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Temperature error
Diaphragm seal
Temperature errors of diaphragm seals when connected to pressure transmitters for pressure, absolute pressure, differential pressure (single-sided) and level
|
Nominal diameter/design |
Diaphragm diameter |
Temperature error of remote seal |
Temperature error of capillary |
Temperature error of process flange/connection spigot |
Recommended min. spans (guidance values, observe temperature error) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
mm (inch) |
(inch) |
mbar/10 K |
(psi/ |
mbar/ |
(psi/ |
mbar/10 K |
(psi/ |
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 |
48 |
(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 |
48 |
(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 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 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 |
1 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) |
|
|
2 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) |
160 |
(2.321) |
6000 |
(87) |
|
G1 B |
40 |
(1.57) |
4 |
(0.058) |
10 |
(0.145) |
15 |
(0.218) |
2000 |
(29) |
|
|
G2B |
52 |
(2.05) |
4 |
(0.058) |
5 |
(0.073) |
5 |
(0.073) |
500 |
(7.25) |
|
Remarks:
- Values apply for the filling liquids silicone oil M5, silicone oil M50, high-temperature oil, halocarbon oil and food oil (FDA listed).
- Half the values apply to glycerin/water mixture as the filling liquid.
- Values apply to stainless steel as the diaphragm material.
Temperature errors of diaphragm seals with connection to differential pressure transmitters (double-sided)
|
Nominal diameter/design |
Diaphragm diameter |
Temperature error of remote seal |
Temperature error of capillary |
Temperature error of process flange/connection spigot |
Recommended min. spans (guidance values, observe temperature error) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
mm (inch) |
(inch) |
mbar/ |
(psi/ |
mbar/10 K |
(psi/ |
mbar/10 K |
(psi/ |
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 |
48 |
(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 |
48 |
(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 |
-3626 |
|
Remote seal with union nut 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) |
|
2 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) |
|
Remarks:
- Values apply for the filling liquids silicone oil M5, silicone oil M50, high-temperature oil, halocarbon oil and food oil (FDA listed)
- Half the values apply to glycerin/water mixture as the filling liquid
- Values apply to stainless steel as the diaphragm material.
Clamp-on seal
Temperature errors of clamp-on seals when connected to pressure transmitters for pressure and absolute pressure, and withsingle-sidedconnection to pressure transmitters for differential pressure
|
Nominal diameter/design |
Temperature error of remote seal |
Temperature error of capillary |
Temperature error of process flange/connection spigot |
Recommended min. spans (guidance values, observe temperature error) |
||||
|---|---|---|---|---|---|---|---|---|
|
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 (1 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) |
Temperature errors of clamp-on seals withdouble-sidedconnection to pressure transmitters for differential pressure
|
Nominal diameter/design |
Temperature error of remote seal |
Temperature error of capillary |
Temperature error of process flange/connection spigot |
Recommended min. spans (guidance values, observe temperature error) |
||||
|---|---|---|---|---|---|---|---|---|
|
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 (1 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) |
Remarks:
- Values apply for the filling liquids silicone oil M5, silicone oil M50, high-temperature oil, halocarbon oil and food oil (FDA listed).
- Half the values apply to glycerin/water mixture as the filling liquid.
- Values apply to stainless steel as the diaphragm material.
- Diaphragm thickness 0.05 mm (0.002 inch) for DN 25/DN 40/DN 50 and 0.1 mm (0.004 inch) for DN 80/DN 100
Calculation of the temperature error
The following equation is used to calculate the temperature error:
|
dp = (RS –Cal) · fRS + (Cap –Cal) · lCap ·fCap + (TR –Cal) · fPF |
|
|
dp |
Additional temperature error (mbar) |
|
RS |
Temperature on remote seal diaphragm (generally corresponds to temperature of medium) |
|
Cal |
Calibration (reference) temperature (20 °C (68 °F)) |
|
fDM |
Temperature error of remote seal |
|
Cap |
Ambient temperature on the capillaries |
|
lCap |
Capillary length |
|
f Cap |
Temperature error of capillaries |
|
TR |
Ambient temperature on pressure transmitter |
|
f PF |
Temperature error of the oil filling in the process flanges of the pressure transmitter |
Example of temperature error calculation
|
Existing conditions |
|
|
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 |
fRS = 0.05 mbar/10 K (0.039 inH2O/10 K) |
|
Capillary length |
lCap = 6 m (19.7 ft) |
|
Capillaries fitted on both sides |
fCap = 0.07 mbar/(10 K · mCap) 0.028 inH2O/(10 K mCap)) |
|
Filling liquid silicone M5 |
