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2 Introduction
The 9112A Calibration Furnace was designed specifically for calibrating PRTs,
fiber optic sensors and thermocouples at higher temperature ranges up to
1100°C. The furnace utilizes an equilibration block capable of making compar
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ison measurements on multiple probes. The standard equilibration block is
sized for ¼ inch probes, however, custom options are possible. Temperature
stability is better than ± 0.1°C throughout the range and the gradient between
wells at full insertion is less than 0.5°C (± 0.25°C).
The temperature control system utilizes a digital controller with a Type K ther
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mocouple control sensor and RS-232 interface. The controller displays the set
temperature and the actual temperature simultaneously. The display shows tem
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perature to the nearest degree in °C or °F (shipped in °C). The temperature is
set with convenient up and down buttons on the front panel.
Sensors being calibrated as well as the furnace itself are protected from exces
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sive temperature with an over-temperature cutout. The cutout is easily adjusted
from the front panel. This device is relay operated and protects against the pos-
sibility of thermal runaway due to a shorted solid-state relay which controls the
heaters.
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2 Introduction