Sensortech Systems ST-3300 Series Manuel utilisateur
© Sensortech Systems, Inc. 2016 Page 1 of 13 Rev.8-2016
ST-3300
Ceramic Face Sensor
with Attached Sensor Electronics Unit
Installation Instructions
Sensortech Systems, Inc.
2221 E. Celsius Avenue Unit B
Oxnard, California USA 3030
805- 81-3735 main
805- 81-3738 fax
www.sensortech.com
© Sensortech Systems, Inc. 2016 Page 2 of 13 Rev.8-2016
ST-3300 Low Temperature Moisture Measurement System
The main components in the system are:
3.
Fi ure
1
.
Ceramic Face Sensor Antenna with
Attached Sensor Electronics Unit
Power/Interface Option
2. ST-3300 I/O Unit – a NEMA4 rated metal enclosure
containing +/-15V DC power supply and control
signals for the Ceramic Face Sensor with Attached
Sensor Electronics Unit. The I/O Unit connects to
the user’s A/C power and provides terminal blocks
for user interface to RS-485, 4-20mA output and
Digital Input signals.
1. ST-3300 Ceramic Face Sensor with Attached
Sensor Electronics Unit – a ceramic face sensor
designed to be in contact with the board product
mounted between rollers. T
he Sensor Electronics
Unit is mounted directly below the Sensor
Antenna. The Sensor is rated for +32 to +122°F
(0 to +50°C) operation. The Sensor Electronics
Unit is contained in a NEMA4 rated metal
enclosure containing the RF moisture
measurement and control electronics. Power
requirements are +15V/-15V dual 40W supply.
Communications are via RS485 and self-
powered, isolated 4-20mA output. The
Power/Interface Option shown below which
conveniently provides necessary power and I/O
connectivity.
Fi ure
2
.
I/O Unit
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Fi ure
3
.
System Wirin Dia ram
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Fi ure
4
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Sensor Installation Dia ram
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Fi ure
5
.
12 x 7 inch (30.48 x 17.78cm) Ceramic Face Sensor Dimensions
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Fi ure
6
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Example of Mountin Saddle for Ceramic Face Sensor Installation
© 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.
© Sensortech Systems, Inc. 2016 Page 8 of 13 Rev.8-2016
Mountin the Sensor
The Sensor is typically mounted after the dryer between rollers level with the top of adjacent
roller surfaces. The Ceramic Face Sensor with Attached Sensor Electronics Unit is rated from
0°C to 50°C ambient temperature and should be mounted on a low vibration adjustable posts
mounted to the cement floor. The Sensor is attached to the mounting saddle or mounting beam
using the four mounting holes on the ends of the Ceramic Face Sensor frame (see Figure 5 & 6).
The Ceramic Face Sensor construction allows board product to contact the ceramic face for
moisture measurement.
The Ceramic Face Sensor is attached to the Mounting Saddle or mounting beam using adjustable
vertical posts with the four 0.25 in (6.3mm) diameter holes on the tabs located on each end of the
Sensor.
An important alignment is for the Ceramic Face Sensor to be level with the product being
measured. If one end of the ceramic face is further away (not in contact) with the product than the
opposite end, it will be less sensitive to changes in moisture than the end of the ceramic face that
is in contact (closer) to the product.
Board product should be in contact with the Ceramic Face Sensor with no air gap between the top
of the Sensor to the bottom of the board product for the full length and wide of the ceramic face.
The antenna and sensor should be isolated as much as possible from conveyor vibration.
Vibration can loosen nuts, bolts, and electronic components.
Due to the close roller spacing for non-rigid board products, it may be necessary to shorten a roller
located where the Sensor will be installed. See Figure 4.
Levelin the Rollers
Use a level or straight edge that spans at least 6 rollers. Lay the level or straight edge across the
three rollers before the Sensor and three rollers after the Sensor. Place level on the rollers near
the bearing ends.
Shim the two outer rollers’ bearing assemblies so that they are level.
Shim the remaining four rollers’ bearing assemblies so that each roller is within 0.01 inches
(.25mm) of level.
Lay the level along the first roller. Shim its bearing assembly on the other side so that it is level
lengthwise.
Lay a level across the six rollers near their ends.
Shim the last roller’s bearing assembly so that it is level with the first roller.
Shim the remaining four rollers’ bearing assemblies so that each roller is within 0.01 inches
(.25mm) of level.
© Sensortech Systems, Inc. 2016 Page 9 of 13 Rev.8-2016
Bearing
Shim
Conveyor
Frame
Level
Rollers
Level
Roller
Fi ure
7
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Example of Roller Ali nment
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Mountin the I/O Unit
The ST-3300 I/O Unit is typically mounted near the Sensor in a conveniently accessible location
for periodic maintenance and calibration tasks. Two standard M12 cables are used to connect
the Sensor Electronics Unit to the I/O Unit. The M12 cables come in standard lengths of 33 ft.
(10m). An important consideration for the I/O Unit location is the need to maintain the ambient
temperature below 50°C.
The I/O Unit is wired via two wire 4-20mA and/or 5 wire RS-485 interface to the plant master
control for monitoring and control.
Fi ure 8.
I/O Unit Dimensions
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