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Sentry-2412 Datasheet (pdf) Online Manual pdf Manual

Cost-effective for UPS cabinet with up to 24 battery blocks

The Sentry-2412 is an industrial grade battery health monitoring system designed for a wide range (100 to 350V) of UPS systems and utility switchgear DC applications. This compact unit combines superior data quality with a flexible and streamlined installation, which makes it suitable for server rooms, data centers, refineries, railroads, substations, as well as numerous other industrial applications.

IEEE standard reference:

IEEE-1188, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Valve-Regulated Lead-Acid (VRLA) Batteries for Stationary Applications

IEEE-1106-2015, IEEE Recommended Practice for Installation, Maintenance, Testing, and Replacement of Vented Nickel Cadmium Batteries for Stationary Applications

IEEE-1184, IEEE Guide for Batteries for Uninterruptible Power Supply Systems

IEEE 1491-2012 IEEE Guide for Selection and Use of Battery Monitoring Equipment in Stationary Applications

Main Features

  • Precise IR. (Internal Resistance/Conductance) online measurement is performed on each battery (or multi-cell), user selectable internal resistance or conductance data display. Sufficient precision for high capacity Lead Acid or Nickel Cadmium batteries while used for multi-cell monitoring.
  • High Noise Immunity. Provides for accurate measurement on high ripple ups systems.
  • Compact Design. Permits convenient installation on top, or inside of the battery cabinet.
  • Easy to Install. Simplified connection: one wire per battery, plus three IR wires for one string. Easy to set for any number of cells for multi-cell applications. (For example, 87 x 1.2V NiCad, 21 channel with 4-cell and last channel 3-cell.)
  • Reliable Solid State Scanning. (rather than mechanical relay) provides the highest reliability for industrial applications.
  • HMI Panel. The plug and play touch panel (optional, handheld or panel mounting) displays battery data and alarms. It allows the technician to configure and calibrate without the need of a PC.
  • Access Data/Alarm from Anywhere. Firewall friendly Battery Analyzer software, plug and play, easy to manage large number of sites from anywhere via internet. Alarming through email, SMS and SNMP trap.
  • Supports Site/Building Management Systems. The system fully supports 3rd party network battery management systems with SNMP, Modbus TCP and hyperlink to real-time data.

Main Measurements

  • Individual Battery or Multi-cell Voltage
  • Individual Internal Resistance (IR)
  • String/Charger Voltage
  • String Charge & Discharge Current, Ripple Current
  • Ambient Temperature
  • Pilot Battery Temperature


  • Bank/Charger Voltage High/Low
  • Ambient/Pilot Temperature High
  • Individual Battery Voltage High/Low
  • Individual Battery Internal Resistance High/Low


Power Supply
Power Input Powered by battery bank, 100-350VDC input; Maximum Consumption: 5W
Isolation 1,500VDC@1min to battery string
Current/Temperature Measurement
Current Sensor Support  LEM current sensor with internal +/-12V power supply

(Default range +/- 400A, window size D-35mm)

Same sensor is used for ripple current measurement

Accuracy 0.1% + sensor accuracy
Temperature Sensors 1 ambient temperature sensor, 1 pilot temperature sensor
Range Measurement range: -20 to 60ºC, operating range: 5ºC to 40ºC (41ºF to 104ºF)
Accuracy 1 ºC
Voltage Measurement
Channel Max 24 channels (configurable for less than 24 channels)
Bus Voltage Range: 0 – 350V; Accuracy: 0.1%
Input Range to Each Channel +/- 16V for 12V batteries, Or +/- 20V for 16V batteries (special order)
Protected input +/-350V at any voltage input terminal
Accuracy 0.1%
Input Wiring 1-wire from (+) positive of each battery plus the (-) negative of last battery.
Internal Resistance /Conductance
Range and Resolution 0 to 30mΩ, 0.01 mΩ resolution
1-wire mode Total value of Internal Resistance + Connection Resistance.
Serial Port Isolated RS-232C and RS-485 interface
Protocol and Serial Settings MODBUS RTU, 9600-8-1-None
Modbus address 1 to 28, configurable with HMI
Ethernet Onboard Ethernet LAN connection to Battery Analyzer or MyBattery Platform
SNMP, Modbus TCP, email/SMS message, hyperlink to real-time data
Indication and Alarm
LED indication
  • Dual-color LEDs for status
Alarm Outputs Service Alarm (Normal Close, Voltage-free, 60V 0.1A capacity)Urgent Alarm (Normal Close, Voltage-free, 60V 0.1A capacity)

*Specifications subject to change without notice