Errors resulting from cracked glass electrodes.

A tiny crack in the membrane of a glass electrode is not always visible to the naked eye. Frequent shocks may create cracks in the glass that cause measurment errors. These cracks will cause the analyzer to read 0 mV and the analyzer interprets that to a reading near pH 7. in many process the setpoint is near pH 7. This means a cracked pH sensor can cause an inaccurate reading that is near the setpoint, and it may not be noticed quickly. This can be a critical and dangerous situation.   Without additional diagnostic, the error will not be detected until the process is out of control.

Yokogawa's Transmitters have an impedeance check function. The analyzer checks the impedance of pH (and reference) sensors via the solution ground. The Transmitter can be set to generate an alarm if the impedance limits are exceeded. 

Related Products & Solutions

Liquid Analyzers

Liquid analyzers are used for monitoring process chemistry including water quality, providing process optimization and control.

pH and ORP Analyzers

pH and ORP meters, analyzers and transmitters are used for continuous process monitoring of pH and ORP to ensure water/product quality, monitor effluent discharge, batch neutralization, pulp stock, scrubbers, cooling towers, chemical, water/wastewater treatment and many other applications.

pH and ORP Sensors

pH electrodes and sensors are the sensing portions of a pH measurement. Various installation options including retractable, flow thru, immersion, and direct insertion. Proper pH electrode/sensor selection is critical for optimal measurement results.

Process Analyzers

Process analyzers are used to determine the chemical composition or physical properties of substances involved in industrial processes.

Top