## How Bimetallic Temperature Gauges Works !! ||Engineer's Academy||

hey guys welcome back to another video

of engineers Academy so guys in this

video we are going to learn the how by

metallic thermometers works basically

and what are the specifications and how

the bi-metal thermometers are specified

so we learn the specifications also so

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dedicated so guys let's begin with our

today's topic that is how bi-metal

thermometers works so guys it is also

called known as the bi-metal temperature

gauge so guys the it is the mechanical

measurement system in the last video we

have seen in which this the mechanical

arrangement is there in which this

particular bimetallic strip which is

used so to measure the temperature by

the means of this bimetallic helix

basically so guys over here in this case

this bimetallic strip in the form of

hellix is used so it's over here in the

strip the two dissimilar metals are

joined and fused together to form a

bimetallic strip and it expands with the

increase in a temperature and it

deflects the pointer which shows a

reading on a scale basically so guys but

why this bimetallic strip consists of

two different metals why not the single

different metal so guys let's go in

history that we have conducted an

experiment this is the ball and a ring

so as whenever we heat the ball

first of all it can passes through the

ring easily and after heating it won't

pass through the ring so as through that

particular experiment we can understand

a solid expands when heated and

contracts when cooled because this is

the basic principle behind this working

of bimetallic temperature gauge so guys

whenever if we use a single metallic

strip over here in case of bimetallic

gauge can gauge comes down quickly to

zero whenever if suppose the temperature

gets reduced can this pointer comes down

quickly to zero the rate of contraction

over here matters

no this it won't comes over here

directly and quickly to zero so that's

why guys the metallic strip which is

used so guys in the bimetallic strip

there are two different metals having

low expansion coefficient and high

thermal expansion coefficient so where

is this two different dissimilar metals

one is used for going temperature up and

second is used for going temperature

down so guys this is the industrial

representation over here this is the how

a gauge actually looks like so guys

let's check out the specifications of

this particular temperature gauge the

first of all the dial size so as we have

seen in the pressure gauges the dial

cells can be of 2.5 inch 4 inch and 6

inches the temperature range over here

is as per the standard the standard

which is used over here is en 1 3 1 9 0

it is the standard for the temperature

range the next one is the mounting type

so guys the mounting which I have shown

over here this is the direct bottom type

it can be changed like from the back

entry like the horizontal arrangement of

the temperature gauge this is the back

entry type and the vertical is the

direct bottom type it can be of the all

angle like it can be viewed from every

angle that's why it is known as the

every angle type

country over here this why cos gage is

having every angle type so where is this

mounting type can be of direct bottom

back entry or every angle type so why is

moving next is the stem diameter so

where is the stem diam can be vary from

6 mm 8 mm and 10 mm wise so over here

this is the stem diameter basically this

apart from the stem diameter next is the

stem length which can be very depends

upon the requirement of the customer

that is from 100 200 and 300 mm next is

the process connection so where is the

process connection each how can we fixed

this upon our requirement on the

equipment that can be a half-inch bsv or

NPD it can be anything that is fixed or

adjustable so guys these all other

specifications which are needed to

specify this bimetallic temperature gage

so guys over here this glycerine filling

is not possible in case of biometallic

temperature gage so guys over here in

this video we have seen the construction

or for this bimetallic temperature gauge

and the specifications we have seen over

here in this video so guys I hope you

understand very well how does this

bimetallic

temperature gauge works so guys don't

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you're having any doubts and queries

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