Wet Ranging Operation - Sw 3 = 1; Pv Scaling Operation - Sw 3 = 0 - ABB 266FF Operating Instructions Manual

9.2.1 Wet Ranging operation – SW 3 = 1
The Z (Zero) button performs the 'Lower Range Setting'
operation and sets as 0% the actual measured pressure value
After the 'Z' button is kept pushed for more than 2 seconds,
when released, the pressure value measured in input is written
in the PRTB_PRIMARY_VALUE_RANGE_0%.
The PRTB_PRIMARY_VALUE_RANGE_100% is shifted in
order to keep the same SPAN
Before:
— Span = (PRTB_PRIMARY_VALUE_RANGE_100%
- PRTB_PRIMARY_VALUE_RANGE_0%)
After:
— PRTB_PRIMARY_VALUE_RANGE_0% =
PRTB_CAL_VALUE
— PRTB_PRIMARY_VALUE_RANGE_100% =
SPAN + PRTB_ PRIMARY_VALUE _RANGE_0%
The S button performs the 'Upper Range Setting' operation
and sets as 100% of the calibration scale the actual measured
pressure value. After the 'S' button is kept pushed for more
than 2 seconds, when released, the pressure value measured
in input is written in the PRTB_PRIMARY_VALUE_
RANGE_100%. The SPAN changes as consequence.
— PRTB_PRIMARY_VALUE _RANGE_100% =
PRTB_ CAL_VALUE
9.2.2 PV Scaling operation – SW 3 = 0
The Z button performs the 'ZERO elevation/suppression'
operation. After the 'Z' button is kept pushed for more than 2
second, when released, the PTRB_PRIMARY_VALUE is
zeroed.
The zeroing is achieved by an internal writing of 0.0 in the
PTRB_DESIRED_ PRIMARY_VALUE. The difference between
PTRB_DESIRED_PRIMARY_VALUE and the PTRB_CAL_
VALUE is written in the PTRB_BIAS_VALUE.
— PTRB_BIAS_VALUE =
(PRTB_CAL_VALUE
- PRTB_DESIRED_PRIMARY_VALUE)
The PTRB_BIAS_VALUE (positive or negative) is added in the
calculation algorithm at the PTRB_CAL_VALUE for the
production of the PTRB_PRIMARY_VALUE.
— PTRB_PRIMARY_VALUE =
(PRTB_CAL_VALUE + PRTB_BIAS_VALUE)
The S button (3) performs the 'Reset ZERO elevation/
suppression' operation. After the 'S' button is kept pushed for
more than 1 second, when released, the PTRB_BIAS_VALUE
is reset to Zero eliminating in this way any effect of elevation or
suppression for the PTRB_PRIMARY_VALUE that, after this
operation, returns to produce again the same value of the
PTRB_CAL_VALUE.
— PTRB_BIAS_VALUE = 0.0
— PTRB_PRIMARY_VALUE = PTRB_CAL_VALUE
Important. Should you need more details about the above
mentioned FF commands, please refer to the addendum of this
manual, downloadable from ABB website www.abb.com/pressure
2600T Series Pressure transmitters | OI/266/FF-EN Rev. B 35
9 Local pushbuttons