FREQUENTLY ASKED QUESTIONS
How often should gas detectors be calibrated?
Typically we should refer to the manufacturers recommended schedule.
The calibration frequency also depends on usage and for more critical applications we may feel more confident by calibrating the instrument before using it. If we suspect that the instrument has been subjected to sensor poisoning, high gas concentration, mechanical shock, extreme temperature etc.then, re-calibration is recommended.
What is a bump test?
This is a quick test to verify that the installed sensors are working, the alarms function and that generally the instrument is in a fit state to measure.
It is done by applying calibration gas of sufficient concentration to place the instrument into an alarm mode.
Bump testing is not an alternative to calibration as the accuracy of the sensors are not checked and no adjustments are made.
It is highly recommended that gas detectors are bump tested before each use.
Can calibration gases be transported by air?
Calibration gas cylinders are daily transported to many world destinations by air.
They are classified as ‘Hazardous cargo’ but can travel by air providing that the airline accepts to fly such products ,they are packaged according to IATA regulations, are accompanied by the correct documents, the importing country accepts to receive such products etc. It is never easy but it can be done !
Stock locations of calibration gas cylinders.
To avoid most difficulties mentioned above, our Company holds stock of strategic calibration gas cylinders in the following areas :
b) United Kingdom
Can we ship gas monitors and spares to other parts of the world?
Yes ! We drop ships gas detection instruments, spare parts and span gases world-wide , in order to meets our customer needs.
What is the shelf life of span gases?
Reactive mixtures are calibration gas mixtures which contain at least one reactive gas. Their shelf life is commonly less than 12 months.
Reactive mixtures containing H2S as their only reactive component, have a shelf life of 2 years. Non-reactive mixtures containing one or more of such frequently used gases like N2 , O2 , CO , CH4 , i-C4H10 etc , have a shelf life of 3 years.
Always have a look at the calibration gas Cylinder label, where the expiry date is clearly stated.
Do we calibrate/service portables and fixed gas detection systems?
Yes ! We calibrate / service all Riken Keiki portables and fixed gas detection systems including on-board ships.