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B&B Electronics TCDA Manual

K-type thermocouple amplifier
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Not Recommended for New Installations.
Please contact Technical Support for more information.
K-type Thermocouple Amplifier
Model TCDA
Documentation Number TCDA0997
This product
Designed and Manufactured
In Ottawa, Illinois
USA
of domestic and imported parts by
B&B Electronics Mfg. Co. Inc.
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5100
Internet:
http://www.bb-elec.com
orders@bb-elec.com
support@bb.elec.com
Copyright © 1997 by B&B Electronics Mfg. Co. All rights reserved.
Documentation Number TCDA0997 Manual
Cover Page
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5104

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Summary of Contents for B&B Electronics TCDA

  • Page 1 Not Recommended for New Installations. Please contact Technical Support for more information. K-type Thermocouple Amplifier Model TCDA Documentation Number TCDA0997 This product Designed and Manufactured In Ottawa, Illinois of domestic and imported parts by B&B Electronics Mfg. Co. Inc. 707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 PH (815) 433-5100 -- FAX (815) 433-5100 Internet: http://www.bb-elec.com...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1: INTRODUCTION ..............1 ......................1 EATURES ....................1 ACKING ......................2 OFTWARE ....................2 PECIFICATIONS CHAPTER 2: THERMOCOUPLE OVERVIEW........... 3 CHAPTER 3: CONNECTIONS ............... 5 ......................5 VERVIEW ................ 5 HERMOCOUPLE ONNECTIONS ................. 5 OWER UPPLY ONNECTIONS ..................

  • Page 3: Chapter 1: Introduction

    Chapter 1: Introduction Features The TCDA is a thermocouple amplifier that can be used with B&B Electronics’ Data Acquisition modules to measure temperature using a PC. The two channels of the TCDA support K-type thermocouples. The amplifier has an output range of 0VDC to +5VDC. The standard TCDA can measure temperatures between -50 C and 200 C.

  • Page 4: Software

    Software Software used with B&B Electronics’ SDAXX, SPDA and ADIO12 modules to control the TCDA module is included with the TCDA. This software is very similar to the software included with the SDAXX, SPDA and ADIO12 module but with some minor modifications.

  • Page 5: Chapter 2: Thermocouple Overview

    Chapter 2: Thermocouple Overview To understand the operation of the TCDA it is necessary to understand the basic construction of the thermocouple. thermocouple consists of two solid wires, composed of dissimilar metals, joined at one end. The joining of dissimilar metals generates a small DC voltage based on the temperature of this junction.
  • Page 6 The error caused by the thermocouple non-linearity over the -50 C to 200 C range is relatively small, so it is ignored in the factory calibration of the TCDA. If more accurate readings must be taken, the following techniques can be used: 1.

  • Page 7: Chapter 3: Connections

    Chapter 3: Connections Overview This chapter will discuss the connections required to operate the TCDA thermocouple amplifier. Connections between the A/D converter and the TCDA should be kept as short as possible. Thermocouple Connections The TCDA can amplify voltage from a K-type thermocouple. Only one thermocouple can be connected to each channel.
  • Page 8 Thermocouples channel 1 channel 2 Pin 17 and 18 are internally connected in the TCDA to provide +5V to REF+ in the XXXSDAXX and XXXSPDA modules (AGND to AGND in the ADIO12 module). RS-232 RS-485 Port TC #0 A/D ch. TC #1 A/D ch.

  • Page 9: Chapter 4: Calibration

    Chapter 4: Calibration Overview The standard TCDA module is calibrated at the factory for a temperature range of -50 C to 200 C. With a resolution of 20mV/ C and an offset voltage of -1.0VDC. The offset voltage shifts the negative voltages produced at temperatures below 0 C to voltage greater than 0VDC.

  • Page 10: Calibration Procedure For Modified Tcda Modules

    1. Remove the cover from the TCDA module. 2. Connect thermocouple to terminal blocks T1+ and T1- as described in Chapter 3 (T2+ and T2- for channel 2). 3. Plug power supply in 2.5mm power jack and plug supply into wall outlet.
  • Page 11 1. Remove the cover from TCDA module. 2. Connect thermocouple to terminal blocks T1+ and T1- as described in chapter 3 (T2+ and T2- for channel 2). 4. Plug power supply in 2.5mm power jack and plug supply into wall outlet. 5.

  • Page 12: Chapter 5: Voltage-To-Temperature

    Chapter 5: Voltage-to-Temperature In standard TCDA modules the low temperature is -50 C and the high temperature is 200 C. These temperatures correspond to an output voltage between 0 and 5VDC. The Voltage-to-Temperature Conversion Equation for standard TCDA modules is shown below. Voltage-to-Temperature Conversion Equation Vout Voff Temperature C...

  • Page 13: Chapter 6: Software

    Chapter 6: Software Included with the TCDA module is a diskette with software examples written in Borland C++, Borland Pascal and Microsoft® QuickBASIC v4.5. These DOS-based example program show how to access the TCDA module connected to the following modules: 232SDA10 232SDA12 232SPDA...

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