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Termoparalarning texnik tavsiflari
2 – jadval
Termoel
ektrod
turi
Graduirov
ka
Termoelektrod
Materiali
Uzoq muddatga
ishlatilganda
temperaturani o’lchash
chegarasi, K
Qisqa muddatga
ishlatilganda
temperaturani
o’lchash ruxsat
berilgan chegarasi, K
TPP
TPR
TXA
TXK
PP-1
PP-30/6
XA
XK
Platinarodiy
(10%
rodiy) – platina
Platinarodiy
(30%
rodiy)–platinarodiy
Xromel-alyumel
Xromel-kopel
253 - 1573
573 - 1873
223 – 1273
223 – 873
1873
2073
1573
1073
Termoelektrik o'zgartgichning afzalliklari quyidagilardan iborat: yuqori
o'lchash chegarasiga ega, yuqori sezgirlik, kichik inersionlik, qo'shimcha tok
manbayi talab qilinmaydi, o'lchashni masofaga uzatish imkoniyatiga ega.
Termoelektrik o'zgartgichning erkin uchlarida temperaturani bir xilda saqlab
turish talab qilinishi ularning kamchiligi hisoblanadi. Birinchi nomlari yozilgan
qotishmalar musbat elektrodlar hisoblanadi.
TEO'lar bilan komplektda birgalikda ikkilamchi asbob sifatida pirometrik
millivoltmetr va avtomatik potensiometrlar ishlatiladi.
QARSHILIK TERMOMETRLARI
Temperaturani past chegaralarda o'lchashda keng qo'llaniladigan termo o'lchov
asbobi
qarshilik termometri
hisoblanadi. Bu termometrlarni markazlashtirilgan
holda, masofadan turib ko'p nuqtalarda temperaturani o'lchashi asosiy o'rin tutadi
(boshqalardan farq qiladi). Qarshilik termometrlari yordamida temperaturani
o'lchash temperatura o'zgarishi bilan o'tkazgichlar va yarim o'tkazgichlar
qarshiligining o'zgarish xususiyatiga asoslangan.
Termometming sezgir elementlarini tayyorlash uchun platina va mis
metallaridan foydalaniladi. Platinadan tayyorlangan termometrlar -200°C dan
+1100°C gacha, misdan tayyorlanganlari esa -50°C dan +200°C gacha chegarada
temperaturalarni o'lchaydi.
53
Qarshilik termometri bilan birgalikda ishlatiladigan o'lchash komplekti
quyidagi elementlardan iborat: qarshilik termometri, elektr ulash simlari, tok
manbayi va o'lchash asbobi.
Bitta o'lchash asbobiga qayta ulagich yordamida bir nechta qarshilik
termometrlarini ulash mumkin.
Qarshilik termometrlarini darajalash ular tayyorlangan materialni 0
0
C dagi
qarshiligini o'lchash bilan amalga oshiriladi. Quyidagi daraja turlari mavjud:
Daraja turi 20 21 22 23 24
0
0
C dagi qarshiligi, Om 10 46 100 53 100
20, 21 va 22 — darajali qarshilik termometrlari uchun platinadan, 23, 24 —
darajalisi uchun esa misdan foydalaniladi.
