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Chinese
Series 391/393/394 Side Mounted-Chamber Type Level Control
Compact, Low Cost, Hermetically Sealed Snap Switch Option
Heavy duty and low cost is the perfect description for the Series 391 Level Control level control. Stainless steel switching mechanism uses gravity return action instead of springs for long life. Weatherproof enclosure is standard. Welded steel chamber is good for 650 psig (45 bar) at 600°F (315°C).
Product Applications
- Refineries
- Chemical plants
- Power generating stations
- Water treatment plants
- Mixing systems
- Scrubbers
- Accumulators
- Condensate recovery
- Industrial tanks and vessels
Models & Ordering
Specifications
- Service:
- Compatible liquids.
- Wetted Materials:
- Body: carbon steel; Float and Trim: 303 SS, 304 SS, 316 SS, and 430 SS.
- Temperature Limits:
- Ambient Temperature: 212°F (100°C); Process Temperature: up to 600°F (315.6°C)*.
*Heat fins and/or high temperature switches must be used for process temperatures above 500°F (260°C) with mercury switches, 400°F (204°C) with snap switches, and 350°F (176.7°C) with hermetically sealed snap switches. - Pressure Limits:
- 800 psig (55 bar) at 100°F (37.7°C), 650 psig (45 bar) at 600°F (315.6°C). Higher ratings available.
- Enclosure Rating:
- NEMA 4X. Optional general purpose or explosion-proof.
- Switch Type:
- SPDT snap switch, hermetically sealed snap switch or mercury switch. Optional DPDT.
- Electrical Rating:
- Snap Switch: 12A @ 120 VAC, 5A @ 240 VAC, 0.5A @ 125 VDC resistive, 0.25A @ 250 VDC resistive. Hermetically Sealed Snap Switch: 5A @ 125 VAC, 5A @ 240 VAC, 5A @ 30 VDC resistive. Mercury Switch: 4A @ 120 VAC/DC, 2A @ 240 VAC/DC. Higher contact ratings available for the mercury switch.
- Electrical Connections:
- Screw terminal.
- Conduit Connection:
- 3/4" female NPT.
- Connections:
- 1" female NPT. Optional 1" socket weld hub or flange connections.
- Mounting Orientation:
- Vertical.
- Weight:
- 10 lb (4.5 kg).
- Agency Approvals:
- UL, none on HM switch.
- Specific Gravity:
- 0.8 minimum. Optional 0.7 minimum.
Model Chart
| 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 |
| 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.
Approvals
Drawings
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