A customer needed to re-range a Siemens SITRANS P DS III transmitter without applying pressure. He’d read my earlier blog post about using the pushbuttons to program the DS III (Pressure Transmitter Pushbuttons to the Rescue!), and where to find the Z-fold instruction sheet.
All was going to plan, until he started looking for the settings for lower range value (LRV) and upper range value (URV). And then, in an all-too-familiar scenario, he hit a roadblock. The instructions don’t actually mention URV and LRV, the terms he’s familiar with, by name or acronym. So what’s a guy to do?
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4-20 mA, Configuration, dp transmitter, high level, installation factors, level applications, low level, lower range limit, lower range value, LRV, pressure transmitter, pressure transmitters, Siemens, siemens sitrans, siemens sitrans p, SITRANS P, sitrans p transmitter, sitrans p transmitter display setting, transmitter programming, transmitter range, upper range limit, upper range value, URV, zero and span
People who have used Milltronics or Siemens ultrasonic continuous level measurement systems are used to the way configuration is done. It’s not uncommon that when they start up their first Siemens radar transmitter they encounter a stumbling block – the 4-20mA output doesn’t respond correctly.
The radar will start up and run, and if the tank level is low, they’ll get a valid level reading on the transmitter’s display, but the 4-20mA will be incorrect (too high a percentage). Or, if the tank level is at a medium or high level, both the indicated level in the display and the output will be maxed out at 20mA. It’s a misunderstanding about where the span measurement starts from. Read the rest of this entry »
20 mA, 4-20 mA, 4mA, calibrating echomax sensor, calibrating Siemens radar, calibrating Siemens ultrasonics, commissioning, Configuration, lower range value, LRV, radar level, span, span calibration, ultrasonic level, upper range value, URV, zero calibration