SUT-100
Flame Scanner
A flame scanner detects the existence of a flame inside the combustion chamber, and aims at preventing fuel injection into the combustion chamber in the absence of flame formation. If the flame goes out, the system protection will operate in one second and issue the fuel valve closing command. This action prevents from fuel accumulation in the combustion chamber and possible explosion.
SUT-100 Flame Scanner
UV Flame Scanner | Sensor |
Stainless steel 316 | Housing |
Quartz glass | Window |
3/4´´ internal NPT | Mounting |
Lead colors: YellowGreen (Body) Brown (+) Blue (-) | Cable characteristics |
5m or 10m | Lead length |
-40°C to +100°C (For UV Sensor type 1) | Working Temperature (Without Cooling) |
-40°C to +150°C (For UV Sensor type 2) | |
IP67 | Int. Protection Marking |
185-260nm | Average Spectral Sensitivity |
Pulse 100sec-1 ± 25sec-1 | Output |
< 10min-1 | Background |
< 200ms | Response Time |
325VDC ± 25VDC (For UV Sensor type 1) | Power Requirement |
500VDC ± 50VDC (For UV Sensor type 2) |

SUT-100 Amplifier
20 … 25VDC | Input Voltage |
30 mA (when flame is not detected) 50 mA (While flame is detected) | Input Current |
325VDC (For UV Sensor type 1) | Output Voltage |
500VDC (For UV Sensor type 2) | |
Maximum 0.5mA | Output Current |
-20°C to +70°C | Working Temperature |
Pin1: Flame Relay N.O. (or Open Collector with 3.3kW pulled up resistor) | Connector Description |
Pin2 & Pin3 : Flame Relay COM (or GND) | |
Pin4: Flame Relay N.C. | |
Pin5 & Pin6 : +24V | |
Pin7 & Pin8 : GND | |
Pin9 & Pin10 & Pin 11 & Pin12 : Earth | |
Pin13 & Pin14 : Anode (+) | |
Pin15 & Pin16 : Cathode (-) |

Flame Scanner Ordering Table
Feature | Part Number |
SUT-100 Flame Scanner with UV sensor type 1 | SUT-100-S18CX7 |
SUT-100 Flame Scanner with UV sensor type 2 | SUT-100-S41CX7 |
Flame Scanner Amplifier Ordering Table
Feature | Part Number |
SUT-100 Amplifier for UV sensor type 1 | SUT-100-A8D124 |
SUT-100 Amplifier for UV sensor type 2 | SUT-100-A7D124 |