Sensortech Systems ST-3300 Series Manuale utente

ST-3300 Smart RF Sensor

Technical Manual

2221 E. Celsius Avenue, Unit B

Oxnard, California USA 93030

Tel ( 05) 9 1-3735

Fax ( 05) 9 1-373

[email protected]

www.Sensortech.com

ST-3300 Smart RF Sensor Technical Manual

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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,

photocopying, recording, or otherwise, without the prior written consent of Sensortech Systems. Sensortech

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,

OR NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO OCCURRENCE WILL SENSORTECH SYSTEMS BE LIABLE

FOR ANY CONSEQUENTIAL, INDIRECT, EXEMPLARY, SPECIAL, OR INCIDENTAL DAMAGES, INCLUDING ANY LOSS

OF DATA OR LOST PROFITS, ARISING FROM YOUR USE OF THE DOCUMENTATION.

Sensortech, the Sensortech.com logo, and other designated rands included herein are trademarks of

Sensortech Systems, Inc. All other trademarks are the property of their respective owners.

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

ST-3300 Smart RF Sensor Technical Manual

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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

ST-3300 Smart RF Sensor Technical Manual

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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

ST-3300 Smart RF Sensor Technical Manual

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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.

ST-3300 Smart RF Sensor Technical Manual

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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

ST-3300 Smart RF Sensor Technical Manual

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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.

ST-3300 Smart RF Sensor Technical Manual

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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

. 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:

= Sensor Antenna Frequency

= High Reference Frequency

= Low Reference Frequency

The raw moisture value for Moisture is calculated from the equation:

Moisture = STD * B coefficient * (D

– 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)

= 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

Diode

Drivers

Phase

Detector

R R

Freq.

out

Isolated

Power

Supply

+5v

-5v

-12v

+12v

Figure 3: Sensor RF PCB Block Diagram

Micro-processor and

Control Logic

ST-3300 Smart RF Sensor Technical Manual

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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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