Sensortech Systems ST-3300 Series Bedienungsanleitung
ST-3300 Smart RF Sensor
Technical Manual
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Oxnard, California USA 93030
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ST-3300 Smart RF Sensor Technical Manual
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© Sensortech Systems, Inc. 2016
Sensortech Systems, Inc. is disclosing this material to you solely for use to operate hardware devices and
software we manufacture. You may not reproduce, distri ute, repu lish, download, display, post, or transmit
the documentation in any form or y any means including, ut not limited to, electronic, mechanical,
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Systems expressly disclaims any lia ility arising out of your use of the documentation. Sensortech Systems
reserves the right, at its sole discretion, to change the documentation without notice at any time. Sensortech
Systems assumes no o ligation to correct any errors contained in the documentation, or to advise you of any
corrections or updates. Sensortech Systems expressly disclaims any lia ility in connection with technical support
or assistance that may e provided to you in connection with the information.
THE DOCUMENTATION IS DISCLOSED TO YOU “AS-IS” WITH NO WARRANTY OF ANY KIND. SENSORTECH
SYSTEMS MAKES NO OTHER WARRANTIES, WHETHER EXPRESS, IMPLIED, OR STATUTORY, REGARDING THE
DOCUMENTATION, INCLUDING ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE,
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OF DATA OR LOST PROFITS, ARISING FROM YOUR USE OF THE DOCUMENTATION.
© 2016 Sensortech Systems, Inc. All rights reserved.
Sensortech, the Sensortech.com logo, and other designated rands included herein are trademarks of
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ST-3300 Smart RF Sensor Technical Manual
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Preface
About The Manual
This manual is intended to provide a technical reference for configuring and operating the newest Sensortech
ST-3300 Series Smart RF Sensors and software. Installation guidelines are provided in the Wiring and Installation
document provided with the Sensor. New and experienced users will enefit from the detailed technical
information and operating instructions for Sensortech hardware and software options and accessories.
In this manual, the ST-3300 Series Smart RF Sensors are also referred to y the general term “Gauge”.
Hardware Revisions and Software Versions covered y this manual:
ST-3300 Series Hardware Revision: A (and a ove)
ST-3300 Series Firmware Version: 0.04 (and a ove)
ST-3300 Series Configuration Software Version: 1.000 (and a ove)
The manual is organized as follows:
1. Quick Start Guide
2. Sensor and hardware installation information.
3. Sensortech software installation and PC requirements.
4. Overview of the Sensor and software configuration.
5. Overview of Product Cali ration using the Sensor.
6. APPENDIX.
7. RS-485 ModBus Specifications
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Table of Contents
Preface ........................................................................................................................................................................3
A out The Manual ..............................................................................................................................................3
Ta le of Contents .......................................................................................................................................................4
Introduction ................................................................................................................................................................6
Sensor Physical Installation ........................................................................................................................................6
System Overview ........................................................................................................................................................6
Sensor Electronics ......................................................................................................................................................8
Resonant Frequency Dielectric Measurement ................................................................................................ 11
Open Frame Planar Sensor Antenna Measurement ....................................................................................... 16
Sensor Antenna Design ........................................................................................................................................... 19
Theory of Operation ................................................................................................................................................ 20
Radio Frequency Dielectric Measurement ...................................................................................................... 20
Moisture Determination y Dielectric Measurement ..................................................................................... 21
ST-3300 Configuration Software ............................................................................................................................. 22
Minimum Host PC Requirements .................................................................................................................... 22
Software installation ....................................................................................................................................... 22
Connecting to the Sensor using the RS-485 Interface ............................................................................................. 23
RS-485 Serial Communication - Host PC/PLC/Controller to I/O Unit .............................................................. 23
ST-3300 Configuration Program Operation ............................................................................................................. 24
Main Screen – at Startup ................................................................................................................................. 24
Main Screen – Sensor Connected .................................................................................................................... 25
Setup Screen .................................................................................................................................................... 27
Diagnostics Screen ........................................................................................................................................... 28
Measure Configuration Screen ........................................................................................................................ 30
Product Configuration Screen ......................................................................................................................... 34
I/O Configuration Screen ................................................................................................................................. 35
Cali ration Screen ........................................................................................................................................... 36
Offset Mode ..................................................................................................................................................... 37
Offset Cali ration Procedure ........................................................................................................................... 38
Linear Mode ..................................................................................................................................................... 38
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Suggestions for taking product samples.......................................................................................................... 40
Maintenance Screen ................................................................................................................................................ 41
Pre-Zero Cali ration ................................................................................................................................................ 42
Standardize Cali ration ........................................................................................................................................... 43
Pre-Zero Cali ration Procedure - using the Configuration Program ....................................................................... 44
Standardize Cali ration Procedure - using the Configuration Program .................................................................. 44
Pre-Zero Cali ration Procedure - using the I/O Unit Push- uttons ........................................................................ 45
Standardize Cali ration Procedure - using the I/O Unit Push- uttons ................................................................... 45
Appendix .................................................................................................................................................................. 46
Sensor Electronics Unit External Connectors .................................................................................................. 46
I/O Unit External Connectors .......................................................................................................................... 47
I/O Unit Terminal Board Layout ...................................................................................................................... 48
I/O Unit Terminal Board Signals ...................................................................................................................... 49
Sensor Status and Error Messages .................................................................................................................. 50
ST-3300 Sensor RS-485 Communications Interface Specification ........................................................................... 51
ST-3300 MODBUS-RTU Serial Communications Interface............................................................................... 51
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Introduction
Thank you for choosing Sensortech for your moisture measurement and analysis needs. The Sensortech ST-3300
Series of Smart RF Sensors are designed for use in industrial environments and provide the most sophisticated
on-line Sensors availa le, offering unmatched accuracy and relia ility.
