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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...

RTD Calibration Procedure

S Bharadwaj Reddy
Calibrating and testing RTD sensors :  Typically RTDs are checked while calibrating the connected device, such as a panel meter or temperature transmitter. However, if a problem is suspected with...

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...

What is Field Transmitter Damping ?

S Bharadwaj Reddy
The vast majority of modern field transmitters (both analog and digital) come equipped with a feature known as damping. This feature is essentially a low-pass filter function placed in-line with the...

Field Instrument Calibration Errors

S Bharadwaj Reddy
The efficient identification and correction of instrument calibration errors is an important function for instrument technicians. For some technicians – particularly those working in industries where calibration accuracy is mandated...

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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