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QMI - Making the world a safer place
2700 Series Seismic Sensor
For Emergency Door Control Applications


  • Opens doors if an earthquake is detected
  • Automatically closes doors after 5 minutes (time adjustable from 1minute to 20 minutes)
  • 3-axis vibration sensing
  • Reliable P-wave detection for earthquake early warning
  • Uses patented electronic earthquake detection technology
  • Liquid Crystal Display provides user friendly interface
  • Meets ASCE 25-97, CSA B44.1, ASME A17.5, and UL508
  • Dry contact output for doors:
    • Normally Open, non-latching
    • 4 isolated sets for Door Open
    • 4 isolated sets for Door Close
    • Max load (power factor = 1.0) 2A @ 30VDC, 0.6A @ 110VDC, or 0.6A @ 125VAC
  • Dry contact output for other control applications
    • Max load (power factor = 1.0) 5A @ 30VDC or 250VAC
    • Normally Open or Normally Closed (Form C)
    • 2 sets Latching and 1 set non-latching
  • Connection for remote reset of latching alarm contact
  • Each set of contacts is configurable for the type of alarm or trouble situation that will trigger it
  • Records date, time, duration and peak acceleration in each axis for every disturbance
  • Meter mode allows real-time monitoring of kinetic forces (accelerations) acting on the unit
  • Serial communication via RS-232 allows for remote monitoring downloading of stored data


This industrial, user-friendly system was developed with emergency services in mind. It detects both vertical and horizontal ground movements and incorporates proven p-wave recognition technology to provide up to 2-minutes early warning for an earthquake. When this early warning is detected, the controller will open the doors automatically, preventing the door from seizing shut due to earthquake damage. An external 115dB siren and strobe provided with the system will alert anyone nearby that an early warning event has occurred.

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

The system has eight independent, normally open relay contact outputs for door control (four to open doors, four to close doors) to control up to four doors. The door open contacts will activate when an earthquake early warning event is detected. The door close contacts will automatically activate after 5 minutes. This timer is adjustable from 1 minute to 20 minutes.

The system also has two independent, form C relay contact outputs (normally open or normally closed) for seismic alarm. One set of alarm 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 form C 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)
Door Control Dry Contact Rating 0.6A @ 120VAC
2A @ 30VDC
Aux. 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
Door Control Outputs 2 x 8-position, screw-type pluggable terminal block 0.200" spacing.
2-positions for each door-control relay (normally-open)
Aux. 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)
Siren Control Output 3-position, pluggable terminal block.
Provides 12V DC power and trigger signal to siren.
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.

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