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

Ordering

Grouped product items
Model	Description	Availability*	Qty	Price

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.

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series 391/393/394 Catalog Page

SDS

Mercury

Approvals

Drawings

Model Chart

SERIES 391, 393, 394 LIQUID LEVEL CONTROL       
     
     391-X-X-X-X-OPT MERCOID 391 LIQUID LEVEL CONTROL
     393-X-X-X-X-OPT MERCOID 393 LIQUID LEVEL CONTROL
     394-X-X-X-X-OPT MERCOID 394 LIQUID LEVEL CONTROL

	1ST SYMBOL (1ST X) ENCLOSURE
	   G       GENERAL PURPOSE NEMA 1
	   WT      WATERTIGHT NEMA-4, 4X
	   E       EP CL I GRP B,C,D CL II GRP E,F,G NEMA-7, 9
	   EV      EP VP CL I GRP B,C,D CL II GRP E,F,G NEMA-7, 9
   
	2ND SYMBOL (2ND X) CIRCUITS
	   4806    5806  7806HM
	   4810          7810HM
	   4813          7806GLD
	   4814    
	   4815      
	   4820      
	   4821      
	   7804    
	   7806    
	   7807    
	   7810    
	   9804    
	   9806    
	   9810    
	   1010    
	   1006    
	   4912    
	   4951    
	          
	          
   
	3RD SYMBOL (3RD X) CHAMBER MATERIAL
	   C1      CARBON STEEL BODY
   
	4TH SYMBOL (4TH X) 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 (OPT)
	   -H2      H2 SOCKET WELD HUB           (391, STEEL HOUSING ONLY)
           -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 SPEC 23720


 1. CIRCUITS SK-547PC, SK-548PSS OBSOLETE 8-1-2013
 2. CIRCUITS 4806AV 4810AV 4813AV 4814AV 4815AV 4820AV 4821AV
    7706AV 7710AV 4808VAV 4809VAV 4826VAV 4828VAV 4838VAV
    4896VAV OBSOLETE 8-22-2014

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Accessories

Model	Description	Availability*	Price