可靠的301系列已被證明是一種堅固經(jīng)濟的選擇，適用于側(cè)面安裝不實用的油罐頂部安裝，或用于油底殼。這些裝置有一個固定的死區(qū)，用于高或低報警或關(guān)機。這種控制可以安裝在任何關(guān)閉或打開的罐或污水坑的頂部，使用3/4" NPT連接。法蘭還有各種通徑、壓力等級和材料可供安裝。浮球可以容納液體0.5的比重和12英尺的深度。 電氣開關(guān)動作，SPST, SPDT, DPDT，或DPST，可以訂購，以滿足大多數(shù)應用?？煞謨刹讲僮?，請咨詢工廠。密封的快速動作或水銀觸點提供高或低電流或電壓要求。外殼包括通用型的NEMA 1，耐風雨的NEMA 4，防爆的NEMA 7, 9。防爆、防汽的版本結(jié)合了耐候性、防汽性和防爆的NEMA 4、7、9結(jié)構(gòu)在一個外殼內(nèi)。301系列可用于壓力容器
Minimum Specific Gravity:Dependent on float size and rod length. See Dimensional Drawing.
Temperature Limits:Ambient Temperature: 212°F (100°C); Process Temperature: up to 500°F (260°C). See model chart.
Switch Type:Snap action or mercury. See Electrical Circuits and Ratings on model chart page.
Electrical Rating:See Electrical Circuits and Ratings on Model Chart page.
Wiring Connection:G, WT or E enclosure, terminal board. EV enclosure 18" (460 mm) leads.
Enclosures:G: painted steel and aluminum; WT: painted steel, aluminum and neoprene; E: aluminum; EV: aluminum and neoprene.
Wetted Parts:See Model Chart.
Approximate Weight:301G, WT with 4-1/2" SS float, 8 ft. rod, 5" 125# cast iron flange: approximately 35 lb (16 kg) with E, EV enclosure: 39 lb (17.7 kg).
Suggested Specification:Liquid level control shall be top mount, float operated with fixed deadbａnd for alarm service, (insertion depth, float and flange type to be specified). Circuit shall be hermetically sealed (SPST) (SPDT) DPDT snap action (mercury) switch. Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosion-proof - vapor proof).
Model Chart
| EXAMPLE | 301 | G | 4810 | AS | 15 | 1.0 | 2 | STW | 301-G-4810-AS-15-1.0-2-STW Top mount Float Type Level Control, NEMA 1 enclosure, single stage mercury switch, 3-1/2" x 6" 304SS float, 316SS stops, 304SS extension, 1.0 specific gravity, 4" 125# cast iron flange, with SS tag. |
| SERIES | 301 | Top Mount Float Type Level Control | |||||||
| ENCLOSURE | G | General Purpose, NEMA 1 | |||||||
| WT | Weather tight, NEMA 1, 2, 3, 4, 4X | ||||||||
| E | Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G, Div. I & II; CSA approved Groups C, D, E, F, G only | ||||||||
| EV | Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G, Div. I & II; CSA approved Groups C, D, E, F, G only | ||||||||
| CIRCUITS | 48XX | Single Stage Mercury Switch, see chart A | |||||||
| 78XX | Single Stage, Snap Switch, see chart A | ||||||||
| 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 | ||||||||
| FLOAT/ STOP/ GUIDE ROD | 00 | No Float, No Guide Rod | |||||||
| AS | 3-1/2" x 6" 304SS Float, 316SS Stops, 304SS Extension | ||||||||
| BS | 4-1/2" Copper Float, 316SS Stops, 304SS Extension | ||||||||
| CS | 4-1/2" 304SS Float, 316SS Stops, 304SS Extension | ||||||||
| DS | 7" 304SS Float, 316SS Stops, 304SS Extension | ||||||||
| ES | 7" Copper Float, 316SS Stops, 304SS Extension | ||||||||
| A0 | 3-1/2" x 6" 304SS Float, 316SS Stops, No Extension | ||||||||
| B0 | 4-1/2" Copper Float, 316SS Stops, No Extension | ||||||||
| C0 | 4-1/2" 304SS Float, 316SS Stops, No Extension | ||||||||
| D0 | 7" 304SS Float, 316SS Stops, No Extension | ||||||||
| E0 | 7" Copper Float, 316SS Stops, No Extension | ||||||||
| OPERATING POINT | XX | ≥12 or ≤96. See Dimensional Drawing. | |||||||
| SPECIFIC GRAVITY | 1.0 | 1.0 Specific Gravity | |||||||
| .9 | 0.9 Specific Gravity | ||||||||
| .82 | 0.82 Specific Gravity | ||||||||
| .75 | 0.75 Specific Gravity | ||||||||
| .62 | 0.62 Specific Gravity | ||||||||
| .50 | 0.50 Specific Gravity | ||||||||
| FLANGE | 0 | No Flange | |||||||
| 7 | 4" 150# RF Carbon Steel | ||||||||
| 8 | 5" 150# RF Carbon Steel | ||||||||
| 9 | 6" 150# RF Carbon Steel | ||||||||
| 10 | 8" 150# RF Carbon Steel | ||||||||
| 12 | 4" 300# RF Carbon Steel | ||||||||
| 13 | 5" 300# RF Carbon Steel | ||||||||
| 14 | 6" 300# RF Carbon Steel | ||||||||
| 15 | 8" 300# RF Carbon Steel | ||||||||
| 7S | 4" 150# RF 316SS | ||||||||
| 8S | 5" 150# RF 316SS | ||||||||
| 9S | 6" 150# RF 316SS | ||||||||
| 10S | 8" 150# RF 316SS | ||||||||
| 12S | 4" 300# RF 316SS | ||||||||
| 13S | 5" 300# RF 316SS | ||||||||
| 14S | 6" 300# RF 316SS | ||||||||
| 15S | 8" 300# RF 316SS | ||||||||
| OPTIONS | HF | Heat Fins | |||||||
| R | Manual Reset - Single Stage | ||||||||
| R1 | Manual Reset - Lower Stage 2-Stage Control | ||||||||
| STW | SS Tag Wired | ||||||||
| 01 | Breather Only (E-Housing only) | ||||||||
| 02 | Drain Only (E-Housing only) | ||||||||
| 12 | Breather and Drain (E-Housing only) | ||||||||
| 14210.40 | Spec. 14210 for Sch 40 | ||||||||
| 14210.80 | Spec. 14210 for Sch 80 | ||||||||
| 23720 | Fungus Proofing |
*Not supplied if insertion depth is less that 15".
