mm

(inch)

mbar/10 K

(psi/
10 K)

mbar/
(10 K · m_Cap)

(psi/
(10 K · m_Cap))

mbar/10 K

(psi/
10 K)

mbar

(psi)

Sandwich design or with flange to EN 1092-1

DN 50 without tube

59

(2.32)

1.5

(0.022)

2

(0.029)

2

(0.029)

200

(2.90)

DN 50 with tube

45

(1.89)

5

(0.073)

10

(0.145)

10

(0.145)

500

(7.25)

DN 80 without tube

89

(3.50)

0.2

(0.003)

0.2

(0.003)

0.2

(0.003)

100

(1.45)

DN 80 with tube

72

(2.83)

1

(0.015)

1

(1.015)

1

(1.015)

250

(3.63)

DN 100 without tube

89

(3.50)

0.2

(0.003)

0.4

(0.006)

0.4

(0.006)

100

(1.45)

DN 100 with tube

89

(3.50)

0.4

(0.006)

0.4

(0.006)

0.4

(0.006)

100

(1.45)

DN 125 without tube

124

(4.88)

0.2

(0.003)

0.1

(0.002)

0.1

(0.002)

20

(0.29)

DN 125 with tube

124

(4.88)

0.2

(0.003)

0.1

(0.002)

0.1

(0.002)

20

(0.29)

Sandwich design or with flange to ASME B16.5

2 inch without tube

59

(2.32)

1.5

(0.022)

2

(0.029)

2

(0.029)

200

(2.90)

2 inch with tube

45

(1.89)

5

(0.073)

10

(0.145)

10

(0.145)

500

(7.25)

3 inch without tube

89

(3.50)

0.2

(0.003)

0.2

(0.003)

0.2

(0.003)

100

(1.45)

3 inch with tube

72

(2.83)

1

(0.015)

1

(1.015)

1

(1.015)

250

(3.63)

4 inch without tube

89

(3.50)

0.2

(0.003)

0.4

(0.006)

0.4

(0.006)

100

(1.45)

4 inch with tube

89

(3.50)

0.4

(0.006)

0.4

(0.006)

0.4

(0.006)

100

(1.45)

5 inch without tube

124

(4.88)

0.2

(0.003)

0.1

(0.002)

0.1

(0.002)

20

(0.29)

5 inch with tube

124

(4.88)

0.2

(0.003)

0.1

(0.002)

0.1

(0.002)

20

(0.29)

Remote seal with union nut according to DIN 11851

DN 25

25

(0.98)

20

(0.290)

60

(0.870)

60

(0.870)

6000

(87)

DN 32

32

(1.26)

8

(0.116)

25

(0.363)

25

(0.363)

4000

(58)

DN 40

40

(1.57)

4

(0.058)

10

(0.145)

10

(0.145)

2000

(29)

DN 50

52

(2.05)

4

(0.058)

5

(0.073)

5

(0.073)

500

(7.25)

DN 65

59

(2.32)

3

(0.044)

4

(0.058)

4

(0.058)

500

(7.25)

DN 80

72

(2.83)

1

(0.015)

1

(0.015)

1

(0.015)

250

(3.63)

Remote seal, screwed gland design

DN 50

52

(2.05)

4

(0.058)

5

(0.073)

5

(0.073)

500

(7.25)

Remote seal with threaded socket according to DIN 11851

DN 25

25

(0.98)

20

(0.290)

60

(0.870)

60

(0.870)

6000

(87)

DN 32

32

(1.26)

8

(0.116)

25

(0.363)

25

(0.363)

4000

(58)

DN 40

40

(1.57)

4

(0.058)

10

(0.145)

10

(0.145)

2000

(29)

DN 50

52

(2.05)

4

(0.058)

5

(0.073)

5

(0.073)

500

(7.25)

DN 65

59

(2.32)

3

(0.044)

4

(0.058)

4

(0.058)

500

(7.25)

DN 80

72

(2.83)

1

(0.015)

1

(0.015)

1

(0.015)

250

(3.63)

Clamp connection

1Ѕ inch

32

(1.26)

8

(0.116)

25

(0.363)

25

(0.363)

4000

(58)

2 inch

40

(1.57)

4

(0.058)

10

(0.145)

10

(0.145)

2000

(29)

