The maximum operating temperature for the flame sensor is 302° F (150° C). If the peak ambient temperature at the location of the sensor exceeds this then cooling will be required. There are three methods available for cooling: Water-cooling, air-cooling with ambient air, and air-cooling with pressurized air.
Water cooling requires the use of a water cooling coil Part Number sp-566, GE Part Number 353B3490G001. The water-cooling coil requires water at a temperature of 50° F to 135° F (10° C to 57° C) at a flow rate of 1.0 gpm (3.8 lpm) per sensor. When using water-cooling the flame sensor can be operated to an ambient temperature of (455°F) 235°C. Air-cooling with ambient air can be used in installations where the enclosure is cooled with forced air. This would be typical of LM2500 and LM6000 aircraft engine applications.
The air velocity at the sensor must be 5 ft/sec (1.5 m/sec), or greater, at a temperature of 50° F (10° C), or less, above outside ambient. Under these conditions the sensors will operate at outside ambient temperatures up to 140° F (60° C). Air-cooling with pressurized air requires the use of Air-Cooling Can. GE Reuter-Stokes Part Number RS-E2- 0259 (GE Part Number 07482SOCNL44821P01). The Air-Cooing Can is installed in the same manner as the water-cooling coil. The Air-Cooling Can requires 25-psi (170 kPa) minimum at 120° F (49° C) maximum. Do not complete step 2 in the “FLAME SENSOR AND WATER COOLING JACKET INSTALLATION INSTRUCTIONS” on the next page. Leave the sensors installed hand tight until after the sensor checkout described in Section 3.3.
The sensors are connected to the turbine junction box with connector cable RS-E2-0285 or equivalent. The RS-E2-0285 consists of black, white and green wires twisted and shielded. All wiring must be in grounded conduit. The green wire must be connected to earth ground at the junction box. Do not connect the shields to each other or to earth ground at any location. The shields should be individually jumped through all junction boxes and connected to the proper ground terminal at the Controller. The polarity of the cable is as follows; white is positive and black is negative/signal return. Reverse polarity will not damage the sensor. Signal cable from the junction box to the Controller should be 18 gauge (1.02 mm) twisted shielded pair. The extension cable from the junction box to the Controller is the customer’s responsibility.
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