Operating Pressures to 500 psig, 34 bar, Hermetically Sealed Snap Switch Option

Long life and reliable operation is inherent in the design of the 201 series. The heavy duty welded carbon steel chamber provides a control to operate up to 1000 psi (69 bar) and process temperature up to 750°F (400°C), 400°F (205°C) at the electrical head assembly. The use of an external magnet reduces the possibility of magnetic particle build up inside the armature tube and subsequent loss of operation as may occur with the internal magnet repulsion design. Choice of construction provides equipment suitable for specific gravity as low as (0.60). Electrical requirements are met by use of hermetically sealed snap action or mercury switches in a variety of actions including SPST, SPDT, DPDT and DPST arrangements. Optional circuits are available for low current/voltage DC; high current DC; or high temperature applications. Standard process connections are combination 1" NPT and 1" socket weld hubs. Flanged connections are offered as an option.

Product Applications

Refineries
Chemical plants
Power generating stations
Water treatment plants
Mixing systems
Scrubbers
Accumulators
Condensate recovery
Industrial tanks and vessels

More Information

Model Chart

EXAMPLE	201	WT	7810	10	C1	60		201-WT-7810-10-C1-60 Liquid Level Control, welded carbon steel chamber, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, side/bottom process connections, combination 1” NPT/socket weld hubs, minimum specific gravity 0.60, operating pressure 600 psig (41 bar) at 100ºF (38ºC), 500 psi (34 bar) at 750ºF (400ºC).
CONNECTION	201							One Horizontal and One Vertical 1” NPT or Socket Weld
	203							One Vertical and One Horizontal Flanged Connection
	204							Two Vertical Flanged Connections
ENCLOSURE		G						General purpose, NEMA 1
		WT						Weatherproof, NEMA 3R, 4, 4X (Not CSA)
		E						Explosion-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G (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 (CSA approved Groups C, D, E, F, G only)
CIRCUITS (for electrical circuits, See charts A & B below)			48XX					Single stage, mercury switch, see chart A.
			48XX	XX				Two stage, mercury switch, see chart A.
			78XX					Single stage, snap switch, see chart B.
			78XX	XX				Two stage, snap switch, see chart B.
			78XXHM					Hermetically sealed snap switch, see chart B.
			98XX					Single stage, high capacity DC snap switch, see chart B.
			98XX	XX				Two stage, high capacity DC snap switch, see chart B.
			10XX					Single stage, high temperature snap switch, see chart B.
			10XX	XX				Two stage, high temperature snap switch, see chart B.
CHAMBER MATERIAL								Refer to chart C below for pressure/temperature ratings
					C1			Carbon steel body
					C216			316 SST body
					C217			316 SST body with shield
					HFC1			Heat fins carbon steel body
					HFC216			Heat fins 316 SST body
					HFC217			Heat fins 316 SST body with shield
MINIMUM SPECIFIC GRAVITY						60		0.60 specific gravity
						75		0.75 specific gravity
						160		0.60 specific gravity & 150# flange
						175		0.75 specific gravity & 150# flange
						360		0.60 specific gravity & 300# flange
						375		0.75 specific gravity & 300# flange
						660		0.60 specific gravity & 600# flange
						675		0.75 specific gravity & 600# flange
OPTIONS							H1	1 inch vent
							H215	1-1/2 inch socket weld hub
							H220	2 inch socket weld hub
							R	Manual reset for single stage
							R1	Manual reset for lower stage of 2-stage controls
							R2	Manual reset for upper stage of 2-stage controls
							R3	Manual reset for both stages of 2-stage controls
							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 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	125V	250V	SINGLE STAGE	LOWER	UPPER
CHART A Mercury Contacts	SP-ST open on level FALL	10	5	3†	10	5	-4821	-4821	-21	UL	CSA
	SP-ST open on level RISE	10	5	3†	10	5	-4820	-4820	-20	UL	CSA
	SP-DT one switch	4	2	1†	4	2	-4810	-4810	-10	UL	CSA
	SP-DT two switches E.I.*	10	5	3†	10	5	-4815	-4815	-15	UL	CSA
	DP-ST two switches E.I.* open on level FALL	10	5	3†	10	5	-4813	-4813	-13	UL	CSA
	DP-ST two switches E.I.* open on level RISE	10	5	3†	10	5	-4814	-4814	-14	UL	CSA
	DP-DT two SP-DT switches	4	2	1†	4	2	-4806	-4806	-06	UL	CSA
CHART B snap action contacts	SP-DT one switch	12	5	3†	0.5**	0.25**	-7810	-7810	-10	UL	CSA
	DP-DT Two SP-DT switches	12	5	3†	0.5**	0.25**	-7806	-7806	-06	UL	CSA
	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
	DP-DT two SP-DT switches	2	2		0.4**	0.25**	-1006	-1006	-06
	SP-DT one switch	2	2		0.4**	0.25**	-1010	-1010	-10

†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.
***30VDC = 5 resistive.

CHART C - MOUNTING STYLE

SERIES	MOUNTING STYLE	MINIMUM SPECIFIC GRAVITY	PRESSURE RATING @		FLANGE CLASS psi)	ORDER CODE
SERIES	MOUNTING STYLE	MINIMUM SPECIFIC GRAVITY	38°C 100°F	400°C 750°F	FLANGE CLASS psi)	ORDER CODE
201	1" NPT	0.6	600 psi (41 bar)	500 psi (34bar)	--	C1-60
201	1" NPT	0.75	1000 psi (69 bar)	750 psi (52 bar)	--	C1-75
203 204	Flanged	0.6	275 psi (19 bar)	100 psi (7 bar)	150	C1-160
203 204	Flanged	0.75	275 psi (19 bar)	100 psi (7 bar)	150	C1-175
203 204	Flanged	0.6	600 psi (41 bar)	425 psi (29 bar)	300	C1-360
203 204	Flanged	0.75	720 psi (49 bar)	425 ps(29 bar)	300	C1-375
203 204	Flanged	0.6	600 psi (41 bar)	500 psi (34 bar)	600	C1-660
203 204	Flanged	0.75	1000 psi (69 bar)	750 psi (51 bar)	600	C1-675

Specifications

Service: Compatible liquids.
Wetted Materials: Body: carbon steel. Optional 316 SS. Float and Trim: 303 SS, 304 SS, 316 SS, and 430 SS. Options of 316 SS and 430 SS or all 316 SS.
Temperature Limits: Process: 750°F (399°C). Heat fins should be used for process temperatures above 500°F (260°C) with mercury switches, 400°F (204°C) with snap switches, and 350°F (176.7°C) with hermetically sealed snap switches.
Pressure Limit: 600 psig (41 bar) at 100°F (37.7°C), 500 psig (34 bar) at 750°F (399°C). Higher ratings available.
Enclosure Rating: NEMA 4X. Optional general purpose or explosion-proof.
Repeatability: ±1/4" (6.4 mm).
Switch Type: SPDT snap switch, hermetically sealed snap switch or mercury switch. Optional DPDT or two stage.
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 @ 125 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: 1" female NPT and 1" socket weld hub. Optional flange connections.
Mounting Orientation: Vertical.
Set Point Adjustment: ±1" (25.4 mm).
Weight: 201: 33 lb (14.97 kg); 203: 37 lb (17 kg); 204: 44 lb (20 kg).
Agency Approvals: UL and CSA.
Specific Gravity: 0.6 minimum.

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Series 201/203/204 Side Mounted-Chamber Type Level Control

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