Rosemount pH meter
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A new Rosemount 398-10-32-54-62 pH meter was installed, and after 3 days of use, no changes were detected in the measurements. Moreover, there is no change even when using a standard solution, and it cannot be calibrated – could there be a problem with the pH meter?
Is the medium selection appropriate? Is there an output of 4-20 milliamps?
Branded instruments cannot have functional errors. It might be that you installed it incorrectly. The correct way to install it is to place the probe at the bottom of the U-shaped bend, ensuring that the probe remains submerged in the fluid at all times. If installed on a horizontal pipe, the probe cannot be submerged in the liquid, causing the solution to dry up and damage the probe.
For online analyzers, it is important to select and install the appropriate model for one’s needs. If purchased from an agent, inaccurate product selection is the most common problem, as agents only aim to sell the cheapest options and ignore everything after that.
I heard from a senior colleague before that she has considerable on-site experience. Instruments like pH meters can easily get damaged when the liquid level fluctuates, and they may also be damaged in situations where the tank is dry. Their solution is to install the pH meter inside a bucket that is hung on the wall of the tank; this prevents the instrument from coming into contact with dry conditions and also protects the probe.
What is the measuring medium, and what is its conductivity? A flow cell is generally used. The medium is dirty; increase regular cleaning. Measure the reference resistance and measurement resistance of the lower probe