23
6.7
32-Point Linearisation Curve
P47: - - - a Linearisation
a
Linearisation
0
OFF (FACTORY DEFAULT)
1
ON
P48:
Linearisation table
Linearisation is the method of assigning (calibrated or calculated) level, volume or flow to values measured by the
transmitter. It can be used eg if the sound velocity is unknown (LEVEL
⇒
LEVEL) or in case of a vertical cylindrical tank
(LEVEL
⇒
VOLUME) etc. Data-pairs of the linearisation table are handled in a 2x32 matrix, consisting of two columns.
Left column “
L”
Right column “
r”
LEVEL measured
LEVEL or VOLUME or
FLOW to be transmitted and
displayed
The left column values (indicated on the display as “
L
”) contains the measured LEVEL values.
The right column values (indicated on the display as “
r
”) contains the calibrated values and are interpreted according to the
selected measurement value in
P01(a)
.
yy
M
xxxx
48
:
_ _XX
ENTER
(Enter table)
r
M
xxxx
ENTER
UP, DOWN
yy
M
xxxx
NEXT+DOWN
(Load a "0" to close table)
UP + DOWN
(Copy present measurement)
L
M
xxxx
ENTER
ENTER+DOWN
(Exit table)
ENTER+UP
(Copy value of previous address)
NEXT+UP
(Cancel modification, of this data)
Left
column
UP, DOWN, NEXT
(Enter values)
ENTER
Right
column
LEVEL
LEVEL
VOLUME
FLOW
Number of
programmed data
pairs in the table
Address
(Serial number)
of the data pair
Measurement
value
to be transmitter
and displayed
Conditions of correct programming of the data pairs
Left column “
L
”
Right column “
r
”
L
(1)= 0
r
(1)
L
(i)
r
(i)
:
:
L
(j)
r
(j)
The table must always start with: L(1)= 0 and r(1)= value (assigned to 0 level)
The table must be ended either with the 32. data pair i.e. j=32
Or if the linearisation table contains less than 32 data-pairs j<32, the table must be closed by a level value “0” e.g.
L
(j<32)= 0.
The Echotel will ignore data after recognising level value “0” with serial number other than “1”.
If the above conditions are not met, error codes will be displayed (see chapter: Error Codes).
6.8
Informational Parameters
P60: (h)
Overall operating hours of the unit
Indication varies according to the elapsed time:
Operating hours
Indication form
0 to 999.9h
xxx,x
1000 to 9999h
xxxx
Over 9999h
X,xx: e meaning x,xx 10
e
P61: (h)
Time elapsed after last switch-on
- indication as in P60
P62: (h)
Operating hours of the relay
- indication as in P60
P63:
Number of switching cycle of the relay
- indication as in P60
P64: (°C/°F) Actual temperature of the transducer
P65: (°C/°F) Maximum temperature of the transducer
P66: (°C/°F) Minimum temperature of the transducer
In case of a breaking in the temperature measuring Pt10 element „PtErr” will be displayed (See Chapter 7). The transmitter
will perform temperature correction corresponding to 20ºC.