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Sentry-6002 NEMA 4 protection grade battery monitoring system for 120V and 240VDC

Sentry-6002NEMA is a powerful battery monitoring system for substations with vented (flooded) or valve regulated lead acid batteries. It has been re-designed based upon our field proven BM6500 (1996) and BM6800 (2007) models to provide effective remote battery management according to the IEEE updated standards:

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

IEEE Std. 450 – 2010: Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications (IEEE Link)

Main Features

  • Ultra precise IR (Internal Resistance) measurement for each cell detects dry-out and deterioration/capacity loss long before a problem occurs.
  • Discriminate inter-cell and battery to bus connection resistance to identify connection problem without a discharge.
  • Ambient and multi-point pilot battery temperature monitoring.
  • IP65 (NEMA4) grade protection allows unit(s) to be installed inside the battery room. Compact design allows for easy installation on a rack or wall.
  • Automatic discharge capture to database to record planned load test and unplanned power outage.
  • No mechanical scanning relays, resulting high reliability.
  • Plug & play HMI (optional) allows field service without a computer.
  • Industry standard Modbus-RTU and Modbus-TCP communication.
  • Full support to SNMP networking battery management system
  • Compatible with Battery Analyzer software and MyBattery Platform™ for cloud based remote monitoring.


Power Supply
Power Input Internal DC/DC converter, 90 – 150V input; Maximum Consumption: 10W   250VDC version available
Current/Temperature Measurement
Current Transducer (CT)  Support  LEM current transducer with internal +/-12V power supply   Default CT: HTA 300-S, measurement range +/- 450A, window size D-32mm.Accuracy: 0.1% + sensor accuracy
Temperature Sensing 1 ambient temperature sensor, 2 pilot temperature sensors   Measurement range: -20⁰C to 60⁰C, operating range: 5⁰C to 40⁰C (41⁰F to 104⁰F)Accuracy: 1 ⁰C
Voltage Measurement
Battery 60 x 2V cell per unit, up to 3,000Ah   For 120 x 2V application, 2 units are required for each string. For large UPS 240 x 2V application, 4 units are required for each string.
Bus Voltage Range: 90 – 160V per unit; Accuracy: 0.1%
Input Range to Each Channel +/- 3V for 2V batteries
Accuracy 0.1%
Input Wiring 2-wire sampling for each battery, UL 300V 12-conductor 20AWG cable recommended
Internal Resistance and Connection Resistance
Range and Resolution 0 to 3mΩ, 0.005 mΩ resolution
2-wire mode Internal Resistance and discriminate Connection Resistance.
Serial Port Isolated RS-232C and RS-485 interface   MODBUS RTU, 9600-8-1-NoneModbus address 1 to 28, configurable with HMI
Ethernet Onboard DTU to MyBattery Platform or Battery Analyzer software   Modbus-TCP for integration
Indication and Alarm
LED indication
  • Dual-color LEDs for status
  • Orange LED for service alarm
  • Red LED for urgent alarm
Alarm Outputs Service Alarm (Normal Close, 0.1A capacity)Urgent Alarm (Normal Close, 0.1A capacity)
Unit Dimensions 13.50” (H) x 11.27” (W) x 7.18” (D)   343mm (H) x 286mm (W) x 182mm (D)
Weight 10 lbs per unit (about 4.5kg)

*Specifications subject to change without notice

Sentry-6002NEMA Datasheet (pdf)

Sentry-6002NEMA Connection Schematics (pdf)