Sensortech Systems ST-2200 Installation Instructions Manual

ST-2200 Sensor

with Attached Electronics

Installation Instructions

© Sensortech Systems, Inc. 2016 Page 1 of 16 Rev.7-2016

Sensortech Systems, Inc.

2221 E. Celsius Avenue Unit B

Oxnard, California USA 93030

805-981-3735 main

805-981-3738 fax

www.sensortech.com

ST-2200 Sensor System:

Figure

2. ST-2200

Sensor

The two main components in the system are:

1. ST-2200 Processor Unit (Processor) – an intelligent measurement and control unit that
connects to the Sensor Electronics Unit and provides moisture measurements via serial, 4­20mA and front panel LED display. The Processor is also referred to as the Signal Processor.

Figure 1. ST-2200 Processor Unit

2. ST-2200 Sensor with Attached Sensor Electronics (Sensor) – a NEMA12 rated metal

enclosure containing the moisture measurement and RF switching electronics is attached to
the bottom side of the open-frame planar sensor. The Sensor is mounted in-line on the
outside of the dryer. The Sensor with Attached Sensor Electronics is also referred to as the
Antenna.

© Sensortech Systems, Inc. 2016 Page 2 of 16 Rev.7-2016

with Attached Electronics Unit

ST-2200 Sensor System Installation Guidelines

Locating the Sensor:

Select a location to install the ST-2200 Sensor where the board will remain flat over the Sensor
for the full length or width of board travel over the Sensor.

Avoid locations where the air gap between the board and Sensor may change during board travel
due to changing slope or roller height on Dry End Transfer conveyor or Takeoff Cascade.

Preventing board bounce while arriving, travelling over and leaving the Sensor results in the best
measurement accuracy. In addition, it is desirable to prevent a board impacting the Sensor due to
board bounce or changing angle of approach or departure from the Sensor.

The spacing between the top of the Sensor to the bottom of a board is critical for good
measurement accuracy. The specification for the air gap between the board and Sensor is 0.25
inches (6.35mm). A typical ST-2200 Sensor is installed on a Mounting Beam centered between
level rollers 12-18 inches (30-45cm) apart.

When measuring board traveling over the Sensor for the full length of the board, the
recommended minimum distance from the end of the Take-off Cascade is calculated as follows:

Sensor Location = Longest Board Length + 1 Roller (from the Take-off Cascade)

i.e. if the Longest Board Length = 14 feet (4.3m) and the roller spacing is 12-18 inches (30-

45cm) then the mounting beam for the Sensor should be installed greater than 15 feet
(4.6m) from the end of the Take-off Cascade.

When measuring board traveling over the Sensor for the full width of the board, the
recommended minimum distance from the Inverter on the Dry End Transfer is calculated as
follows:

Sensor Location = Widest Board Width + 1 Roller (from the Inverter)

i.e. if the Widest Board Width = 4 feet (1.22m) and the roller spacing is 12-18 inches (30-

45cm) then the mounting beam for the Sensor should be installed greater than 5 feet
(1.5m) before the Inverter.

© Sensortech Systems, Inc. 2016 Page 3 of 16 Rev.7-2016

Preparing for the installation:

1. Fabricate and install a height adjustable beam for installing the Sensor after the kiln or dryer
between the rollers. Ensure the adjustment range allows the Sensor to be positioned at 0.25
inch (6.35mm) spacing from bottom of board when resting on rollers.

2. Run a 10-16 AWG Earth Ground wire from local ground source to Sensor mounting location.

3. Mount the Processor Unit in the desired location per supplied drawings (see Figure 7 & 8). It
is recommended to mount the Processor Unit near the Sensor mounting location and run the
4-20mA cable for moisture output to the control room Process Controller / PLC.

4. Install conduit or cable run for Processor Cable from the Sensor to the Processor Unit.

5. Provide AC plug receptacle for main AC power to Processor Unit (110-240VAC 20A Service).

6. Run an Earth Ground wire from local ground source to Processor Unit mounting location.

7. Install any external equipment / PLC cabling to Processor Unit terminal block signals (RS-232
serial link, 4-20mA loop, external alarms, product detectors, etc.).

Important:

Do not mount the Sensor with attached Sensor Electronics Unit where excessive heat
transfer will occur. Ensure that Sensor is located away from exhaust gases venting from
the dyer to prevent measurement drift or electronics failure due to the attached Sensor
Electronics Unit over-heating.

Provide an Earth Ground for the Sensor. Ensure a side plate of the Sensor is connected to
local Earth Ground. Add a 10-16 AWG direct wire connection from the Sensor with
attached Sensor Electronics to a local Earth Ground potential. Ensure sensor frame is
grounded to process frame or conveyor frame, etc. This is not a safety requirement, but
may influence instrument performance.

© Sensortech Systems, Inc. 2016 Page 4 of 16 Rev.7-2016

© Sensortech Systems, Inc. 2016 Page 5 of 16 Rev.7-2016

Figure 3. 12

-

inch (30.48cm) Sensor Dimensions