Correction Of The Mounting Position - ABB 266 Operating Instruction

(Gauge & Absolute models) 266Gx, 266Ax, 266Hx, 266Nx, 266Px, 266Vx, 266Rx
– Open the shut-off valve on the pressure tap connection (if present).
– Open the positive shut-off valve.
To put the transmitter out of operation, carry out the steps in reverse order.
Important
In case of the 266 transmitter for absolute pressure (266Vx, 266Rx, 266Ax and 266Nx) with a measuring range less than or equal 650 mbar abs., 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. 30 minutes for 266Vx, 266Rx and 266Nx models and 3 hours for 266Ax models after
commissioning, until the sensor has stabilized to such an extent that the specified accuracy can be maintained.

Correction of the mounting position

During installation of the transmitter, zero shifts caused by mounting (e.g., a slightly oblique mounting position due to a remote seal,
etc.) may occur; these must be corrected.
Important
The transmitter must have reached its operating temperature (approx. 5 min. after startup, if the transmitter has already reached the ambient temperature).
This correction can be executed only if the Calibration Lower Range value is 0.0 and must be made with process (dp or p) = 0.
The correction consists in the Zero elevation/suppression operation and can be done in two ways:
– Locally by acting on the Z push button when the electronic switch SW 3 is set to 0
– From remote station via FF communication writing 0.0 in the PTRB_DESIRED_PRIMARY_VALUE
In case the Calibration Lower Range value is not 0.0 then the correction cannot be made with the local Z push button but it can be
done in the following way:
– From remote station via FF communication writing the correct measure value in the PTRB_DESIRED_PRIMARY_VALUE
Important
After the above operations the Calibration Range Values are not changed. The desired process output value is produced through an internal calculation by
applying an offset at the measured value
2600T Series Pressure transmitters | OI/266/FF/ADD-EN Rev. B 85