Series 190/195 Two Stage Top Mount Displacer Type Level Control

Fixed or Adjustable Deadband, For Pumps or Alarms

One of our most versatile level controls, the Series 190 can be used on all types of tank or sump level control applications.

Mercoid® Displacer Controls use displacers that do not float on the surface of liquids, but are suspended on a coil spring. They work on the principle that submerged solids weigh less in liquids, and as the liquid level rises and their weight decreases, the tension on the spring by which they are suspended is decreased. Because they work on a different principle than float type liquid level controls, displacers are not affected by turbulence or pressure, and are excellent for applications with viscous or dirty liquids.

Product Applications

Oil refineries
Chemical plants
Power generating stations
Pumping stations
Sanitary/waste water facilities
Sumps
Open or closed tanks and vessels

Ordering

Grouped product items
Model	Description	Availability*	Qty	Price

Specifications

Service:: Compatible liquids.
Wetted Materials:: Cable, Spring and Stops: 316 SS. Optional Inconel® spring. Displacers: porcelain. Optional 304 SS, 316 SS, or carbon graphite.
Temperature Limits:: 32 to 200°F (0 to 93.3°C). Higher ratings available.
Pressure Limit:: 125 psig (8.6 bar). Higher ratings available.
Enclosure Rating:: General purpose, watertight, explosion-proof or explosion-proof/vapor-proof.
Switch Type:: Snap switch, hermetically sealed snap switch or mercury switch.
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 @ 120 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.
Process Connections:: NPT or flange.
Mounting Orientation:: Vertical.
Set Point Adjustment:: Adjustable by moving displacers, see dimension chart for minimum and maximum values.
Weight:: General purpose or watertight enclosure with 4" 125# cast iron flange approximately 28 lb (12.7 kg); Explosion-proof or explosion-proof/vapor-proof approximately 32 lb (14.5 kg).
Agency Approvals:: UL, none on HM switch.
Specific Gravity:: Standard is 1.0. Specify when ordering by replacing 1.0 in model number with specific gravity setting desired. Settable range is 0.5 to 1.2.
Cable Length:: Up to 50 ft.

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series 190/195 Catalog Page

SDS

Mercury

Approvals

UL Approval

Drawings

Model Chart

195-X-X-X-X-X-X-X-OPT    MERCOID SERIES 195 LIQUID LEVEL CONTROL
                        A195-X-X-X-X-X-X-X-OPT   MERCOID SERIES 195 LIQUID LEVEL CONTROL

     1ST SYMBOL (1ST X) OPERATION
        4       OPERATION 4
        6       OPERATION 6
        7       OPERATION 7
        8       OPERATION 8
    
     2ND SYMBOL (2ND 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
    
     3RD SYMBOL (3RD X) CIRCUITS
        4806-06
        4806-10
        4810-10
        4813-13
        4813-14
        4814-13
        4814-14
        4815-15
        4820-20
        4821-21
        4820-21
        4821-20
        7806-06   7806HM-06HM
        7810-06
        7810-10   7810HM-10HM 
        9806-06
        9810-10
   
     4TH SYMBOL (4TH X) DISPLACER TYPE
        P       PORCELAIN              (ONLY WITH A195)
        S       316SS
        S304    304SS
        K       KARBATE                  (OBS ECR37750)
        I       INTRF DISPLACER 3-1/2 DIA X 10
	   
     5TH SYMBOL (5TH X) CABLE LENGTH
        A       10 FT
        B       15 FT
        C       20 FT
        D       25 FT
        E       30 FT
        F       40 FT
        G       50 FT
    
     6TH SYMBOL (6TH X) SPECIFIC GRAVITY
        ?.?     CUSTOMER SPECIFIED SPECIFIC GRAVITY
      
     7TH SYMBOL (7TH X) FLANGE
        00      3" NPT CONNECTION NO FLANGE
        0       3/4" SCREW CONNECTION NO FLANGE
        6       3" 150# RF CARBON STEEL
        7       4" 150# RF CARBON STEEL
        8       5" 150# RF CARBON STEEL
        9       6" 150# RF CARBON STEEL
       10       8" 150# RF CARBON STEEL
       11       3" 300# 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
        6S      3" 150# RF 316 STAINLESS STEEL
        7S      4" 150# RF 316 STAINLESS STEEL
        8S      5" 150# RF 316 STAINLESS STEEL
        9S      6" 150# RF 316 STAINLESS STEEL
       10S      8" 150# RF 316 STAINLESS STEEL
       11S      3" 300# RF 316 STAINLESS STEEL
       12S      4" 300# RF 316 STAINLESS STEEL
       13S      5" 300# RF 316 STAINLESS STEEL
       14S      6" 300# RF 316 STAINLESS STEEL
       15S      8" 300# RF 316 STAINLESS STEEL
    
     OPTIONS (OPT)
        -INC     INCONEL SPRING               (316SST IS STD) 
        -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

     NOTES
     1. CAST IRON FLANGES OBSOLETED 1-1-2018 PER ECR-041970
        1       3" 125# CAST IRON  (AA190, BB190, A195 ONLY)
        2       4" 125# CAST IRON
        3       5" 125# CAST IRON
        4       6" 125# CAST IRON
        5       8" 125# CAST IRON
       16       3" 250# RF CAST IRON
       17       4" 250# RF CAST IRON
       18       5" 250# RF CAST IRON
       19       6" 250# RF CAST IRON
       20       8" 250# RF CAST IRON
     2. THE FOLLOWING OPTION WAS OBSOLETED PER ECR-046187
        -R1      MANUAL RESET LOWER STAGE

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Accessories

Model	Description	Availability*	Price