fP = 0.07 mbar/10 K (0.028 inH2O/10 K) |
|
Temperature of medium |
RS = 100 °C (212 °F) |
|
Temperature on the capillaries |
Cap = 50 °C (122 °F) |
|
Temperature on pressure transmitter |
TR = 50 °C (122 °F) |
|
Calibration temperature |
Cal = 20 °C (68 °F) |
|
Required |
|
|
Additional temperature error of remote seals |
dp |
|
Calculation |
|---|
|
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 = 0.8 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 = 0.32 inH2O + 0.51 inH2O + 0.08 inH2O |
|
Result |
|---|
|
dp = 2.27 mbar (0.91 inH 2 O) (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 isnot taken into account here! |
Dependence of temperature error on diaphragm material
The temperature errors listed in the previous table are based on the use of stainless steel as the diaphragm material. If other diaphragm materials are used, the temperature errors change as follows:
|
Diaphragm material |
Change in temperature error of remote seal |
|
Increase in values by |
|
|
Stainless steel |
See previous tables |
|
Hastelloy C4, mat. no. 2.4610 |
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 % |
Maximum temperature of medium
The following maximum temperatures of the medium apply depending on the material of the wetted parts:
|
Material |
pabs < 1 bar (402 inH2O) |
pabs > 1 bar (402 inH2O) |
||
|---|---|---|---|---|
|
°C |
(°F) |
°C |
(°F) |
|
|
Stainless steel, 316L |
200 |
(392) |
400 |
(662) |
|
PTFE coating |
200 |
(392) |
260 |
(500) |
|
ECTFE coating |
100 |
(212) |
150 |
(302) |
|
PFA coating |
200 |
(392) |
260 |
(500) |
|
Hastelloy C4, mat. no. 2.4610 |
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) |
Maximum capillary length for diaphragm seals (guidance values)
|
Nominal diameter |
Max. length of capillary |
|||||
|---|---|---|---|---|---|---|
|
Diaphragm seal |
Clamp-on seal |
|||||
|
m |
(ft) |
m |
(ft) |
|||
|
DN 25 |
(1 inch) |
2,5 |
(8.2) |
2,5 |
(8.2) |
|
|
DN 32 |
(1 inch) |
2,5 |
(8.2) |
2,5 |
(8.2) |
|
|
DN 40 |
(1 inch) |
4 |
(13.1) |
6 |
(19.7) |
|
|
DN 50 |
(2 inch) |
6 |
(19.7) |
10 |
(32.8) |
|
|
DN 65 |
(2 inch) |
8 |
(26.2) |
10 |
(32.8) |
|
|
DN 80 |
(3 inch) |
10 |
(32.8) |
10 |
(32.8) |
|
|
DN 100 |
(4 inch) |
10 |
(32.8) |
10 |
(32.8) |
|
|
DN 125 |
(5 inch) |
10 |
(32.8) |
- |
- |
|
Response times
The values listed in the following table are the response times (in seconds per meter of capillary) for a change in pressure which corresponds to the set span.
The listed values must be multiplied by the respective length of the capillary, or with transmitters for differential pressure and flow by the total length of both capillaries.
The response times are independent of the set span within the range of the respective transmitter. The response times are of insignificant importance for spans above 10 bar (145 psi). The response times of the pressure transmitters are not considered in the table.
|
Filling liquid |
Density |
Temperature on capillary |
Response time in s/m (s/ft) with max. span of pressure transmitter |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
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) |
|||
|
Glycerin/water |
1,220 |
(0.044) |
+60 |
(140) |
0,13 |
(0.040) |
0,05 |
(0.015) |
0,02 |
(0.006) |
|
+20 |
(68) |
0,76 |
(0.232) |
0,32 |
(0.098) |
0,12 |
(0.037) |
|||
|
0 |
(32) |
9,72 |
(2.963) |
4,05 |
(1.234) |
1,51 |
(0.460) |
|||
Technical specifications of filling liquids
When selecting the filling liquid, check that it is suitable with respect to the permissible temperature of the medium and the process pressure.
Also check the compatibility of the filling liquid with the measured medium. For example, only physiologically harmless filling liquids may be used in the food industry.
Oxygen and chlorine are special cases of measured medium. The liquid must not react with either of these two media or a leaking remote seal may lead to an explosion or fire.
|
Filling liquid |
Digit in Order No. |
Permissible temperature of medium |
Density at 20 °C (68 °F) |
Viscosity at 20 °C (68 °F) |
Coefficient of expansion |
||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
pabs < 1 bar |
(pabs < 402 inH2O) |
pabs > 1 bar |
(pabs > 402 inH2O) |
||||||||
|
°C |
(°F) |
°C |
(°F) |
kg/dm3 |
(lb/in3) |
m2/s·106 |
(ft2/s·106) |
1/°C |
(1/°F) |
||
|
Silicone oil M5 |
1 |
-60 ... +80 |
(-76 ... +176) |
-90 ... +180 |
(-130 ... +356) |
0,914 |
(0.03) |
4 |
(43) |
0,00108 |
(0.00060) |
|
Silicone oil M50 |
2 |
-40 ... +150 |
(-40 ... +302) |
-40 ... +250 |
(-40 ... +482) |
0,96 |
(0.03) |
50 |
(538) |
0,00104 |
(0.00058) |
|
High-temperature oil |
3 |
-10 ... +200 |
(+14 ... +392) |
-10 ... +400 |
(+14 ... +752) |
1,07 |
(0.04) |
39 |
(420) |
0,00080 |
(0.00044) |
|
Halocarbon oil |
4 |
-40 ... +80 |
(-40 ... +176) |
-40 ... +175 |
(-40 ... +347) |
1,968 |
(0.07) |
14 |
(151) |
0,00086 |
(0.00048) |
|
Glycerin/water |
6 |
Not possible |
Not possible |
-10 ... +120 |
(+14 ... +248) |
1,22 |
(0.04) |
88 |
(947) |
0,00050 |
(0.00028) |
|
Food oil (FDA-listed) |
7 |
-20 ... +160 |
(-4 ... +320) |
-20 ... +200 |
(-4 ... +392) |
0,92 |
(0.03) |
10 |
(107) |
0,0008 |
(0.00044) |