2Ѕ inch

59

(2.32)

3

(0.044)

5

(0.073)

5

(0.073)

500

(7.25)

3 inch

72

(2.83)

1

(0.015)

1

(0.015)

1

(0.015)

250

(3.63)

Miniature diaphragm seal

G1B

25

(0.98)

20

(0.290)

60

(0.870)

60

(0.870)

6000

(87)

G1ЅB

40

(1.57)

4

(0.058)

10

(0.145)

10

(0.145)

2000

(29)

G2B

52

(2.05)

4

(0.058)

5

(0.073)

5

(0.073)

500

(7.25)

mm

(inch)

mbar/
10 K

(psi/
10 K)

mbar/
(10 K · m_Cap)

(psi/
(10 K · m_Cap))

mbar/10 K

(psi/
10 K)

mbar

(psi)

Sandwich design or with flange to EN 1092-1

DN 50 without tube

59

(2.32)

0.3

(0.0043)

0.3

(0.0045)

0.3

(0.0045)

250

(3.626)

DN 50 with tube

45

(1.89)

1.26

(0.018)

1.7

(0.025)

1.7

(0.025)

250

(3.626)

DN 80 without tube

89

(3.50)

0.05

(0.001)

0.05

(0.001)

0.05

(0.0007)

50

(0.725)

DN 80 with tube

72

(2.83)

0.24

(0.004)

0.17

(0.003)

0.17

(0.003)

100

(1.45)

DN 100 without tube

89

(3.50)

0.05

(0.001)

0.07

(0.001)

0.07

(0.001)

50

(0.725)

DN 100 with tube

89

(3.50)

0.1

(0.002)

0.07

(0.001)

0.07

(0.001)

50

(0.725)

DN 125 without tube

124

(4.88)

0.05

(0.001)

0.03

(0.0004)

0.03

(0.0004)

20

(0.29)

DN 125 with tube

124

(4.88)

0.05

(0.001)

0.03

(0.0004)

0.03

(0.0004)

20

(0.29)

Sandwich design with flange to ASME B16.5

2 inch without tube

59

(2.32)

0.3

(0.0043)

0.3

(0.0043)

0.3

(0.0045)

250

(3.626)

2 inch with tube

45

(1.89)

1.26

(0.018)

1.7

(0.025)

1.7

(0.025)

250

(3.626)

3 inch without tube

89

(3.50)

0.05

(0.001)

0.05

(0.0007)

0.05

(0.0007)

50

(0.725)

3 inch with tube

72

(2.83)

0.24

(0.004)

0.17

(0.003)

0.17

(0.003)

100

(1.45)

4 inch without tube

89

(3.50)

0.05

(0.001)

0.07

(0.001)

0.07

(0.001)

50

(0.725)

4 inch with tube

89

(3.50)

0.1

(0.002)

0.07

(0.001)

0.07

(0.001)

50

(0.725)

5 inch without tube

124

(4.88)

0.05

(0.001)

0.03

(0.0004)

0.03

(0.0004)

20

(0.29)

5 inch with tube

124

(4.88)

0.05

(0.001)

0.03

(0.0004)

0.03

(0.0004)

20

(0.29)

Remote seal, screwed gland design

DN 50

52

(2.05)

1

(0.015)

0.83

(0.012)

0.83

(0.012)

250

(3.626)

Remote seal with union nut according to DIN 11851

DN 50

52

(2.05)

1

(0.015)

0.83

(0.012)

0.83

(0.012)

250

(3.626)

DN 65

59

(2.32)

0.7

(0.010)

0.67

(0.010)

0.67

(0.010)

250

(3.626)

DN 80

72

(2.83)

0.24

(0.004)

0.17

(0.003)

0.17

(0.003)

100

(1.450)

Remote seal with threaded socket to DIN 11851

DN 50

52

(2.05)

1

(0.015)

0.83

(0.012)

0.83

(0.012)

250

(3.626)

DN 65

59

(2.32)

0.7

(0.010)

0.67

(0.010)

0.67

(0.010)

250

(3.626)

DN 80

72

(2.83)

0.24

(0.004)

0.17

(0.003)

0.17

(0.003)

100

(1.450)

Clamp connection

2 inch

40

(1.57)

1

(0.015)

2.5

(0.036)

