700 Series Models 710-PR-1/2; 710-FR-1/2; 710-UV-1/2, 737, etc Suitable for Small and Medium Burners, with one or two fuel valves. Compact size (70(L) x 110(B) x 100(H)) in plug-in enclosure for easy field replacement. Field selectable options for Purge time, Retrial and Flase Flame Check. Flame Sensing: Photo Resistor (PR models); Flame Rod (FR models) and UV Sensor (UV models) 300 / 200 Series Models 307-GI-S/107-SGI, 307-GE-CD/107-CGED, 207-GI-VT, 207-FRD-AP-21, etc Suitable for Medium to Large Gas fired Burners used in Boilers and Furnaces. The features include: Pre-purge, Post-purge, Air Pressure switch, Pilot & Main valves, Damper control, etc. Housed in a (150(L) x 70(B) x 110(H)) industry standard moulded box suitable for DIN rail mounting. Flame Sensing:UV sensor (300 series models) and Flame Rod (200 series models) 100 Series: Models 107-S; 107-S-30; 107-C, 107-M, 107-TU, LS-107, 150-P6, etc Suitable for Medium to Large Oil fired Burners. Work horse of the Boiler Industry since 1986. The features include: Pre-purge, Post-purge, Oil Pump, One/Two valves and Damper control, etc. Housed in a (150(L) x 70(B) x 110(H)) industry standard moulded box suitable for DIN rail mounting. Flame Sensing: Photo Resistor Flame Amplifiers Models FE-01; FRR-01, UV-FR-01, UV-FR-21, etc Provides visual flame indication and C/O Relay Contact for control purposes. when the flame is sensed. Housed in a (52(L) x 70(B) x 110(H)) industry standard moulded box suitable for DIN rail mounting. Flame Sensing: Photo Resistor (FE-01); Flame Rod (FRR-01) and UV Sensor (UV-FR-xx)