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Model-875

Fluidised Furnace Model 875

The Isotech Model 875 Fluidised Calibration Bath is a high-precision solution for thermometer calibration across a broad temperature range. It outperforms traditional salt baths by offering safer operation, excellent thermal stability, and reduced maintenance. Developed over more than 20 years of research into powder flow, fluidisation, and filtration, the 875 is trusted by national laboratories, ISO 17025 accredited facilities, and demanding industrial users. It is particularly well suited for

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Fluidised Furnace Model 875

Features

  • Wide Temperature Range, High Accuracy
  • Safe, sealed no powder loss into laboratory
  • Comparison Calibration or use with Fixed Points
Fluidised Furnace Model 875

Description

Designed to deliver consistent and repeatable results, the 875 excels in comparison calibration. Its fluidised powder medium provides exceptional temperature uniformity and thermal contact—without the risks associated with corrosive salt media.

A key advantage of the Model 875 is its deep immersion capability of up to 475 mm—significantly more than dry block calibrators. This reduces stem conduction errors which is critical for high-accuracy calibration. In our own ISO 17025 accredited laboratory, we use the 875 for comparison calibration of Platinum Resistance thermometers from 300°C to 700°C, achieving uncertainties as low as ±0.020°C at 300°C and ±0.035°C at 660°C.

The system uses high-purity aluminium oxide powder, fluidised by compressed air passing through a porous base plate. This creates a uniform, stable medium with excellent heat transfer properties. Unlike many fluidised baths that rely on metal blocks or collapsing the bed to improve stability, the 875 delivers full thermal performance with the powder in flow.

Fluidised Furnace Model 875

Specifications

Model875
Temperature Range50°C to 700°C
Volume (875/02)67mm diameter, 475mm deep
Comparison (Ratio) Stability:±0.005°C at 150°C
In Equalising Block:±0.005°C at 450°C
(10 minutes)±0.020°C at 660°C
Heating Time50°C to 700°C < 240 minutes
Compressed Air Supply1 BAR, 30 litres/minute at 100°C (50L max)
CommunicationsIncludes serial interface, PC cable and software
DimensionsWidth 580mm, Depth 460mm, Height 1570mm, (880mm to top panel)
Weight85kg (including 22kg of Alumina powder)
SafetyCompliant to CE Regulations
Power3kW (3 x 1kW heaters) 208-240V, 50/60Hz
How to orderModel 875 Fluidised Calibration Bath

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