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266CRH / 266CRT, 266CSH / 266CST MULTIVARIABLE PRESSURE TRANSMITTER | OI/266CXX/MODBUS-EN REV. A
7 Commissioning
Safety instructions
If there is a chance that safe operation is no longer possible,
take the device out of operation and secure it against
unintended startup.
General Notes
Once the pressure transmitter has been installed, it is put into
operation by switching on the operating voltage.
Prior to switching on the operating voltage check:
•
Process connections
•
Electrical connection
•
Complete filling of the impulse line and measuring
chamber of the measuring cell with the measuring
medium.
The transmitter can then be put into operation.
To do this, the valves must be actuated in the following order (in
home position, all valves are closed):
1. Open the shut-off valves on the pressure tap connection
(if present).
2. Open the pressure equalization valve of the valve block.
3. Open the shut-off valve of the high pressure side (H) on
the valve block.
4. Open the shut-off valve on the low pressure side (L) on
the valve manifold.
5. Close the pressure equalization valve.
Decommissioning is executed in the reverse sequence.
Note
If the output signal stabilizes only slowly, it is likely that a large
damping time constant has been set on the transmitter.
Zero point correction following installation
NOTICE
Material damage due to a magnetic field!
The use of magnetic screwdrivers results in damage of
components.
•
Do not use a magnetic screwdriver to operate the buttons.
Once the transmitter has been installed, it is advisable to check
the zero point and correct it if necessary.
1
2
1 Zero
2 Span
Figure 30: Operating buttons, write protection turn switch
A
B
3
M10761-01
3 Write protection switch
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