Use Of The Green Keys - Trim - Sensor Trimming Zero Align - ABB 691HT Operating Instructions Manual

S E N S O R T R I M , S E L E CT
T Y P E
FULL ZERO STAT
TRIM TRIM TRIM
A p p l y " z e r o "
p r e s s u r e i n p u t
A p p l i e d z e r o r e a d
[ 0 . 2 3 4 5 ] m m H 2 O
M a k i n g c h a n g e s
p e r m a n e n t
- - - P L E A S E W A I T - - -
A p p l i e d z e r o r e a d
[ 0 . 0 0 2 7 ] m m H 2 O
W A R N I N G - loop may be
returned to auto
T R I M M I N G A N D S E T U P
SNSR 4 - 20 LOOP
TR I M TR I M TEST
S E N S O R T R I M, S E L E C T
T Y P E
Z E R O
A L I G N
A p p l y 'z e r o'
S o u r c e i n p u t
A p p l i e d z e r o r e a d s
[ - 2 . 8 4 2 ] mV
- 38 -
Use of the Green Keys - TRIM - Sensor Trimming - ZERO TRIM
( for 600T, 600T EN and Deltapi K Pressure Transmitter)
Starting from the main display press the F1 key ( SNSR TRIM ) : the
following display will appear.
Pressing the F2 key ( ZERO TRIM ), the following message is displayed:
"WARNING - Control loop should be in manual - PROCEED".
Pressing the F4 key the following display appears :
If you are trimming a transmitter other than absolute pressure, the
atmospheric pressure can be taken as reference or the bypass opened
P R O
to equalize the pressure on both side of the sensor. Care should be paid
C E E D
to the absolute pressure transmitters where a vacuum reference should
be used or the actual atmospheric pressure taken into consideration.
After having applied the pressure press the F4 to PROCEED.The
T
following message appears: "Pressure stabilizing - PLEASE WAIT--
" and after some seconds the following display appears.
S E N D
The value of the pressure read by the transmitter is then displayed within
D A T A
square brackets: this value represents the zero shift due to mounting
position, ageing,etc. A blinking T in the upper right corner of the display
signals that the value is continuously updated. Pressing the F4 key the
T
displayed data are sent to the transmitter: the usual blinking T appears
in the upper right corner of the display signalling that a communication
is on course.
NOTE : Changes of more that 5% of the URL are not accepted. If this
limit is exceeded a message will be displayed ( see the relevant
T
section of this manual)
The zero trimming has been performed: the display shows the residual
zero error usually due to rounding in the Communicator operations.Small
E N D
differences, of the order of the 0.003% of the URV, on the reading, are
tolerated: if the difference appears too big repeat the zero trimming
procedure.
Pressing the F4 key ( END ) the warning message at side is displayed:
pressing PROCEED you will leave the zero trimming procedure.
PRO
CEED

Use of the Green Keys - TRIM - Sensor Trimming Zero Align

(for generic HART Transmitter)
Starting from the top display and selecting (SNSR TRIM) option using F1 key
RERAN
the SENSOR TRIM menu appears with the ZERO ALIGN option.
GING
Pressing F1 key a warning message is displayed: "WARNING - Control
loop should be in manual" with the label PROCEED for the key F4.
Pressing F4 to proceed the following desplay appears, giving indication of
applying input source. Press F4 again and wait for the input source reference
to stabilize as indicated on the display. Then, using F4 key (SENS DATA), the
P R O
value is sent to the device and used to trim the Primary Variable so that it
C E E D
reads Zero with the existing process applied to the device.
The resulting offset must be within limits defined by each transmitter. When
you press F4 the following message appears: "WARNING - Loop may be
returned to auto - PROCEED". Use F4 to continue and to return to the
S E N D
SENSOR TRIM menu.
D A T A