ABUS Technologies Log Box-DA Data Logger - Manual (Page 9)

ABUS TECHNOLOGIES INC.
9
Log Box-DA
4.4 External Battery Switch
The example below shows the usage of the external battery switch for commanding the power
supply of external devices. - Channel 1 is configured to 4-20mA input signal. A battery is used to
provide power to the 4-20 mA loop. The battery switch “turns on” the power to the loop a moment
(defined in the configuration) before the measurement is taken, enabling the transmitter (pressure,
temperature, etc) to start up and stabilize the output. This approach saves the battery energy, as the
power is turned on only when required (before each measurement).
Example of the battery switch powering a transmitter.
5. INSTALLATION
5.1 Recommendation
1. Signal wires should be installed in grounded conduits and away from power or contactor wires.
2. Instruments must be powered only by an exclusive power supply.
3. System failure should always be taken into account when designing a control panel to avoid
irreversible damage to equipment or people.