The control system is what makes a dosing system hold target as flow and influent quality change — and what keeps it safe when something fails. We design the instrumentation, control loops, interlocks and SCADA integration as part of every dosing system we build: the right analysers, the right control mode, fail-safe logic, and a panel that an operator can actually run.
Instrumentation, loops, interlocks and integration — designed together.
A dosing control design is more than picking a controller. It is choosing and placing the analysers, selecting the control mode for the process dynamics, writing the interlocks that keep the system fail-safe, building the panel, and integrating it into the wider plant SCADA. We design all of it against the duty so the loop holds setpoint across the full flow range and degrades safely if an instrument fails.
Flow meter for pacing; pH/ORP/residual/turbidity analyser placed after the contact zone. Sensor choice on control strategy.
Feed-forward, feedback or compound loop selected from process dead-time and dynamics — maths on rate & control.
No-flow inhibit, low-level cut-out, bounded output, leak detection — fail-safe by design.
Local PLC loops under plant SCADA for setpoints, trending and alarms.
Fast local loops under coordinated supervision.
Deterministic PID loops at 100–500 ms scan — pump speed/stroke control, analyser input, interlocks. The dosing happens here.
Setpoints, mode switching (auto/manual/cascade), alarms, trending and operator visualisation.
Consumption, £/m³ dosing cost and compliance reporting — tie to dosing ROI.
| Interlock | Prevents |
|---|---|
| No-flow dosing inhibit | Dosing into a stopped stream |
| Low-level cut-out | Running a pump dry |
| Bounded control output | Runaway dose on analyser failure |
| Analyser-fail fallback | Loss of control — revert to last-good feed-forward |
| Leak / bund alarm | Undetected chemical release |
| Duty/standby changeover | Loss of dosing on pump fault |
Every instrument, loop, interlock and mode documented — the basis of build and commissioning.
Instrumentation and control topology on the system P&ID.
Control panel assembled, programmed and factory-tested with the dosing system.
Analyser calibrated, PID tuned on live data, alarms proven, operators trained.
We engineer instrumentation, control loops, interlocks and SCADA integration as one with the dosing equipment — so the system holds setpoint, fails safe, and is straightforward to operate.
Our expertise spans multiple industries with sector-specific water treatment solutions.