Several mechanical input sensors, as well as some sensors which measure humidity or temperature, operate by the transduced quantity causing a change in capacitance, which in turn, is converted to an analog output voltage by an ac bridge circuit or … Read more
Tag: Transducers and Sensors
The Principle of Operation of Optical Encoders
An encoder is a device that provides a digital output as a result of an angular or linear displacement.
The position encoders can be grouped into two categories:
- Incremental encoders, which detect changes in displacement from some datum position.
- Absolute
The Construction & Principle of Operation of Load Cells
A load cell converts a force (usually the gravitation force from an object being weighed) to a strain which can then be converted to an electrical signal by strain gauges. A load cell will typically have a local circuit as … Read more
Features & Configuration of a Smart Pressure Transmitter
Smart/Intelligent pressure transmitters are microprocessor-based, and they provide additional functional capabilities beyond their basic role of just sensing and representing a process variable; for example they provide computing, diagnostics, and networking capabilities .
We shall consider a capacitive sensing … Read more
The Conditioning of Thermocouple Sensor Voltages
Consider the circuit below:
From the figure above, the sensing junction and reference junction are connected in series. When the junctions are at the same temperature the voltage output from the junctions is zero … Read more
How to Connect a DP (Differential Pressure) Flow Sensor to a DP Transmitter
The DP Transmitter should be mounted with a manifold block as illustrated in the figure 1(a) below to allow for maintenance.
Valves B and C are the isolation … Read more
Instrumentation Sensors and Transducers – Multiple Choice Questions & Answers (MCQ4)
The Answers have been provided at the end of the Questions:
Q1. Which of the following sensors is used to measure displacement?
A. Thermistor
B. LVDT
C. Dall tube
D. None of the above
Q2. Which of the below … Read more
Types of Sensors used in Measurement and Process Control
A sensor is an element in a measurement system that detects the magnitude of a physical variable or parameter and changes it into a signal that can be processed by the system. The active element of a sensor is often … Read more