Bjong – User Manual – V1.0 - pg.17
6
Power supply
Bjong can be powered in three different ways:
1. Internal 3.6Vdc
2. Internal 8..24Vdc
3. External 8..24Vdc through POWER SUPPLY connector
The internal power supply is intended to be supplied by primary (non-rechargeable) batteries inserted
inside the instrument case. These are high-capacity batteries, almost completely free of self-discharge,
which allow the instrument to remain active for medium-long term campaigns.
The external source can more generally be supplied by batteries (rechargeable or primary) or by a power
supply present on site with working voltage in the declared range. The use of a power supply is usually
preferred in the case of fixed installations (where main voltage is available) while external rechargeable
batteries are the ideal choice for medium-term campaigns. Rechargeable batteries, in fact, have self-
discharge and need to be recharge periodically (approximately every 6-12 months).
Typical uses are shown in the following table:
Internal
primary 3.6V
battery
Power supply of digital/analog
inputs and built-in pressure sensor.
It cannot supply sensors connected
to RS485.
Long time monitoring activities (i.e. 4 years)
with low power sensors connected to
analog/digital inputs.
Internal or
external
primary 14.4V
battery
Power supply of digital/analog
inputs and built-in pressure sensor.
It can also supply sensors
connected to RS485.
Long term monitoring activities (>12 months)
with sensors connected to RS485. Low
sampling frequency or on event. Data
transmission: daily or on event.
This battery guarantees a low self-discharge.
External
rechargeable
11.1V battery
Power supply of digital/analog
inputs and built-in pressure sensor.
It can also supply sensors
connected to RS485.
Medium term monitoring activities (6/12
months) with sensors connected to RS485.
Elevate sampling frequency: < 5 minutes. Data
transmission: frequency < 12 hours.
External
source power
supply
Power supply of digital/analog
inputs and built-in pressure sensor.
It can also supply sensors
connected to RS485.
Monitoring activities in fixed sites, using all
types of sensors. Elevate sampling frequency:
< 5 minutes. High data transmission
frequency: < 6 hours.
B.M. Tecnologie Industriali is able to recommend and supply a wide range of batteries, so as
to ensure compatibility with the most varied installation needs.
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