Pressure & temperature calibration notes

Electronic transmitters

The Importance of Calibration

Properly operating instruments are critical to plant safety and product quality. To calibrate process instruments, it is essential that controlled conditions and measurement signals present in the actual process installation are simulated.

Input and Output Measurement Standards

For an analog electronic pressure transmitter a variable signal source provides a pressure input at the same values as used in the process, and a precision input standard measures the calibration input. A regulator is used to precisely control the input pressure. The range of the transmitter determines the input measurement standard. The output of the...

Flow & Level Calibration Notes

Differential Pressure Transmitter Calibration

Introduction

In the Differential Pressure Transmitter, as flow increases, the differential pressure increases, and when flow decreases the differential pressure decreases. For example, an orifice plate is placed in a pipe to restrict the fluid flow. This restriction creates a pressure drop that can be converted to flow rate. The differential pressure transmitter measures the pressure drop created, by...