Your moisture sensor needs to be mounted and connected
Not all accessories are listed or illustrated; contact us if you have a question.
Weldable AquaMix mount
AquaMix 2270D‘s weldable mount is welded to the body of the mixer after cutting a hole in the body and liner plate. Its four jackscrews hold the clamping flange in place with the sensor’s faceplate flush with the mixer’s interior surface. As the liner plates wear, you must adjust the moisture sensor to again be flush with the surface. This avoids chipping of the faceplate’s surface. You achieve this by adjustment of the nuts on the jackscrews.
AquaSense/AquaMix clamping flange
The flange clamps the sensor tightly to avoid slippage due to forces within the mixer. Mount the combination of moisture sensor and flange on the four jackscrews of the weldable mount. Position the faceplate flush with the interior surface of the mixer. Fill the gap between sensor and liner plate with a special abrasion-resistant epoxy grout. This provides a smooth transition from the liner plate to the sensor faceplate.
The waterproof plastic junction box for both AquaSense 2280D and AquaMix 2270D 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 / RS485 and three alarm outputs. Options include an output solid-state relay for high moisture alarm. Relays are 110 VAC standard but we can replace these with any voltage if you specify on your order.
You should normally place the junction box in any convenient position within 10 ft of the moisture sensor. A 4-conductor shielded cable carries power and analog signal from here to the control system. Other arrangements are available for digital transmission and for programming/calibration. If you need to locate the junction box further away, use the 20 ft (6m) and 50 ft (15m) lengths. You can also connect the cable directly to control equipment without use of the junction box.
View shows junction box, closed, with 10 ft (3m) 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. It monitors moisture and temperature, sets up the parameters or calibrates the sensor. You can use the one cable for all sensors in the same plant.
24 volt DC power supply
Normally, you should moisture sensor from the 24 volt DC power already available in the batch controller. This power supply is for use if no other 24 volt power is available. The regulated supply with detachable power cord powers up to 10 sensors. These can be AquaSense, AquaMix or a combination of sensors and other equipment. Maximum output is 1.5 A. It is fully UL and CE compliant for use inside a cabinet or stand-alone. Supply voltage is 110 – 250 volts AC 50/60 Hz.
To convert the digital signal from the sensor 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. RS485 allows two or more sensors to share the same line to the computer. This allows setup, calibration and monitoring of the moisture and temperature readings. You can connect both AquaSense and AquaMix sensors to the same RS485 line.
Digital moisture display 1278
Although the AquaSense 2280D or AquaMix 2270D moisture sensor is normally connected to a control system, some custom measurement systems need a digital display. The moisture display receives its power from the 4-20 mA analog output from the sensor. If you use multiple sensors, each sensor requires a separate display.
These displays are current powered. You can also connect the sensors to PLC or computer inputs by wiring them 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). Also available as a panel-mounting bare board meter, model 1279 (at right). Both are electrically identical.
For an overview of all moisture related products, see Moisture Measurement