Commissioning - ABB 265GS Operating Instruction

Commissioning

6 Commissioning
Once the pressure transmitter has been installed, it is put into operation by switching on the
operating voltage.
Check the following before switching on the operating voltage:
• Process connections
• Electrical connection
• The impulse line and measuring chamber of the measuring equipment must be completely
filled with the measuring medium.
The transmitter can then be put into operation. To do this, the shut-off valves must be actuated
in the following order (in the default setting, all valves are closed):
1. Open the discharge shut-off valve, if present.
2. Open the shut-off valve.
To put the transmitter out of operation, carry out the steps in reverse order.
IMPORTANT (NOTE)
In the case of the pressure transmitter for absolute pressure with measuring ranges of
≤40 kPa absolute, please be aware that the measuring equipment will have been overloaded
by the atmospheric pressure due to the long periods of transport and storage involved. For this
reason, you will need to allow a starting time of approx. 3 hours after commissioning, until the
sensor has stabilized to such an extent that the specified accuracy can be maintained.
If, when using "intrinsically safe" transmitters, an ammeter is connected to the output circuit or a
modem is connected in parallel while there is a risk of explosion, the sums of the capacitances
and inductances of all circuits, including the transmitter (see EC-type-examination certificate)
must be equal to or less than the permissible capacitances and inductances of the intrinsically
safe signal circuit (see EC-type-examination certificate for the supply unit). Only passive or
explosion-proof devices or indicators may be connected.
If the output signal stabilizes only slowly, it is likely that a large damping time constant has been
set on the transmitter.
38 265Gx, 265Ax IM/265Gx/Ax-EN-07