4
-
ja
d
v
al
2
0
v
a
2
2
–
d
ar
aj
al
i,
p
lat
in
ad
an
t
ay
y
o
rl
an
g
an
q
ar
sh
il
ik
t
erm
o
met
rl
ar
in
in
g
d
ara
ja
las
h
j
ad
v
al
i
R,
Om
3
0
0
,58
3
0
3
,90
3
0
7
,21
3
1
0
,50
3
1
3
,79
3
1
7
,06
3
2
0
,32
3
2
3
,57
3
2
6
,80
3
3
0
,03
3
3
3
,25
-
-
-
-
t,
0
C
55
0
56
0
57
0
58
0
59
0
60
0
61
0
62
0
63
0
64
0
65
0
-
-
-
-
R,
Om
24
9
,3
8
25
2
,8
8
25
6
,3
6
25
9
,8
3
26
3
,2
9
26
6
,7
4
27
0
,1
8
27
3
,6
0
27
7
,0
1
28
0
,4
1
28
3
,8
0
28
7
,1
8
29
0
,5
5
29
3
,9
1
29
7
,2
5
t,
0
C
40
0
41
0
42
0
43
0
44
0
45
0
46
0
47
0
48
0
49
0
50
0
51
0
52
0
53
0
54
0
R,
Om
1
9
5
,56
19
9
,23
20
2
,89
20
6
,53
21
0
,17
21
3
,79
21
7
,40
22
1
,00
22
4
,59
22
8
,17
23
1
,73
23
5
,29
2
3
8
,83
24
2
,36
24
5
,88
t
,
0
C
2
50
2
60
2
70
2
80
2
90
3
00
3
10
3
20
3
30
3
40
3
50
3
60
3
70
3
80
3
90
R,
Om
1
3
9
,
10
1
4
2
,
95
1
4
6
,
78
1
5
0
,
60
1
5
4
,
41
1
5
9
,
21
1
6
2
,
00
1
6
5
,
78
1
6
9
,
54
1
7
3
,
29
1
7
7
,
03
1
8
0
,
76
1
8
4
,
48
1
8
8
,
18
1
9
1
,
88
t,
0
C
1
00
1
10
1
20
1
30
1
40
1
50
1
60
1
70
1
80
1
90
2
00
2
10
2
20
2
30
2
40
R,
Om
8
0
,0
8
4
,0
3
8
8
,0
4
9
2
,0
4
9
6
,0
3
1
0
0
,
00
1
0
3
,
96
1
0
7
,
91
1
1
1
,
85
1
1
5
,
78
1
1
9
,
70
1
2
3
,
60
12
7,
49
1
3
1
,
37
1
3
5
,
24
t,
0
C
-
50
-
40
-
30
-
20
-
10
0
1
0
2
0
3
0
4
0
5
0
6
0
7
0
8
0
9
0
54
R,
Om
17,
28
21,
65
25,
98
30,
29
34,
56
38,
80
43,
02
47,
21
51,
38
55,
52
59,
65
63,
75
67,
84
71,
91
75,
96
t,
0
C
-
2
0
0
-
1
9
0
-
1
8
0
-
1
7
0
-
1
6
0
-
1
5
0
-
1
4
0
-
1
3
0
-
1
2
0
-
1
1
0
-
1
0
0
-
90
-
80
-
70
-
60
5
-
ja
d
v
al
21
–
d
araj
al
i,
p
la
ti
n
ad
an
t
ay
y
o
rl
an
g
an
qar
sh
il
ik
t
erm
o
me
tr
lari
n
in
g
d
ara
ja
la
sh
j
ad
v
al
i
R,
Om
1
3
7
,
27
1
3
9
,
79
1
4
1
,
32
1
4
2
,
83
1
4
4
,
34
1
4
5
,
85
1
4
7
,
35
1
4
8
,
84
1
5
0
,
33
1
5
1
,
81
1
5
3
,
30
-
-
-
-
t,
0
C
5
50
5
60
5
70
5
80
5
90
6
00
6
10
6
20
6
30
6
40
6
50
-
-
-
-
R,
Om
1
1
4
,
72
1
1
6
,
32
1
1
7
,
93
1
1
9
,
52
1
2
1
,
11
1
2
2
,
70
1
2
4
,
28
1
2
5
,
86
1
2
7
,
43
1
2
8
,
99
1
3
0
,
55
1
3
2
,
10
1
3
3
,
65
1
3
5
,
20
1
3
6
,
73
t,
0
C
40
0
41
0
42
0
43
0
44
0
45
0
46
0
47
0
48
0
49
0
50
0
51
0
52
0
53
0
54
0
R,
Om
8
9
,9
6
9
1
,6
4
9
3
,3
3
9
5
,0
0
9
5
,8
6
9
8
,3
4
1
0
0
,
01
1
0
1
,
66
1
0
3
,
31
1
0
4
,
96
1
0
6
,
60
1
0
8
,
23
1
0
9
,
86
1
1
1
,
48
1
3
0
,
10
t,
0
C
25
0
26
0
27
0
28
0
29
0
30
0
31
0
32
0
33
0
34
0
35
0
36
