Siemens SIPART Series Operating Instructions Manual page 245

12.7 Technical data for natural gas as actuator medium
Introduction
Note when using an actuator with natural gas that this can escape at the following points:
● At the exhaust air outlet with a sound absorber at the bottom of the device.
● At the enclosure ventilation at the bottom of the device.
● At the control air outlet near the pneumatic connections.
Please refer to the following table for the maximum bleeding values.
Maximum values for escaping natural gas
Bleeding process
Ventilation of enclosure volume via bottom of
device. Purge air switch is at "IN":
Bleed through the control air outlet near the
pneumatic connections:
Ventilation via the exhaust air outlet with a
sound absorber at the bottom of the device
Volume
1) Depending on the actuating pressure and volume of the actuator as well as the frequency of
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
Note
Exhaust air outlet with a sound absorber at the bottom of the device
The positioner is delivered as standard with a sound absorber at the bottom of the device.
To provide an outlet for the exhaust air, replace the sound absorber by a G¼ pipe
coupling.
Enclosure ventilation and control air outlet
Enclosure ventilation and control air outlet cannot be collected and channeled off.
control. The maximum flow rate is 470 Nl/min at a differential pressure of 7 bar.
12.7 Technical data for natural gas as actuator medium
Operating
mode
Operation,
typical
Operation,
max.
Error case,
max.
Operation,
typical
Operation,
max.
Error case,
max.
Operation,
max.
Error case,
max.
Max. [l]
Technical data
6DR5.1.-.E... 6DR5.2.-.E...
Single-acting Double-acting
[Nl/min] [Nl/min]
0.14 0.14
0.60 0.60
60.0 60.0
1.0 2.0
8.9 9.9
66.2 91.0
358.2 339
1)
1.26 1.23
1),
243