Elevators Buildings Emergency Doors Gas Pipelines Contact Us
QMI - Making the world a safer place

Click here for printer friendly version of this page

2500 Series Seismic Sensor
For Elevator & Escalator Control Applications


  • 3-axis vibration sensing
  • Patented electronic earthquake detection technology
  • Alphanumeric liquid crystal display
  • Dry contact output
  • Record of peak acceleration in each axis for up to 15 seismic events
  • Metering mode allows real-time observation of "g-force" acting on the system in each axis
  • Rechargeable battery backup
  • Meets ASCE 25-97, ASME 17.5, CSA B44.1, and UL508


This industrial, user-friendly system detects both vertical and horizontal ground movements (3-axis). The system stores the peak acceleration (in "g") in each axis for up to 10 seismic events. The setpoint for the sensor can be set through the user interface to trip according to the ASCE 25-97 standard, or according to a user-defined threshold between 0.01G and 1.00G. The default setpoints are 0.10G in the horizontal and 0.05G in the vertical.

The Liquid Crystal Display (LCD) provides an easy-to-use and easy-to-understand interface.

The system has 2 independent relay contact outputs (normally open or normally closed) for seismic alarm. One set of contacts is latching and will remain in the "activated" position until manually (or remotely) reset. The other contact is a non-latching contact and will automatically reset when the seismic disturbance is over.

Another set of latching relay contact outputs (normally open or normally closed) is provided for trouble or error indication. This contact will activate if an error is detected during a self-diagnostic check. The cause of the trouble condition will be displayed on the LCD. The relay contact will remain activated until it is manually reset.


Technical Specifications
Sensor 3-axis solid-state accelerometer-based. Detects vertical and horizontal accelerations.
Frequency Response 0.5Hz to 15Hz (Software filtered)
Setpoint 1 0.10G X-Y & 0.05G Z, according to ASCE 25-97 standard or user-defined.
Diagnostics Self-diganosis at startup, reset and periodically during operation.
Power 12~24V AC/DC OR
110V AC 60Hz (models with built in transformers)
Battery Backup 6.0V NiCd rechargeable battery pack (internal)
Dry Contact Rating 8A @ 250VAC
8A @ 30VDC
Operating Temperature Range -25°C (-13°F) to +40°C (+104°F)
Relative Humidity 0% to 99%
Control Inputs 2-position, screw-type terminal for remote reset of latching contacts
2-position, screw-type terminal block for 12~24V power supply
Control Outputs 3-position, screw-type barrier strip for alarm latching relay contact (form C)
3-position, screw-type barrier strip for alarm non-latching relay contact (form C) 3-position, screw-type barrier strip for trouble latching relay contact (form C)
Dimensions Steel enclosure
      8"(W) x 7"(H) x 3"(D)

1 Setpoints can be adjusted through the user interface. Custom setpoints may be set by the factory if required.

Download the Technical Data Sheet here.   Requires free Acrobat Reader from Adobe.
QMI Home Return to Top S-Box Home
Copyright © 2007, QMI Manufacturing Inc.  All rights reserved.