4-20mA using TT230 applications
4-20mA Solutions to Isolate Loops, Split Signals, Convert High-Voltages Applications
TT233 Resource Finder
Application Notes and Technical Briefs
4-20mA using TT230 applications
Application Note: Thermocouple Transmitters Monitor Temperatures in Paint Systems
Using Acromag's TT230 series to monitor high temperatures in an automotive paint curing oven and transmit to the existing PLC 4-20mA input card/software setup.
White Paper: Temperature Measurement Using RTDs 8500-917 (part 2)
Abstract: A RTD or Resistance Temperature Detector is a passive circuit element whose resistance increases with increasing temperature in a predictable manner. In choosing one you must consider a RTDs temperature coefficient of resistance (TCR), its relative sensitivity, its accuracy and repeatability, interchangeability, stability and drift characteristics, its insulation resistance, its response time, plus its packaging and the thermal transfer mechanism between the sensed material and the sensor element. You must also consider the negative effects of corrosion and contamination, shock and vibration, self-heating, meter loading, and in some cases, even thermoelectric effects. (part 1, 8500-911; part 3, 8500-918) (registration is required)
Whitepaper: Introduction to the Two-wire Transmitter & the 4-20mA Current Loop
Abstract: In many control loops, we use two-wire transmitters to convert various process signals representing flow, speed, position, level, temperature, pressure, strain, pH, etc., to 4-20mA DC for the purpose of transmitting the signal over some distance with little or no loss of signal. This paper reviews the operation and advantages of the 4-20mA transmission standard and the use of loop-powered transmitters. (registration is required)
White Paper: The Importance of Isolation
Learn How to Recognize the Need for Isolation
Examining important aspects of electrical isolation, what it does for you, why it is needed, and how to test for it.
Acromag is in the business of signal conditioning. We manufacture circuits that amplify, isolate, filter, and convert one signal form to another. Most of these circuits also provide electrical isolation. But added isolation has a cost and our customers sometimes question their need for isolation, or fail to recognize the need for adding isolation in their application. This paper covers the basic aspects of electrical isolation, what it does for you, why you need it, and how we test for it. (registration is required)
White Paper: Temperature Measurement Using Thermocouples 8500-911 (part 1)
Abstract: You are probably somewhat familiar with the thermocouple, but you must understand that choosing the type (J, K, T, etc.) is not as simple as just picking a compatible temperature span. You must give consideration to the sensor materials, the ambient temperature range, the sensor's sensitivity, and its reaction with the measurement environment. You must also be aware of the inherent limitations of the thermocouple and potential error sources. This white paper will help you to make an informed selection between sensor types and avoid potential problems in your application. Part 1 of 3 (registration is required)
White Paper: Thermocouple and RTD Temperature Sensor Selection 8500-918 (part 3)
Abstract: This white paper will summarize and compare some common aspects of both sensors to help you choose between the two in your quest to find the best sensor for your particular industrial application. Part 3 relies heavily on information provided in parts 1 and 2 and you should review parts 1, 8500-911 and 2, 8500-917 before reading this material. (registration is required)
The Essentials of Single-Ended and Differential Voltage Measurement Learn How to Choose Which Method to Apply
Acromag manufactures circuits that amplify, isolate, filter, and convert one signal form to another (signal conditioning). This is essentially what we do, but more simply stated, Acromag manufactures circuits that measure voltage, because that is exactly what we do most of the time. These papers look at important aspects of single-ended and differential voltage measurement, and offer some insight on why it might be better to choose one method over the other. They will also dispel some of the myths and misconceptions of voltage measurement and show how to correctly apply earth ground to these connections. (registration is required).
Part 1 of 2 (8501-035) covers single-ended voltage measurement. Read Part One Here
Part 2 of 2 (8501-068) reviews differential voltage measurement. Read Part Two Here