FB2100 Flow Computer Instruction Manual
D301783X012
November 2023
38 Installation
Figure 2-24. DC Power Connections
To external DC power supply
44TNote
If your flow computer does not power on, check that the polarity of the DC input voltage
wiring connections match Figure 2‐24. If you accidentally reversed the polarity of the
connectors, it triggers a polyfuse (positive coefficient temperature thermistor) to protect
the device from damage. Once the polarity is corrected, the polyfuse resets automatically
to allow for proper operation.
Connecting Battery Power
EXPLOSION HAZARD: Ensure the area in which you perform this operation is non-
hazardous. Performing this operation in a hazardous area could result in an explosion.
44TImportant
If you purchased this device with the rechargeable lead acid battery pack, be aware that
the lead acid battery pack must always be stored in a charged state. If you do not intend to
install the flow computer immediately, make provisions to “top-off” the lead acid battery at
six-month intervals. Failure to do so could sharply reduce battery life or result in a dead
battery. Note: Battery options for main power are not allowed in ATEX installations.
When power comes from an internal battery pack, the battery pack plugs into one of two
connectors.
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