Remote transmitter out of range
Thread Content
Question: What are the consequences if a remote pressure gauge or temperature gauge is used to measure values that exceed its range?
When it exceeds the range, the maximum range is displayed
What do you mean by consequences? Safety? It comes down to either the process aspect or the automation aspect; safety and process considerations need to be determined based on the specific conditions at the site. If we’re talking solely from an automation perspective, then the maximum value will definitely be displayed on the computer (the scale on the computer matches that at the site), and any values exceeding this range will not be shown
Within the maximum range, it has no effect on the instrument; for example, for thermoresistors, the range is 0~650°C, and for pressure transducers using diaphragms, the range is 0~3.5 MPa. Any value within this range can be used – for instance, a pressure of 0~1 MPa, with an actual value of 1.5 MPa – and this will not affect the instrument, but the system will issue an alarm indicating that a reading cannot be displayed
Check the maximum measurement range indicated on the gauge; if it exceeds this range, the gauge will be damaged. If it doesn’t exceed the range, you can adjust the measurement scale setting
Could you explain how it was damaged, and which components were damaged?
In general, instruments do not necessarily get damaged when they exceed their maximum range. For example, pressure transmitters have a maximum overload pressure that is much higher than their maximum range; however, there are also some pressure measuring elements whose overload pressure is close to their maximum range, and exceeding this limit prevents the elastic components from returning to their original state. For temperature measurement, it’s fine if values exceed a certain level, just like with thermocouples and thermal resistors
What was said on floor 10 made things clear: the sensor components were unable to function properly later on because they were subjected to operating conditions that exceeded their limits