What is ProMix?
Conventional systems inject sterilizing agents or flocculants using fixed-volume or simple proportional control. However, fluctuating raw water quality and pump conditions constantly alter the actual chemical demand, exceeding the capabilities of traditional fixed or single-variable injection setups.
Tohkemy’s ProMix system overcomes these limitations by integrating secondary control triggers—such as turbidity—alongside primary flow metrics. This multi-variable strategy enables precise, dynamic chemical dosing that adapts continuously to real-time water conditions.
Excellent operability with touch panel type

Uses a 5.7-inch touch panel LCD for intuitive operation and confirmation
Automatic calculation control of required chemical injection amount from raw water flow rate and water quality concentration
Flow rate proportional
Flow rate proportional + feed forward
Combines flow-proportional pacing with feedback control (P or PID).
Flow rate proportional + linearize
You can select from the above four types of control methods, and optimal control is possible for your application.
Supports remote input of control target values
Even if the target value changes due to process steps, etc., the target value can be changed with the 4-20mA DC analog signal on the upper board.
Application example
PAC chemical injection control for filtration of river water and shallow wells
Control of pH regulator drug injection for applications with large flow rate fluctuations
Hypochlorite injection control for large applications with variable flow rates

Flow rate proportional + feed forward or PID feedback (type E)

<Flow rate proportional + feed forward>
The water quality is measured before the chemical injection point, _and the difference from the target value is the chemical injection.
Example) If the water quality concentration in the previous stage is 0.3 mg / L _and the target value is 0.5 mg / L, perform drug injection at 0.2 mg / L (× correction coefficient).<Flow rate proportional + PID feedback>
The water quality is measured after the drug injection point, _and the drug injection rate is controlled to approach the target value while changing it by proportional control or PID control compared to the target value.
Linearize control (type D)
<Linearize control>
An injection method that changes the injection rate in a line graph rather than simply changing the injection rate proportionally according to the water quality value.

* Two pumps cannot be installed on the TXS-25 type.