Why Does Chemical Injection Pump Stop on Low and High Conductivity?

I expect those two conditions are considered to be failure modes, possibly a short and open circuit condition. Defeating any equipment protection system instead of repairing the failure usually results in more damage to the system than the original failure.

This sounds like a classic ESO situation.

https://www.acronymfinder.com/ESO.html

Ask the person who wrote the document.

The Original Poster could also read the outcome from the HazOp Study.

Yes they could. Had they cited a section that baffled them I'd gladly help. I choose to ignore demanding lazy people.

You could reprogram the low low setpoints to be the new low set point, but that seems contrary to the intent of the engineer who designed the system.

Stopping the pump on low low conductivity is done to prevent damage to the pump, it assumes that perhaps the pump has lost its feed, and running dry will damage it. The pump not running will likely produce an alarm, so that someone will go look at it.

The low low and high high setpoints are an indication that your dosing system is out of control, the pump probably should be running all the time, and some other variable such as pump speed, dilution, or valve opening is the primary conductivity control.

Be sure you understand your equipment before making changes, it seems from the question that perhaps you have left some details out.

There will be a set of switching contacts on the <...conductivity...> instrument that should ideally open on a deviation from normal. The Designer will wire those contacts into the circuit that connects power to the pump and the Commissioning Engineer will enter a set-point that opens them on <...low conductivity...>, thereby stopping the pump.

Simples ξ.

However, <...low conductivity...> is not a normal condition in <...cooling water...> systems, as it suggests that dissolved solids have been removed somewhere to create it; adding <...NaOH...>, or anything else for that matter, into the <...cooling water...> will cause it to increase, as will evaporation at a cooling tower. Removing dissolved solids can really only take place either by using the condensate from evaporation, or by using membrane technology like reverse osmosis, and there is no hint that either of these processes are taking place from the original post. As such it is highly unlikely that a <...low conductivity...> condition would occur. It is more likely, as suggested above, that the absence of liquid will be a more frequent occurrence, in which case a liquid presence detector, such as the electronic tuning-fork style instruments (manufacturers' names withheld), or even a simple low level switch in a feed tank will be a simpler approach.

The operation of evaporative <...cooling water...> systems is hazardous, requiring detailed attention to the circuit's chemistry so as to avoid fouling, both chemical and biological, and the development of legionella pneumophilia, and therefore is not for the untrained.

The warning sign below applies to any machinery as well as computers.

I think it is appropriate in this case.

ACHTUNG! ALLES LOOKENSPEEPERS!
Das computermachine ist nicht fuer gefingerpoken und mittengrabben. Ist easy schnappen der springenwerk, blowenfusen und poppencorken mit spitzensparken. Ist nicht fuer gewerken bei das dumpkopfen. Das rubbernecken sichtseeren keepen das cotten-pickenen hans in das pockets muss; relaxen und watchen das blinkenlichten.

It is not possible to control pH, for which <...NaOH...> is added, using a conductivity instrument.

It is not possible to control conductivity using <...NaOH...>.

Have you considered a process that uses acid to clean copper oxides from the insides of generator winding cooling passages?

Three times.