BEKA BA564G, Manual, Page: 36 / 38

9.5 4/20mA output
The BA564G Counter can be supplied with an
optional factory fitted galvanically isolated 4/20mA
output which may be configured to represent the rate
or total display.
9.5.1 System design
The Counter’s optional 4/20mA output is a passive
current sink i.e. not powered, but it is totally isolated
from all other Counter circuits. It is effectively a
2-wire 4/20mA transmitter requiring a minimum supply
of 5V with the output current controlled by the
Counter’s rate or total. Terminals C1 and C2 may be
connected to any other instrument with a 4/20mA
transmitter input with at least a 5V output as shown in
Fig 14. Terminals C2 and C4 are internally linked and
may be used for joining a return 4/20mA wire.
Fig 14 Application of 4/20mA output
9.5.2 Configuration and calibration
When a BA564G Counter is supplied with an optional
4/20mA output the configuration menu is extended as
shown in Fig 18. The 4/20mA output sub-menu is
accessed via the
4-20 oP
function.
The 4/20mA output sub-menu allows the 4/20mA
output to be controlled by the rate or the total display.
9.5.3 Access 4/20mA output sub-menu:
4-20 oP
Access the BA564G Counter configuration menu
as described in section 5.2. Using the
&
and
*
push buttons scroll though the menu until
4-20 oP
is displayed, pressing
(
will then access the
4/20mA output sub-menu which is shown in Fig 15.
Fig 15 4/20mA output configuration sub-menu
9.5.4 Enable 4/20mA output:
EnbL
This function allows the 4/20mA output to be
enabled or disabled without altering any of the
4/20mA output parameters. Using the
&
or
*
push button select
EnbL
in the
4-20 oP
sub-menu
and press
(
to reveal the existing setting
on
or
oFF
. The function can be changed by pressing the
&
or
*
push button followed by the
)
button to
return to
EnbL
prompt.
Note: When the 4/20mA output is disabled by
selecting
oFF
, the output is a constant
3.5mA irrespective of the instrument
display.
9.5.5 Select rate or total source:
4-20tYPE
The 4/20mA output current can represent the
BA564G Counter’s rate or total display and this
should be defined before any other 4/20mA current
output functions are configured.
Using the
&
or
*
push button select
4-20tYPE
in
the 4/20mA output sub-menu and press
(
to
reveal the existing setting
totAL
or
rAtE
. The
function can be changed by pressing the
&
or
*
push button followed by the
)
button to return to
4-20tYPE
prompt.
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