centration. Each value is displayed for approximately
2 seconds. After completing the sequence, the con-
troller automatically returns to the Normal operating
mode if the Reset button is no longer being
depressed.
This mode is used only for displaying the setpoints.
Use the “Setpoint Adjust” mode for changing setpoint
and calibration gas values.
CALIBRATE
The R8471 Controller uses a fully automatic calibra-
tion procedure that requires no adjustments to be
made by the operator. The Calibrate mode is entered
by pressing and holding the Reset button until com-
pletion of the “Setpoint Display” sequence described
above (approximately 9 seconds). The controller per-
forms the Zero adjustments, then signals the operator
when to apply and also when to remove the calibra-
tion gas. Upon completion of a successful calibra-
tion, the controller automatically returns to the Normal
operating mode.
If the operator fails to complete the calibration proce-
dure, if an error in calibrating occurs, or if a success-
ful calibration cannot be completed, the microproces-
sor will automatically return to the Normal mode (after
10 minutes) and continue to use the previous calibra-
tion data. A fault indication (“F2X” status) will be dis-
played until a reset occurs. If the microprocessor
determines that the sensing element is approaching
the end of its useful life, “F10” will be indicated on the
digital display. Refer the “Calibration” section for
complete information regarding calibration.
While in the Calibrate mode, all controller outputs are
inhibited, the CAL LED is illuminated, and the dc cur-
rent output goes to a preset level (adjustable from 0
to 20 ma).
SENSOR REPLACEMENT
This mode inhibits all controller outputs to allow sen-
sor replacement without removing power from the
controller. In addition, this mode automatically sets
the factory default values for sensor calibration.
Other programmed setpoint values are not affected.
CAUTION
Upon entering the Sensor Replacement mode,
all previously entered sensor calibration informa-
tion is lost. Sensor calibration must be per-
formed, even if the sensor was not replaced.
To enter the Sensor Replacement mode, first enter the
Calibrate mode as described above, then press the
Set button. To exit this mode, press the Reset button.
SETPOINT ADJUST
The Setpoint Adjust mode is entered by depressing
the Set button for approximately one second. In this
mode the alarm setpoints and calibration gas level
are sequentially displayed on the digital display for
approximately five seconds and the corresponding
LED flashes. To change the setpoint, depress the
Reset button to increase the displayed value or the
Set button to decrease the value. If no changes are
made for 5 seconds, the microprocessor automatical-
ly advances to the next setpoint. At the end of the
sequence, the microprocessor automatically returns
to the Normal operating mode.
DC CURRENT OUTPUT CALIBRATION
This mode is used to calibrate the 4 to 20 ma dc out-
put. To enter this mode, hold the Set button, then
press Reset. First the 0% LFL value (4 ma) is gener-
ated for approximately 7 seconds while the Low LED
flashes. Then the 100% LFL value (20 ma) is generat-
ed while the High LED flashes. Finally the current out-
put during calibration is generated while the CAL LED
flashes. The microprocessor automatically returns to
the normal operating mode at the end of the
sequence. Adjustments to the current output level
are made by pressing the Reset (increase) or Set
(decrease) button. This procedure requires a dc cur-
rent meter to monitor the actual controller dc mil-
liampere output.
Section II
System Installation
INSTALLATION
NOTE
The sensor is not included in the FMRC
approval.
NOTE
Refer to the sensor manual for complete infor-
mation regarding sensor installation.
SENSOR LOCATION
It is essential that the sensor be properly located to
enable it to provide maximum protection. The formula
for determining the most effective number and place-
ment of sensors varies depending on the conditions
at the job site. The individual performing the installa-
tion must rely on experience and common sense to
determine the quantity of sensors and the best sensor
locations to adequately protect the area.
7 95-8398
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