The Sensors are shipped with all the accessories and custom options ordered. Please compare the contents with
the packing list to ensure all items are accounted for. If any items are missing or damaged, please contact
Sensortech immediately for further assistance.
Sensor Physical Installation
Every Sensor installation is unique and specific installation instructions are provided for the most common and
custom Sensor Application Interfaces. Please refer to the ST-3300 Wiring and Installation Guide for your specific
application.
System Overview
The ST-3300 Series Sensor is a complete measurement and interface system where all signal processing and
control functions are self-contained. It features multiple interface protocols including one isolated 4-20mA
output, an RS-485 serial communication port, a Digital Input and a Product Temperature Input. Optional
communications protocols include OI-6000 Operator Interface, Ethernet TCP/IP, DeviceNet, PROFIBUS,
PROFINET and EtherNet/IP as well as digital inputs and outputs for external sample gating and control.
The ST-3300 System is composed of the following components:
Sensor Antenna - an antenna that is located in close proximity to the Product eing measured and is either
directly attached for low temperature applications or remotely located for high temperature applications. The
Sensor Antenna is connected to the Sensor Electronics Unit through coaxial ca les.
Sensor Electronics Unit - a NEMA rated metal enclosure which houses 2 PCB’s – the RF PCB and the Processor
PCB. The RF PCB generates signals sent to the Sensor Antenna and provides frequency and voltage signals to the
Processor PCB for moisture and temperature value calculations. It connects to the I/O Unit and the Sensor
Antenna via M12 for power and signals as well as coaxial ca les to measure product moisture. The Processor
PCB controls the RF PCB and to read and manage data on the analog and digital interfaces.
I/O Unit - a NEMA rated metal enclosure which provides +/-15VDC power to the Sensor and allows the user to
install wires onto the terminal locks and connectors mounted on the I/O Unit PCB to provide AC power and
external analog and digital interfaces.
Product Temperature Transducer - a user defined peripheral pyrometer or transducer module that connects to
the Sensor Electronics Unit via a M4 x 4 pin connector for 4-20mA or voltage input via an M12 x 4 ca le.
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Figure 1: Example of In-Kiln Open Frame Planar Sensor System
Figure 2: Example of Out-of-Kiln Open Frame Planar Sensor System
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Sensor Electronics
The heart of the ST-3300 is a sophisticated dielectric Sensor. The Sensor utilizes state of the art phase lock loop
technology. High speed logic and ultra-high andwidth operational amplifiers enhance performance. A
microprocessor controls the RF measurement circuit and communicates with user defined protocol interfaces.
Figure 3 shows a lock diagram of the Sensor electronics.
Measurement is made y switching etween one of three RF channels: CA, CH, CL and Sensortech Systems
developed and patented a specific method of dielectric determination using radio frequency. This is known as
the resonant frequency technique. The purpose of the reference channels is to sta ilize the Sensor over a wide
range of am ient conditions. The three frequencies are measured y an on oard microprocessor and form the
inputs to a proprietary algorithm used to eliminate most drift factors.
CA connects to the Sensor Antenna element which is in close proximity to the product eing measured. CH
connects to the High Reference element and CL connects to the Low Reference element for precision reference
calculations.
Only one channel is switched in circuit per measurement sample, this forms a parallel tuned circuit with the
inductor. The resonant frequency of this network constitutes the "lock frequency" of the phase lock loop.
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The lock diagram of Figure 3 shows the inductor L forming a parallel tuned circuit with one of three channel
capacitances, C
X
. One capacitor is the Sensor electrode next to the product and the other two are reference
frequencies. Switching is performed y PIN diodes. The micro-processor sends control signals to measure each
channel sequentially.
The resulting frequency measurements are:
F
S
= Sensor Antenna Frequency
F
H
= High Reference Frequency
F
L
= Low Reference Frequency
The raw moisture value for Moisture is calculated from the equation:
Moisture = STD * B coefficient * (D
R
– Pre-Zero) + C coefficient
where: B coefficient = slope
cali ration coefficient for Product selected (SPAN)
C coefficient = offset cali ration coefficient for Product selected (ZERO)
STD = Standardization Factor (calculated)
D
R
= calculated raw dielectric value
Pre-Zero = calculated raw dielectric value with empty Sensor – air only from Pre-Zero Cali ration
Opto/
Isolator
Driver/
Isolator
Voltage
Controlled
Oscillator
Automatic
Gain
Control
A/R Sw
Pin
Diode
Drivers
Phase
Detector
R R
C
H
C
L
C
A
Freq.
out
Isolated
Power
Supply
+5v
-5v
-12v
+12v
Figure 3: Sensor RF PCB Block Diagram
Micro-processor and
Control Logic
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The Sensor measurement results are sent from the Sensor Electronics Unit to the I/O Unit via RS-485 interface.
The I/O Unit provides +/-15V power supply for the Sensor Electronics Unit and terminal oard connectors for
connection of the analog and digital interface signals to the user’s process control systems.
The I/O Unit also provides local push utton controls for performing the Zero and Standardize cali rations of the
Sensor. The user opens the lid of the enclosure and presses the Zero utton with nothing over the Sensor and
the Status LED next to the utton lights up to indicate a Zero cali ration has een performed. The user then
places a Standardization Plate over the Sensor and presses the Standardize utton. The Status LED next to the
utton lights up to indicate a Standardize cali ration has een performed.
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