IMPORTANT NOTICE: G-Remote App will no longer work After 31st August 2024

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G-ULTRA – The ultimate GSM solution

With the G-ULTRA, your entire world fits into the palm of your hand, giving you complete control at your fingertips. This is the evolution of GSM technology, designed to offer you the ultimate flexible, mobile-based access control and monitoring solution and allowing you to transcend archaic notions of what GSM can achieve.

Unbridled. Unchained. Unmatched. Ultra.

Main features:

  • Monitor up to four electrical devices by receiving push notifications
  • Use the outputs to control up to six devices from your phone (two additional onboard relays)
  • Intelligent monitoring of CENTURION gate motors’ status outputs (for example gate opening, gate left open, etc.)
  • Suitable for a wide variety of access automation applications
  • Time-barring and visitor control – ideal for B & Bs and guesthouses
  • LCD screen for easy access to diagnostics
  • Instant activation via MyCentsys Remote mobile app
  • Easy setup via G-WEB PLUS online interface

Devices that can be monitored via the inputs

  • House alarm: activated
  • Electric fence: alarm triggered
  • Geyser status: On/Off
  • Mains power: On/Off
  • Fridge aboard your boat: On/Off
  • Borehole pump status: Running/Off
  • Water reservoir: Full/Empty
  • Entrance gate status: Open/Pedestrian

 Devices that can be controlled via the outputs

  • Automated entrance gates
  • Geysers
  • Appliances, e.g. the fridge aboard your boat
  • Air conditioners
  • Borehole pumps
  • Lighting systems
  • Irrigation and water features
  • Alarm systems


Supply Voltage Range 11-24VDC
Maximum Current Draw 300mA @ 12VDC
Input / Output Current Rating 50mA (Open Collector)
Relay Contact Current Rating 1A, 30V AC/DC (Resistive)
Input Sense Voltage Range 0-24VDC (0-1.6V Low Input State, 5V-24V High Input State)
SIM Card Micro Format, Activated MTN® SIM Card Supplied. 1, 2 NOTE: The supplied SIM Card may only be used with this specific G-ULTRA device. The SIM Card will be deactivated and blacklisted upon insertion into any other GSM device.
Number of configurable Input / Output Channels 4
Number of Relays 2
Memory Capacity • 1500 Access numbers • 5000 Event logs • 20 Access Profiles • 1 Custom Welcoming SMS Message for New Access Numbers • 20 Custom Output Activation SMS Messages (From User to Device) • 30 Custom Input Notification SMS/Email Messages (From Device to User) • 100 Visitor Time-barring Windows (Windows are the periods between two dates) • 30 Generic Time-barring Windows (Windows are weekly recurring) • 10 Output Activation Schedules (Schedules are weekly recurring) • 3 Daylight Saving Periods • 4 Input to Output Mapping Configurations
Model Options GSM 2G: 850/900/1800/1900MHz (EDGE) GSM 3G: 900/2100MHz (EDGE) 900/2100MHz (UMTS) GSM 3G PENTA: 800/850/900/1900/2100MHz (UMTS) GSM 4G/LTE-CAT1: 900/2100MHz
Degree of protection IP40

1. May not be used in devices other than G-ULTRA.
2. Remains the property of Centurion Systems (Pty) Ltd.

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