| Standard | Focus | Key Difference | |----------|-------|----------------| | | General performance testing of process instruments | Broad influence & dynamic tests | | ISO 9001 | Quality management system | Not device-specific | | IEC 61508/61511 | Functional safety (SIL) | Includes systematic capability + random failures | | NAMUR NE 107 | Device diagnostics | Only for failure handling | | ANSI/ISA 75.02 | Control valve flow testing | Only for valves | | ASTM E74 | Force transducer calibration | Only calibration, not environmental |
Its strength lies in systematic influence testing and rigorous uncertainty control . However, it is obsolete in parts (EMC references, missing reliability) and incomplete for digital, wireless, or safety-related devices.
The standard defines the method for determining the performance of the device:
The standard requires a series of "calibration cycles." Typically, this involves increasing the input signal in steps (e.g., 0%, 25%, 50%, 75%, 100%) and then decreasing it back to zero. This reveals: How closely the output follows a straight line.
: The device must sit in the reference environment for a specified period to achieve thermal and electrical equilibrium. iec 612982
: The finite range through which an input signal can be varied without initiating any noticeable change in the output response.
Only if they cite the specific part and test conditions. A manufacturer claiming "tested to IEC 61298" without stating the part number and reference conditions is offering little value. Always ask: Which part? What influence quantities? Under what environmental range?
In high-risk industries like oil and gas, knowing the exact hysteresis and error rate of a pressure sensor is vital for safety systems (SIS).
This article will break down the five parts of IEC 61298, explain how they differ from other standards (like IEC 61508 for functional safety), and show you how to apply them in real-world scenarios. | Standard | Focus | Key Difference |
Part 4 provides :
However, if you are looking for a "paper" or guide related to loop checks and commissioning, you likely mean :
I/P converters (current-to-pressure), signal isolators, digital-to-analogue bridges
Part 2 tests the instrument in a "perfect" environment (reference conditions). Part 3 tests it under extreme conditions (high temperature, vibration, humidity). This reveals: How closely the output follows a straight line
The device may be allowed to warm up or be cycled through its range to ensure stability.
This is the introduction and overarching guide to the entire series. It details the general principles and procedures applicable to all process control devices, including both models. Part 1 is the starting point for understanding how to structure the overall evaluation process.
that are defined by specific input/output variables and transfer functions. iTeh Standards Key Performance Features Evaluated
Beyond the major scope and structural changes, the 3rd edition also includes a general editorial revision and an update of key terminologies to ensure clarity and international consistency.