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INSTALLATION - 45CM1 PHOTOCELL MOUNT
MAINTENANCE - TM-5-3895-374-24-2_428

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 FLAME SAFEGUARD Test for Incandescent Refractory Hold-In with Photocell Detector Type 45CM 1 Photocell Scanners are actuated by light energy.  To assure that the flame failure response time is not extended by radiation from incandescent refractory, the following test is recommended 1. Operate   the   burner,   following   the   burner   manufacturer’s   instructions,   until   the   refractory   is   at maximum operating temperature. 2. Turn off the main fuel supply manually. 3. Observe the display flame signal which must drop below 10 within 4 seconds. 4. If the flame failure response time exceed 4 seconds, reduce the amount of light at the Photocell with a screen, an orifice, or a filter lens, until the normal flame failure response is obtained. INSTALLATION - 69ND1 FLAME  ROD The  69ND1  flame  rod  proves  a  gas  pilot  flame  and/or  main  gas  flame.    It  is  a  spark  plug  type  unit consisting of 1/2" NPT mount, a KANTHAL flame rod, a glazed porcelain insulating rod holder and a spark plug connector for making electrical connections.  The 69ND1 is available in 12," 18" or 24" lengths. The  flame  rod  may  be  located  to  monitor  only  the  gas  pilot  flame  or  both  the  gas  pilot  and  main  gas flames.  It is mounted on a 1/2" NPT coupling. The following instructions should be observed: 1. Keep flame rod as short as possible. 2. Keep flame rod at least 1/2" from any refractory. 3. Flame  rod  should  enter  the  pilot  flame  from  the  side  so  as  to  safely  prove  an  adequate  pilot  flame under all draft conditions. 4. If the flame is nonluminous (air and gas mixed before burning), the electrode tip should extend at least 1/2" into the flame, but not more than half-way through. 5. If the flame is partly luminous, the electrode tip should extend only to the edge of the flame.  It is not necessary to maintain absolutely uninterrupted contact with the flame. 6. It  is  preferable  to  angle  the  rod  downward  to  minimize  the  effect  of  sagging  and  to  prevent  it  from coming in contact with any object. 7. An  adequate  grounding  surface  for  the  flame  must  be  provided.    The  grounding  surface  in  actual contact with the flame must be at least four times greater than the area of the portion of the flame rod in  contact  with  the  flame.    It  is  essential  to  adjust  the  flame  rod  and  ground  area  ratio  to  provide  a maximum signal reading. Note: Interference from the ignition spark can alter the true signal reading by adding to, or subtracting from it.  This trend sometimes may be reversed by interchanging the primary wires (line voltage) to the ignition transformer.  This interference can also be reduced by the addition of grounded shielding between the flame rod and ignition spark. (page 3 - 1061)







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