suitable for installation in Ex-Zone 2; ATEX II 3 G EEx nZ II B+H2 T4

Analyzer for the determination of the Wobbe-Index and the stoichiometric

air demand for complete combustion of fuel gases (LPG/Syngas-mixtures);

The instrument offers two isolated outputs 4...20 mA (ranges suggested) :

Range Unit

Wobbe-Index Wu

Air Demand (CARI)

Note : Within limits to be agreed upon, the measuring ranges

can be adjusted later, should the gas specifications be changed.

Operating Principle : Mixing of the fuel gas with clean combustion

air in a defined mixing ratio; Catalytic oxidation of the gas; determination

of the residual Oxygen after combustion/oxidation; determination of the

calorific properties via the established calibration routine;

Calibration System :

Manually started and automatically executed procedure is standard

(with HIGH and LOW calibration gas) ;

Response time : 3.…7 seconds } depending upon

T90-time : 10...18 sec (analyser only) } gas viscosity

Installation in a three-partition compartment

Part A : IP 55 Housing for electronic analyser components;

Dimensions of part A ca. 400*650*400 mm

Ex-protection via a Zone 2 certified purge unit

Part B : IP 55 Housing with all pneumatic elements for mixing of the

gas with air; for controlling the gas flow and the application

of calibration gases; control of pressure and flow;

Dimensions : w*h*d ca. 400*650*400 mm

The By-pass gas and the gas from the double-block-and-bleed

venting of the valves are flammable gas mixtures must be led

into a safe vent line, free from any back-pressure;

this outlet line is protected by a flame suitable barrier.

All parts in this compartment are either non-electric or have a suitable

Ex-protection/certificate.

Part C : IP55 housing, containing the catalytic reactor and the Oxygen sensor

for the measurement of the Air Demand and the Wobbe-Index.

This compartment contains all components with higher

temperature, but at ambient pressure only ;

Ex-Protection : continuous purge [pz]; [EN 60079-15:2003 #23];