Products
View some of our proven products from leading manufacturers, selected to deliver reliable solutions and supported across the UK.
The FLT93B Flow Switch is a cost-effective, general-purpose thermal flow switch designed for reliable flow and no-flow detection in both liquid and gas applications. Available ex-stock, it provides a practical solution where dependable switching performance is required without the need for complex configuration.
Using thermal dispersion technology, the FLT93B offers reliable operation with no moving parts, helping reduce maintenance requirements and improve long-term durability in industrial environments. It is commonly used for applications such as pump protection, fan failure detection and basic process monitoring, where simple and dependable flow indication is essential.
The switch features a compact and robust design with 316 stainless steel wetted parts, making it suitable for a wide range of industrial duties. With fully adjustable alarm set points, users can tailor the switching response to suit their application requirements.
The FLT93B is also available with ATEX certification and SIL2 rating, making it suitable for hazardous areas and safety-related applications where a cost-effective and readily available solution is required.
- Cost-effective thermal flow switch for general-purpose applications
- Suitable for liquid and gas flow detection
- Ideal for pump protection, fan failure and basic process monitoring
- Ex-stock availability for quick supply
- No moving parts for reduced maintenance and reliability
- 316 stainless steel wetted parts
- Fully adjustable alarm set points
- ATEX certified and SIL2 rated options available
- Process temperatures up to +175°C
- Fixed 3/4” NPT (male) process connection
- Sensor lengths available in 1.2”, 2” and 4”
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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