numbered from left to right:
•
Sockets 1 (Common)
,
2 (NC)
, and
3 (NO)
are the connections for
Limit
Relay A
.
•
Sockets 4 (Common)
,
5 (NC)
, and
6 (NO)
are for
Limit Relay B
.
•
Sockets 7 (Common)
,
8 (NC)
, and
9 (NO)
are for
Warning Relay
.
•
Sockets 10 (Common)
,
11 (NC)
, and
12 (NO)
are for
System OK
.
6) An analog output for the carbon dioxide sensor and an additional analog output
for the oxygen sensor are available from the terminal block. These outputs are
non-isolated current sources that are referenced to the current output ground.
The range of each current output is 4 to 20 mA and a maximum output voltage
of 10 Volts. The oxygen and carbon dioxide concentrations that are equal to the
outputs at 4 mA and 20 mA are normally set to the low and high limits of the
sensitivity ranges of the two gases, respectively: For example, the 4 mA current
output of the oxygen sensor is set to 0%, and the 20 mA current output is set to
100%.
•
Socket 13 is the
Ground
for the both current outputs.
•
Socket 14 is the
oxygen current output
.
•
Socket 15 is the
carbon dioxide current output
.
GA-200B: Rear Panel
GA-200B Rear Panel
The rear panel of the GA-200B has the following features: a switch, a power input,
an RS-232 serial port for direct connection to a computer, an oxygen sensor
output, a carbon dioxide sensor output, and a gas outlet.
1) Power for the GA-200B is supplied by an external power supply. The power
supply is connected to the unit through the connector labeled
12V
,
1.5A
. Press
the side of the power switch labeled
I
to turn on the GA-200B. Press
O
on the
switch when it is time to turn the unit off.
2) The GA-200B can be interfaced to a computer through a serial (
RS-232
) data
stream. The default data format is
9600 baud
,
8 bit
, and
no parity
with
alternate baud rates of 2400, 4800, 19200, and 38400. The signals present are
RXD
,
TXD
, and ground through the 9-pin D connector on the back panel of the
unit.
GA-200 Gas Analyzer
iWorx Systems, Inc.
www.iworx.com
