1. Pilot Burnerwith Gas Regulator. Model-l 000/1 This is a standard burner which is used to light the main burner as per Fig. 2. This consists of mixer (B) anp adjustable orifice (C).This is supplied with pilot (Fig.3) which houses the sensing element of low temperature Switch. The gas to the pilot burner is supplied by a W' regulator Model 400x (Fig. 4 on page 2).
2. low Temperature Switch. Model 1100/5 This consists of mercury bulb with capillary tube. (Refer Fig. 5, on Page 2).The mercury in the bulb expands with rise in temperature,which extends piston stem connected on the other side of mercury bulb.The stem is connected to the knob of micro valve through linkage.The air (output pressure) at the output port of the micro valve is Zero when the burner is OFF or Maximum when the burner is ON. The sensing element of low temperature switch is housed in thermowell welded on pilot (Figure 3) for sensing temperature of pilot burner flame.
3. Panel for pneumatic alarm and Auto/Manual Switch Model-1100/3 The Panel consists of following: (30) Auto/Manual Switch: During normal condition, switch is at AUTO. When pilot burner goes off, horn starts blowing. The switch is shifted to MANUAL to avoid continuous blowing of horn. (3b) Panel Indicator : This indicator indicates 0% (OFF) when the burner is off and shows 100% (ON) when the burner is on. (3c) Horn: The pneumatic horn blows when pilot burner extinguishes.
4. Gas Shut Off Valve: Model 11