SIZE

Diameter 108mm, Length 140mm.

FIXING

Secured to fixing plate welded to underside of mixer by a clamp ring which allows the depth of mechanical penetration of sensor to be adjusted. The maximum thickness of mixer base including wearing plate is 60mm. Recommended size of circular cut out in mixer to accommodate sensor 127mm.

CONSTRUCTION

Body: Stainless Steel (304) End Cap: Stainless Steel (304) Faceplate: Syalon ceramic

RANGE OF MOISTURE

Dependent on material properties. For standard concrete mixes the sensor will measure up to approximately 15% (dry weight basis). For lightweight aggregates the range will be higher.

PENETRATION

Approximately 75-100mm dependent on material.

SUPPLY VOLTAGE

Wide range power supply input 15 - 30Vdc (recommended nominal supply voltage 24Vdc). Requires approximately 140mA at +15Vdc, 100mA at 24Vdc.

TEMPERATURE

Operating temperature 0-60 degrees C. N.B. The sensor will not measure moisture in frozen materials.

ANALOGUE OUTPUT

Configurable 0-20mA or 4-20mA current loop source. For 0-10Vdc output an external 500R load resistor or 'compatibility mode' cable is required.

DIGITAL INPUT

A 24Vdc digital input is provided for batch average start/stop or moisture/temperature multiplexing purposes. N.B. The digital input return is connected to the power supply return.

RS485

Opto-isolated RS485 2-wire port. Uses Hydro-Link communications protocol for read/write access to sensor parameters and values.

REFRESH RATE

Outputs are updated approximately 25 times per second.

MEASURED VALUES

Including: Instantaneous (smoothed) unscaled and moisture percentage; Filtered unscaled and moisture percentage; External temperature 0-60¡C ±1 degree C.
Digital filtering can be configured from the Hydro-Link Diagnostic software to condition the sensor reading to suit the application.

CONNECTIONS

The sensor is fitted with a 10-way MIL-SPEC connector. A 4 metre 8-way cable pre-wired for connection to a waterproof termination chamber is available.
In 'compatibility mode', a 4 metre 6-core screened cable fitted with 6 pin 'Bulgin' male and female connector and 500R load resistor can be used for 0-10V applications when the HP-02 is used to replace an existing sensor.
The use of this cable is not recommended for new installations and does not allow RS485 operation. Click here to see connection diagrams.

EXTENSION CABLE

For multi-drop RS485 applications, a screened twin twisted pair cable can be used to supply both power and interface connections. The cable core diameter should be rated according to the maximum number of sensors in use.

For point-to-point analogue applications with no RS485 requirement, a screened twin-twisted pair is recommended.

For 0-10V applications a 500R load resistor should be mounted at the user equipment. When used with the 'compatibility mode' cable, a 6-core screened cable with 16/0.2mm strands should be used to minimise the signal voltage drop in the cable. Cable length maximum 500m.

GROUNDING

The sensor body is connected to the cable shield. Power input and signal interfaces are galvanically isolated both from the sensor case and from each other. Care must be taken to prevent cable shields from carrying ground noise and fault currents which they are not designed to do. Ensure equipotential bonding of all exposed metalwork.

ELECTROMAGNETIC COMPATIBILITY

Meets the requirements of the Electromagnetic Compatibility Directive 89/336/EEC.