P29 Instruction Manual
9
Start-up, maintenance, shipping
Caution: Explosion hazard! Flush the system for the required period of time before
start-up!
3.1 Start-up
Carefully read and follow the start-up instructions listed below. Failure to follow these
instructions can lead to an explosion in the instrument and injury to persons.
Installation and start-up of the instrument may only be performed by persons trained
in handling equipment in areas with explosion hazards.
The instrument must be separated from the electrical power supply during the following steps:
Install the instrument in the system (
only outside potentially explosive atmosphere
) -
do
not
connect to the gas line
at this time
.
Install all connecting electrical cables (powerless) in the instrument
Test the functions
o
Check
the
flow
between
plus
and
minus
pressure
connection
(check the preflush function)
o
Apply supply voltage
o
Briefly check pressure measurement function
o
Switch supply off again
Tighten high strength cable glands
Unused high strength cable glands must be sealed
Close the housing
Before connecting the instrument to the gas lines, both pressure lines should be flooded
with gas otherwise the instrument itself must be flooded with gas for a longer period of time.
Appropriate equipment must be installed for this purpose
Flushing process
o
Close gas supply lines
o
Attach both pressure connections
o
Tighten the terminals on the gas supply lines and check them
o
Approve gas supply lines for use
o
Flood the device with gas for at least 6 minutes when it is switched off. To do
this, there must be a differential pressure at the pressure connections. Notice
the maximum system pressure
o
Only then may the electrical power supply to the instrument be switched on again
This start-up regulation has the purpose of flushing the oxygen required for combustion out of
the instrument so that only a pure gaseous atmosphere is present. This gas atmosphere
cannot ignite because no oxygen is present. This entire start-up procedure must be repeated
if the instrument is separated from the gas supply line even for only a short period of time.
Consequently, both pressure ports must be connected to the pressurized system during
operation.
The device may not be used in systems with natural gas unless this startup
regulation is observed.