Detcon 110A-FB-BBU - Manual (Page 4)

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1.15 INSTALLATION
The 110A-FB-BBU, 4-20 madc output is factory calibrated and tested prior to shipment and should not
require field level adjustment. Should fine tuning become necessary, the digital to anlog converter is
calibrated via the 4-20 MA Span and Zero potentiometer as shown on drawing #800.27A.
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1.13 ANALOG 4-20 MA OUTPUT CALIBRATION
Detcon Model 110A-FB-BBU Gas Detection System PG.4
Step 1. Securely mount the 110A-FB-BBU enclosure in accordance with detail drawing #801-BBU.
Step 2. Connect 117 VAC input wiring to the lugless terminal strip (labled VAC IN) on the controller
mother board as detailed in drawing #800.27A. Line power current load is maximum .5 amps.
Step 3. Note that the 24 VDC standby batteries are prewired to the lugless terminal strip (labeled VDC
IN) on the controller motherboard..
Caution: Observe correct polarity when terminating all input / output field wiring. Failure to do so may
result in circuit damage on power up.
Step 4. If applicable, connect a normally open momentary remote mounted switch to the lugless
terminal strip (labled RESET) located on the cotroller mother board as detailed in drawing #800.27A
Step 5. Refer to installation and wiring detail of remote mount sensor assemblies as detailed in section
3.0. Terminate field wiring from sensors to Model 110A-FB-BBU lugless terminal strips located on the
controller mother board as shown in drawing #800.27A.
Note: Based on the application and use of relay contact outputs, complete all wiring terminations prior
to application of power. Shut-in controls may be omitted until system test is complete.
Upon completion of all field wiring:
Turn the unit on via the power switch located on the motherboard. Note that the 110A-FB-BBU digital
display illuminates. Varying readings may occur
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1.16 START-UP
RANGE - 0-99 ppm
ACCURACY / REPRODUCIBILITY - + or – 1% F.S.
OPERATING TEMPERATURE - –40 deg. F to +175 deg. F
INPUT POWER - 117 vac
POWER CONSUMPTION - max 6 watts
WARRANTY - one year
OUTPUTS - 4-20 madc
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1.17 SPECIFICATIONS
The 110A-FB-BBU comes with a battery backup option not included with the 110A-FB. This option
includes two batteries mounted under the motherboard that, in the event of a loss of VAC power, will
power the unit for up to 18 hours. The batteries are automatically recharged when VAC power is
re-established. Care should be taken to not allow the unit to run on battery power for more than 18
hours. The battery backup function is disabled when the power switch is turned to the off position.
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1.14 INTERNAL BATTERY BACKUP