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…)

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

Sizing a Current TransformerThe 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. The secondary winding has multiple turns to provide a lower output current, as shown in the diagram. This allows the meter to be located away from the high current circuit. (more…)

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…)

The Taut-Band Analog Meter

Taut-Band Suspension System vs Pivot and Jewel Mechanisms

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…)