Installation
Terminal Connections (
continued
)
TB1 contains the connections for Power, Re-
mote Functions, and Output Signal (see figure
7, CE Mark units see figure 21).
TB1 position
Function
1
4-20mA Output
2
Calibration Switch
3
Calibration Switch
4
LED
5
LED
6
Common (Ground)
7
+24VDC Power
NOTE:
Contact with PCB components
should be avoided to prevent damage by
static electricity.
All wire connections are
made to the Terminal Blocks.
It is recommended that three wire (red, black,
white) shielded cable be used for making
power and output signal connections on the
Model S104. The terminal block accepts 16
AWG to 22 AWG stranded or solid wire.
Each wire should be stripped before wiring
the Model S104 Combustible Gas Enhanced
Smart Sensor. To connect wiring to the ter-
minal block, insert a screw driver into the or-
ange tab and press down (figure 8), opening
the terminal.
figure 8
Insert the wire into the terminal and release
the orange tab, clamping the wire in the termi-
nal. Check the connection by GENTLY tug-
ging the wire to ensure it is locked in.
figure 9
NOTE: 14 AWG wire can be used if it is
carefully stripped (figure 9).
A 4 to 20mA output signal is provided by the
Model S104 Combustible Gas Enhanced
Smart Sensor and can be sent up to 9000 feet
(2740 meters) to a General Monitors read-
out/relay display module, industrial analog to
digital converter, computer based monitor,
PLC, DCS, etc. The 4 to 20mA signal pro-
vides for control room or other locations re-
mote to the Model S104 to display indications
of operation and alarm conditions.
To connect the 4 to 20mA output signal with
another unit, connect the white wire into TB1,
position 1 (CE Mark units - TB3, position 1),
labeled 4-20 mA OUT.
For making output
signal connections to display devices, refer to
the specific manual for that device (figure 10).
figure 10
GENERAL MONITORS
Model S104
8
