Tag: Measurement & Control
-
How Capacitive Probes are Used to Measure Level
Capacitive probes can be used to measure the depth of liquids and solids. A rod, normally coated with PVC or PTFE, is inserted into the tank and the capacitance measured to the tank wall. The capacitance has two components C1 above the surface and C2 below the surface. As the level rises C1 will decrease…
-
Sources of Coherent Interference/Noise in Instrumentation Systems
Introduction The knowledge of how to design low noise instrumentation systems is an essential skill that any practicing instrumentation engineer should strive to learn because noise and interference affects any measurement system in one way or the other and this in turn affects the precision of measurements and the detectability of the quantity of measurement.…
-
Radar Level Transmitters: Operating Principle & Applications
Radar level transmitter basically employs electromagnetic waves to determine the fluid level in a tank. It converts level information into a 4-20 mA signal and transmits it to the controller; this signal may then be used in a measurement and control loop to control a process. The level is also displayed by an inbuilt display…
-
CAMAC (IEEE-583) Modular Instrumentation Standard
The IEEE-583, IEEE-595, and IEEE 596 CAMAC (Computer Aided Measurement and Control) standards define a hardware and data transmission system which is used to house, support and communicate with various compatible instrumentation modules. A typical CAMAC crate shown in Figure 1.0 below is a physical package which has 25 slots or powered stations for compatible,…