9
Display
Summary of function
'C - - P' Function of
P
push-button
The indicator may be configured to
display the input current in milliamps, or
the input current as a percentage of the
4/20mA input when the
P
push button
is operated in the display mode.
See section 5.8
'tArE'
Tare function
When enabled the tare function sets
the indicator display to zero when the
E
push button is operated in the display
mode.
See section 5.9
'CodE'
Security code
Defines a four digit numeric code that
must be entered to gain access to the
configuration menu. Default code 0000
disables this security function and
allows unrestricted access to all
conditioning functions.
See section 5.10
'rSEt'
Reset
Contains two sub-functions, ‘ConF’
which returns the indicator to the
default conditions shown in section 6.0
and ‘LtAb’ which returns the lineariser
to the default conditions shown in
section 7.3. To prevent accidental use
both resets must be confirmed by
entering ‘5urE’ before they will be
executed.
See section 5.11
5
.2 Indicator function: ‘FunC’
This configuration function defines the relationship
between the indicator’s 4/20mA input current and
the indicator’s display. Three alternatives are
available:
‘Std’
Standard linear relationship
‘root’
Square root extraction
‘Lin’
16 segment adjustable lineariser
To reveal the existing indicator function select
'FunC' from the configuration menu and press
P
.
If the function is set as required, press
E
to return
to the menu, or press the
▲
or
▼
button to change
the setting, followed by the
E
button to return to the
configuration menu.
‘Std’ Linear
Provides a linear relationship between the
4/20mA indicator input current and the
indicator display.
‘root’ Square root extraction
Primarily intended to linearise the square
law 4/20mA output from differential
flowmeters.
For reference, the following table shows
the output current from a non-linearised
differential flowmeter.
% of full flow Current output mA
2.5
4.01
10.0
4.16
25.0
5.00
50.0
8.00
75.0
13.00
100.0
20.00
When the root function is selected the
indicator will display flow in linear units.
‘Lin’
16 segment adjustable lineariser
Enables non-linear variables to be
displayed by the indicator in linear
engineering units. Use of the lineariser is
described in section 7 of this instruction
manual.
5.3 Resolution: rESn
This function defines the resolution of the least
significant display digit. Decreasing the display
resolution can improve the readability of a noisy
signal. Select ''rESn' from the menu and press
P
which will reveal the current display resolution. To
change the resolution press the
▲
or
▼
button to
select 1, 2, 5 or 10 digits, followed by the
E
button
to enter the selection and return to the
configuration menu.
