UTC Fire and Security Det-Tronics R8471B Instructions Manual page 7

Figure 4—Controller Front Panel
The alarm LEDs flash when the setpoint is
exceeded and are on steady (until reset) when
the H S level drops below the setpoint, whether
2
the corresponding alarm output is latching or non-
latching.
6. CAL LED – Illuminated while the controller is in
the calibrate mode.
In the Setpoint Display or Setpoint Adjust mode, a
flashing alarm LED identifies the particular setpoint
currently being indicated on the digital display. A
flashing CAL LED indicates that the programmed
calibration gas concentration in ppm is currently
being shown on the digital display.
7. FAULT LED – Flashes upon detection of a system
fault and is on steady during the power-up time
delay.
8. RESET Pushbutton – Used for various system
programming and calibration functions as well as
for resetting the controller.
9. SET Pushbutton – Used for various system pro-
gramming and calibration functions.
2.1
NOTE
NOTE
Setpoints
The R8471B Controller has independent Low, High,
and Auxiliary alarm setpoints, with corresponding
outputs.
The programmed calibration gas concentration in
ppm is also displayed and adjusted with the alarm
setpoints. This value must be equal to the ppm
concentration of the calibration mixture that is used
for the span adjustment.
The adjustment range in ppm is:
Range: 0 to 100
Low alarm: 5 to 40
High alarm: 10 to 60
Aux. alarm: 5 to 99
Cal. gas: 30 to 99
The alarm setpoints and calibration gas concentration
can be checked by pressing the RESET pushbutton
located on the front panel of the controller. See
"Setpoint Adjustment" and "Calibration" sections of
this manual for additional information.
Outputs
The R8471B Controller is available in a Base version
and a Premium version. The differences between
the two models are the output configuration and
programming options.
BASE MODEL
The base controller is furnished with open collector
transistor outputs (rated 100 milliamperes at 32 volts
dc) for the Low alarm, High alarm, Auxiliary alarm,
and Fault circuits. The normally de-energized alarm
outputs are energized when their corresponding
setpoints are exceeded. The fault output is normally
energized and becomes de-energized upon detection
of a system fault. The low alarm, auxiliary alarm, and
fault outputs are non-latching. The high alarm output
is latching.
PREMIUM MODEL
The premium model is furnished with a set of four
relays in place of the four solid state outputs. The
relays have SPST contacts rated 5 amperes at 30 vdc
or 250 vac.
This model also includes a selectable isolated/non-
isolated 4 to 20 ma dc current output for transmitting
system information to other devices. The linear 4
5
0 to 50 0 to 20
1 to 25 0.5 to 10
2 to 45 1 to 18
1 to 45 0.5 to 18
15 to 45 6 to 18
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