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Steel Making

Knowing What Takes Place
How are we to know if we have given a piece of steel the ver...

Protectors For Thermo-couples
Thermo-couples must be protected from the danger of mechanica...

Uses Of The Various Tempers Of Carbon Tool Steel
DIE TEMPER.--No. 3: All kinds of dies for deep stamping, pres...

Standard Analysis
The selection of a standard analysis by the manufacturer is t...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

Annealing To Relieve Internal Stresses
Work quenched from a high temperature and not afterward tempe...

Heating Of Manganese Steel
Another form of heat-treating furnace is that which is used ...

Chromium
Chromium when alloyed with steel, has the characteristic func...

Flange Shields For Furnaces
Such portable flame shields as the one illustrated in Fig. 1...

Rate Of Cooling
At the option of the manufacturer, the above treatment of gea...

Furnace Data
In order to give definite information concerning furnaces, fu...

Drop Forging Dies
The kind of steel used in the die of course influences the he...

Heavy Forging Practice
In heavy forging practice where the metal is being worked at...

Carbon Tool Steel
Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham...

Quality And Structure
The quality of high-speed steel is dependent to a very great ...

Steel Worked In Austenitic State
As a general rule steel should be worked when it is in the a...

Gas Consumption For Carburizing
Although the advantages offered by the gas-fired furnace for ...

Cutting-off Steel From Bar
To cut a piece from an annealed bar, cut off with a hack saw,...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Silicon
SILICON is a very widespread element (symbol Si), being an es...



Brown Automatic Signaling Pyrometer






Category: PYROMETRY AND PYROMETERS

In large heat-treating plants it has been customary to maintain
an operator at a central pyrometer, and by colored electric lights
at the furnaces, signal whether the temperatures are correct or
not. It is common practice to locate three lights above each
furnace-red, white and green. The red light burns when the temperature
is too low, the white light when the temperature is within certain
limits--for example, 20 deg.F. of the correct temperature--and the
green light when the temperature is too high.



Instruments to operate the lights automatically have been devised and
one made by Brown is shown in Fig. 130. The same form of instrument is
used for this purpose to automatically control furnace temperatures,
and the pointer is depressed at intervals of every 10 sec. on contacts
corresponding to the red, white and green lights.





Next: An Automatic Temperature Control Pyrometer

Previous: Compensating Leads



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