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Surface Measurement System, Model 944
Isotech model 944 True Surface Measurement System

Product Code: 944
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Surface Measurement System

True Surface Temperature Measurement System "Isotech 944"

Indicates True Surface Temperature
30°C to 350°C
Resolution 0.1°C

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 y the hot plate is not necessarily the temperature at the point of measurement.

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 inventors 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 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 True Surface Temperature Measurement System
Temperature Range 30°C to 350°C
Resolution of display 0.1°C or 0.1°F
Stability ±1°C
Accuracy ±2°C with TRACEABLE Certification
±5°C without Certification
Probe Assembly Probe Diameter 7.5mm
Probe Length 150mm
Lead Length 850mm
Power Supply 100V - 120V, 50/60Hz or
200V - 240V, 50/60Hz
Dimensions H 90mm
W 153mm
D 256mm (excluding plugs)
Weight 4 kg
Please state supply voltage required
Please state is Calibration is required

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