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CETCI’s New 3D Printed Calibration Clip Leaves Both Your Hands Free!

CETCI’s New 3D Printed Calibration Clip Leaves Both Your Hands Free!

At Critical Environment Technologies Canada Inc, (CETCI), we strive to be innovative, cutting edge and creative in our endeavors to fulfill our customers’ needs. Our latest testament to this is our newly designed calibration clip (or ‘Cal Clip’ as it is called for short). It has been an exciting few months as we have gone through different designs, prototypes, various types of plastics and calibration testing.

Remember the last time you calibrated one of our gas detectors that had a splash guard? The blue or orange calibration adapter cup that you had to hold with one hand over the splash guard while trying to open the gas cylinder with the other, flow gas and keep the cup snug up against the device? And depending on the location of the detector, acrobatics may have been involved, right? Well, those days are gone!

Our engineers have designed a device that easily clips around the splash guard and remains in place by itself, freeing up BOTH your hands to do what they need to do. Perhaps even give a high five to a coworker!



The Cal Clip is made of light, durable ABS/polycarbonate plastic and comes in our signature blue company colour. It is specially designed to allow calibration gas into the sensor vent through a small barb hose fitting attached to standard or Teflon tubing. The barb hose fitting can accommodate two sizes of hose: 1/8” (3.175 mm) ID and 3/16” (4.762 mm) ID. While stored, the tubing can be left attached or removed from the Cal Clip as desired.

The Cal Clip fits around the circular, black splash guard that is factory installed at the time of order on any of our black enclosure gas detectors or self-contained controllers. With the hose barb fitting at the bottom, pointing towards you, simply place the inside edge of the Cal Clip next to the outer edge of the splash guard and gently flex open the top of the other side outwards until it slips and clips around the entire splash guard. To remove, gently open the clip at the top while pulling one of the hooked ends towards yourself and it will slip off. If you pull the device apart too aggressively, overstretching it, the circular formation of the Cal Clip may be compromised. Evidence of this results in whitish bars appearing on the blue plastic (like stretchmarks).

NOTE: Because the Cal Clip is designed to prevent entry or exit of air except via the hose barb fitting, it must be removed from the splash guard during normal operation or else the gas readings will not be accurate.

About Critical Environment Technologies Canada Inc.

Critical Environment Technologies designs and manufacturers indoor air quality and fixed gas detection systems including self-contained systems, controllers and analog and digital transmitters. Applications include commercial HVAC, institutional, municipal and light industrial markets worldwide. Many of these applications are for vehicle exhaust, but areas of specialization include refrigeration applications, food processing plants, manufacturing plants, wastewater treatment plants, fisheries, wineries/breweries, pulp and paper mills, recreational facilities, bakeries, greenhouses, and many more.

For more information about our products, check out our website at or to discuss a tailored gas detection solution for your application, contact us at 1-877-940-8741.

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How often do gas cylinders need to be replaced?

How often do gas cylinders need to be replaced?

Gas cylinders are made by many different manufacturers, are available in a variety of sizes, can be disposable or refillable and filled with a low, high or pressurized concentration. Generally speaking, the shelf life of calibration gas, (also known as span gas), is dependent on three factors:

  1. Gas Type
  2. Gas Concentration
  3. Gas Cylinder Quality and Size

1. Gas Type

Calibration gases can be divided into two types: reactive and non-reactive. “Reactive” is a broadly used term for chemicals that have some instability under certain conditions and may react with certain materials, moisture, oxygen or other chemicals. Reactive gas mixtures include gases such as ammonia (NH3), chlorine (Cl2), hydrogen sulfide (H2S), sulfur dioxide (SO2), hydrogen chloride (HCl), hydrogen cyanide (HCN), etc. Reactive gas mixtures are normally filled in aluminum cylinders with stainless steel valves that have been treated to minimize reactivity with the reactive gas. These mixtures have a shorter shelf life, typically 6 months to one year, because the concentration of the reactive gas is likely to dissipate over time.

“Non-reactive” is a broadly used terms for chemicals that are stable under most conditions and are not affected by moisture, oxygen or other chemical interactions. Non-reactive gas mixtures include alkane or alkene hydrocarbons (methane (CH4), propane (C3H8), hexane (C6H14), isobutylene (C4H8), etc.), nitrogen (N2), hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), etc. Non-reactive gas mixtures are normally filled in steel cylinders and typically have a shelf life of about 3 years.

2. Gas Concentration of Reactive Gases

In some cases, a higher concentration of a reactive gas can have a longer shelf life than a lower concentration. In low concentrations, a few reactions can have a much larger effect on the overall composition of the mixture than the same reactions in a highly concentrated mixture.

3. Gas Cylinder Quality and Size

A well-made gas cylinder will have, on a microscopic level, the smoothest interior walls as possible. If the walls are rough, it allows the gas to come in contact with a larger surface area which increases the likelihood of a reaction with contaminants or the cylinder material itself. The quality of the internal walls and the material of the valves are both factors that affect the shelf life of reactive gases. In addition to the quality of the materials, larger, high pressure cylinders allow for longer shelf life because the ratio of the internal wall surface to gas volume is substantially less and thus there is less potential for a reaction.

Regardless of the type of gas mixture, cylinders that do not bear a legible written, stamped or stenciled identification of the contents should not be used. It is also important to note the expiry date and not to use the gas past that date. If an inappropriate amount of calibration gas is used or if expired gas is used during calibration or bump testing, the result could be improper calibration and may result in a potentially dangerous situation.

For suggestions on gas detection systems, indoor air quality monitors and calibration, please visit

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Gas Detectors

CETCI gas detectors are used to detect many different gases. Some of the most common are Carbon Monoxide, Carbon Dioxide, Nitrogen Dioxide, Nitric Oxide, Ammonia, Chlorine, Ozone, Combustible Gases like Methane and Propane, Oxygen, Refrigerants and more.

IAQ Monitors

The YES Series of IAQ Monitors are essential for those responsible for conducting Indoor Air Quality (IAQ) Investigations. These instruments are specifically designed to measure and record the quality of indoor air in offices, buildings, homes, schools, parking garages, ice rinks, etc.