Automated Sensor Calibration System for Controlled Atmosphere Workstations
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Solution Overview
Problem
Conventional methods for calibrating oxygen sensors in controlled atmosphere workstations are prone to sensor damage, thermal shock, condensation, and human error, and disrupt the workstation's operation by requiring manual calibration or removal of the sensor.
Innovation Solution
An automated calibration system that allows in-situ calibration of gas sensors, using an enclosure mechanism and gas supply line controlled by automatic means to maintain the sensor's temperature and prevent atmosphere disruption, reducing operator intervention and risk of error.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oxygen sensor is removed from the workstation for calibration, then calibration can be performed, but the sensor is at risk of damage, thermal shock, and condensation
Solution Approach 1:
A calibration chamber is introduced as an intermediary environment between the controlled atmosphere and the sensor during calibration. The chamber allows calibration gases to be supplied to the sensor while maintaining a controlled environment that prevents thermal shock and condensation, enabling safe in-situ calibration without removing the sensor from the workstation.
Solution Approach 2:
The system enables self-calibration capability where the sensor can be calibrated while remaining installed in the workstation. The automated calibration process allows the sensor to service itself without removal, eliminating the risks associated with sensor handling and reinstallation while maintaining calibration accuracy.
2Measurement precision
If manual calibration is performed with operator arms inside the workstation, then calibration can be conducted, but the workstation size is restricted and human error increases
Solution Approach 1:
The manual mechanical operation of calibration by operator arms is replaced with an automated gas supply system. Gas cylinders with controlled delivery mechanisms automatically supply calibration gases to the sensor through the calibration chamber, eliminating the need for operator physical access and reducing human error while improving calibration precision.
3Reliability
If manual calibration procedures are followed, then calibration can be performed, but the process is complex and time-consuming
Solution Approach 1:
The calibration process is designed to be continuous and automated, with gas supply, chamber sealing, and sensor reading occurring in an uninterrupted sequence. The system maintains the calibration chamber sealed and continuously supplies appropriate gases until calibration is complete, eliminating the time losses associated with manual setup, adjustment, and verification steps.
Solution Approach 2:
The calibration chamber is pre-positioned and pre-sealed around the sensor before calibration begins. Gas supply lines are pre-attached to the chamber, and the automated system is pre-programmed with the calibration sequence, allowing the actual calibration to proceed quickly without manual preparation steps.
4Productivity
If the sensor is calibrated in-situ, then workstation operation is maintained, but the controlled atmosphere may be disrupted
Solution Approach 1:
The workstation internal volume is segmented into two separate zones: the main controlled atmosphere chamber and the calibration chamber. The calibration chamber is a isolated sub-volume that can be sealed around the sensor without affecting the broader controlled atmosphere. This segmentation allows calibration to proceed in isolation while the main workstation continues to maintain its controlled atmosphere undisturbed.
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
The automated system improves calibration accuracy and speed, minimizes sensor damage, and maintains the controlled atmosphere, allowing uninterrupted workstation operation while simplifying the calibration process.
Implementation Method 1
a gas supply line, operable by the automatic control means, for supplying gas into the calibration chamber to calibrate the sensing scale of the sensor
Implementation Method 2
the gas sensor may be an oxygen sensor to monitor the concentration of oxygen in the controlled atmosphere of the workstation
Data Source
AI summary
An automated sensor calibration system and method provide for calibrating a gas sensor in-situ in a controlled atmosphere workstation. The system comprises a controller for automatically controlling the calibration system; an enclosure member movable between a first position and a second position; and a drive mechanism, operable by the controller, for moving the enclosure member between the first position and the second position. In the first position, the enclosure member is arranged in a spaced relationship from the sensor such that a sensing head of the sensor is exposed to the controlled atmosphere of the workstation. In the second position, the enclosure member is arranged in engagement with at least one surface so as to define a calibration chamber and enclose the sensing head in the calibration chamber.