
GASMAX CX Operation & Maintenance Manual, Revision 1.0
Page 21
CONNECTING
AN
EXTERNAL
4
‐
20MA
INPUT
DEVICE
The
GASMAX
CX
supports
two
general
purpose,
non
‐
isolated
4
‐
20mA
inputs
as
shown
below.
The
amount
of
voltage
and
current
available
for
the
remote
4
‐
20mA
device
is
determined
by
the
GASMAX
DC
supply
connected
to
TB1.
Both
channels
support
local
calibration
if
necessary;
if
the
devices
are
pre
‐
calibrated,
or
are
calibrated
at
the
source,
the
calibration
feature
on
each
channel
can
be
disabled.
Figure 4-12: Remote 4-20mA Input
CO
M
42
0
OU
T
2
42
0
OU
T
1
PW
R
R/
P
W
R
C/
4
20
IN
1
A/
C
O
M
42
0
IN
2
CH
1
CH
2
E
‐
NE
T
LOCAL
SENSOR
TO DISPLAY
OUTPUT:
TB1
–
1:
+24VDC
Input
TB1
–
2:
Channel
1
4
‐
20mA
Out
TB1
–
3:
Channel
2
4
‐
20mA
Out
TB1
–
4:
Power
/
Signal
Common
INPUT:
TB2
–
1:
+24VDC
Excitation
Out
TB1
–
2:
Channel
1
4
‐
20mA
Input
TB1
–
3:
Common
TB1
–
4:
Channel
2
4
‐
20mA
Input