© Sensortech Systems, Inc. 2016 Page of 13 Rev.8-2016
ST-3300 Ceramic Face Sensor Installation Guidelines
Locatin the Sensor
Select a location to install the Sensor where the board product being measured will remain flat
during travel over the Sensor location for the full length or width of board.
Avoid locations where the contact (vertical height) between the board and Sensor may change
during board travel due to changing slope or roller height change on conveyor.
Care must be taken to position the Ceramic Face Sensor level with the top of the adjacent rollers.
Maintaining contact with the ceramic face and preventing vertical board movement while arriving,
travelling over and leaving the Sensor results in the best measurement accuracy.
A typical Sensor mounting location is using the recommended saddle or a Mounting Beam
supported by height adjustable posts mounted to the cement floor centered between level rollers
approx.6 to 8 inches (15-20cm) apart.
Preparin for the installation
1. Select a suitable location for the Ceramic Face Sensor where the spacing between rollers
allows the installation of the Sensor so that the board travels smoothly and evenly
approaching and leaving the Sensor location. This requires level rollers. Do not mount any
portion of the ceramic face of the Sensor below belts or metal framework. The Sensor length
should be aligned so that the entire ceramic face is covered by the board stream. Normal
measurement area is x 5 inches (22. x 12.7cm) for the Sensor with an overall size of 12 x
7 inches (30.5 x 17.8cm). Allow for some side to side board movement.
2. Fabricate support posts and mounting for installing the Sensor on posts attached to the
cement floor to reduce vibration. High vibration may damage the Sensor. Ensure the support
posts have height adjustment for Sensor to roller and board alignment.
3. Two M12 cables connect the smart sensor to the I/O unit. We recommend these cable be
run through conduit for their protection.
4. Run cables for Low Voltage Signals from the I/O Unit to the plant control panel in conduit or
cable tray.
5. The I/O Unit requires single phase 50-60 Hz 0-250VAC @ 0.1KW.
6. Connect cabling to I/O Unit terminal blocks for A/C Power, RS-485 serial links and/or a 4-
20mA output for moisture value. See Table 1 & 2.
7. Run 14-18AWG Earth Ground wire from local ground point to Sensor Antenna mounting
location and to I/O Unit mounting location. This ground is for RF shielding and is required for
best measurement accuracy.
Important: Do not mount the Sensor where excessive heat transfer will occur. Operating
temperature in excess of 140°F 60°C will result in permanent damage.
Provide a local Earth Ground for the Sensor. Ensure a mounting tab of the Sensor is
connected to local Earth Ground. Add a 14-18 AWG direct wire connection from the
Sensor Antenna to a local Earth Ground potential. Ensure the Sensor Antenna is also
grounded to a process frame or conveyor frame, etc. This is not a safety requirement, but
may influence instrument performance.
