About Us

Demesa, is a Canadian owned and operated company, established in 2001 and operates in both official languages. Our experience extends itself over 23 years. When we say ‘Instrument Specialist’ we are confident you will get the best service and knowledge. We are committed to you our customer, our partner.

Our service includes complete gas detection solutions including fixed system and portable instrument calibration, start-up/turn-key and commissioning of fixed systems. All services include certification. We also offer emergency service calls.

Some of our product partners are reputable companies such as MSA Safety, RKI Instruments, CET Instruments and Edinburgh Sensors.

Instrument Sales

Specializing in the sales of portable instruments for several applications.

As Instrument Specialists, we understand your need for a reliable and trusted source of products and information. We have established relationships with reputable and leading manufacturers of safety and environmental instruments for all your monitoring solutions.

Calibration Gases

Sale of calibration gases for your gas detection instruments, photo ionization detectors and other monitoring and detection technologies.

Sold in 17L, 34L, 58L, 103L and 221L cylinders.

Fixed Systems

Sale and installation of gas detection systems which provides continuous monitoring for potential hazards.

We can provide systems for numerous applications and configurations: from single point stand-alone detection system to a 32-point multi-floor parkade detection system with ventilation control.

We also supply design, configuration, material, installation and certification of your particular application.

Calibration Certification

We offer calibration services on most gas detectors, whether portable or fixed. We calibrate your instruments and provide a certificate of calibration using NIST traceable standards. Your instruments are certified according to manufacturer’s specifications.


Service and repair on all portable instruments and fixed systems by factory trained technicians.

All repairs done to your instruments are done to manufacturer specifications and we only use factory replacement parts. For further peace of mind we offer a 90-day warranty on all our repair service.