Product Overview
The Parker FCS-G1/4A4-ARX/D118 is a precision inline flow sensor engineered for continuous monitoring of hydraulic and industrial fluid systems. Operating on the proven calorimetric (thermal differential) measuring principle, this sensor detects flow velocity by evaluating heat dissipation from a heated sensing element immersed in the medium. The FCS-G1/4A4-ARX/D118 features a G1/4 threaded process connection and a 0.3-meter integrated cable lead, making it a compact, direct-install solution for flow verification, pump protection, and system diagnostics. As part of Parker’s FCS series flow monitoring instrumentation, it delivers reliable switching signals proportional to flow presence or absence, safeguarding critical machinery against dry-run conditions, line blockages, and unexpected flow loss.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Flow Sensor (Calorimetric / Thermal Differential) |
| Model Designation | FCS-G1/4A4-ARX/D118 |
| Process Connection | G1/4 (BSPP) Threaded |
| Cable Length | 0.3 m Integrated Lead |
| Operating Pressure | Standard Industrial Grade (Up to rated bar) |
| Mounting & Connection | Standard ISO / Manufacturer Interface |
Engineering Features & Advantages
- Precision Performance: Calorimetric sensing element provides accurate, repeatable detection of flow velocity with fast response to changes in flow condition, enabling reliable switching at user-defined setpoints.
- Industrial Reliability: Built for continuous operation under severe industrial conditions, with a robust stainless steel wetted body and sealed cable exit resistant to vibration, moisture, and common hydraulic media.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original OEM standards, including G1/4 thread and 0.3 m cable configuration for drop-in installation without adapters.
- Compact Inline Design: Minimal pressure drop and small installation footprint allow integration into tight manifold and pipework assemblies.
Typical Industrial Applications
Ideally suited for flow verification and protection duties in hydraulic power units, lubrication circuits, and cooling loops. Common deployments include plastic injection molding machines (mold cooling and hydraulic supply monitoring), metallurgical presses and rolling mills (lube and coolant flow assurance), CNC machine tools (spindle and slideway lubrication control), and construction or marine hydraulic systems where loss of flow must trigger immediate alarm or shutdown. Also used in process cooling skids, test benches, and pump dry-run protection circuits.
PRODUCT IMAGES


Parker FCS-G1/4A4-ARX/D118 0.3M Flow Sensor
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- Authentic & Fully Tested: 100% bench tested for hydraulic response, pressure rating, and null-bias stability before dispatch.
- Fast Dispatch: In-stock units ready for same-day dispatch via DHL / FedEx Express directly to your plant.
- Pre-Shipment Verification: High-definition photos, video testing runs, and serial number verification provided prior to shipment.
- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine Parker FCS-G1/4A4-ARX/D118 0.3M Flow Control Valve. This Germany-made hydraulic component features a pressure-compensated design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.