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Model-944

Model 944

The fundamental problem with surface temperature measurement is that it is subject to large stem conduction errors, also because heat conducted from the surface of the hot-plate causes a localised cold spot to be created which means that the temperature indicated by the hot plate is not necessarily the temperature at the point of measurement.

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Model 944

Features

  • Indicates True Surface Temperature
  • 30°C to 350°C
  • Resolution 0.1°C
Model 944

Description

An ideal system would not disturb the heat-flux from the hot-plate.

During 1993 such a system was described (ref. “Progress in Contact Thermometry” 1993 B. D. Foulis) and Isotech have the inventor’s permission to make and market the device World-wide.

Principal of Operation

A fine wire type N thermocouple is used as the surface temperature sensor, a second junction 2 to 3mm along the thermocouple, senses the temperature difference due to heat flux along the sensor.

A heater heats the thermocouple stem until the temperature gradient is zero, thus creating a measurement without stem conduction, or disturbance of the hot-plate’s surface.

The 944 can be used with the Isotech Small Hot Plate model 983. A traceable calibration certificate is available to order.

Model 944

Specifications

Model944 True Surface Temperature Measurement System
Temperature Range30°C to 350°C
Resolution of Display0.1°C or 0.1°F
Stability±0.1°C
Accuracy±2°C with TRACEABLE Certification ±5°C without Certification
Probe AssemblyProbe Diameter – 7.5mm Probe Length – 150mm Lead Length – 850mm
Power Supply100V – 120V, 50/60Hz or 200V – 240V, 50/60Hz
DimensionsHeight 90mm Width 153mm Depth 265mm (excluding plugs)
Weight4kg
How to orderModel 944 & Probe 935-14-81 Please state supply voltage required. Please state if Calibration is required.

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