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Dwyer 391/393/394系列侧安装式液位控制
Dwyer 391/393/394系列侧安装式液位控制
重型和低成本是对391系列液面控制的完美描述。不锈钢开关机构使用重力返回作用，而不是弹簧的长寿命。耐候外壳是标准的。焊接钢室在600°F(315°C)下可满足650 psig(45 Bar)的焊接要求。
选型表
| EXAMPLE | 391 | WT | 7810 | C1 | 70 | 391-WT-7810-C1-70 Liquid Level Control with welded carbon steel chamber, watertight – NEMA 4X enclosure, SPDT snap action switch rated 12 amp 120 VAC, 5 amp 240 VAC, fixed deadband and automatic reset, operating pressure 600 psig (41 bar) at 100ºF (38ºC), 500 psi (34 bar) at 600ºF (315ºC), side/bottom process connections 1” NPT, minimum specific gravity 0.70. | |
| CONNECTION | 391 | One Horizontal and One Vertical 1” NPT or Socket Weld | |||||
| 393 | One Vertical and One Horizontal Flanged Connection | ||||||
| 394 | Two Vertical Flanged Connections | ||||||
| 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 | Two stage, mercury switch, see chart A. | ||||||
| 78XX | Single stage, snap switch, see chart B. | ||||||
| 78XX | Two stage, snap switch, see chart B. | ||||||
| 78XXHM | Hermetically sealed snap switch, see chart B. | ||||||
| 98XX | Single stage, high capacity DC snap switch, see chart B. | ||||||
| 98XX | Two stage, high capacity DC snap switch, see chart B. | ||||||
| 10XX | Single stage, high temperature snap switch, see chart B. | ||||||
| 10XX | Two stage, high temperature snap switch, see chart B. | ||||||
| CHAMBER MATERIAL | Refer to chart C below for pressure/temperature ratings | ||||||
| C1 | Carbon steel body | ||||||
| MINIMUM SPECIFIC GRAVITY | 70 | 0.70 specific gravity (391 only) | |||||
| 80 | 0.80 specific gravity (391 only) | ||||||
| 95 | 0.95 specific gravity (391 only) | ||||||
| 170 | 0.70 specific gravity & 150# flange (393, 394 only) | ||||||
| 180 | 0.80 specific gravity & 150# flange (393, 394 only) | ||||||
| 195 | 0.95 specific gravity & 150# flange (393, 394 only) | ||||||
| 370 | 0.70 specific gravity & 300# flange (393, 394 only) | ||||||
| 380 | 0.80 specific gravity & 300# flange (393, 394 only) | ||||||
| 395 | 0.95 specific gravity & 300# flange (393, 394 only) | ||||||
| 670 | 0.70 specific gravity & 600# flange (393, 394 only) | ||||||
| 680 | 0.80 specific gravity & 600# flange (393, 394 only) | ||||||
| 695 | 0.95 specific gravity & 600# flange (393, 394 only) | ||||||
| OPTIONS | H2 | 1” socket weld hub instead of 1” NPT | |||||
| STW | SS tag wired | ||||||
| 01 | Breather only (E-Housing only) | ||||||
| 02 | Drain only (E-Housing only) | ||||||
| 12 | Breather and drain (E-Housing only) | ||||||
| 23720 | Fungus proofing special 23720 |
CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS
| SWITCH TYPE | SWITCH ACTION | ELECTRICAL RATINGS IN AMPS | ORDERING CODE | ||||||||
AC | DC | SINGLE STAGE | TWO STAGE | ||||||||
120V | 240V | 440V | 30V | 125V | 250V | LOWER | UPPER | ||||
| CHART A Mercury Contacts | SP-ST open on level FALL | 10 | 5 | 3† | 10 | 5 | -4821 | -4821 | -21 | UL | |
| SP-ST open on level RISE | 10 | 5 | 3† | 10 | 5 | -4820 | -4820 | -20 | UL | ||
| SP-DT one switch | 4 | 2 | 1† | 4 | 2 | -4810 | -4810 | -10 | UL | ||
| SP-DT two switches E.I.* | 10 | 5 | 3† | 10 | 5 | -4815 | -4815 | -15 | UL | ||
| DP-ST two switches E.I.* open on level FALL | 10 | 5 | 3† | 10 | 5 | -4813 | -4813 | -13 | UL | ||
| DP-ST two switches E.I.* open on level RISE | 10 | 5 | 3† | 10 | 5 | -4814 | -4814 | -14 | UL | ||
| DP-DT two SP-DT switches | 4 | 2 | 1† | 4 | 2 | -4806 | -4806 | -06 | UL | ||
| CHART B snap action contacts | SP-DT one switch | 12 | 5 | 3† | 0.5** | 0.25** | -7810 | -7810 | -10 | UL | |
| DP-DT Two SP-DT switches | 12 | 5 | 3† | 0.5** | 0.25** | -7806 | -7806 | -06 | UL | ||
| SP-DT one hermetically sealed switch | 5 | 5 | 5** | -7810HM | -7810HM | -10HM | |||||
| DP-DT two hermetically sealed SP-DT switches | 5 | 5 | 5** | -7806HM | -7806HM | -06HM | |||||
| DP-DT two SP-DT switches | 10 | 3 | 10‡ | 3‡ | -9806 | -9806 | -06 | ||||
| SP-DT one switch | 10 | 3 | 10‡ | 3‡ | -9810 | -9810 | -10 | ||||
| DP-DT two SP-DT switches | 2 | 2 | 0.4** | 0.25** | -1006 | -1006 | -06 | ||||
| SP-DT one switch | 2 | 2 | 0.4** | 0.25** | -1010 | -1010 | -10 | ||||
†Available on special order, change 1st digit in ordering code from 4 to 5 or 7 to 8, i.e., -4820 becomes -5820, -7810 becomes -8810, etc.
‡10 amp inductive (polarized) at 125 VDC.
*Electrically Independent.
**Resistive.
