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Mercoid Series 291/293/294

Welded Chamber Level Control — Single Stage, Low Cost

Mercoid Series 291/293/294 Welded Chamber Level Control

Hermetically Sealed Snap Switch — Compact Welded Construction

The Mercoid Series 291/293/294 is a single-stage welded chamber level control offering reliable performance at an economical price point. The welded carbon steel chamber provides durable construction for demanding process environments, while the hermetically sealed snap switch ensures long contact life and resistance to moisture and contaminants. The compact design is ideal for applications where space is limited and a single-stage level detection point is sufficient. The 293 and 294 variants offer flanged process connections for higher-integrity installations on pressure vessels and boilers.

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Specifications

Service
Compatible liquids.
Wetted Materials
Body: carbon steel, optional 316 SS; Float and Trim: 303/304/316/430 SS.
Temperature Limit
Process: 500°F (260°C). Heat fins required above 350°F (hermetic snap).
Pressure Limit
600 psig (41 bar) at 100°F; 500 psig (34 bar) at 500°F.
Enclosure Rating
NEMA 4X standard. Optional general purpose or explosion-proof.
Repeatability
±1/4″ (6.4 mm).
Switch Type
Hermetically sealed snap switch, SPDT standard. Optional DPDT.
Electrical Rating (Hermetic Snap)
5A @ 125 VAC, 5A @ 240 VAC, 5A @ 30 VDC resistive.
Electrical Connections
Screw terminal.
Conduit Connection
3/4″ female NPT.
Process Connections
291: 1″ female NPT and 1″ socket weld hub; 293: 1-1/2″ 300 lb ANSI flange; 294: 1-1/2″ 600 lb ANSI flange.
Set Point Adjustment
±1″ (25.4 mm).
Mounting Orientation
Vertical.
Specific Gravity
0.6 minimum.
Weight
291: 28 lb (12.7 kg); 293: 34 lb (15.4 kg); 294: 40 lb (18.1 kg).
Agency Approvals
UL and CSA.

Popular Models

Model NumberDescription
291-WT-7810-C1-60Welded chamber level control, single stage, SPDT hermetic snap switch, NPT connection.
293-WT-7810-C1-60Welded chamber, 1-1/2″ 300 lb ANSI flange, SPDT hermetic snap switch.
294-WT-7810-C1-60Welded chamber, 1-1/2″ 600 lb ANSI flange, SPDT hermetic snap switch.

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