Mobile system for calibrating, verifying and/or adjusting a sensor and method for calibrating, verifying and/or adjusting a sensor
AssigneeEndress+Hauser Group Services AG
InventorBernhard Hellein
Life of this patent
Estimating the term…
Abstract
The present disclosure includes a mobile system for calibrating, verifying and/or adjusting a sensor, the mobile system having a valve unit, wherein by setting, in particular controlling, the valve unit, the process variable present at a calibration site can be set, in particular controlled, to at least one specifiable reference value for the process variable. The present disclosure further includes a method for calibrating, verifying and/or adjusting a sensor by means of the mobile system.
Claims12
A mobile system for calibrating, verifying and/or adjusting a conductivity sensor configured to determine a conductance of a process medium, the mobile system comprising:
- a conveying circuit configured to convey a calibration liquid, the conveying circuit comprising:
- a fluid line including a first section and a second section;
- a bypass fluid line, which is connected to the fluid line via a first connection point and a second connection point, as to bypass the first section of the fluid line;
- a filter unit disposed in the bypass fluid line and configured to perform a continuous desalination of a portion of the calibration liquid conveyed through the bypass fluid line;
- a pump disposed in the fluid line and configured to pump the calibration liquid in a conveying direction through the fluid line and the bypass fluid line simultaneously, wherein the second section of the fluid line is downstream of the second connection point with respect to the conveying direction, and the first section is upstream thereof;
- an adjustable valve, wherein the adjustable valve is operable to set a ratio of the portion of the calibration liquid conveyed through the bypass fluid line, which is desalinated by the filter unit, to a portion of the calibration liquid conveyed through the first section of the fluid line;
- a calibration site enabling the conductivity sensor and a reference conductivity sensor to be introduced into the conveying circuit,
- wherein either the calibration site is located within the second section of the fluid line or the calibration site, including an interchangeable fitting, is introduced into the conveying circuit via connections disposed in the second section of the fluid line,
- wherein the adjustable valve includes an adjustable controller configured to control the adjustable valve such that the conductance of the calibration liquid at the calibration site has selectable specified reference values.
A method for calibrating, verifying and/or adjusting a conductivity sensor, the method comprising:
- pumping a calibration liquid in a conveying direction simultaneously through a fluid line and a bypass fluid line, which bypasses a first section of the fluid line to a calibration site;
- continuously desalinating the calibration liquid conveyed through the bypass fluid line;
- setting a ratio of a portion of the calibration liquid conveyed through the bypass fluid line to a portion of the calibration liquid conveyed through the first section of the fluid line;
- introducing the conductivity sensor and a reference conductivity sensor into the calibration site;
- and
- setting the ratio such that a conductance of the calibration liquid at the calibration site has at least one specified reference value.
Dependencies are inferred from the claim text.