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

Preventing Carburizing By Copper-plating
Copper-plating has been found effective and must have a thick...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Pyrometry And Pyrometers
A knowledge of the fundamental principles of pyrometry, or th...

Introduction Of Carbon
The matter to which these notes are primarily directed is the...

Silicon
Silicon prevents, to a large extent, defects such as gas bubb...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

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

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

Carburizing Low-carbon Sleeves
Low-carbon sleeves are carburized and pushed on malleable-ir...

Nickel-chromium
A combination of the characteristics of nickel and the charac...

Quenching The Work
In some operations case-hardened work is quenched from the bo...

Leeds And Northrup Optical Pyrometer
The principles of this very popular method of measuring tempe...

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

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

A Chromium-cobalt Steel
The Latrobe Steel Company make a high-speed steel without tun...

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

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

Conclusions
Martien was probably never a serious contender for the honor ...

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



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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