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

Non-shrinking Oil-hardening Steels
Certain steels have a very low rate of expansion and contract...

Hardening
Steel is hardened by quenching from above the upper critical....

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Compensating Leads
By the use of compensating leads, formed of the same materia...

Machineability
Reheating for machine ability was done at 100 deg. less than ...

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

Nickel
Nickel may be considered as the toughest among the non-rare a...

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

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

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

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

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

Typical Oil-fired Furnaces
Several types of standard oil-fired furnaces are shown herew...

Temperatures To Use
As soon as the temperature of the steel reaches 100 deg.C. (...

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

Double Annealing
Water annealing consists in heating the piece, allowing it to...

Steel For Chisels And Punches
The highest grades of carbon or tempering steels are to be re...

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

Corrosion
This steel like any other steel when distorted by cold worki...



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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