation guide for
technical specifications). The default mode is F Mode which is suitable for all material but
particularly sand and aggregates. For more information about which mode to select please
contact Hydronix: support@Hydronix.com
3 Sensor Connection and Configuration
The moisture sensor may be remotely configured using a digital serial connection and a PC
running Hydro-Com sensor configuration and calibration software. For communication with a PC,
Hydronix supply RS232-485 converters or a USB Sensor Interface Module (See User Guide
HD0303)
Note: All references to Hydro-Com in this user guide refer to software version 2.0.0 and
higher. The sensor can be configured using older versions of Hydro-Com however
some features will not be available. See the relevant Hydro-Com user guide for more
details.
There are two basic configurations for connecting the sensor to a batch control system:
•
Analogue output – A DC output is configurable to:
•
4-20 mA
•
0-20 mA
•
0-10 V output can be achieved using the 500 Ohm resistor supplied with the sensor
cable.
•
Digital – an RS485 serial interface permits direct exchange of data and control
information between the sensor and the plant control computer. USB and Ethernet
adapter options are also available
The sensor can be configured to output a linear value of between 0-100 unscaled units with the
material calibration being performed in the control system. Alternatively it is also possible to
internally calibrate the sensor to output a real moisture value.
Sensor

Figure 1: Connecting the Sensor (Overview)

Power supply
+15V - 30 Vdc, 1A min.
2 x Analogue output
0- 20mA, 4 - 20mA, 0 - 10V
Digital inputs/Output
RS485 serial
communications
Configuration and Calibration Guide HD0679 Rev 1.2.0 13
Chapter 1