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.

More Information

Model Chart

EXAMPLE	195	4	G	4810-10	P	A	1.0	0	INC	Series 195-4-G-4810-10-P-A-1.0-0-INC Level Control, SPDT, porcelain displacers, 10 ft. cable, 1.0 specific gravity, 3/4" screw connection, with Inconel spring.
SERIES	195 A195									Two Stage Top Mount Displacer Control, 2-1/2” diameter displacers Two Stage Top Mount Displacer Control, 2” diameter displacers
CONSTRUCTION		4 6 7 8								Stage Operation 4 Stage Operation 6 Stage Operation 7 Stage Operation 8
ENCLOSURES			G WT E EV							General Purpose Watertight Explosion-proof Explosion-proof & Vapor-proof
CIRCUITS (Three Stage)				48XX-XX 78XX-XX 78XXHM-XX 98XX-XX						See Chart A below See Chart B below See Chart B below See Chart B below
DISPLACERS					P S S304 K I					Porcelain (not suitable for non-vented steam systems) 316SS 304SS Karbate Intrf 3-1/2" dia. x 10"
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							1.0			Customer specified.
FLANGE								00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 6S 7S 8S 9S 10S 11S 12S 13S 14S 15S		3" NPT connection 3/4" Screw connection 3" 125# cast iron (A195 only) 4" 125# cast iron 5" 125# cast iron 6" 125# cast iron 8" 125# cast iron 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" 250# RF cast iron 4" 250# RF cast iron 5" 250# RF cast iron 6" 250# RF cast iron 8" 250# RF cast iron 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 R1 STW 01 02 12 23720	Inconel Spring Manual Reset Lower Stage 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			ORDERING CODE
		120V	240V	440V	30V	125V	250V	LOWER	UPPER
CHART A Mercury Contacts	SPST Open on Level Fall	10	5	3†		10	5	4821	-21
	SPST Open on Level Rise	10	5	3†		10	5	4820	-20
	SPDT One switch	4	2	1†		4	5	4810	-10
	SPDT Two switches E.I.*	10	5	3†		10	5	4815	-15
	DPST Two switches E.I.* Open on Level Fall	10	5	3†		10	5	4813	-13
	DPST Two switches E.I.* Open on Level Rise	10	5	3†		10	5	4814	-14
	DPDT Two SPDT switches	4	2	1†		4	2	4806	-06
CHART B Snap Action Contacts	SPDT One switch	12	5	3†		0.5†	0.25†	7810	-10
	DPDT Two SPDT switches	12	5	3†		0.5†	0.25†	7806	-06
	SPDT One hermetically sealed switch	5	5		5†			7810HM	-10HM
	DPDT Two hermetically sealed SPDT switches	5	5		5†			7806HM	-06HM
	DPDT Two SPDT switches	10	3			10‡	3‡	9806	-06
	SPDT One switch	10	3			10‡	3‡	9810	-10

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.

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195
Mercury

Series 195 Two Stage Top Mount Displacer Type Level Control

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