Series 301 Top Mount Float Type Level Control

Single Stage for Alarms, Depth to 12 ft.

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The reliable 301 Series has proven to be a rugged economical choice for top mounting on tanks where side mounting is not practical, or for use in sumps. These units feature a fixed deadband for high or low alarm or shutdown. This control can be mounted on top of any closed or open tank or sump by use of the 3/4" NPT connection. Flanges are also available in various sizes, pressure rating and material to meet any installation. Several size floats are available to accommodate liquids to a specific gravity of 0.5 and depths to 12 feet.

Electrical switch actions, SPST, SPDT, DPDT, or DPST, can be ordered to satisfy most applications. Two-stage operation available, consult factory. Hermetically sealed snap action or mercury contacts provide for high or low current or voltage requirements. Enclosures include general purpose NEMA 1, weatherproof NEMA 4, explosion-proof NEMA 7, 9. The explosion-proof, vapor proof version combines weatherproof, vapor proof, and explosion-proof NEMA 4, 7, 9 construction in one enclosure. The 301 Series can be used on pressurized vessels.

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

Minimum Specific Gravity:: Dependent on float size and rod length. See Dimensional Drawing.
Temperature Limits:: Ambient Temperature: 212°F (100°C); Process Temperature: up to 500°F (260°C). See model chart.
Switch Type:: Snap action or mercury. See Electrical Circuits and Ratings on model chart page.
Electrical Rating:: See Electrical Circuits and Ratings on Model Chart page.
Wiring Connection:: G, WT or E enclosure, terminal board. EV enclosure 18" (460 mm) leads.
Enclosures:: G: painted steel and aluminum; WT: painted steel, aluminum and neoprene; E: aluminum; EV: aluminum and neoprene.
Wetted Parts:: See Model Chart.
Approximate Weight:: 301G, WT with 4-1/2" SS float, 8 ft. rod, 5" 125# cast iron flange: approximately 35 lb (16 kg) with E, EV enclosure: 39 lb (17.7 kg).
: Suggested Specification:
Liquid level control shall be top mount, float operated with fixed deadband for alarm service, (insertion depth, float and flange type to be specified). Circuit shall be hermetically sealed (SPST) (SPDT) DPDT snap action (mercury) switch. Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosion-proof - vapor proof).

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series 301 Catalog Page

SDS

Mercury

Approvals

Drawings

Model Chart

EXAMPLE	301	G	4810	AS	15	1.0	2	STW	301-G-4810-AS-15-1.0-2-STW Top mount Float Type Level Control, NEMA 1 enclosure, single stage mercury switch, 3-1/2" x 6" 304SS float, 316SS stops, 304SS extension, 1.0 specific gravity, 4" 125# cast iron flange, with SS tag.
SERIES	301								Top Mount Float Type Level Control
ENCLOSURE		G							General Purpose, NEMA 1
		WT							Weather tight, NEMA 1, 2, 3, 4, 4X
		E							Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G, Div. I & II; CSA approved Groups C, D, E, F, G only
		EV							Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G, Div. I & II; CSA approved Groups C, D, E, F, G only
CIRCUITS			48XX						Single Stage Mercury Switch, see chart A
			78XX						Single Stage, Snap Switch, see chart A
			78XXHM						Hermetically Sealed Snap Switch, see chart B
			98XX						Single Stage, High Capacity DC Snap Switch, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B
FLOAT/ STOP/ GUIDE ROD				00					No Float, No Guide Rod
				AS					3-1/2" x 6" 304SS Float, 316SS Stops, 304SS Extension
				BS					4-1/2" Copper Float, 316SS Stops, 304SS Extension
				CS					4-1/2" 304SS Float, 316SS Stops, 304SS Extension
				DS					7" 304SS Float, 316SS Stops, 304SS Extension
				ES					7" Copper Float, 316SS Stops, 304SS Extension
				A0					3-1/2" x 6" 304SS Float, 316SS Stops, No Extension
				B0					4-1/2" Copper Float, 316SS Stops, No Extension
				C0					4-1/2" 304SS Float, 316SS Stops, No Extension
				D0					7" 304SS Float, 316SS Stops, No Extension
				E0					7" Copper Float, 316SS Stops, No Extension
OPERATING POINT					XX				≥12 or ≤96. See Dimensional Drawing.
SPECIFIC GRAVITY						1.0			1.0 Specific Gravity
						.9			0.9 Specific Gravity
						.82			0.82 Specific Gravity
						.75			0.75 Specific Gravity
						.62			0.62 Specific Gravity
						.50			0.50 Specific Gravity
FLANGE							0		No Flange
							7		4" 150# RF Carbon Steel
							8		5" 150# RF Carbon Steel
							9		6" 150# RF Carbon Steel
							10		8" 150# 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
							7S		4" 150# RF 316SS
							8S		5" 150# RF 316SS
							9S		6" 150# RF 316SS
							10S		8" 150# RF 316SS
							12S		4" 300# RF 316SS
							13S		5" 300# RF 316SS
							14S		6" 300# RF 316SS
							15S		8" 300# RF 316SS
OPTIONS								HF	Heat Fins
								STW	SS Tag Wired
								01	Breather Only (E-Housing only)
								02	Drain Only (E-Housing only)
								12	Breather and Drain (E-Housing only)
								14210.40	Spec. 14210 for Sch 40
								14210.80	Spec. 14210 for Sch 80
								23720	Fungus Proofing

*Not supplied if insertion depth is less that 15".

CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS

SWITCH TYPE	SWITCH ACTION	ELECTRICAL RATINGS IN AMPS						ORDERING CODE
		AC			DC			SINGLE STAGE
		120V	240V	440V	30V	125V	250V	SINGLE STAGE
CHART A Mercury Contacts	SP-ST open on level FALL	10	5	3†		10	5	-4821
	SP-ST open on level RISE	10	5	3†		10	5	-4820
	SP-DT one switch	4	2	1†		4	2	-4810
	SP-DT two switches E.I.*	10	5	3†		10	5	-4815
	DP-ST two switches E.I.* open on level FALL	10	5	3†		10	5	-4813
	DP-ST two switches E.I.* open on level RISE	10	5	3†		10	5	-4814
	DP-DT two SP-DT switches	4	2	1†		4	2	-4806
CHART B snap action contacts	SP-DT one switch	12	5	3†		0.5**	0.25**	-7810
	DP-DT two SP-DT switches	12	5	3†		0.5**	0.25**	-7806
	SP-DT one hermetically sealed switch	5	5		5**			-7810HM
	DP-DT two hermetically sealed SP-DT switches	5	5		5**			-7806HM
	DP-DT two SP-DT switches	10	3			10‡	3‡	-9806
	SP-DT one switch	10	3			10‡	3‡	-9810

†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.

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Model	Description	Availability*	Price