Products
View some of our proven products from leading manufacturers, selected to deliver reliable solutions and supported across the UK.
The FS10i Flow Switch / Monitor is a versatile, programmable thermal flow instrument designed for reliable flow monitoring across a wide range of gas and liquid applications. Suitable for use in everything from compressed air systems and lube oil circuits to HVAC ducts and process lines, it provides both switching and visual indication of flow conditions.
The FS10i features a fully programmable interface, allowing users to configure trip points and operating parameters via PC or laptop. Its integrated LED display array provides a clear, real-time visual indication of flow range, with flashing alerts when set points are reached, enabling quick and easy on-site monitoring.
Designed for flexibility, the FS10i is suitable for pipe sizes from ¼″ to 12″, with multiple sensor lengths and insertion options available to suit different installation requirements. The sensor can be installed using a compression fitting, allowing live insertion and removal through a ball valve, helping reduce downtime during maintenance or adjustment.
With no moving parts, the FS10i offers long-term reliability and low maintenance requirements. It is also available with ATEX certification and SIL2 compliance, making it suitable for hazardous areas and safety-related applications where dependable performance is essential.
- Programmable thermal flow switch and monitor for gas and liquid applications
- Suitable for compressed air, lube oil, HVAC and process systems
- Pipe size range from ¼″ to 12″
- Fully configurable via PC or laptop
- Integrated LED array for real-time flow indication
- Visual alarm indication when trip point is reached
- Live insertion and removal via compression fitting
- No moving parts for reliable, low-maintenance operation
- 316 stainless steel wetted parts
- ATEX certified and SIL2 compliant (90% SFF)
- Relay and analogue output options available
- Multiple sensor lengths and installation configurations
Over 45 Years in Operation
1000's of UK Installations
Supporting 100's of UK Sites
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Full Service UK Solutions
Allison Engineering supports projects from early-stage selection through to supply, commissioning and long-term support. For customers, that means not just choosing a product, but getting the right solution for the application.
Specifications & Planning
Application review, technical consultation, product selection and system planning based on type, process conditions and installation requirements.

Supply & Commissioning
Product supply, installation guidance, commissioning and full support services to get your process instrumentation working correctly in the field.
Support & Optimisation
Teams providing calibrations, servicing, maintenance, training and ongoing support to keep systems performing accurately and reliably over time.

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