Series B-190 Single Stage Top Mount Displacer Type Level Control

Fixed or Adjustable Deadband, For Pumps or Alarms

The Series B-190 Liquid Level Switch-Control is a top mount displacer type level control. 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. This Series is offered in a range of cable lengths, specific gravities, circuit types and enclosure ratings.

Operation: 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. This allows the spring to move the cable and armature upward, actuating the hermetically sealed switches. 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.

Dimensions are based on 316SS displacers with 4" minimum flange type control. All dimensions are approximate and will vary depending on specific gravity, temperature, displacer material and size. Critical dimensions must be verified with the factory before placing order.

Standard Construction: 316SS displacers, 10 foot 316SS cable and stops, 49 125# CI flange: for operation in specific gravities as low as 0.5 and a maximum temperature of 200°F (93°C). For special conditions, other choices include: 316SS displacers: longer cable: monel or hastelloy cable and stops: other flange sizes, materials or pressure ratings, or 3/4" NPT top connection in lieu of flange.

Product Applications

Pumping stations
Foaming liquids
Sanitary/sewage treatment
Paints & varnishes
Agitated or turbulent fluids
Heavy oil refineries
Chemical plants
Power generating stations
Viscous or dirty liquids

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: 316SS. Optional 304 SS, 316 SS, or carbon graphite.
Temperature Limits:: Ambient Temperature: 32 to 200°F (0 to 93°C);Process Temperature: 32 to 200°F (0 to 93°C).
Pressure Limit:: 125 psig (8.6 bar). 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 or two stage.
Electrical Rating:: Snap switch: 12 A @ 120 VAC, 5 A @ 240 VAC, 0.5 A @ 125 VDC resistive, 0.25 A @ 250 VDC resistive; Hermetically sealed snap switch: 5 A @ 120 VAC, 5 A @ 240 VAC, 5 A @ 30 VDC resistive; Mercury switch: 4 A @ 120 VAC/DC, 2 A @ 240 VAC/DC. Higher contact ratings available for the mercury switch.
Electrical Connections:: Screw terminal.
Conduit Connection:: 3/4" female NPT.
Process Connections:: 4" 125 cast iron flange. Other material, size, and rating flanges are available.
Mounting Orientation:: Vertical.
Set Point Adjustment:: Adjustable by moving displacers, see dimension chart for minimum and maximum values.
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:: 10 ft (3 m) standard. Optional up to 100 ft (30.5 m).
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.
: Inconel® is a registered trademark of Huntington Alloys Corporation.

Features

Extremely versatile design
Displacers are suspended on a coil spring and do not float on the surface of liquids and are unaffected by turbulence or pressure
Excellent for applications with viscous or dirty liquids

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series B-190 Catalog Page

SDS

Mercury

Approvals

UL Approval

Drawings

Model Chart

EXAMPLE	A	190	WT	7810	P	A	1.0	1		Series A190-WT-7810-P-A-1.0-2 Top Mounted Single Stage, displacer type liquid level control. Watertight, NEMA-4 enclosure. SPDT snap action switch, fixed deadband 3/4" (19 mm) at 1.0 SG. Max operating temp 200 deg F (93 deg C) with 10' SS cable and 316SS displacers, with 4" 125# cast iron flange.
TYPE	A AA B BB									4" Flange or Larger, Fixed Differential 3" Flange, Fixed Differential 4" Flange or Larger, Adjustable Differential 3" Flange, Adjustable Differential
SERIES		190								Single Stage Top Mount Displacer Type Liquid Level Control
ENCLOSURE			G WT E EV							General Purpose Watertight Explosion-proof Explosion-proof/Vapor-proof
CIRCUITS				48XX 78XX 78XXHM 98XX						See Chart A below See Chart B below See Chart B below See Chart B below
DISPLACERS					S S304 K I					316SS 304SS Karbate (A190, B190 only) Intrf 3-1/2 dia. x 10 (A190, B190 only)
CABLE LENGTH						A B C D E F G				10 ft. 15 ft. 20 ft. 25 ft. 30 ft. 40 ft. 50 ft.
SPECIFIC GRAVITY							0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2			0.4 S.G. (A190, AA190 only) 0.5 S.G. (A190, AA190 only) 0.6 S.G. 0.7 S.G. 0.8 S.G. 0.9 S.G. 1.0 S.G. 1.1 S.G. 1.2 S.G.
FLANGE								00 0 6 7 8 9 10 11 12 13 14 15 6S 7S 8S 9S 10S 11S 12S 13S 14S 15S		3" NPT connection 3/4" Screw connection 3" 150# RF carbon steel 4" 150# RF carbon steel 5" 150# RF carbon steel 6" 150# RF carbon steel 8" 150# RF carbon steel 3" 300# RF carbon steel 4" 300# RF carbon steel 5" 300# RF carbon steel 6" 300# RF carbon steel 8" 300# RF carbon steel 3" 150# RF 316SS 4" 150# RF 316SS 5" 150# RF 316SS 6" 150# RF 316SS 8" 150# RF 316SS 3" 300# RF 316SS 4" 300# RF 316SS 5" 300# RF 316SS 6" 300# RF 316SS 8" 300# RF 316SS
OPTIONS									INC STW 01 02 12 23720	Inconel Spring SS Tag Wired Breather Only (E-Housing only) Drain Only (E-Housing only) Breather and Drain (E-Housing only) Fungus Proofing

CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS

SWITCH TYPE	SWITCH ACTION	ELECTRICAL RATINGS IN AMPS						ORDERING CODE
		AC			DC
		120V	240V	440V	30V	125V	250V
CHART A Mercury Contacts	SPST Open on Level Fall	10	5	3†		10	5	4821
	SPST Open on Level Rise	10	5	3†		10	5	4820
	SPDT One switch	4	2	1†		4	5	4810
	SPDT Two switches E.I.*	10	5	3†		10	5	4815
	DPST Two switches E.I.* Open on Level Fall	10	5	3†		10	5	4813
	DPST Two switches E.I.* Open on Level Rise	10	5	3†		10	5	4814
	DPDT Two SPDT switches	4	2	1†		4	2	4806
CHART B Snap Action Contacts	SPDT One switch	12	5	3†		0.5†	0.25†	7810
	DPDT Two SPDT switches	12	5	3†		0.5†	0.25†	7806
	SPDT One hermetically sealed switch	5	5		5†			7810HM
	DPDT Two hermetically sealed SPDT switches	5	5		5†			7806HM
	DPDT Two SPDT switches	10	3			10‡	3‡	9806
	SPDT One switch	10	3			10‡	3‡	9810

*Electrically Independent; †Resistive; ‡10 amp inductive (polarized) at 125 VDC.

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Model	Description	Availability*	Price