Siemens SITRANS P DS III Kompaktbetriebsanleitung Seite 22

When taking measurements in a closed container with strong condensate formation, you must fill the negative pressure line
(mostly with the condensate of the measured medium) and install a condensate pot. You can cut off the device using the
dual pneumatic block 7MF9001-2.
Measurement assembly on a closed container (strong condensate formation)
h Lower filling level
U
h Upper filling level
O
h Gland distance
V
p Pressure
The process connection on the negative side is a female thread
Lay the line for the negative pressure using a seamless steel tube 12 mm x 1.5 mm.
4 Connecting
4.1 Basic safety instructions
WARNING
Unsuitable cables and/or cable glands
Danger of explosion in hazardous areas.
Only use suitable cables and cable glands complying with the requirements specified in Chapter "Technical data
•
(Page 36)".
Tighten the cable glands in accordance with the torques specified in Chapter "Technical data (Page 36)".
•
When replacing cable glands use only cable glands of the same type.
•
After installation check that the cables are seated firmly.
•
WARNING
Hazardous contact voltage in versions with 4-conductor extension
Danger of electrocution in case of incorrect connection.
Observe the instructions in the 4-conductor extension operating manual for the electrical connection.
•
20
Formula:
Start-of-scale value:
Δp
Full-scale value:
Δp
Δp Start of scale value
MA
Δp Full-scale value
ME
ρ Density of the measured medium in the container
ρ ' Density of fluid in the negative pressure line
corresponds to the prevailing temperature there
g Acceleration due to gravity
/ -18 NPT or an oval flange.
1
4
SITRANS P DS III/P410 (7MF4.33.. 7MF4.34.. 7MF4.35..)
= g · (h · ρ- h · ρ')
MA U V
= g · (h · ρ- h · ρ')
MA O V
A5E03434626-04, 05/2015