Mercoid Level Controls
Float switches, displacer switches, and chamber-type level controls for industrial process applications. Pressures to 1250 psig, temperatures to 750°F.
Float Level Switches
Series 391/393/394
Side Mounted-Chamber
- Compact, low cost
- NEMA 4X standard
- 800 psig / 600°F
- Gravity return mechanism
Series 102/1102
Flanged Chamber
- Easy inspection access
- 300 psig / 425°F
- SG 0.60 (102) or 0.40 (1102)
- Cast iron, steel, or 316SS
Series 500
Insertion Type
- Adjustable deadband
- 400 psig / 425°F
- Direct tank mount
- Rod lengths to 24″
Series 201/203/204
Side Mounted-Chamber
- 500 psig / 750°F
- External magnet design
- UL & CSA approved
- Hermetic snap option
Series 211/213/214
Flanged Chamber
- External mount
- 450 psig / 500°F
- Steam & process service
- Multiple switch types
Series 251/253/254
Welded Chamber
- 1250 psig / 750°F
- Hermetically sealed switches
- Explosion-proof housings
- High-pressure boilers
Series 291/293/294
Welded Chamber
- Single stage
- Low cost
- Hermetically sealed snap
- Compact design
Series 225/227/228
Flanged Chamber
- Deadband 12″ to 24″
- 1000 psig / 475°F
- Hermetically sealed
- Large surge tanks
Series 221/223/224
Flanged Chamber
- External mount
- 1000 psig / 475°F
- High-pressure steam
- Multiple switch options
Series 301
Top Mounted Float
- Stem lengths to 72″
- Adjustable trip point
- Large tank service
- 150 psig / 250°F
Series 401
Top Mounted Float
- Adjustable trip point
- Multiple float options
- Economical design
- 150 psig / 250°F
Series 1211
High-Pressure Boiler
- 600 psig / 500°F
- Stainless steel wetted parts
- Boiler & steam service
- UL listed
Series 1221
High-Pressure Boiler
- 900 psig / 525°F
- ASME code available
- Steam drum service
- UL listed
Series 1261
Extreme-Service Boiler
- 1500 psig / 600°F
- ASME code standard
- Supercritical steam
- Full SS construction
Displacer Level Switches
Quick Selection Guide
| Series | Type | Max Pressure | Max Temp | Min SG | Key Feature |
|---|---|---|---|---|---|
| 391/393/394 | Side Chamber | 800 psig | 600°F | 0.80 | Compact, low cost |
| 102/1102 | Flanged Chamber | 400 psig | 425°F | 0.60/0.40 | Easy inspection access |
| 500 | Insertion | 400 psig | 425°F | 0.55 | Adjustable deadband, direct mount |
| 201/203/204 | Side Chamber | 600 psig | 750°F | 0.60 | High temp, UL & CSA |
| 211/213/214 | Flanged Chamber | 450 psig | 500°F | — | External mount |
| 251/253/254 | Welded Chamber | 1250 psig | 750°F | — | Explosion-proof available |
| 291/293/294 | Welded Chamber | — | — | — | Single stage, low cost |
| 225/227/228 | Flanged Chamber | 1000 psig | 475°F | — | Wide deadband 12–24″ |
| 221/223/224 | Flanged Chamber | 1000 psig | 475°F | — | High-pressure steam |
| 190 | Displacer | — | — | — | Single stage, top mount |
| 195 | Displacer | — | — | — | Two stage, top mount |
Need help selecting the right Mercoid level control?
Our team can match the right series to your pressure, temperature, and specific gravity requirements.