Sitrans p measuring instruments for pressure, Remote seals for transmitters and pressure gages, Technical description 2/157 – Siemens SITRANS P User Manual
Page 157
SITRANS P measuring instruments for pressure
Remote seals for transmitters and pressure gages
Technical description
2/157
Siemens FI 01 · 2009
2
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 in-
significant importance for spans above 10 bar (145 psi). The re-
sponse times of the pressure transmitters are not considered in
the table.
Technical data of filling liquids
When selecting the filling liquid, check that it is suitable with re-
spect to the permissible temperature of the medium and the pro-
cess pressure.
Also check the compatibility of the filling liquid with the mea-
sured 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 leak-
ing remote seal may lead to an explosion or fire.
Filling liquid
Density
Temperature
on capillary
Response time in s/m (s/ft) with max. span of pressure transmitter
kg/dm
3
(lb/in
3
)
°C
(°F)
250 mbar
(3.63 psi)
600 mbar
(8.7 psi)
1600 mbar
(23.2 psi)
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)
Filling liquid
Digit in
Order
No.
Permissible temperature of medium
Density at
20 °C (68 °F)
Viscosity at
20 °C (68 °F)
Coefficient of expan-
sion
p
abs
<
1 bar
(p
abs
<
14.5 psi)
p
abs
>
1 bar
(p
abs
>
14.5 psi)
°C
(°F)
°C
(°F)
kg/dm
3
(lb/in
3
) m
2
/s
⋅10
6
(ft
2
/s
⋅10
6
) 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-tempera-
ture oil
3
-10 ... +200 (+14 ... +392) -10 ... +350 (+14 ... +662)
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 possi-
ble
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)
0.00080
(0.00044)
© Siemens AG 2008