Mercoid Series 1211

High-Pressure Float Level Control — Boiler & Steam Service

Rated to 600 psig — 500°F — Stainless Steel Wetted Parts

The Mercoid Series 1211 is a heavy-duty float level control engineered for high-pressure steam and liquid service. Designed for boiler level control, steam drums, and high-pressure process vessels, the Series 1211 features all-stainless steel wetted parts and a robust chamber construction rated to 600 psig at 500°F. The SPDT snap switch provides reliable switching for boiler feed pump control and high/low water alarms. The Series 1211 is the entry point in Mercoid's boiler-service float switch line, complemented by the Series 1221 and 1261 for even more demanding pressure and temperature requirements.

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Specifications

Service

Steam and compatible high-pressure liquids.

Wetted Materials

Body: carbon steel; Float and Trim: 304/316 stainless steel.

Temperature Limit

500°F (260°C).

Pressure Limit

600 psig (41.4 bar).

Enclosure Rating

NEMA 4X standard. Optional explosion-proof.

Switch Type

SPDT snap switch. Optional DPDT or two-stage.

Electrical Rating (Snap)

12A @ 120 VAC, 5A @ 240 VAC, 0.5A @ 125 VDC, 0.25A @ 250 VDC resistive.

Electrical Connections

Screw terminal.

Conduit Connection

3/4″ female NPT.

Process Connection

1″ female NPT (side/side or side/bottom).

Mounting Orientation

Vertical, side mounted.

Specific Gravity

0.7 minimum.

Agency Approvals

UL.

Popular Models

Model Number	Description
1211-WT-7810-C-60	High-pressure float level control, SPDT snap switch, boiler service.

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