Demand Flow Regulators

Demand flow regulators are commonly used with calibration gas docking systems and gas detectors with a sample pump. The regulator diaphragm opens to match the draw from the pump and closes when there is no pull. So with a demand flow regulator there is no need to turn the regulator on and off which makes it perfect for permanent installations.

SGA have added two new demand flow regulators to our product portfolio. Our 310 Series Demand flow Regulator (Part # DFR-1) is designed purely for use on portable calibration gas cylinders with the C10 connection. With innovative design and reducing the size of the regulator we have managed to make a significant reduction in the price which we are sure will be very popular with our customers. The design of our 300 series demand flow regulators for high pressure cylinders and 34DS cylinders has also been upgraded with a reduction in size. We stock a full range of CGA and Australian Valve Type connections for the 300 series demand flow regulators.

310 series Demand Flow Regulator PDF

300 series Demand Flow Regulator.pdf


A gas detector is a vital part of PPE and if used correctly it may save your life if you find yourself in a hazardous environment. Many people with gas detectors don’t understand how they work and the hazards associated with incorrect use. Just because it was calibrated last week, doesn’t mean it is working properly today.

The toxic sensors are usually electro-chemical cells which means they contain a chemical that will react with the gas to be detected and generate an electrical signal to indicate the level of gas detected. However when the chemical in the sensor is consumed by the sensor, it stops measuring gas and doesn’t generate a fault alarm. So in this circumstance the user is not protected by the gas detector because it will display no gas present even when there is.

The flammable sensor is usually a semi-conductor, and these sensors are prone to being poisoned. Silicon is the biggest problem and commonly present in paint fumes and a vast array of chemicals. If a chemical sticks to the semi-conductor sensor probes and coats them, the sensor can no-longer measure the flammability of the environment the detector is in and will continue to display zero or a very low %LEL even when the actual LEL rate is dangerously high.

So now understanding the way a gas detector works we can adopt strategies to keep the workforce safe. We know that just because your detector worked yesterday it doesn’t mean it is working properly today, so the best way to check it is working properly is to apply gas, this process is known as response testing or bump testing. With multi-gas mixtures available now with 4 or 5 gases in one cylinder, it can be a very quick process to simultaneously check all sensors. The typical time it takes a detector to respond to all gases is about 20 seconds. To be truly safe, a gas detector should be response tested every time before use. In reality companies and authorities set their own guidelines and often agree on once per day.

The consumable cost of the gas might be somewhere in the region $1.50 per response test but if that saves one life, it has to be worth it, especially if it is yours!

With docking stations available for gas detectors that charge the battery in the detector and response test it over-night this process is automated.

People often confuse response testing with calibration, they are not the same thing. A calibration is the process to accurately set the levels of the sensor and must be done in a controlled environment. It takes time for the sensors to settle to an accurate level so typical duration of a calibration is 60 to 90 seconds. A response test is just a quick check the detector is working with a typical duration of 20 seconds. When a response test gas mix is applied If you applied all you really want to see is all gases go into alarm mode, it doesn’t matter about the value they are showing.

A readily available response test gas mixture contains 25PPM H2S, 100PPM CO, 50% LEL and 18% O2.


Published on: Jan 23, 2017 @ 08:15

Scientific Gas Australia are excited to launch the next generation 110 Series, Constant Flow Regulator. We have maintained a similar slim appearance, competitive price and improved the robustness. To ensure great quality and reliability, these regulators are now manufactured in the USA.


  • With the C-10 connection, it is suitable for the entire Portagreen range up to 116 Litres as well as most of our competitors Calgas cylinders (excluding 34 L disposable steel).
  • Versatility – all wetted surfaces have a nickel coating enabling the same regulator to be used with reactive and non-reactive gases.
  • An improved seal to minimise the risk of leakage when left connected overnight.
  • Enhanced flow accuracy – usually accurate to +/-0.01 LPM.
  • Available from stock in 0.1, 0.3, 0.5, 1.0 LPM. Other available flow rates include 0.1, 1.5, 2.0, 3.0 and 6.0LPM.
  • Ordering information: Part# 110-11P0.1, Part# 110-11P0.3, Part# 110-11P0.5, Part# 110-11P1.0, Part# 110-11P1.5, Part# 110-11P2.0, Part# 110-11P3.0, Part# 110-11P6.0

Brochure 110 Series Slimline Constant Flow Regulators

Please feel free to contact us if you need any further information.