Brahma Relay RE3 SP

FLAME DETECTOR FOR GAS TYPE RE3 DESCRIPTION The RE3 control is suitable to verify the presence of flame on gas burners. In fact it can use either a UV phototube or an electrode to exploit the flame rectification effect (ionization). FEATURES − in accordance with EN 60730; − electrical service life at max. declared loading > 250.000 operations; − compact and easy installation; − connecting socket with screws or fast-on terminals (types A, B, N and T); − signalization with LEDs of different colour: green (POWER) and red (FLAME). MAIN APPLICATIONS The RE3 flame detector is mainly used for industrial applications and for the installation of semiautomatic ignition and control systems, when it is necessary to control simultaneously and sequentially several burners. The presence of LEDs to signalise the operation also permits the use of RE3 control simply as flame detector. OPERATION Supply is signalled by the turning on of the green coloured LED (POWER) fitted on the front of the plastic enclosure. A second LED, red coloured, placed next to the first one, turns on when the flame detection has occurred. This event corresponds to the switching on of the independent contacts available in output. 4071_r02 1/4 OVERALL DIMENSIONS (*) It depends on the socket type: Fig.2 59.5 socket A 63.5 socket B 62.8 socket N and T socket A and B socket T (*) It depends on the socket type: 5 socket A 9 socket B Fig.3 The phototube UV2/N has an intermediate sensitivity between standard and selected UV1. As regards the phototube life, we suggest to replace it after 10.000 hours to avoid the danger of a “flame on” signal also after the flame has been extinguished, which is likely to happen when the tube gets too old. DETECTION ELECTRODE The detection electrode we produce can be supplied in different shapes and dimensions (see Fig.4). socket N Fig.1 This control can use the connecting sockets with screw terminals mod. A, B, N or socket mod. T. for fast - on terminals, which couples with lateral bolted enclosure. Please note that socket type B is higher than type A and its terminals can hold a greater number of cables. Fig.4 TECHNICAL DATA ACCESSORIES - Supply: 220V-50/60Hz The users’ different requirements regarding flame detection on request: 240V-50/60Hz for gas systems, can be met by using the following probes 110V-50/60Hz of our production: 120V-50/60Hz - UV1 standard phototube (Fig.2); - Operating temperature: 0 ÷ 60°C - UV1/A selected phototube; - Humidity: 95% max. at 40°C - UV1/H high sensitivity phototube: - Case Protection Degree: IP40 Case: nylon - Power consumption in running: 3 VA Case diameter: mm 22 - Contact rating: 5A 250 V AC ( cosϕ = 1.0) Case length: mm 85 3A 250 V AC ( cosϕ = 0.4) Cable length: mm 600 (standard) 5A 30 V DC - External Fuse (F): 50 mA T - UV2/N (Fig.3): - Minimum ionization current: 0,5µA Case: nylon - Recommended ionization current: Case diameter: mm 17 with UV tube: > 15µA Case length: mm 76 with electrode: > 5µA Cable length: mm 600 (standard) - Reaction time: < 1s 2/4 4071_r02 Weight: with A socket 280 g with B socket 300 g with T socket 250 g with N socket 290 g CONSTRUCTION The plastic material made enclosure protects the control from possible damages depending on crashes, openings, dust deposit, contact with outside ambient. Two LEDs of different colour, GREEN for power on and DETECTION RED for flame on, fitted on the upper side of the enclosure, PROBE permit an immediate identification of the state of burner and control; a version without signalling LEDs is also available. DIRECTIONS FOR INSTALLATION − Connect and disconnect the control only with supply off. − The control can be assembled in every position. − Avoid exposure to dripping water. Fig.6 − Ventilation with the lowest temperature ensures the longest life of the control. Fig.7 shows the diagram suitable to the installation of a − Make sure that you are using the correct type and code semiautomatic system for gas burners. For the flame before installing or replacing the control. detection, both an ionization electrode or a phototube can be used. ELECTRICAL INSTALLATION Acting on the manual start button PM (with two contacts − Every contact must be protected with a fuse of the fast normally open) supply is given to the TR ignition blow type suitable to the loads connected; transformer and the EV 1 gas valve; the manual pressure − Before starting the control, check cables and on the button must be kept until the flame is built and connections carefully (see Fig.5). Wrong stable. connections can damage the control and compromise the safety of the application; APPLICATION EXAMPLES − A suitable degree of protection must be guaranteed; − The relevant electrical safety standards must be respected. NOTE1 NC COM NA NA COM NC BLUE 5A 5A UV BRAHMA TYPE RE3 MADE IN ITALY NOTE1: WIRE MARKED WITH NUMBER 8 Fig.7 DET. PROBE NC COM NA NA COM NC By releasing the button PM, the ignition transformer is turned off and the operation continues until one of the following situations occurs: - action on the manual stop button PA; - intervention of the thermostat T; - flame failure. In any situation, the operation can be reset only by manual 5A 5A intervention on start button PM. In the same picture is also represented a duty example of the second available contact, to detect the flame in BRAHMA TYPE RE3 MADE IN ITALY distance. Fig.8 represents two connection diagrams for using the Fig.5 RE3 flame detector with the control box for automatic gas burners, model CM391 belonging to the EUROBOX series CHECKING AT START (see the relevant leaflet). Always check the control before the first start and also after a long period of system off. Before any ignition attempt make sure that the combustion chamber is free from gas. Then check that the level of the flame signal is sufficient (see Fig.6a and 6b for the measuring). 4071_r02 3/4  BURNER 1 BURNER 2 LIVE NEUTRAL (a) LIVE NEUTRAL (b) Fig.8 The diagram in Fig.8a differs from the one in Fig.8b for the presence of fan control and air pressure switch. This connection permits the ignition of two burners in sequence, with cross checking of the “flame on” state. A contact of the internal relay of RE3 is used to check the efficiency of the…