Mercoid 浮筒液位开关 205系列 使用寿命长，运行可靠是205系列的固有特点。 重型焊接碳钢室提供了一个操作高达1250 psi (86 bar)和工艺温度高达650°F(343°C)、400°F(205°C)的电气头总成控制。 外部磁铁的使用减少了磁粒子在电枢管内积聚的可能性，以及随后的操作损失，因为可能会发生与内部磁铁斥力设计。 结构的选择提供了适用于低比重(0.75)的设备。 电气要求是通过使用密封的快速动作或水银开关在各种行动，包括SPST, SPDT, DPDT和DPST安排。 可选电路可用于低电流/电压直流; 大电流直流; 或高温应用。 检查当前图表中最适合您的应用的开关。 标准工艺连接是组合1“NPT和1”承插焊接轮毂。 可选择法兰连接
C1-75:Minimum specific gravity 0.75. Process pressure 1250 psig (86 bar) @ 100°F (38°C), 650°F (343°C).*
Temperature Limit:Ambient Temperature: 212° F (100°C); Process Temperature: up to 650°F (343°C).
*Heat fins (HF) and/or high temperature switches should be considered for process temperatures above 500°F (260°C).
Switch Type:Snap action or mercury. See charts A and B.
Electrical Rating:See charts A and B.
Wiring Connections:G, WT or E enclosure, terminal block. EV enclosure 18" (460 mm) leads.
Process Connections:Combination 1" NPT/socket weld hubs or flanges. See chart C.
Enclosures:G, painted steel and aluminum; WT, painted steel, aluminum and neoprene; E, aluminum; EV, aluminum and neoprene.
Weight:205, 40 lb (18 kg); 207, 50 lb (22.7 kg); 208, 57 lb (25.8 kg).
Agency Approval:UL.
Suggested Specifications
Liquid level control shall be 205 (207) (208) Series with combination 1" NPT/socket weld hubs (flanged) process connections. Chamber shall be welded suitable for operation at 1250 psig (86 bar) at 100°F (38°C), 650°F (343°C) at a minimum specific gravity of 0.75. Circuits shall be (hermetically sealed) snap action (mercury) switch (SPST) (SPDT), (DPDT). Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosion-proof - vapor-proof). Switch mechanism shall be gravity return and shall be activated by a stainless steel float.
Model Chart
| EXAMPLE |
205 |
WT |
7810 |
10 |
C1 |
75 |
|
205-WT-7810-10-C1-75 Liquid Level Control, welded carbon steel chamber, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, side/bottom process connections, combination 1” NPT/socket weld hubs, minimum specific gravity 0.75, operating pressure 1250 psig (86 bar) at 650ºF (343ºC). |
| CONNECTION |
205 |
|
|
|
|
|
|
Liquid level control |
| ENCLOSURE |
|
G |
|
|
|
|
|
General purpose, NEMA 1 |
| |
WT |
|
|
|
|
|
Weatherproof, NEMA 3R, 4, 4X (Not CSA) |
| |
E |
|
|
|
|
|
Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G (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 (CSA approved Groups C, D, E, F, G only) |
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, see chart B. |
| |
|
98XX |
XX |
|
|
|
Two stage, high capacity DC snap switch, see chart B. |
| |
|
10XX |
|
|
|
|
Single stage, high temperature snap switch, see chart B. |
| |
|
10XX |
XX |
|
|
|
Two stage, high temperature snap switch, see chart B. |
CHAMBER
MATERIAL |
|
|
|
|
|
|
|
Refer to chart C below for pressure/temperature ratings |
| |
|
|
|
C1 |
|
|
Carbon steel body |
| |
|
|
|
HFC1 |
|
|
Heat fins carbon steel body |
MINIMUM SPECIFIC
GRAVITY |
|
|
|
|
|
75 |
|
0.75 specific gravity |
| OPTIONS |
|
|
|
|
|
|
R |
Manual reset for single stage |
| |
|
|
|
|
|
R1 |
Manual reset for lower stage of 2-stage controls |
| |
|
|
|
|
|
R2 |
Manual reset for upper stage of 2-stage controls |
| |
|
|
|
|
|
R3 |
Manual reset for both stages of 2-stage controls |
| |
|
|
|
|
|
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 | |
