Siemens SITRANS P Brochure & Specs page 157

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.
Filling liquid Density
3
kg/dm
Silicone oil M5 0.914
Silicone oil M50 0.966
High-temperature oil 1.070
Halocarbon oil 1.968
Food oil (FDA listed) 0.920
Glycerin/water 1.220
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.
Filling liquid Digit in Permissible temperature of medium
Order
No.
p <
abs
1 bar
°C
Silicone oil M5 1 -60 ... +80
Silicone oil M50 2 -40 ... +150 (-40 ... +302) -40 ... +250 (-40 ... +482)
High-tempera- 3 -10 ... +200 (+14 ... +392) -10 ... +350 (+14 ... +662) 1.07
ture oil
Halocarbon oil 4 -40 ... +80
Glycerin/water 6 Not possi-
ble
Food oil (FDA 7 -20 ... +160 (-4 ... +320)
listed)
© Siemens AG 2008
SITRANS P measuring instruments for pressure
Remote seals for transmitters and pressure gages
Temperature Response time in s/m (s/ft) with max. span of pressure transmitter
on capillary
3
(lb/in ) °C (°F) 250 mbar
(0.033) +60 (140) 0.06
+20 (68) 0.11
- 20 (-4) 0.3
(0.035) +60 (140) 0.6
+20 (68) 0.61
- 20 (-4) 1.69
(0.039) +60 (140) 0.14
+20 (68) 0.65
-10 (14) 3.96
(0.071) +60 (140) 0.07
+20 (68) 0.29
- 20 (-4) 2.88
(0.033) +60 (140) 0.75
+20 (68) 4
- 20 (-4) 20
(0.044) +60 (140) 0.13
+20 (68) 0.76
0 (32) 9.72
(p < p >
abs abs
14.5 psi) 1 bar
(°F) °C
(-76 ... +176) -90 ... +180 (-130 ... +356) 0.914
(-40 ... +176) -40 ... +175 (-40 ... +347)
Not possible -10 ... +120 (+14 ... +248) 1.22
-20 ... +200 (-4 ... +392)
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.
(3.63 psi) 600 mbar
(0.018) 0.02
(0.034) 0.02
(0.091) 0.12
(0.183) 0.25
(0.186) 0.26
(0.515) 0.71
(0.043) 0.06
(0.198) 0.27
(1.207) 1.65
(0.021) 0.03
(0.088) 0.12
(0.878) 1.2
(0.229) 0.33
(1.220) 1.75
(6.100) 8.5
(0.040) 0.05
(0.232) 0.32
(2.963) 4.05
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.
Density at Viscosity at
20 °C (68 °F) 20 °C (68 °F)
(p >
abs
14.5 psi)
3 3
(°F) kg/dm (lb/in ) m
(0.03) 4
0.96 (0.03) 50
(0.04) 39
1.968 (0.07) 14
(0.04) 88
0.92 (0.03) 10
Technical description
(8.7 psi) 1600 mbar (23.2 psi)
(0.006) 0.01 (0.003)
(0.006) 0.02 (0.006)
(0.037) 0.05 (0.015)
(0.076) 0.09 (0.027)
(0.079) 0.1 (0.030)
(0.216) 0.27 (0.082)
(0.018) 0.02 (0.006)
(0.082) 0.1 (0.030)
(0.503) 0.62 (0.189)
(0.009) 0.01 (0.003)
(0.037) 0.05 (0.015)
(0.366) 0.45 (0.137)
(0.101) 0.17 (0.052)
(0.534) 0.67 (0.204)
(2.593) 3.25 (0.991)
(0.015) 0.02 (0.006)
(0.098) 0.12 (0.037)
(1.234) 1.51 (0.460)
Coefficient of expan-
sion
2 6 2 6
/s 10 (ft /s 10 ) 1/°C (1/°F)
(43) 0.00108 (0.00060)
(538) 0.00104 (0.00058)
(420) 0.00080 (0.00044)
(151) 0.00086 (0.00048)
(947) 0.00050 (0.00028)
(107) 0.00080 (0.00044)
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