Mercoid Series 391/393/394
Side Mounted-Chamber Type Level Control
Compact, Low Cost, Hermetically Sealed Snap Switch Option
The Series 391/393/394 is the perfect description for a compact, low cost level control with hermetically sealed snap switch option. The stainless steel switching mechanism uses gravity return action instead of springs for long life. Weatherproof enclosure is standard. The welded steel chamber is rated for 650 psig (45 bar) at 600°F (315°C), making it heavy duty yet economical.
Specifications
Service
Compatible liquids.
Wetted Materials
Body: carbon steel; Float and Trim: 303 SS, 304 SS, 316 SS, and 430 SS.
Temperature Limit
Process: 600°F (315.6°C). Heat fins required above 500°F (mercury), 400°F (snap), 350°F (hermetic snap).
Pressure Limit
800 psig (55 bar) at 100°F; 650 psig (45 bar) at 600°F. Higher ratings available.
Enclosure Rating
NEMA 4X standard. Optional general purpose or explosion-proof.
Switch Type
SPDT snap switch, hermetically sealed snap switch, or mercury switch. Optional DPDT.
Electrical Rating (Snap)
12A @ 120 VAC, 5A @ 240 VAC, 0.5A @ 125 VDC, 0.25A @ 250 VDC resistive.
Electrical Rating (Hermetic Snap)
5A @ 125 VAC, 5A @ 240 VAC, 5A @ 30 VDC resistive.
Electrical Rating (Mercury)
4A @ 120 VAC/DC, 2A @ 240 VAC/DC. Higher ratings available.
Electrical Connections
Screw terminal.
Conduit Connection
3/4″ female NPT.
Process Connection
1″ female NPT. Optional 1″ socket weld hub or flange.
Mounting Orientation
Vertical.
Specific Gravity
0.8 minimum. Optional 0.7 minimum.
Weight
10 lb (4.5 kg).
Agency Approvals
UL (none on mercury switch).
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