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The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Classifications Of Steel
Among makers and sellers, carbon tool-steels are classed by g...

Hardness Testing
The word hardness is used to express various properties of me...

Protective Screens For Furnaces
Workmen needlessly exposed to the flames, heat and glare from...

Brown Automatic Signaling Pyrometer
In large heat-treating plants it has been customary to mainta...

Properties Of Alloy Steels
The following table shows the percentages of carbon, manganes...

Critical Points
One of the most important means of investigating the properti...

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

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

Take Time For Hardening
Uneven heating and poor quenching has caused loss of many ve...

Annealing Alloy Steel
The term alloy steel, from the steel maker's point of view, r...

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

A Satisfactory Luting Mixture
A mixture of fireclay and sand will be found very satisfactor...

Temperature For Annealing
Theoretically, annealing should be accomplished at a tempera...

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

Annealing Work
With the exception of several of the higher types of alloy s...

Hardening
The forgings can be hardened by cooling in still air or quen...

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

Heat-treating Department
The heat-treating department occupies an L-shaped building. ...

Plant For Forging Rifle Barrels
The forging of rifle barrels in large quantities and heat-tre...



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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