R800 Series Standard Platinum Resistance Thermometers

The R800 series standard platinum resistance thermometers conforming to the International Temperature Scale, 1990 (ITS-90) have been commercialized under the guidance of the National Research Laboratory of Metrology.

　
Specification Sheet

Features

  • The thermometers cover from vapor point of helium to freezing point of silver.
  • Various models are prepared for low temperature and high temperature.
  • Fixed point calibration and precision comparison calibration are available.

Models

Models

Types

R800-0 Standard platinum resistance thermometer for low temperature
R800-2 Standard platinum resistance thermometer for medium temperature
R800-3 Standard platinum resistance thermometer for high temperature
R800-3T Low resistance type standard platinum resistance thermometer for high temperature
R800-4 Platinum-Cobalt resistance thermometer for cryogenic temperature

Specifications

Model R800-0 R800-2 R800-3 R800-3T R800-4
Measuring range 13K to 30°C 73K to 661°C 0°C to 962°C 4K to 0°C
Resistance value
(at 0°C)		 25.5Ω±1Ω 2.55Ω±0.1Ω 0.25Ω± 0.01Ω 100Ω± 4Ω
Measuring current 1mA 10mA 1mA
Temperature characteristic R(-38.8344°C)/
R(0.01°C)
≧0.844235		 R(29.7646°C)/
R(0.01°C)
≧0.844235		 R(29.7646°C)/R(0.01°C)
≧1.11807
and
R(961.78°C)/R(0.01°C)
≧4.2844		 —
Sensitivity 0.1Ω/K 0.01Ω/K 1mΩ/K Min. 0.09Ω/K
(at 12K)
Max. 0.40Ω/K
Sealed gas Helium gas Mixture gas (argon and oxygen) Helium gas
Connecting lead wire 4-conductor type platinum wire
Φ0.3mm x 35mm		 4-conductor type cabtyre cord 2m with gold plated 4-conductor type platinum wire
Φ0.3mm x 35mm
Frame Cross quartz Cross quartz
Protection tube Capsule type platinum sheath
Φ5mm x 43mm		 Delustered quartz tube
(Φ7.0 ± 0.5mm) x 600mm		 Delustered quartz tube
(Φ7.0 ± 0.5mm) x 700mm		 Capsule type platinum sheath
Φ5mm x 43mm

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