FT25 Scraped Surface Heat Exchanger Series


FT25 Scraped Surface Heat Exchanger Series

Armfield miniature-scale technology is well established at offering developers the opportunity to run small trials, which provide enough information to enable scale-up to larger plant with confidence. The formulations go through similar physico-chemical changes as they would in production plant and real time data logging permits results to be recorded and repeated. The FT25 range of miniature-scale scraped surface heat exchangers has built-in control and flexibility with a graphic representation of the process on the touch screen control panel. The operator can choose the parameters wanted for any particular formulation. The FT25 has a number of configurations according to the required use.


The FT25 Scraped Surface Heat Exchanger Series utilises the Armfield monocoque stainless steel cabinet with HIMI touch screen.

The working platform can accommodate one or two barrels (B) and a variable speed pinworker (P) alongside a progressive cavity feed pump (C). The unit housed in a Stainless Steel (304) uses a refrigeration system supplied within the cabinet and utilises a chilled, food grade refrigerant, which is pumped through the barrel jackets. An air incorporation system can also be added if required.

Small batch sizes enable rapid product testing.

Enhanced CIP facility available.

Technical Specifications

Heat Exchanger Barrel

Heat transfer area: 0.045m²

Shaft/barrel volume ratio: 1 : 3.5

Scraper blades: 4 along shaft stainless steel, 180° separation

Barrel length: 0.35m

Barrel working pressure: 20.0 bar


No of pins on shaft: 20

No of pins on barrel: 42

Barrel/pinworker drives

Variable speed ac motors, inverter controlled

Speed range: 0-1400rpm

Refrigeration system

Food grade refrigerant: -25°C capability

Feed pumps

Progressive cavity pump

Process throughput: 0-20l/h, independent of back pressure

Particulate capability: up to 0.6mm

Fibre handling capability: up to 25mm

Air incorporation system: Air pump with multiple turn control valve and dial to vary overrun

NOTE: Air incorporation systems use a suction inlet  and are not fitted with an inlet tank.

Features & Benefits

  • Duplicates full-scale process
  •  Fast, accurate new product development
  •  All process parameters under operator control for maximum flexibility
  •  Rugged and reliable units
  •  Only requires electricity and water to function
  •  Full control of barrel speeds to over 1000rpm
  • Temperature control system incorporated
  •  Integral control panel enabling simple control and monitoring of all major variables
  •  Enclosed self-contained, mobile, stainless steel service cabinet for easy cleaning and wash down with removable panels
  •  Hard chromed barrels
  •  Hygienic design
  • Made from 316 stainless steel
  • In cabinet refrigeration


  • Variable speed pinworker for margarine and soft spreads
  •  Air incorporation system
  •  Computer data logging facility
  •  Pinworker

Control Panel

The splashproof, full colour touch sensitive screen with diagrammatic representation of the process. It shows variables such as product feed pump rate, barrel and pinworker speed, temperature and pressure, which are all under operator control. Process data is displayed in real time and can be logged to a PC running the Windows™ operating system. Note: For Scraped surface heat exchanger applications involving product heating, UHT, or combined heating and cooling, please enquire about our FT174X – Modular Miniature HTST/UHT Process System.


You need to be registered to download this. Click here to continue.

Windows™ Data Capture Software

A unique benefit of the Armfield miniature-scale food processing range is that the measured data may be captured and stored to disk. An Armfield FT25-DTA-ALITE Data Logging Accessory transfers results to a computer. Feed pump flow rate, barrel/pinworker speeds, temperatures and pressures can be monitored in realtime. The data can be displayed in graphical and tabular forms and printed. A computer with a USB port, and running Windows XP or later is required.

Continuous Margarine Crystalliser

FT25BP-IF-C: One barrel and one pinworker

FT25BBP-IF-C: Two barrels and one pinworker A resting tube for product settling and food grade refrigeration unit for process cooling are supplied. A range of oil emulsions can be processed.

Continuous Ice Cream Freezer

FT25BA-IF-C: One barrel Air incorporation via a small air compressor and refrigeration. Overrun can be achieved up to 300% (dependant on product). Combined Ice Cream and Margarine System

FT25BBPA-IF-C: Two barrels, one pinworker plus air incorporation.

Data Logging Accessory: FT25-DTA-ALITE

Electricity supply: (see ordering codes)

Water supply: For refrigeration cooling Cooling water supply with flow rate of 3l/min @ 3bar and ≤20°C

Packed and created shipping specifications

Volume: 2.1m3

FT20-20: 380Kg

Length: 0.78m

Width: 0.65m

Height: 2.6m

FT25BA/BP/BBP/BBPA-A 220-240v 1ph 50Hz

FT25BA/BP/BBP/BBPA-G 220-240v 1ph 60Hz

Armfield Updates

Subscribe to our occasional newsletter for the latest product updates from Armfield Engineering.