2.5

(0.036)

2000

(29.01)

2Ѕ inch

59

(2.32)

0.7

(0.010)

0.67

(0.010)

0.67

(0.010)

250

(3.626)

3 inch

72

(2.83)

0.24

(0.004)

0.17

(0.003)

0.17

(0.003)

100

(1.450)

mbar/10 K

(psi/10 K)

mbar/10 K

(psi/10 K)

mbar/10 K

(psi/10 K)

mbar

(psi)

DN 25 (1 inch)

6.0

(0.0870)

8.5

(0.123)

8.5

(0.123)

1000

(14.5)

DN 40 (1Ѕ inch)

4.5

(0.065)

4.5

(0.065)

4.5

(0.065)

250

(3.63)

DN 50 (2 inch)

4.0

(0.058)

3.0

(0.044)

3.0

(0.044)

100

(1.45)

DN 80 (3 inch)

9.5

(0.138)

5.0

(0.073)

5.0

(0.073)

100

(1.45)

DN 100 (4 inch)

8.0

(0.012)

3.0

(0.044)

3.0

(0.044)

100

(1.45)

mbar/10 K

(psi/10 K)

mbar/10 K

(psi/10 K)

mbar/10 K

(psi/10 K)

mbar

(psi)

DN 25 (1 inch)

2.3

(0.033)

1.8

(0.026)

1.8

(0.026)

1000

(14.5)

DN 40 (1Ѕ inch)

0.8

(0.012)

0.3

(0.004)

0.3

(0.004)

250

(3.63)

DN 50 (2 inch)

0.3

(0.004)

0.1

(0.002)

0.1

(0.002)

100

(1.45)

DN 80 (3 inch)

3.0

(0.044)

0.5

(0.007)

0.5

(0.007)

100

(1.45)

DN 100 (4 inch)

1.0

(0.015)

0.1

(0.002)

0.1

(0.002)

100

(1.45)

dp = (П‘_RS – П‘_Cal) · f_RS + (П‘_Cap – П‘_Cal) · l_Cap ·f_Cap + (П‘_TR – П‘_Cal) · f_PF

dp

Additional temperature error (mbar)

П‘_RS

Temperature on remote seal diaphragm (generally corresponds to temperature of medium)

П‘_Cal

Calibration (reference) temperature (20 °C (68 °F))

f_DM

Temperature error of remote seal

П‘_Cap

Ambient temperature on the capillaries

l_Cap

Capillary length

_{f Cap}

Temperature error of capillaries

П‘_TR

Ambient temperature on pressure transmitter

f_PF

Temperature error of the oil filling in the process flanges of the pressure transmitter

Given:

SITRANS P pressure transmitter for differential pressure, 250 mbar, set to 0 ... 100 mbar, with DN 100 remote seal diaphragms without tube, diaphragm made of stainless steel, mat. no. 1.4404/316L

f_DM = 0.05 mbar/10 K
(0.039 inH₂O/10 K)

Capillary length

l_Cap = 6 m (19.7 ft)

Capillaries fitted on both sides

f_Cap = 0.07 mbar/(10 K · m_Cap)
0.028 inH₂O/(10 K · m_Cap))

Fill fluid silicone oil M5

f_PF = 0.07 mbar/10 K
(0.028 inH₂O/10 K)

Temperature of medium

П‘_RS = 100 °C (212 °F)

Temperature on the capillaries

П‘_Cap = 50 °C (122 °F)

Temperature on pressure transmitter

П‘_TR = 50 °C (122 °F)

Calibration temperature

П‘_Cal = 20 °C (68 °F)

Required:

Additional temperature error of remote seals

dp

in mbar

dp = (100 °C – 20 °C) · 0.05 mbar/10 K + (50 °C – 20 °C) · 6 m · 0.07 mbar/(10 K · m) + (50 °C – 20 °C) · 0.07 mbar/10 K

dp = 0.4 mbar + 1.26 mbar + 0.21 mbar

in inH₂O:

dp = (212 °F – 68 °F) · 0.039 inH₂O/10 K + (112 °F – 68 °F) · 19.7 ft · 0.028 inH₂O/(10 K · 3.28 ft) + (112 °F – 68 °F) · (0.028 inH₂O/10 K)

dp = 0.16 inH₂O + 0.51 inH₂O + 0.08 inH₂O

dp = 1.87 mbar (0.75 inH₂O)

(corresponds to 2.27 % of set span)

Note

The determined temperature error only applies to the error resulting from connection of the remote seal.