0
37
0
38
0
39
0
R,
Om
6
3
,9
9
6
5
,7
6
6
7
,5
2
6
9
,2
8
7
1
,0
3
7
2
,7
8
7
4
,5
2
7
6
,2
6
7
7
,9
9
7
9
,7
1
8
1
,4
3
8
3
,1
5
8
4
,8
6
8
6
,5
6
8
8
,2
6
t,
0
C
10
0
11
0
12
0
13
0
14
0
15
0
16
0
17
0
18
0
19
0
20
0
21
0
2
2
0
23
0
24
0
R,
Om
3
6
,8
0
3
8
,6
5
4
0
,5
0
4
2
,3
4
4
4
,1
7
4
6
,0
0
4
7
,8
2
4
9
,6
4
5
1
,4
5
5
3
,2
6
5
5
,0
6
5
6
,8
6
5
8
,6
5
6
0
,4
3
6
2
,2
1
t,
0
C
-
50
-
40
-
30
-
20
-
10
0
10
20
30
40
50
60
70
80
90
R,
Om
7
,9
5
9
,9
6
1
1
,9
5
1
3
,9
3
1
5
,9
0
1
7
,8
5
1
9
,7
9
2
1
,7
2
2
3
,6
3
2
5
,5
4
2
7
,4
4
2
9
,3
3
3
1
,2
1
33,
0
8
3
4
,9
4
t,
0
C
-
2
0
0
-
1
9
0
-
1
8
0
-
1
7
0
-
1
6
0
-
1
5
0
-
1
4
0
-
1
3
0
-
1
2
0
-
1
1
0
-
1
0
0
-
90
-
80
-
70
-
60
55
6
-
ja
d
v
al
2
3
–
d
ara
ja
li
,
p
lat
in
ad
an
ta
y
y
o
rl
an
g
an
q
ars
h
il
ik
ter
mo
met
rl
ari
n
in
g
d
ara
ja
las
h
j
ad
v
al
i
R,
Om
86
,87
89
,13
91
,38
93
,64
-
7
-
ja
d
v
al
24
–
d
araj
al
i,
p
la
ti
n
ad
an
tay
y
o
rl
an
g
an
q
ar
sh
il
ik
term
o
me
tr
lar
in
in
g
d
araj
al
as
h
j
ad
v
al
i
R,
Om
16
3
,9
0
16
8
,1
6
17
2
,4
2
17
6
,6
8
-
t,
0
C
15
0
16
0
17
0
18
0
-
t,
0
C
15
0
16
0
17
0
18
0
-
R,
Om
75
,58
77
,84
80
,09
82
,35
84
,61
R,
Om
14
2
,6
0
14
6
,8
6
15
1
,1
2
15
5
,3
8
15
9
,6
4
t,
0
C
10
0
11
0
12
0
13
0
14
0
t,
0
C
10
0
11
0
12
0
13
0
14
0
R,
Om
64
,29
66
,55
68
,81
71
,06
73
,32
R,
Om
12
1
,3
0
12
5
,5
6
12
9
,8
2
13
4
,0
8
13
8
,3
4
t,
0
C
5
0
6
0
7
0
8
0
9
0
t,
0
C
5
0
6
0
7
0
8
0
9
0
R
,
O
m
5
3
,0
0
5
5
,2
6
5
7
,5
2
5
9
,7
7
6
2
,0
3
R
,
O
m
1
0
0
,0
0
1
0
4
,2
6
1
0
8
,5
2
1
1
2
,7
8
1
1
7
,0
4
t,
0
C
0
1
0
2
0
3
0
4
0
t,
0
C
0
1
0
2
0
3
0
4
0
R
,
O
m
4
1
,7
1
4
3
,9
7
4
6
,2
3
4
8
,4
8
5
0
,7
4
R
,
O
m
7
8
,7
0
8
2
,9
6
8
7
,2
2
9
1
,4
8
9
5
,7
4
t,
0
C
-
50
-
40
-
30
-
20
-
10
t,
0
C
-
50
-
40
-
30
-
20
-
10
Platina va misdan tayyorlangan qarshilik termometrlarini darajalash 4, 5, 6, 7-
jadvallarda keltirilgan.
R
0
= 100 Om - 21 darajali termometrlar uchun;
R
0
= 10 Om - 20 darajali termometrlar uchun.
(0
0
C dagi qarshiligi 10 Om bo'lgan termometrlar uchun barcha qiymatlarni 10
ga bo'lish tavsiya etiladi).
Termometrlarning darajalash jadvallarida keltirilgan turli temperaturalardagi
elektr qarshiliklar quyidagi formulalar bo'yicha aniqlanadi:
a)
platinadan tayyorlangan qarshilik termometrlari uchun:
,
agar – 200 °C ≤
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