Detcon FP-100 - Manual (Page 15)

Model FP-100
FP-100 Instruction Manual Rev. 0.0 Page 11 of 30
3. Observing correct polarity, terminate the 3-conductor power and 4-20mA field wiring (‘+’ ‘-‘ and ‘mA’) at
the terminal board connector J1 (4-20mA Out) on the Standard Terminal Board shown in Figure 8, or J7
(PWR GND and MA) on the Display Terminal Board shown in Figure 9.
NOTE: Connections on the Display Terminal Board are clamp type, and require a small
screwdriver or insertion tool to actuate the clamp that holds the wire.
4. Trim and cap all exposed wire leads if they are not permanently landed in the terminal board.
5. The sensor should be connected to J2, labeled “SENSOR”, on the Standard Terminal Board, and J6,
labeled “SENSOR”, on the Display Terminal Board. On the Standard Terminal Board, the wiring from
the sensor should match the silkscreen on the terminal board: R–Red, BK–Black, GN-Green, BU–Blue,
and W–White. On the Display Terminal Board the wiring should be: Red-PWR, Black-GND, White-A,
Blue-B (Green is not connected).
6. On the Display Terminal Board other connectors are provided for factory installed options. The options
ordered will dictate if, and what connectors are used. The display option is plugged into the Beau
connector (J3) for a FP-100 with just the display option added. Other options are covered in the associated
manual for those options.
7. If a display was removed in step 2, re-install the display by plugging it back into the terminal board.
8. Replace the junction box cover after Initial Start Up.
NOTE: A 6-32 or 8-32 threaded exterior ground point is provided on most junction boxes for
an external ground. If the Sensor Assembly is not mechanically grounded, an external ground
strap must be used to ensure that the sensor is electrically grounded.
2.6.1 Model 100 Display Terminal Board Settings
The Model 100 Display Terminal Board contains a jumper that must be configured properly for the board to
operate properly. The jumper is normally configured at the factory and should not be changed. Misplacement
of the jumper may cause the sensor to become inoperative.
Table 1 Model 100 Terminal Board Jumper
JP1 1-2 – Battery installed 2-3 – Display only
2.7 Initial Start Up
2.7.1 Combustible Gas Sensors
Upon completion of all mechanical mounting and termination of all field wiring, apply system power in the
range of 11-26VDC (24VDC typical) and observe the following normal conditions:
1. If the 100 Series Display option is installed, the display should read 0.0 upon power up. If a Display is
not installed, set a DVM to measure millivolts, and connect it between TP1 and TP2 on the standard
terminal board. The DVM will read the voltage drop across a 10Ω resistor. The resistor develops a
10mV voltage drop per 1mA of current. Thus a reading of 40mV on a DVM equals 4mA of current.