The transmission response of the respective pressure transmitter is not taken into account here!
It must be calculated separately, and the resulting error added to the error determined above from connection of the remote seal.

Diaphragm material

Change in temperature error of remote seal

Increase in values by

Stainless steel, duplex, ...

See previous tables

Hastelloy C4, mat. no. 2.4602

50 %

Hastelloy C276, mat. no. 2.4819

50 %

Monel 400, mat. no. 2.4360

60 %

Tantalum

50 %

Titanium

50 %

PTFE coating on stainless steel diaphragm

80 %

ECTFE coating or PFA coating on stainless steel diaphragm

100 %

Gold coating on stainless steel diaphragm

40 %

Inconel

50 %

Incoloy

50 %

°C

(°F)

°C

(°F)

Stainless steel, mat. no. 1.4404/316L

200

(392)

400

(662)

PTFE coating

200

(392)

260

(500)

ECTFE coating

On request

150

(302)

PFA coating

200

(392)

260

(500)

Hastelloy C4, mat. no. 2.4602

200

(392)

260

(500)

Hastelloy C276, mat. no. 2.4819

200

(392)

400

(662)

Monel 400, mat. no. 2.4360

200

(392)

400

(662)

Tantalum

200

(392)

300

(572)

Duplex, mat. no. 1.4462

200

(392)

300

(572)

Titanium

100

(212)

150

(302)

Inconel

200

(392)

400

(752)

Incoloy

200

(392)

400

(752)

Gold coating

200

(392)

400

(752)

Diaphragm seal

Clamp-on seal

m

(ft)

m

(ft)

DN 25

(1 inch)

2.5

(8.2)

2.5

(8.2)

DN 32

(1ј inch)

2.5

(8.2)

2.5

(8.2)

DN 40

(1Ѕ inch)

4

(13.1)

6

(19.7)

DN 50

(2 inch)

6

(19.7)

10

(32.8)

DN 65

(2Ѕ inch)

8

(26.2)

10

(32.8)

DN 80

(3 inch)

15

(49.1)

10

(32.8)

DN 100

(4 inch)

15

(49.1)

10

(32.8)

DN 125

(5 inch)

15

(49.1)

-

-

kg/dm³

(lb/in³)

°C

(°F)

250 mbar

(101 inH₂O)

600 mbar

(241 inH₂O)

1600 mbar

(643 inH₂O)

Silicone oil M5

0.914

(0.033)

+60

(140)

0.06

(0.018)

0.02

(0.006)

0.01

(0.003)

+20

(68)

0.11

(0.034)

0.02

(0.006)

0.02

(0.006)

- 20

(-4)

0.3

(0.091)

0.12

(0.037)

0.05

(0.015)

Silicone oil M50

0.966

(0.035)

+60

(140)

0.6

(0.183)

0.25

(0.076)

0.09

(0.027)

+20

(68)

0.61

(0.186)

0.26

(0.079)

0.1

(0.030)

- 20

(-4)

1.69

(0.515)

0.71

(0.216)

0.27

(0.082)

High-temperature oil

1.070

(0.039)

+60

(140)

0.14

(0.043)

0.06

(0.018)

0.02

(0.006)

+20

(68)

0.65

(0.198)

0.27

(0.082)

0.1

(0.030)

-10

(14)

3.96

(1.207)

1.65

(0.503)

0.62

(0.189)

Halocarbon oil

1.968

(0.071)

+60

(140)

0.07

(0.021)

0.03

(0.009)

0.01

(0.003)

+20

(68)

0.29

(0.088)

0.12

(0.037)

0.05

(0.015)

- 20

(-4)

2.88

(0.878)

1.2

(0.366)

0.45

(0.137)

Food oil (FDA-listed)

0.920

(0.033)

+60

(140)

0.75

(0.229)

0.33

(0.101)

0.17

(0.052)

+20

(68)

4

(1.220)

1.75

(0.534)

0.67

(0.204)

- 20

(-4)

20

(6,100)

8.5

(2.593)

3.25

(0.991)