Introduction to Process Calibrators

Process calibrators are handheld, battery-powered instruments used for field testing and calibration of industrial process equipment. The typical calibrator has a one or two-parameter digital display, function switch and up/down buttons for output level adjustment. Some models have a dial knob for level adjustment, which many users say is quicker to adjust. Common types of process calibrators are voltage, loop, temperature, and multi-function. (more…)

CT Ratio Formula

Current Transformer Turns Ratio & Polarity

An instrumentation Current Transformer (CT) is used to step down AC current to a level that can be more easily measured by a panel meter or test instrument. The amount of step down is specified by the CT ratio (e.g. 300:5). (more…)

How to Size a Current Transformer

The Current Transformer (CT) is used to sense AC current in single-phase or three-phase circuits. In the basic instrument-grade current transformer, a single primary conductor passes through the core. (more…)

Digital Panel Meter

Differences Between LCD and LED Displays

Digital panel meters (or DPM) typically uses either an LCD (Liquid Crystal Display) or LED (Light-Emitting Diodes) to display information in an alphanumerical format. What are the differences between LCD’s and LED’s and how do you know which one to pick for your application? Read on to find out! (more…)

switchboard meter with Taut-Band Suspension System

The Taut-Band Analog Meter

The frictionless, shock-proof, taut-band suspension system has demonstrated superiority over the pivot-and-jewel mechanism in all types of analog panel meters. (more…)