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_ %./ <br /> APPLICATION <br /> The Model 40 Type 4 Overfill/High Level Alarm is designed to warn of liquid overfills in any type of tank or vessel.The tank may <br /> be installed above or below ground or in the vertical or horizontal position.Due to Its versatility the Model 40 Alarm may be <br /> used for various applications ranging from small waste oil tanks to large bulk storage facilities. <br /> moo"7'A�K AS <br /> i, <br /> at <br /> IV,..�t _ i <br /> , 6 � 4' S043r.`t i3`r::7 <br /> Ifilill, <br /> a z x tx <br /> 3 F � <br /> %CK'Fi r-F 1- t' , <br /> PRESSURE <br /> THE ALARM SYSTEM 9WITWH <br /> THE SYSTEM CONSISTS OF THE FOLLOWING: <br /> THE ALARM UNIT; Consists of a NEMA 1 enclosure complete with 2 status !fights (GREEN-NORMAL/POWER ON, <br /> RED-ALARM), audible horn, relay, silencer and:est switches, and printed circuit board. <br /> 2 PRESSURE SWITCH: Explosion-proof and weather-proof switch intended to be mounted at the tank top.Connected <br /> electrically to the alarm box with 3 wires and pneumatically to the tank by the tank assembly unit and equalizing line. <br /> P MODEL 41 TANK ASSEMBLY UNIT:Consists of a 2" NPT tank top bushing with a 1"diameter by 9"long air bell. 114" <br /> ( . O.D. copper tube transmission line, and 3/16" O.D. copper tube equalizing line, <br /> I ALAW61 MX <br /> o <br /> 'C=L we <br /> r•Mv o <br /> OPE AWaiI P1 T[Y�16FA ::CrN16 MG <br /> wlrtf5 <br /> The tank overfill alarm system Is fully automatic, has no W y <br /> ,:roving parts or electricity within the tank, and operates on i- � � �-�, 1� :wn[sau <br /> the principles of hydrostatics, <br /> The sensing device for the alarm system is an open ended air <br /> bell and equalizing ilne that l.s installed at the top of the tank, raNK As w* <br /> This device, (tank assembly unit) is connected to a pressure r� <br /> switch via 1/4"and 3/16"O.D.tubing.Asa rising liquid level <br /> covers about 3/4"of air bell,the Increase in pressure of She <br /> trapped air activates the pressure switch, which in turn r <br /> activates an audio and visual alarm. The audible alarm Is <br /> silenced by a pushbutton silencing circuit, and the visual <br /> alarm automatically resets when the:liquid level drops below <br /> the air bell.An alarm test pushbutton permits verification that <br /> the alarm circuits function correctly, <br />