Siemens SIPART Series Operating Instructions Manual page 117

When operating the positioner with natural gas, you must follow and adhere to the following
safety notes:
Operation with natural gas
1. Only the "Ex ia" version of the positioner and option modules with the "Ex ia" type of
2. Do not operate the positioner with natural gas in closed spaces.
3. Natural gas is continuously blown off in the servo-drive depending on the model. Special
4. The limit contact module may not be used when operating the positioner with natural
5. Depressurize the devices operated with natural gas adequately during maintenance
Note
Quality of natural gas
Only use natural gas which is clean, dry and free from additives.
Note
• During the initialization process, the operating pressure must be at least one bar more
• The transmission ratio selector can be set only when the positioner is open. Therefore,
General information about commissioning
After installing the positioner on a pneumatic actuator, you must supply electric and
pneumatic auxiliary power to it.
The positioner is in the "P manual mode" before initialization. At the same time, "NOINI"
blinks in the lower line of the display.
Adjust the positioner as per the respective actuator with the help of the initialization process
and by setting the parameters. If required, use the "PRST" parameter to cancel the
adjustment of the positioner on the actuator. The positioner is again in the "P manual mode"
after this process.
SIPART PS2 with and without HART
Operating Instructions, 10/2013, A5E00074631-11
WARNING
protection may be operated with natural gas. Positioners with other types of protection,
e.g. flameproof enclosure or versions for zones 2 and 22 are not permitted.
care must therefore be taken during maintenance activities near the positioner. Always
ensure that the immediate surroundings of the positioner are adequately ventilated.
The maximum values for ventilation are listed in section "Technical data for natural gas
as actuator medium (Page 243)".
gas.
activities. Open the cover in an explosion-free atmosphere and depressurize the device
for at least two minutes.
than that required to close or open the valve. However, the operating pressure should not
be greater than the maximum permissible operating pressure for the actuator.
check this setting before closing the enclosure.
Commissioning
7.1 Basic safety instructions
115