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Steel Making

Robert Mushet
Robert (Forester) Mushet (1811-1891), born in the Forest of D...

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

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

Restoring Overheated Steel
The effect of heat treatment on overheated steel is shown gra...

Fatigue Tests
It has been known for fifty years that a beam or rod would fa...

High Speed Steel
For centuries the secret art of making tool steel was handed ...

Lathe And Planer Tools
FORGING.--Gently warm the steel to remove any chill, is parti...

The Penetration Of Carbon
Carburized mild steel is used to a great extent in the manufa...

Pyrometers For Molten Metal
Pyrometers for molten metal are connected to portable thermoc...

Composition Of Transmission-gear Steel
If the nickel content of this steel is eliminated, and the pe...

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

Separating The Work From The Compound
During the pulling of the heat, the pots are dumped upon a ca...

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

Heat Treatment Of Milling Cutters Drills Reamers Etc
THE FIRE.--Gas and electric furnaces designed for high heats ...

Shrinking And Enlarging Work
Steel can be shrunk or enlarged by proper heating and cooling...

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

Annealing
ANNEALING can be done by heating to temperatures ranging from...

The Forging Of Steel
So much depends upon the forging of steel that this operation...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

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



Placing Of Pyrometers






Category: PYROMETRY AND PYROMETERS

When installing a pyrometer, care should be
taken that it reaches directly to the point desired to be measured,
that the cold junction is kept cold, and that the wires leading to
the recording instrument are kept in good shape. The length of
these lead wires have an effect; the longer they are, the lower
the apparent temperature.

When pyrometers placed in a number of furnaces are connected up
in series, and a multiple switch is used for control, it becomes
apparent that pyrometers could not be interchanged between furnaces
near and far from the instrument without affecting the uniformity
of product from each furnace.

Calibration can best be done without disturbing the working pyrometer,
by inserting the master instrument into each furnace separately, place
it alongside the hot junction of the working pyrometer, and compare
the reading given on the indicator connected with the multiple
switch.

Protection tubes should be replaced when cracked, as it is important
that no foreign substance is allowed to freeze in the tube, so
that the enclosed junction becomes a part of a solid mass joined
in electrical contact with the outside protecting tube. Wires over
the furnaces must be carefully inspected from time to time, as no
true reading can be had on an instrument, if insulation is burned
off and short circuits result.

If the standard calibrating instrument used contains a dry battery,
it should be examined from time to time to be sure it is in good
condition.





Next: The Leeds And Northrup Potentiometer System

Previous: Complete Calibration Of Pyrometers



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