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The Metrix 440 SR/ DR is one of the most popular Electronic Vibration Switches in North America. Formerly the PMC/BETA 440, this switch is a rugged switch with high reliability that can be used in non-hazardous and Class 1 Division 2 hazardous areas.

The Metrix 450 SR/DR switch has the same internal electronics as the 440, but uses an explosion-proof enclosure for CSA-approved use in Class I Division 1 Groups B, C, D, Class II Division 1 Groups E, F, G, and Class III areas. The 440 / 450 was designed by PMC/BETA over 20 years ago and is considered to be in the Decline stage of its product life cycle.


Predictive Services

Our core personnel have over 50 years experience in Predictive Technologies and over 50 years in Corrective Services. Our service group consists of a Professional Engineer, Engineering Technologists, and Industrial Millwrights and Mechanics.

Service Options


We offer a variety of training courses in the fields of Predictive and Proactive Maintenance. Every course is built with a modular approach that allows for customization for our clients specific needs.

Custom course content is gladly provided – simply provide us with the participants’ level of expertise, the topics of interest, and the course length desired. We will design the courses for you.

Training Courses


PDM is the Canadian distributor for Adash and Hansford products.

We’re proud to work with a host of suppliers to provide vibration instrumentation.