The overhead pH value control is an important procedure in the process of oil refining. The automatic control system of oil refining equipment overhead ammonia injection and pH value is a system under which a proper control model for the production process of oil refining equipment is established, distillation tower overhead ammonia injection can be automatically adjusted, the pH value of overhead gas line can be controlled within the expected range, and the equipment corrosion state can be real-time monitored by inductance probe corrosion monitoring technique, so as to improve the mathematical model which controls the overhead ammonia injection, make the production process more stable and realize effective corrosion control.

Technical Features
·High control precision
·Strong adaptability, good robustness
·Small overshoot

System diagram

Typical items
Injection automatic controller
Model：
·ZK5800（1:1 point to point）
·ZK5810（1:2 point to point）
·ZK5820（1:3 point to point）

Technical parameters：
·Resolution： 12-bit A/D converter
·Control accuracy：≤0.3pH
·Ambient temperature:0℃～50℃
·Relative humidity:≤85%
·Working voltage：220VAC

Frequency converter
Model: ZK5400 /ZK5410

Technical parameters
·Frequency range：0～50Hz
·Ambient temperature::-10℃～50℃；
·Relative humidity: ≤95%, Non-condensing
·Working voltage：380VAC