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Sentry-NB4 Datasheet (pdf)Online Manualpdf Manual

Sentry-NB4 monitor provides powerful functions for online state-of-health battery management for large scale remote telecom cabinets or stations. The compact design makes it suitable for any size indoor/outdoor 24V or 48V system cabinets with 12V or 6V battery blocks. It combines superior data quality and ease of installation for effective remote battery management in accordance with the most recent IEEE standards:

IEEE Std. 1188 – 2005: Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead- Acid (VRLA) Batteries for Stationary Applications (IEEE Link)

Common Applications:

:: Telecommunication Cabinets
:: Cable/Broadband Cabinets
:: Traffic Light Control Cabinets
:: HPMS – Highway Performance Monitoring Systems
:: Solar Powered Radio Stations/Cell Sites

NB4 function blocks
  • Online IR (Internal Resistance) measurement to detect battery failure.
  • Thermal runaway detection and protection control output to interface with most chargers/rectifiers.
  • On-board data analysis for battery health evaluation. 
  • Industrial grade, compact design for indoor/outdoor applications.
  • Embedded web pages for remote monitoring.
  • Compatible with MyBattery Platform™ for large scale applications.
  • Integration support for 3rd party network battery management systems


Power Supply
Power InputInternal DC/DC converter, 18-60V input; Maximum Consumption: 3W
Current/Temperature Measurement
Current SensorSupports  LEM HASS current sensor with internal +5V power supply (Default range +/- 150A, window size 20mmx10mm)
Accuracy0.1% + sensor accuracy
Temperature Sensing1 temperature sensor, intelligent thermal runaway detection algorithm
Temperature RangeMeasurement range: -40 to 65⁰C
Operating range: -40⁰C to 65⁰C (-40⁰F to 149⁰F)
Accuracy1 ⁰C
Voltage Measurement
Battery Configuration48V system, 4 x 12V batteries 24V system, 2 x 12V or 4x6V batteries 
[Special order available for 12V and 36V systems.]
Bus VoltageRange: 18 – 60V; Accuracy: 0.1%
Input Range to Each Channel+/- 18V for 12V batteries
Internal Resistance
Range and Resolution0 to 30mΩ, 0.01mΩ resolution
Wire mode1-wire mode Internal Resistance for each battery block
EthernetOnboard Ethernet DTU Embedded web pages for real-time data and configuration/calibration Compatible with Battery Analyzer software and MyBattery Platform.
Indication and Output
LED indicationDual-color LEDs for status and alarm
Control OutputNormal Close, 0.1A capacity to control charger/rectifier ON/OFF for thermal runaway protection
Unit Dimensions115mm(H) x 90mm(D) x 32mm(W), 4.50 x 3.50x 1.25 in.
MountingDIN-35 rail (a versatile clip included) 
*Specifications subject to change without notice