Scale-Tron, automation, sensors and weighing systems

AquaSense - accessories

AquaSense moisture sensor is available as a stand-alone sensor or as a "Complete Kit" which includes mounting flange, 10 ft (3m) cable and junction box including relay for connection to the feed gate valve or conveyor.  These and other accessories are listed below.  Not all accessories are listed or illustrated;  contact us if you have a question.

Mounting flange

The standard mounting method is through a bin wall.  Since the wall is sloped to guarantee flushing of the bin, this same angle ensures that material sweeps over the faceplate, keeping it free from buildup. To install the sensor, cut a hole in the bin wall for the sensor, drill the four bolt holes and bolt the flange to the wall.  If the bin contains sand, dig a hole in the sand with a crowbar and then insert the sensor until the faceplate is vertically above the center of the discharge gate.  

Junction box

The waterproof plastic junction box contains a metal carrier that slides out to facilitate the cable connections.  On the terminal block are 24 volt power inputs, analog output, digital RS232 and RS485 bidirectional outputs as well as three alarm outputs.  Options include input relay for the gate or conveyor signal (standard in "Complete Kit"), and output solid-state relay for low level alarm.  Relays are 110 VAC standard but can be replaced with any voltage if specified with order.  Connections are fully compatible with AquaSense sensors.



Connecting cable

The junction box is normally placed in any convenient place near the sensor and the 10 ft cable is sufficient for this.  A 4-conductor shielded cable carries power and analog signal to the control system.  Other arrangements are available for digital transmission and for programming/calibration.  If it is more convenient to locate the junction box at a greater distance, 20 ft (6m) and 50 ft (15m) lengths are available.  The cable may also be connected directly to control equipment without use of the junction box.

View shows junction box, closed, with 10 ft (3m) cable.

Programming cable

The programming cable connects from the junction box to a PC or laptop computer.  Three pins engage the mating sockets in the terminal block and the other end terminates in an RS232 connector.  Since most computers no longer have this type of port, you will also require a RS232 to USB converter, available below or from any computer store.

With the programming cable connected to your computer, you can run the GUI software to monitor moisture and temperature, set up the parameters or calibrate the sensor.  One cable can be used for all sensors in the same plant.  Cables are compatible with previous model, AquaSense sensor.


24 volt DC power supply

Normally the AquaSense sensor is powered by the 24 volt DC power already available from the batch controller.  When a batch controller is not used or when no 24 volt power is available, this power supply can be used.  Fully UL and CE compliant for use inside a cabinet or stand-alone, this regulated supply with detachable power cord powers up to 10 sensors, either AquaSense or AquaMix, or a combination of sensors and other equuipment up to 1.5 A maximum.  Supply voltage is 110 - 250 volts AC 50/60 Hz.


USB Converters

To convert the digital signal from the AquaSense to USB format for PC computers, a selection of converters is available.  Different models handle RS232, RS485 formats and signal isolation where power surges and lightning can destroy electronic equipment.  The RS232 connection allows a PC or laptop computer to set up and calibrate a single sensor while RS485 allows two or more sensors to share the same line to the computer for setup, calibration and monitoring of the moisture and temperature readings.



Digital moisture display 1278

The moisture display is powered directly from the 4-20 mA analog output from the sensor.  If multiple sensors are used, each sensor requires a separate display.

These displays are current powered;  each sensor can also be connected to the input of a PLC or computer by wiring these in series with the display.  The 4-20 mA current output preserves the full accuracy of the sensor, even with long cable runs.

The display is available as a waterproof wall-mounting box (at left) or as a panel-mounting bare board meter, model 1279 (at right).  Both are electrically identical.