ANNEALING FURNACE FOR SPRT THERMOMETERS

414 Annealing Furnace Temperature Calibrator. Temperature range from ambient to 1000ºC
Model 414 is designed to pre-warm and anneal Standard Platinum Resistance Thermometers
The Annealing Furnace Calibrator, model 414, is designed to heat, anneal and cool SPRT’s 
(Standard Platinum Resistance Thermometers) prior to calibration. 
The temperature range of the Furnace - from ambient to 1000ºC enables all types of
SPRT’s to be annealed.

• Maintenance Free Use

• Available with programmable controller with communications

• Temperature Range: Ambient to 1000°C

• Control: 0.1ºC Resolution

• Communications included as standard

• Supply: 110VAC, 3kw, 50/60Hz CTE 
  (230VAC and 110VAC to 110VAC Isolating Transformers are available)

One of the duties of a calibration laboratory manager is to ensure that the SPRT’s used in the
Laboratory are fully annealed and still within specification.
Just using the thermometers within the laboratory will cause work-hardening to take place
within the platinum coil of the SPRT.
Therefore regular annealing is required to ensure the SPRT’s are in an ideal condition.

In 1990 the new temperature scale ITS-90 specified the use of SPRT’s up to the Silver point (961.78ºC). At these temperatures quartz is very porous and in reducing atmospheres the SPRT’s can quickly become contaminated.
The Model 414 Annealing Furnace offers a safe solution for those who wish to anneal 
SPRT’s up to 1000ºC.
To prevent contamination at high temperatures a constant flux of pre-heated air passes the SPRT’s being annealed.
A comprehensive handbook accompanies the Furnace.
This Furnace is installed simply and requires no maintenance.