Let’s explore the most important tests defined in the standard. Each test is performed while the transmitter is under reference conditions, and then one influence quantity is varied at a time.
The supply voltage is varied between its minimum and maximum specified limits (e.g., 12V to 42V DC for a loop-powered transmitter). The output deviation is measured. A well-designed transmitter should show negligible change (<0.005% of span per volt).
This standard ensures that results are repeatable and comparable across different manufacturers and laboratories by requiring tests to be conducted under strictly defined "reference conditions". Key Technical Aspects IEC 61298-2:2008 iec 61298-2
is an international standard titled: "Process measurement and control devices – General methods and procedures for evaluating performance – Part 2: Tests under reference conditions."
is more than a technical document—it is the language of trust between transmitter manufacturers and end-users. It provides a repeatable, scientifically rigorous methodology to answer the fundamental question: “How accurate is my transmitter, really?” Let’s explore the most important tests defined in
: Measurements must be taken in both increasing and decreasing modes to account for hysteresis.
In the world of industrial automation and process control, the reliability of a single measurement can mean the difference between optimal production and catastrophic failure. At the heart of every control loop lies a transmitter—whether for pressure, temperature, level, or flow. But how do engineers and end-users truly know a transmitter will perform accurately when the ambient temperature swings from freezing to scorching, or when electromagnetic interference floods the plant floor? The output deviation is measured
The international standard is a critical framework for the instrumentation and control industry, specifically addressing the evaluation and testing of process measurement and control devices. As the second part of a four-part series, it focuses on the methods for evaluating the static performance of these devices under standard conditions. Scope and Purpose
However, the standard’s true power lies in its definition of and how to test their effects. It provides manufacturers and calibration laboratories with a uniform methodology to determine how much a transmitter’s output will drift when exposed to changing environmental conditions.