High-temperature calibration bath 875

fluidized bedhigh-precision

Overview
The fluidized-bed calibration bath 875 enables comparison and Fixed Point calibrations from 50°C to 700°C with very high stability (±0.005°C at 150°C and 450°C) and excellent homogeneity.

Benefits

• Wide temperature range with high precision
• Sealed design prevents powder escape in the laboratory
• Suitable for comparison calibrations and Fixed Point methods

Detailed description
The 875 fluidized-bed calibration bath outperforms salt baths across key criteria: broader temperature range, improved safety, and lower uncertainties. It uniquely covers a very wide temperature span without changing thermal media.
The system consists of an aluminium oxide powder container with a porous base. Controlled airflow through the base plate fluidizes the powder so it behaves like a liquid, providing optimal heat transfer characteristics.

Specifications – Range and performance
Temperature range: 50°C to 700°C
Volume: Diameter: 67 mm
Useful depth: 475 mm
Absolute stability (within 875/09 equalizing block after 10 minutes): ±0.005°C at 150°C
±0.005°C at 450°C
±0.020°C at 660°C
Vertical uniformity: ±0.005°C at 350°C
±0.005°C at 420°C
±0.026°C at 660°C
Heating time: From 50°C to 700°C: < 240 minutes
Compressed air supply: 1 bar, 30 L/min at 100°C (50 L/min max)

General specifications
External dimensions L x W x H: 580 x 640 x 1570 mm (880 mm to top of panel)
Mass: 85 kg including 22 kg aluminium oxide powder
Power supply: 208 / 240 V (50/60 Hz), 3 kW (3 x 1 kW)

Instrument – delivered as standard

• Aluminium oxide powder
• Calibration tube 875/02
• Cal Notepad software
• Serial communication cable
• Operating manual

Available accessories

• 875/01: Equalizing block and connection tubes
• 875/03: Compressor and connection tube
• 875/04: Aluminium oxide powder, 25 kg
• 875/06: Support for glass thermometer
• 875/07: Probe support
• 875/08: Monocular and holder (for reading glass thermometers)
• 875/09: Adjustable-height equalizing block
• 875-02-08: Replacement ceramic filter

Transport information
External dimensions L x W x H: 580 x 640 x 1570 mm
Mass: 85 kg (including 22 kg aluminium oxide powder)

Characteristics / technical specifications

• Model: 875
• Temperature range: 50°C to 700°C
• Calibration tube diameter: 67 mm
• Useful depth: 475 mm
• Stability (e.g. after 10 min): ±0.005°C (150°C and 450°C), ±0.020°C (660°C)
• Vertical uniformity: up to ±0.005°C (350–420°C)
• Heating time 50→700°C: < 240 minutes
• Required air supply: 1 bar, 30 L/min at 100°C (50 L/min max)
• External dimensions: 580 x 640 x 1570 mm
• Total mass: 85 kg (22 kg aluminium oxide powder)
• Power supply: 208/240 V 50/60 Hz, power 3 kW (3 x 1 kW)