Product category: Electromechanical Components
News Release from: Omron Electronics | Subject: D7E vibration sensor
Edited by the Electronicstalk Editorial Team on 9 November 2001
Vibration sensor eliminates mercury hazards
A new pure-mechanical vibration detector from Omron allows OEMs to build-in earthquake or shock protection without relying on environmentally hostile mercury switches
The D7E vibration sensor embodies an innovative operating principle to provide reliable switching when the device is subjected to undesirable vibration such as earthquake shocks, however switching will not be triggered by normal industrial vibration resulting from rotating machinery, vehicles or blasting.
This article was originally published on Electronicstalk on 9 November 2001 at 8.00am (UK)
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Conventionally this is done using mercury switches but the heavy metal can cause environmental and health hazards.
Instead the D7E relies on a ball freely seated inside a sealed enclosure.
Normally the ball is located over a sprung plunger, which holds a moveable plate in position and keeps the circuit closed, but vibration dislodges the sphere allowing the plate to rise and opening the contact.
In practical applications the switch would then initiate a shutdown process, for example cutting off the fuel supply to a burner, boiler or petrol pump, or re-routing fluids in a pipeline.
The same principles could be used to protect a gaming machine, vending machine or payphone against tampering.
Two models of the D7E provide protection in different acceleration ranges: the D7E-1 from 130 to 200cm/s2 and the D7E-2 from 100 to 170cm/s2 on a standard 0.3, 0.5, 0.7s seismic cycle, A third variant provides the alternative of tilt activation, with switching being initiated between 50 and 80 degrees.
All provide output capacity from 0.1mA at 5V DC to 100mA at 30V DC and operate within 5s at the maximum rated input stimulus.
Despite their sensitivity (100cm/s2 is just 0.1G), these units are highly robust, rated for 100G shocks and 0.2G vibration over 50h during transport.
They carry IP67 protection against dust and moisture ingress and operate dependably over the full -25 to +60C temperature range.
Insulation resistance is rated 100Mohm at 250V DC, while dielectric strength is specified at 250V AC for 50/60Hz tests.
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