QA

Description:

Applications

Media: Methane, town gas, natural gas, air, inert gases
Branches: Industry, trade, chemicals, food-stuffs,*
Functions: Metering, control, regulation, registration,**

Brief information

Elster-Instromet quantometers are highly reliable gas meters which can be used throughout the entire field of flow metering and which fulfil all of the varying requirements of industrial metering. The QA and QAe quantometers work on the principle of the rotating turbine wheel. The rotation of the turbine wheel is proportional to the volume of the flowing gas and this volume (Vb/m3 ) is registered by either a mechanical (QA) or an electronic (QAe) totalizer.

Self-lubricating bearings ensure that the quantometers operate completely without any maintenance.

On account of the proven metering principle and the quality of the materials in use, the quantometers meet the highest standards. By using the quantometers in production and heating processes, it is possible to control the fl ow of gas precisely and therefore optimise the use of energy.

The QA quantometers are fi tted with a 7-digit mechanical totalizer which registers the volume Vb in cubic meters (m3).

The QAe quantometers are equipped with an electronic totalizer. Besides the normal registration of the total volume (Vb, m3), the QAe can also display the fl ow rate (Qb, m3/h), the volume of a key-day (m3 / Vb on the key-day) and the date of the key-day. This means that the user can easily calculate the gas consumption for any specific part of the building or for any cost centre at any chosen time.

Installation tips

The Elster-Instromet quantometers can be installed easily in the straight pipeline. The inlet pipe should be 3 x DN, the outlet pipe should be 2 x DN in nominal size of the meter. A filter must be connected in the inlet pipe, provided that the gas flow is not free of foreign bodies and dust. The position of the installation can be selected as required.

The flow direction is clearly marked by an arrow on the meter housing.

Interfaces/Outputs

• QA: E1 Reed switch
• QA/QAe: E 200 Namur output (in accordance with DIN EN 50227)
• QAe: Optical interface in accordance with EN 1434 3 (ZVEI- compatible)
• QAe: M-BUS interface in accordance with EN 1434-3 (Bus voltage approx. 40 VDC)
• QAe: L-BUS interface, (Bus voltage approx. 3.6 VDC, open collector output)