Siemens SITRANS P Manual do Utilizador descarregar pdf (Página 168)

Model Designations and Specifications UMSITRPDS3-1

November 2010

9-10

TABLE 9-4 Model 7MF4233, Specifications

Input

Measured variable Absolute pressure (gage construction)

Span (infinitely adjustable) Span Max. permissible test pressure

8.3 to 250 mbar a (0.12 to 3.6 psi a) see Note 6 bar a (87 psi a)

43 to 1300 mbar a (0.62 to 18.9 psi a) 10 bar a (145 psi a)

160 to 5000 mbar a (2.32 to 72.5 psi a) 30 bar a (435 psi a)

1 to 30 bar a (14.5 to 435 psi a) 100 bar a (1450 psi a)

Lower measuring limit

• Measuring cell, silicone oil filling 0 mbar a (0 psi a)

Upper measuring limit 100% of maximum span

Output

Output signal 4 to 20 mA

• Lower limit (infinitely adjustable) 3.55 mA, factory preset to 3.84 mA

• Upper limit (infinitely adjustable) 23 mA, factory preset to 20.5 mA or optionally set to 22.0 mA

Load

• Without HART communication R

≤ (U

– 10.5 V)/0.023 A in Ω; U

: power supply in V

• With Hart communication R

= 230 to 500 Ω (SIMATIC PDM) or

= 230 to 1100 Ω (HART Communicator)

Accuracy

To EN 60770-1

Reference Conditions Increasing characteristic, start of scale value 0 bar, stainless steel seal diaphragm,

silicon oil filling, temperature 25°C (77°F) r: span ratio (r = max. span/set span)

Error in measurement and fixed-point

setting (including hysteresis and

repeatability)

• Linear characteristic

- r ≤ 10 ≤ 0.1%

- 10 ≤ r < 30 ≤ 0.2%

Long-term drift (temperature change

+/-30°C (+/-54°F))

≤ (0.1 * r)%/year

Influence of ambient temperature

• at -10 to +60°C (14 to +140°F) ≤ (0.1 * r + 0.2)%

• at -40 to -10°C and +60 to +85°C (-40

to +14°F and 140 to +185°F)

≤ (0.1 * r + 0.15)%/10K

Rated operating conditions

Degree of protection (to EN 60529) IP65

Process temperature

• Measuring cell, silicon oil filling -40 to +100°C (-40 to +212°F)

• Measuring cell, inert filling liquid -20 to +100°C (-4 to +212°F)

• In conjunction with dust explosion

protection

-20 to +60°C (-4 to +140°F)

Ambient conditions

• Ambient temperature, digital indicators -30 to +85°C (-22 to +185°F)

• Storage temperature -50 to +85°C (-58 to +185°F)

• Climatic class, condensation Permissible

• Electromagnet compatibility To EN 61326 and NAMUR NE 21

Design

Weight, approximate, without options 1.5 kg (3.3 lb)

Housing material Low copper die-cast aluminum, GD-AISi 12 or stainless steel precision casing, mat.

No. 1.4408

Wetted parts materials

• Connection shank Stainless steel, mat. No. 1.4404/316L or Hastelloy C4, mat. No. 2.4610

• Oval flange Stainless steel, mat. No. 1.4404/316L

• Seal diaphragm Stainless steel, mat. No. 1.4404/316L or Hastelloy C276, mat. No. 2.4819

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