Siemens P 157, Response times, Technical data of filling liquids, On capillary

© Siemens AG 2008

SITRANS P measuring instruments for pressure

Remote seals for transmitters and pressure gages

Technical description

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.

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Filling liquid	Density		Temperature		Response time in s/m (s/ft) with max. span of pressure transmitter
			on capillary
	kg/dm3	(lb/in3)	°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)

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	Digit in	Permissible temperature of medium								Density at		Viscosity at		Coefficient of expan-
	Order									20 °C (68 °F)		20 °C (68 °F)		sion
	No.
		pabs <		(pabs <		pabs >		(pabs >
		1 bar		14.5 psi)		1 bar		14.5 psi)
		°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-tempera-	3	-10 ...	+200	(+14 ...	+392)	-10 ...	+350	(+14 ...	+662)	1.07	(0.04)	39	(420)	0.00080	(0.00044)
ture oil
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-		Not possible		-10 ...	+120	(+14 ...	+248)	1.22	(0.04)	88	(947)	0.00050	(0.00028)
		ble
Food oil (FDA	7	-20 ...	+160	(-4 ...	+320)	-20 ...	+200	(-4 ...	+392)	0.92	(0.03)	10	(107)	0.00080	(0.00044)
listed)

Siemens FI 01 · 2009

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