Sensor Unit Software Module Transmission for pH Calibration
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Solution Overview
Problem
Current methods for determining the calibration and maintenance needs of pH sensors are complex and impractical due to varying conditions at different measuring points, requiring comprehensive models that are difficult to implement with limited memory and power in sensor units, especially in pH measuring points with inductive interfaces.
Innovation Solution
A method involving the transmission and storage of software modules on the sensor unit for monitoring the primary sensor, enabling prognosis of calibration times and maintenance measures based on specific conditions, with the base unit checking and updating software modules as needed to ensure compatibility and up-to-dateness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If comprehensive models are implemented in sensor units to determine calibration and maintenance needs, then measurement precision and reliability improve, but device complexity and memory requirements increase beyond what is practical for sensor units with limited resources
Solution Approach 1:
The system divides the complex calibration and maintenance determination into two segments: a comprehensive model running on a powerful base unit that generates calibration recommendations, and a simpler software module stored in the sensor unit's program memory that executes the calibration routine. This segmentation allows the complex computational work to be performed where resources are available while keeping the sensor unit simple.
Solution Approach 2:
A software module acts as an intermediary between the comprehensive calibration model and the sensor unit's limited resources. The base unit transmits this software module to the sensor unit, where it enables additional monitoring functions and calibration routines without requiring the sensor unit to contain the full complex model itself.
2Adaptability or versatility
If software modules are transmitted and stored in the sensor unit's program memory, then adaptability to specific measuring points improves, but memory capacity is consumed
Solution Approach 1:
The software module serves multiple functions within the sensor unit: it monitors the primary sensor, enables calibration routines, provides diagnostics, and adapts the sensor to specific measuring point conditions. By consolidating these multiple functions into a single transmitted software module, the system achieves high adaptability without proportionally increasing memory requirements.
3Reliability
If the base unit checks and updates software modules to ensure compatibility, then reliability and compatibility are improved, but communication time and energy consumption increase
Solution Approach 1:
The base unit performs preliminary checks of the transmitted software module for compatibility with the sensor unit before actual transmission and installation. This preliminary validation ensures that compatibility verification is done in advance, reducing the time required during actual sensor operation and minimizing interruptions to measurement activities.
Data Source
Figure 1~2
AI summary
A method for operating a measuring point (1, 2, 3) having a base unit (11, 12, 13) and a sensor unit (21, 22, 23), said sensor unit being coupled to the base unit via a plug connector coupling; the base unit being used for power supply of the sensor unit, for data exchange with the sensor unit, and for communication with a process monitoring facility, said base unit comprising: a first element, which has a first microprocessor for sensor data preparation for communication to the process monitoring facility (30, 31); a first data memory for storing data specific to the measuring point; said sensor unit having a primary sensor and a sensor head; the primary sensor comprising a converter which outputs a signal as a function of a measured variable; said sensor head comprising: a circuit for preparing the converter signals using an A/D converter and a second microprocessor for measurement signal processing, a second data memory for sensor data; a program memory, which contains firmware; and an interface having a second element of the plug connector coupling; a software module, which allows supplementary functions to the primary sensor monitoring, being transmitted from said base unit to said sensor unit and being stored in said program memory of said sensor unit.