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Series 391 Side
Mounted-Chamber Type Mercoid Level Control |
| Compact,
Low Cost, Hermetically Sealed Snap Switch Option |
 Heavy duty
and low cost is the perfect description for the 391 Series
level control. Stainless steel switching mechanism uses gravity
return action instead of springs for long life. Weatherproof
enclosure is standard. Welded steel chamber is good for 650
psig (45 bar) at 600°F (315°C).
See Dimensions |
| SP.GR |
A
|
B |
1.0
0.80 |
4-3/8" (111
mm)
4-11/16" (191 mm) |
1" (25.4
mm)
1- 3/16" (112.3 mm) |
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| Applications |
| Oil refineries,
chemical plants, power generating stations, pumping stations,
heat transfer systems, sanitary/waste water facilities, drip
legs, hydraulic systems, boilers. |
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| SPECIFICATIONS |
Service: Compatible liquids.
Wetted Materials: Body: carbon steel. Float and Trim: 303
SS, 304 SS, 316 SS, and 430 SS.
Temperature Limits: Process: 600°F (315.6°C). Heat fins should
be used for process temperatures above 500°F (260°C) with mercury switches,
400°F (204°C) with snap switches, and 350°F (176.7°C) with hermetically
sealed snap switches.
Pressure Limits: 800 psig (55 bar) at 100°F (37.7°C), 650 psig
(45 bar) at 600°F (315.6°C). Higher ratings available.
Enclosure Rating: NEMA 4X. Optional general purpose or explosion-proof.
Switch Type: SPDT snap switch, hermetically sealed snap switch or mercury
switch. Optional DPDT.
Electrical Rating: Snap Switch: 12A @ 120 VAC, 5A @ 240 VAC, 0.5A @ 125
VDC resistive, 0.25A @ 250 VDC resistive. Hermetically Sealed Snap Switch: 5A
@ 125 VAC, 5A @ 240 VAC, 5A @ 30 VDC resistive. Mercury Switch: 4A @ 120 VAC/DC,
2A @ 240 VAC/DC. Higher contact ratings available for the mercury switch.
Electrical Connections: Screw terminal.
Conduit Connection: 3/4" female NPT.
Process Connections: 1" female NPT. Optional 1" socket weld hub or flange
connections.
Mounting Orientation: Vertical.
Weight: 10 lb (4.5 kg).
Agency Approvals: UL.
Specific Gravity: 0.8 minimum. Optional 0.7 minimum. |
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