Controller — Caustics/Bases
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LibertyCES has documented Controller in Caustics/Bases service, including Sodium Hydroxide. Documented models include GF Signet panel-mount controller. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a free spec review.
Notes from the vendor documentation
Explicit regulatorily-loaded setpoint: pH raised to 11.5 with NaOH before chlorine addition, with hard interlock against acid injection below pH 11.
Materials documented for this service
- N/A
Products cited for this service
Real Specifications
| Spec | Value | Source document |
|---|---|---|
| Cyanide destruction stage 1 pH setpoint | pH 11.5 (sodium hydroxide) | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Cyanide destruction stage 1 ORP setpoint | +450mV (chlorine addition target) | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Cyanide destruction post-neutralization pH target | pH 9.5 | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
| Cyanide destruction acid-injection interlock | Acid injection must be manually locked out below pH 11 | GF Piping Systems — Application Solutions Made Easy: Chemical Process Industry |
GF Signet's own safety warning: during the batch cyanide-destruction process, acid injection must be manually locked out to prevent pH dropping below pH 11 — dropping below that level does not allow the proper amount of oxidation to break cyanide down to cyanate, and the underlying chemistry makes this a real gas-release hazard, not just an efficiency loss.
Cyanide destruction is a two-target control loop, not a single pH setpoint: hold pH 11.5 with sodium hydroxide while chlorine drives ORP to +450mV, and the interlock exists because dropping below pH 11 doesn't just under-treat the cyanide — GF Signet's own literature ties it to a genuine gas-release hazard. A controller that can't hold both setpoints simultaneously, or lacks the acid-injection interlock, isn't a corner worth cutting on this chemistry.
Every material and product claim on this page traces to real, vendor-published documentation on file with LibertyCES. Chemical compatibility depends on exact concentration, temperature, and duty cycle — confirm current specifications with the manufacturer and request a spec review before final specification.
FAQ
Can Controller handle Caustics/Bases?
Explicit regulatorily-loaded setpoint: pH raised to 11.5 with NaOH before chlorine addition, with hard interlock against acid injection below pH 11.
What wetted materials should Controller use in Caustics/Bases service?
Materials documented for this service: N/A. Compatibility depends on exact concentration, temperature and duty cycle, so confirm with a spec review before final specification.
Which Caustics/Bases chemicals does this cover?
Named chemicals in this documentation: Sodium Hydroxide (cyanide destruction to pH 11.5).
Which Controller models are documented for Caustics/Bases?
Documented examples include GF Signet panel-mount controller.
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Reviewed by James Riggins, 30+ years specifying water and chemical process equipment · Updated