pH & Chemical Sensing Applications

pH Sensing

Example Solutions

ADC	Op Amp	Temp Sensor
ADC122S021	LMP7721 LM4140	LM35

• pH electrode measures hydrogen ion (H+) activity and produces a voltage
• Operating principle - electric potential develops when two liquids of different pH come into contact at opposite sides of a thin glass membrane
• Applications include water treatment, chemical processing, medical instrumentation, and environmental test systems

Chemical Sensing

Example Solutions

ADC	Op Amp
ADC122S021	LMP7721

• Electro-chemical sensors detect toxic gases
• Electro-chemical sensors are often used in portable equipment to detect different toxic gases (firemen, mining)
• Electro-chemical sensors produce an electrical current that proportional to the gas concentration.
• Interface circuitry (potentiostatic) maintains a constant voltage between the reference electrode and the working electrode. An electro-chemical reaction causes an output signal proportional to the WE current

• Data Conversion
  • Low power MSPS ADCs & DACs
• Amplifiers
  • Precision op amps
• Thermal Management (temps sensors, temp switches, hardware monitors)
• Power Management (including voltage references)