Martin Wardell of independent metering supplier MWA Technology and Steve Lewis of Apex Engineers are concerned the national gas industry standard is being ignored.
Mr Wardell said: “There’s a growing requirement for real time monitoring of gas consumption among owners and landlords of large retail and commercial companies.
“These companies are turning to energy monitoring companies – many not from the gas industry - to install equipment which enables them to connect to the third party fiscal meters and send consumption data directly to a central point.
“In order to do this they connect to a pulse output socket in the meter, but making this connection is regulated and should only be undertaken by an authorised person using a safe method.
“Such a person is required to follow national guidelines, which include a site survey, adherence to safety procedures and the provision of suitable documentation. It seems many contractors are completely unaware of this.”