Siemens SITRANS DS III Series Compact Operating Instructions page 20

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
4.1.1 Unsuitable cables and/or cable glands
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.
● For the electrical connection, refer to the information in Chapter "Technical specifications (Page 36)".
WARNING
Improper power supply
Danger of explosion in hazardous areas as result of incorrect power supply, e.g. using direct current instead of alternating
current.
● Connect the device in accordance with the specified power supply and signal circuits. The relevant specifications can
be found in the certificates, in Chapter "Technical specifications (Page 36)" or on the nameplate.
WARNING
Unsafe extra-low voltage
Danger of explosion in hazardous areas due to voltage flashover.
● Connect the device to an extra-low voltage with safe isolation (SELV).
18
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 series (7MF4.33.. 7MF4.34.. 7MF4.35..)
A5E03434656-02, 12/2012