C1-40:Minimum specific gravity 0.40. Process pressure 1250 psi (86 bar) at 100°F (38°C) to 500°F (260°C).
Temperature Limit:Ambient Temperature: 212°F (100°C); Process Temperature: up to 500°F (260°C).
Switch Type:Snap action or mercury. See Model Chart.
Electrical Rating:See Model Chart.
Wiring Connections:G, WT or E enclosure: terminal block; EV enclosure: 18" (460 mm) leads.
Process Connection:Combination 1" NPT/socket weld hubs or flanges. See Model Chart.
Enclosures:G: painted steel and aluminum; WT: painted steel, aluminum and neoprene; E: aluminum; EV: aluminum and neoprene.
Wetted Parts:C1 construction. Chamber: carbon steel; Trim: 303SS, 304SS, 316SS and 430SS.
Weight:1251: 40 lb (18 kg); 1253: 50 lb (22.7 kg); 1254: 57 lb (25.8 kg).
| EXAMPLE | 1251 | WT | 7810 | C1 | 40 | | 1251-WT-7810-C1-40 Liquid Level Control, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 1250 psig (86 bar) at 100°F (38°C), 1250 psig (86 bar) at 500°F (260°C), side/bottom process connections, 1" NPT/socket weld hubs, minimum specific gravity 0.40. |
| CONNECTION | 1251 | | | | | | One Horizontal and One Vertical 1" Socket Weld or 1" NPT Combination Hub |
| 1253 | | | | | | One Vertical and One Horizontal Flanged Connection |
| 1254 | | | | | | Two Vertical Flanged Connections |
| 1254T | | | | | | |
| ENCLOSURE | | G | | | | | General Purpose, NEMA 1 |
| | WT | | | | | Weatherproof, NEMA 3R, 4, 4X |
| | E | | | | | Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G |
| | EV | | | | | Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G |
CIRCUITS
(for electrical circuits
see charts A & B below) | | | 48XX | | | | Single Stage Mercury Switch, see chart A |
| | | 48XX-XX | | | | Two Stage, Mercury Switch, see chart A |
| | | 78XX | | | | Single Stage, Snap Switch, see chart B |
| | | 78XX-XX | | | | Two Stage, Snap Switch, see chart B |
| | | 78XXHM | | | | Hermetically Sealed Snap Switch, see chart B |
| | | 98XX | | | | Single Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B |
| | | 98XX-XX | | | | Two Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B |
| CHAMBER MATERIAL | | | | C1 | | | Carbon Steel Body |
| | | | C216 | | | 316SS Body |
| | | | HFC1 | | | Heat Fins & Carbon Steel Body |
| | | | HFC216 | | | Heat Fins & 316SS Body (1251, 1253 only) |
MINIMUM
SPECIFIC
GRAVITY | | | | | 40 | | 0.40 Specific Gravity (1251 only) |
| | | | | 140 | | 0.40 Specific Gravity & 150# Flange (1253, 1254 only) |
| | | | | 340 | | 0.40 Specific Gravity & 300# Flange (1253, 1254 only) |
| | | | | 640 | | 0.40 Specific Gravity & 600# Flange (1253, 1254 only) |
| OPTIONS | | | | | | R | Manual Reset, Single Stage |
| | | | | | R1 | Manual Reset, Lower Stage 2-Stage Control |
| | | | | | R2 | Manual Reset, Upper Stage 2-Stage Control |
| | | | | | R3 | Manual Reset, Both Stages 2-Stage Control |
| | | | | | STW | SS Tag Wired |
| | | | | | 01 | Breather Only (E-Housing only) |
| | | | | | 02 | Drain Only (E-Housing only) |
| | | | | | 12 | Breather & Drain (E-Housing only) |
| | | | | | 23720 | Fungus Proofing |
