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Fieldbus Transmitters Calibration and Ranging

S Bharadwaj Reddy
Calibration and ranging for a FF device is similar in principle to any other “smart” measurement instrument. Unlike analog instruments, where the “zero” and “span” adjustments completely define the instrument’s...

Instruments Calibration Procedures

S Bharadwaj Reddy
Calibration refers to the adjustment of an instrument so its output accurately corresponds to its input throughout a specified range. The only way we can know that an instrument’s output...

Difference between Calibration and Ranging

S Bharadwaj Reddy
The concepts of calibration (trimming) and ranging are often difficult for new engineers of instrumentation to immediately grasp. A simple analogy useful for understanding these topics is that of setting...

Smart Transmitter Calibration Tutorial Part 1

S Bharadwaj Reddy
Calibration can be carried out using a handheld communicator in the field, a laptop on the bench in the workshop, or from intelligent device management (IDM) software as part of...

Smart Transmitter Calibration Tutorial Part 2

S Bharadwaj Reddy
Range Setting (Re-range)  Range setting (re-ranging) refers to setting the scale for the 4 mA and 20 mA points. This scale is usually referred to as “calibrated range” or “calibration...

Smart Transmitter Calibration Tutorial Part 3

S Bharadwaj Reddy
Transmitter Output Current Trim (Analog Trim) It is rare for the analog output current circuitry of a 4-20 mA transmitter to drift. However, should the analog output current be incorrect,...

Important Terms in Calibration

S Bharadwaj Reddy
The term “calibration” in the context of smart/intelligent transmitters is often misunderstood. The information provided here serves to explain the difference between sensor trim, range setting, and current trim. Plants...

Instrument Zero and Span Calibration

S Bharadwaj Reddy
Every instrument has at least one input and one output. For a pressure sensor, the input would be some fluid pressure and the output would (most likely) be an electronic...

Transmitter Calibration Procedure

S Bharadwaj Reddy
In today’s environment of shrinking cost margins and increased regulations, maintaining properly calibrated equipment becomes ever important. Even the smallest inaccuracy in process measurements can cause a significant loss in...

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