IN Brief:
- CHIPREG and FLATREG integrate flow sensing, control electronics, and proportional valve operation.
- Models support flows reaching 40l/min and operating pressures reaching 10 barg.
- Calibration, gas properties, contamination, pressure variation, and settling time govern installed performance.
IMI has expanded its range of compact mass-flow controllers for semiconductor processing, thin-film coating, analytical instruments, environmental chambers, medical systems, bioreactors, and industrial equipment.
The FAS CHIPREG MFC and FAS FLATREG MFC integrate a flow sensor, control electronics, and proportional valve within manifold-ready packages. Combining those functions reduces external tubing, fittings, leak paths, wiring, and the amount of engineering required around separate sensing and actuation components.
CHIPREG uses a body width below 22mm and supports flow ranges reaching 20l/min, with a turndown ratio of up to 1,000:1. FLATREG retains a 22mm form factor while extending flow capacity to 40l/min and operating pressure to 10 barg.
Response times can be specified down to approximately 100ms, while control and monitoring options include analogue signals and RS232 or RS485 communications using Modbus. The devices can therefore enter both conventional feedback loops and digitally supervised OEM platforms.
Within a mass-flow controller, the sensor measures the gas passing through the body and the electronics continuously adjust the proportional valve to maintain the commanded setpoint. Compensation for temperature and pressure allows the reported value to represent mass rather than uncorrected volumetric flow.
Integration becomes particularly useful where equipment contains several independently controlled gas lines. Semiconductor deposition, etching, and chamber-cleaning systems may rely on precise ratios between gases, while analytical instruments need stable carrier or sample flows to preserve repeatability.
Reducing internal volume can shorten the delay between a setpoint change and the resulting gas delivery because less fluid has to be displaced. Fewer external joints also reduce potential leak paths, simplify pressure testing, and allow multi-channel manifolds to occupy less space.
The quoted response time does not fully describe the behaviour of an installed gas system. Engineers must distinguish the initial movement of the valve from the time required for flow to settle within a defined error band, which is also affected by upstream volume, regulator dynamics, downstream restriction, supply pressure, and loop tuning.
Gas composition introduces another source of uncertainty because thermal mass-flow sensors respond to heat capacity and thermal conductivity. A controller calibrated for one gas may need a correction factor or separate calibration for another, and the remaining error may be unacceptable in tightly controlled processes.
Multi-gas capability can reduce inventory and simplify machine variants, although process qualification still needs to cover the actual gas, pressure, temperature, and flow range. Reactive, corrosive, or condensable gases also place stricter demands on wetted materials, sealing, purge behaviour, and contamination control.
Semiconductor manufacturing adds expectations around leak tightness, particle generation, dead volume, and material compatibility. A small delivery error repeated across thousands of wafers can alter film thickness, etch profile, chamber condition, or device yield.
Long-term drift has to be managed alongside initial accuracy. Sensor contamination, valve wear, pressure cycling, and changes in zero stability can shift delivered flow over time, so calibration intervals and in-situ verification need to form part of the maintenance strategy.
Digital communications provide more than remote setpoint control. Equipment can monitor valve demand, measured flow, diagnostic states, and calibration information, helping the host identify a restriction, supply-pressure problem, or controller operating close to its mechanical limit.
Those diagnostics must remain distinct from safety functions. A communications failure should move the valve to a defined state, while the host controller needs to distinguish a network interruption from a genuine process fault. Analogue fallback, local interlocks, or independent pressure monitoring may still be required.
Compact integrated controllers can shorten development by replacing several fluidic and electronic components with one characterised module, yet the engineering workload shifts towards calibration selection, system dynamics, communications, and lifecycle verification. Mechanical integration must also preserve service access without reintroducing excessive tubing or dead volume.
CHIPREG and FLATREG combine high turndown, compact manifold integration, and several control interfaces across a broad range of flow and pressure requirements. Their performance in production equipment will rest on repeatability, settling behaviour, gas compatibility, contamination control, and the ease with which calibration can be maintained throughout the machine’s service life.
