Adjustable Deadband, Weatherproof Enclosure

Adjustable deadband combined with direct 2-1/2" threaded or 2-1/2" flange mount makes the reliable, heavy duty 500 Series ideal for liquid level control in large or small tanks. Chambers are available in cast iron, cast steel or cast 316 stainless steel to meet the most demanding application. Float rods are available from the standard 6" (152.4 mm) up to 24" (610 mm) long providing action down to a specific gravity of 0.55. 2-1/2" (64 mm) float is suitable for pressure of 400 psig (28 bar), 2-1/2" x 4" (64 x 102 mm) float is suitable for 200 psig (14 bar). Maximum operating temperature is 425°F (218°C). A variety of circuits can be ordered including SPST, SPDT or DPDT with hermetically sealed snap action or mercury contacts. Single pole, double throw electrically independent circuits are available as well as contact for high or low DC current applications. A full range of enclosures are available such as general purpose, weatherproof, explosion-proof or explosion-proof/vapor proof.

Product Applications

Oil refineries
Chemical plants
Power generating stations
Pumping stations
Heat transfer systems
Sanitary/waste water facilities
Drip legs
Hydraulic systems
Boilers

More Information

Model Chart

EXAMPLE	500T	WT	7810		C	55	6	0		500T-WT-7810-C-55-6-0 Liquid Level Control, NEMA 4X weatherproof enclosure, 2-1/2” NPT cast steel threaded chamber for direct tank mounting, SPDT snap action switch, fixed deadband, automatic reset, operating pressure 200psi (14 bar) to 425°F (218°C), minimum specific gravity 0.55 with 6” (152mm) float rod and 2-1/2” x 4” (64mm x 102mm) float.
CONSTRUCTION	500T									NPT threaded process connection
CONSTRUCTION	500F									Flanged direct mount process connection
ENCLOSURE		G								General purpose, NEMA 1
		WT								Watertight NEMA 4, 4X
		E								Explosion-proof, NEMA 7, 9
		EV								Explosion-proof, vapor-proof, NEMA 7, 9
CIRCUITS (for electrical circuits, See charts A & B below)			XXXX	XX						Snap action or mercury switch, see chart A and B below.
			78XXHM							Hermetically sealed snap switch, see chart B below or consult factory.
CHAMBER MATERIAL					C					Cast iron
					C216					Cast 316SS
					C217					Cast 316SS with shielded armature
MINIMUM SPECIFIC GRAVITY						80				0.80 specific gravity, 2-1/2” diameter round float
						70				0.70 specific gravity, 2-1/2” x 4” float (2 stage only)
						55				0.55 specific gravity, 2-1/2” x 4” float
ROD LENGTH							6			6” 316SS (Standard)
							12			12” 316SS
							18			18” 316SS
							24			24” 316SS
FLANGE								0		No flange
								2		2-1/2” 125# cast iron
								3		3” 125# cast iron
								4		4” 125# cast iron
								5		6” 125# cast iron
								6		2-1/2” 150# forged steel
								7		3” 150# forged steel
								8		4” 150# forged steel
								9		6” 150# forged steel
								10		2-1/2” 300# forged steel
								11		3” 300# forged steel
								6S		2-1/2” 150# 316SS
								7S		3” 150# 316SS
								8S		4” 150# 316SS
OPTIONS									HF	Heat fins
									R	Manual reset for single stage
									R1	Manual reset for lower stage of 2-stage controls
									STW	Stainless steel tag wired
									01	Breather only (E-Housing only)
									02	Drain only (E-Housing only)
									12	Breather and drain (E-Housing only)
									23720	Fungus proofing special 23720

CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS

SWITCH TYPE	SWITCH ACTION	ELECTRICAL RATINGS IN AMPS						ORDERING CODE
		AC			DC			SINGLE STAGE	TWO STAGE
		120V	240V	440V	30V	125V	250V	SINGLE STAGE	LOWER	UPPER
CHART A Mercury Contacts	SP-ST open on level FALL	10	5	3†		10	5	-4820	-4820	-20	UL
	SP-ST open on level RISE	10	5	3†		10	5	-4821	-4821	-21	UL
	SP-DT one switch	4	2	1†		4	2	-4810	-4810	-10	UL
	SP-DT two switches E.I.*	10	5	3†		10	5	-4815	-4815	-15	UL
	DP-ST two switches E.I.* open on level FALL	10	5	3†		10	5	-4814	-4814	-14	UL
	DP-ST two switches E.I.* open on level RISE	10	5	3†		10	5	-4813	-4813	-4813	UL
	DP-DT two SP-DT switches	4	2	1†		4	2	-4806	-4806	-06	UL
CHART B snap action contacts	SP-DT one switch	12	5	3†		0.5**	0.25**	-7810	-7810	-10	UL
	DP-DT Two SP-DT switches	12	5	3†		0.5**	0.25**	-7806	-7806	-06	UL
	SP-DT one hermetically sealed switch	5	5		5**			-7810HM	-7810HM	-10HM
	DP-DT two hermetically sealed SP-DT switches	5	5		5**			-7806HM	-7806HM	-06HM
	DP-DT two SP-DT switches	10	3			10‡	3‡	-9806	-9806	-06
	SP-DT one switch	10	3			10‡	3‡	-9810	-9810	-10

Specifications

Minimum Specific Gravity:Dependent on float size and rod length. See model chart.
Switch Type:Snap action or mercury. See circuit charts A and B on catalog page.
Electrical Rating:See charts A and B on catalog page.
Wiring Connection:G, WT or E enclosure, terminal board. EV enclosure 18" (460 mm) leads.
Process Connections:T type 2-1/2" NPT. F type 2-1/2" flange standard.
Enclosures:G, painted steel and aluminum. WT, painted steel, aluminum and neoprene. E, aluminum. EV, aluminum and neoprene.
Wetted Parts:See model chart on catalog page.
Weight:500 T, 10 lb (4.5 kg); 500 F, 14 lb (6.4 kg).

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Series 500 Insertion Type Level Control

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