FloBoss 107 Instruction Manual
Revised June-2017 Sensors and Transducers 6-7
Lightning Protection Corporation
PO Box 6086
Santa Barbara, CA 93160
Telephone: 1-800-317-4043
http://www.lightningprotectioncor.com/
6.2 Dual Variable Sensor (DVS) Overview
The DVS provides the FB107 with static pressure and differential
pressure measurement for orifice flow calculations. Each FB107
supports one DVS.
Figure 6-4. FB107 Enclosure with DVS
Note: The DVS is not user-installable, but is factory-installed in
107E enclosures. This is required to maintain hazardous
area certification.
The DVS measures differential pressure and absolute or gauge
(static) pressure by converting the applied pressure to electrical
signals and making the readings available to the FB107. The sensor
mounts on an adapter which bolts to the exterior of the FB107’s
case and connects to the DVS port on the FB107.
DVS readings store as analog inputs in the FB107. If you enable the
alarm for that AI point and the DVS fails to communicate during
either initialization or operation, the FB107 enters an alarm in the
alarm log.
At least once each second, the DVS uses an interrupt to signal the
FB107 that the DVS is ready for an update. The FB107 converts
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