ABBModels EL3020, EL3040

Protective Lead Connection

The protective lead (ground) should be attached to the protective lead connector before any other connection is made

Risks of a Disconnected Protective Lead

The device can be hazardous if the protective lead is interrupted inside or outside the device or if the protective lead is disconnected.

Risks Involved in Opening the Covers

Current-bearing components can be exposed when the covers or parts are removed, even if this can be done without tools. Current can be present at some connection points.

Risks Involved in Working with an Open Device

All work on a device that is open and connected to power should only be performed by trained personnel who are familiar with the risks involved.

When Safe Operation can no Longer be Assured

If it is apparent that safe operation is no longer possible, the device should be taken out of operation and secured against unauthorized use. The possibility of safe operation is excluded:

 If the device is visibly damaged, 

 If the device no longer operates, 

 After prolonged storage under adverse conditions, 

 After severe transport stresses.

Measures of the manufacturer

The following measures ensure that the enrichment of combustion gas or an explosive mixture of combustion gas and ambient air cannot occur inside the gas analyzer during normal operation:

 The seal integrity of the combustion gas feed path is checked for a leakage rate of < 1 × 10–4 hPa l/s before delivery. 

 The combustion gas/air mixture (before and after the ignition point) is diluted in the detector with compressed air. 

 The combustion gas feed is not connected to the supply during startup until the internal nominal pressures have been set. 

 The combustion gas feed is switched off if the internal nominal pressures cannot be set during the ignition phase (e.g. because of insufficient compressed air or combustion air feed). 

 The combustion gas feed is switched off after several unsuccessful ignition attempts. 

 If the flame goes out during operation the combustion gas feed is switched off if the following ignition attempts are unsuccessful. The interior of the gas analyzer is not assigned to an (explosion protection) zone; no explosive gas mixture can escape from it to the outside.

Conditions to be complied with by the end user

The end user must comply with the following prerequisites and conditions to ensure safe operation of the gas analyzer:

 The gas analyzer may be used for the measurement of flammable gases provided that the flammable portion does not exceed 15 vol.% CH4 or C1 equivalents. 

 The relevant safety regulations for working with flammable gases must be complied with. 

 The gas connection diagram (see page 64) must be complied with when connecting the combustion gas and combustion air. 

 The combustion gas feed path in the gas analyzer may not be opened! The combustion gas feed path can become leaky as a result! Escaping combustion gas can cause fires and explosions, also outside the gas analyzer! 

 If the combustion gas feed path in the gas analyzer has been opened, however, it must always be checked for seal integrity (see page 118) with a leak detector after it has been sealed again (leakage rate < 1 × 10–4 hPa l/s).

 The seal integrity of the combustion gas line (see page 116) outside the gas analyzer and the combustion gas feed path (see page 118) in the gas analyzer must be checked on a regular basis. 

 The maximum combustion gas flow (see page 30) may not be exceeded. 

 The maximum pressures of combustion gas and combustion air (see page 30) may not be exceeded. 

 The combustion gas flow rate must be limited to a maximum of 10 l/h of H2 or 25 l/h of H2/He mixture. For this purpose, the end user has to provide suitable measures (see page 30) outside the gas analyzer. 

 A shut-off valve (see page 30) must be installed in the combustion gas supply line to increase the safety in the following operating states: 

 Shutting down the gas analyzer, 

 Failure of the instrument air supply, 

 Leakage in the combustion gas feed path inside the gas analyzer. This shut-off valve should be installed outside the analyzer house in the vicinity of the combustion gas supply (cylinder, line). 

 If there is no automatic shut-off of the combustion gas supply to the gas analyzer in case of an instrument supply failure, a visible or audible alarm must be triggered (see page 129). 

 When measuring flammable gases, it must be made sure that in case of a failure of the instrument air supply or of the analyzer module itself the sample gas supply to the analyzer module is shut off and the sample gas path is purged with nitrogen. 

 The unobstructed exchange of air with the environment must be possible around the gas analyzer. The gas analyzer may not be directly covered. The openings in the housing towards the top and at the side may not be closed. The distance to laterally adjacent built-in components must be at least 4 mm. 

 If the gas analyzer is installed in a closed cabinet, adequate ventilation of the cabinet must be provided (at least 1 change of air per hour). The distance to adjacent built-in components towards the top and at the side must be at least 4 mm.