Dual-Chamber Measuring Cell for In-Place Reference Calibration

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Solution Overview

Problem

Existing measuring devices require calibration measurements that depend on the medium present in the measurement chamber, necessitating the chamber to be emptied or filled with a reference medium, which is inconvenient and disruptive, especially in applications requiring hygienic handling and cost-effective disposability.

Innovation Solution

A measuring device with a separate reference chamber allows for calibration and measurement checks without disturbing the medium in the measurement chamber, enabling simple repositioning of the measuring cell between measurement and reference positions without disassembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If calibration measurements are performed using the measurement chamber, then calibration can be carried out, but the measurements depend on the medium present in the chamber requiring emptying or filling with reference medium

Engineering Contradiction:

Improvecalibration operationVSAvoidtime for medium exchange

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The measuring cell is divided into two separate chambers: a measurement chamber for holding the process medium and a reference chamber for holding reference medium. This segmentation allows calibration measurements to be performed independently in the reference chamber without requiring any exchange of the process medium in the measurement chamber, thereby eliminating time loss and operational disruption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The reference chamber acts as an intermediary that provides a stable reference environment for calibration measurements. By using the reference chamber as a separate calibration environment, the system avoids the need to disturb the process medium in the measurement chamber, enabling continuous process monitoring without interruption.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a stainless steel flow cell block is used, then durability and reusability are improved, but manufacturing costs and assembly complexity increase

Engineering Contradiction:

Improveflow cell durabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention employs disposable plastic flow cells instead of expensive stainless steel flow cell blocks. These disposable flow cells are pre-filled with reference medium and can be easily replaced when needed. This approach significantly reduces manufacturing costs and simplifies assembly while maintaining reliability through the disposable nature of the components, eliminating the need for complex cleaning and sterilization procedures.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The system combines disposable plastic flow cells with a reusable housing structure. The plastic flow cells provide a cost-effective, disposable measurement and reference chamber assembly, while the reusable housing contains the optical components and electronics. This composite approach balances durability with cost-effectiveness.

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Enables independent calibration and measurement validation without medium exchange, ensuring accurate and efficient operation with minimal disruption and reduced manufacturing costs.

Implementation Method 1

sensors for measuring a spectral absorption coefficient or a concentration of an analyte in the medium

Methodology Applied

Scientific EffectAbsorption: Absorption (EM radiation)

Implementation Method 2

Depending upon the type of sensor and/or the interaction with the medium used to measure the measurand, such as absorption, reflection, scattering, or fluorescence

Methodology Applied

Scientific EffectScattering: Scattering

Implementation Method 3

transmitted radiation is transmitted into the measurement chamber through a window... detector receives measuring radiation resulting from an interaction of the transmitted radiation along an optical path running through the medium

Methodology Applied

Scientific EffectAbsorption: Absorption (EM radiation)

Data Source

PatentUS12480885B2Measuring device for measuring at least one measurand of a medium

Publication Date: 2025.11.25 ENDRESS HAUSER CONDUCTA GMBH CO KG

AI summary

A measuring device for measuring a measurand of a medium includes a measuring cell, a measuring cell receptacle for holding the measuring cell, and a measuring apparatus for measuring the measurand, wherein the measuring cell includes a measurement chamber containing the medium and a reference chamber separate from the measurement chamber and containing a reference medium. The measurement chamber and the reference chamber are arranged relative to one another such that the measuring cell can be inserted into the measuring cell receptacle in a measuring position, in which measurements of the measurand of the medium can be performed by means of the measuring apparatus, and can be inserted into the measuring cell receptacle in a reference position, in which reference measurements of a reference variable of the reference medium in the reference chamber can be performed by means of the measuring apparatus.