Quad Mixes		Is your Cal Gas Expired?
Reactive Gases		Safety First!
Non-Reactive Gases		Proper Disposal
Gas Generators		Let’s Go Shopping!
Regulators / Accessories		F.A.Q.’s

Quality Calibration Gas. Competitive Pricing. Exceptional Service.

We offer a FREE notification service. All you need to do is email us your gas type, cylinder size, and the expiration date or the manufacturer's date. We will then send you an email when your gas is getting close to expiring.

Welcome to CalibrationGas.com

We appreciate your visit and want to thank you in advance for considering doing business with us.

Our Calibration Gases meet and exceed the highest quality standards. We’ve priced our gases competitively to encourage you to order online. But our primary concern is to provide exceptional service.

We hope CalibrationGas.com will be a source of information as well as a source of supply. If all we can do for you today is answer a question, we’ve done our job. Please look us up again the next time you need to order Calibration Gas or anything related to Gas Detection Instruments. We also offer Onsite Calibration and Rental Services. Call 888.972.3389 for details.

Is your Cal Gas Expired?

Did you know that Calibration Gas expires? The additives used to stabilize the gases inside the cylinder dissipate over time and the accuracy of the gas cannot be guaranteed past the warranty period.

The cylinder you have now should be marked with either an Expiration Date or a Manufacturer Date. If your cylinder has a Mfg Date, use these general guidelines to determine when your calibration gas will expire:

LEL Mixtures and Non-Reactive Mixtures, 3 years
H2S, SO2, H2S-mixes, NO, NH3, ETO and HCN Mixtures, 1 year
CL2 and HCL Mixtures, 8 mos.
NO2, SiH4 and Ph3, 6 mos.
Benzene, 1 year

Safety First!

Never refill cylinders. DOT 39 regulations state that these cylinders may not be refilled. In addition, cylinders with this rating may not contain toxic or poisonous gas. Consequently, our cylinders never contain toxic or poisonous gas and we fill very few flammable gas mixtures.
Always hold the gauge and regulator away from your face during engagement with the cylinder.
Always refer to the owner’s manual of your meter or instrument to determine the correct gas mixture for calibration.
When using these products the basic rules for handling compressed gases must be observed. Though small, the cylinders are under significant pressure.
Do not store cylinders with the regulator engaged in the valve. The regulator is not designed as the primary sealing mechanism. You can lose an entire cylinder to air in this manner.
Before attaching a regulator to the cylinder, ensure that the regulator is in the “on” position. Once the regulator is fully engaged in the cylinder, turn the regulator on/off knob to the “off” position until ready to sample. This procedure will help prevent air from being introduced into the cylinder and contaminating the reactive gas mixture.
Keep your sampling system short and use compatible materials. Teflon® tubing works well in the majority of applications.

Proper Disposal

All cylinders are manufactured to DOT39 or DOT2Q regulations, which means they are not to be refilled. These regulations also prohibit filling with toxic substances. When empty, the cylinders present no hazard to health or the environment. The empty cylinders, regardless of the product they once contained, may be disposed of without special precautions. Most landfills will accept these cylinders for disposal.

As part of our continued commitment to our customers and the environment, we have initiated a recycling program. Our customers may return empty cylinders for recycling, or you may also purchase one of our recycling kits we have available and recycle them yourself. Either way, feel free to contact us with any questions you have.

Let's Go Shopping!

4-in-1 Mixes– Quad Mixes or MultiGas mixes that include O2/LEL/CO and H2S or SO2.
Reactive Gases– including Ammonia, Chlorine, Sulfur Dioxide, etc.
Non-Reactive Gases– including CO, CO2, Air and O2/LEL/CO mixes.
Gas Generators– for gases that cannot be bottled such as Chlorine Dioxide.
Regulators-Accessories– for all the other supplies you might need for instrument maintenance.

We can also provide the very small, disposable cylinders if you only maintain one instrument -OR- the large re-useable cylinders if you operate an instrument shop to maintain numerous instruments. Calibration Kits are no problem either.

We will continually update CalibrationGas.com. If you cannot find the specific mixture of calibration gas that you need, simply send us a request for quote via email.

CalibrationGas.com is another value added service provided by All Safe Industries, Inc.

Frequently Asked Questions

Q: How often should I calibrate my gas meter?
A: At least every 30 days or monthly. This is the #1 most frequently asked question, and for good reason.

The electro-chemical sensors in your gas meter can change due to temperature, humidity or sudden impacts from the unintentional drop check. It’s important to function check or “bump test” (see next FAQ) before each use and perform a span calibration once every 30 days.

Some electro-chemical sensors need frequent reminders of their purpose in life. That is, they must be exposed to the target gas on a regular basis in order for the sensor to remain chemically active. This is especially true for Ammonia sensors and Chlorine sensors. Calibrating your gas detection instrument every 30 days will accomplish this.

More frequent calibration for instruments with heavy usage is acceptable. However, calibration every day can be excessive and expensive. You are responsible for determining your calibration frequency. Contact us for assistance.

Q: What is a “bump check”?
A: A “bump check” is a quick exposure to Calibration Gas to see if the sensors in your gas meter will respond. Do this by simply applying Calibration Gas while the meter is in the regular run mode. You should get alarms on each sensor and they should respond to within 10% of the concentration listed on the cylinder.

If your meter does not respond or doesn’t come within 10% of the concentration, a calibration is required. A calibration is different from a “bump check” in that an instrument in calibration mode makes adjustments to the sensor readings to match the known concentration of gas being applied. Contact us for the calibration procedure of your gas meter.

You say you’re not doing “bump checks”? Check out how simple it can be with our Bump Check Station.

Q: Can I use the same regulator on all of my gas mixtures?
A: Yes and no. The regulator you use depends more on the type of cylinder you have rather than the type of gas you have. Put simply, there are male regulators and female regulators. Typically, the only cylinders that use the female regulators are the small steel cylinders. These are usually 17L or 34L cylinders of a single gas or non-reactive gas mixture.

It is recommended that a regulator be dedicated to a specific service if the gas is reactive such as Chlorine or Ammonia. Also be sure the regulator is designed for reactive gases. The internal components are of a more durable material.

Q: Can I use my gas past the Expiration Date?
A: We’re all tempted to use Calibration Gas that just expired yesterday. But days turn into weeks and weeks into months. Before you realize it, your cylinder is three months past the expiration date. If OSHA comes in for an inspection, they’ll be sure to ask about your instrument calibrations. Be sure to have a current cylinder of Calibration Gas.

Q: Can I throw my empty cylinders in the garbage?
A: Yes. See Proper Disposal above.