Author name: Areej

Different types of calibration

Definition and Need for Calibration According to Webster’s Dictionary, calibrate means “to check, adjust, or standardize systematically the graduations of a quantitative measuring instrument.” As noted in Inter-Range Instrumentation Group (IRIG) 118-98 Volume I, “a telemetry system measurement begins with the sensing of a measurand by a transducer located either on a test vehicle or …

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How to Troubleshooting  4 -20 mA Current Loops with Loop Calibrator?

Introduction Special-purpose electronic test instruments called loop calibrators are manufactured for the express purpose of 4-20 mA current loop circuit troubleshooting. These versatile instruments are generally capable of not only measuring current, but also sourcing current to unpowered devices in a loop, and also simulating the operation of loop-powered 4-20 mA transmitters. A very popular loop calibrator unit is the Altek …

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How Quantum Tunneling Composites works?

Introduction First produced in 1996, the Quantum Tunneling Composite (QTC) is a composite material made from micron-sized particles conductive filler particles combined with a non-conducting elastomeric binder, typically silicone rubber. The unique method of combining these raw materials results in a composite which exhibits significantly different electrical properties when compared with any other electrically conductive …

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Simple motor operation using PLC

  PLC  Ladder motor  Problem: Controlling the running state of the 1 ph motor by PLC ; pressing START and STOP pushbuttons i.e. motor should remain in ON state after START pushbutton is pressed and should OFF when STOP pushbutton is pressed. Checking if the Motor is running normally by pressing TEST pushbutton.   Number of PLC …

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Math Instructions for PLC

Introduction The majorities of the instructions take two input values, perform the specified arithmetic function, and output the result to an assigned memory location. For example, both the ADD and SUB instructions take a pair of input values, add or subtract them, and place the result in the specified destination. If the result of the …

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