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The Care Of Carburizing Compounds
Of all the opportunities for practicing economy in the heat-t...

High-carbon Machinery Steel
The carbon content of this steel is above 30 points and is ha...

The Influence Of Size
The size of the piece influences the physical properties obta...

Hints For Tool Steel Users
Do not hesitate to ask for information from the maker as to t...

Tool Or Crucible Steel
Crucible steel can be annealed either in muffled furnace or b...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Chrome-nickel Steel
Forging heat of chrome-nickel steel depends very largely on ...

Carbon-steel Forgings
Low-stressed, carbon-steel forgings include such parts as car...

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

Rate Of Absorption
According to Guillet, the absorption of carbon is favored by ...

Annealing Of Rifle Components At Springfield Armory
In general, all forgings of the components of the arms manufa...

Connecting Rods
The material used for all connecting rods on the Liberty engi...

The Leeds And Northrup Potentiometer System
The potentiometer pyrometer system is both flexible and subst...

William Kelly's Air-boiling Process
An account of Bessemer's address to the British Association w...

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

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

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

Tempering Round Dies
A number of circular dies of carbon tool steel for use in too...

Manganese
Manganese adds considerably to the tensile strength of steel,...

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



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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