ABB Application Description - pH ORP Measurement. Amine Scrubbers in Foundry
Summary
Essential guide for mastering pH/ORP instrumentation in industrial amine scrubbers used by foundries. This manual provides critical technical insights for environmental managers needing to accurately measure scrubber efficiency and ensure compliance with national hazardous air pollutant standards (NESHAP). It details specialized measurement techniques required for high-accuracy sampling in strong acid solutions, addressing sensor non-linearity and advanced calibration protocols specific to foundry operations.
Page 1 Text Content
B M SU EM ENT & A LY TI S | PPLI ATI N DE SCR TI
p H/ORP measurement Amine scrubbers in foundries
Measurement made easy
Foundries amine scrubbers
Introduction The correct use of p H instrumentation to measure p H in foundry amine scrubbers is generally misunderstood. Environmental managers of iron and steel foundries must measure and record their amine scrubber p H values to ensure the scrubbers’ compliance with national standards for hazardous air pollutants (NESHAP).
To ensure that maximum achievable control technology (MACT) is attained by an amine foundry scrubber, it is very important to understand the difficulties of measuring p H in strong acid solutions and what accuracy may reasonably be expected. In addition, foundries that want to recycle spent-acid solutions rely on accurate p H readings to meet the physical properties imposed by the recyclers.
Page Summary Contents For ABB Application Description - pH ORP Measurement. Amine Scrubbers in Foundry
Manual Details
| Brand | Measurement |
|---|---|
| Pages | 4 |
| File Size | 1.15 MB |
| Published | June 03, 2026 |
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Frequently Asked Questions
How can I properly calibrate the pH sensor for amine scrubbers?
Calibrate using color-coded standard buffer solutions of 1.68 and 4.01 (red) pH buffers; let the sensor acclimate to higher pH values by soaking it in two fresh baths.
What is the expected accuracy when monitoring pH above 2.0?
It is unrealistic to expect the sensor reading to agree with a lab sample closer than 0.25 pH at concentrations above 2.0 pH.
How long does recovery take after exposure to strong acid?
If a sensor sits in strong acid, it can take hours to fully recover if moved to a buffer solution.
Why is accurate pH monitoring difficult in foundries?
The sensor exhibits non-linear behavior and significant 'acid error' when measuring low pH solutions (below 2.0).