Series 1221/1223/1224 Flanged Chamber Level Control

External Mount, Pressure to 1000 psig (69 bar), Temperature to 475°F (246°C), Minimum Specific Gravity 0.40

Low specific gravity and superior long term performance make this Series ideal for applications which require operation at specific gravities as low as 0.40. This Series also provides a heavy duty flanged chamber with removable stainless steel float for easy inspection and maintenance. Chamber is rated for operation of 1000 psig (69 bar) at 100°F (38°C), and 850 psig (59 bar) at 475°F (246°C). 1" NPT process connections are standard. Socket weld hubs or flanged connections are optional. Various circuits are available in SPST, SPDT or DPDT configurations with hermetically sealed snap action or mercury contacts. Enclosures are 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/Wastewater Facilities
Drip Legs
Hydraulic Systems
Boilers

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Models & Ordering

Specifications

Minimum Specific Gravity:: 0.40. Process pressure 1000 psig (69 bar) at 100°F (38°C); 850 psig (59 bar) at 475°F (246°C).
Temperature Limits:: Ambient Temperature: 212°F (100°C); Process Temperature: up to 475°F (246°C).
Switch Type:: Snap action or mercury. See Model Chart.
Electrical Rating:: See Model Chart.
Wiring Connections:: G, WT or E enclosure: terminal block; EV enclosure: 18" (460 mm) leads.
Process Connections:: 1" NPT or flanges. See Model Chart. (1" socket weld hubs optional).
Enclosures:: G: painted steel and aluminum; WT: painted steel, aluminum, neoprene; E: aluminum; EV: aluminum, neoprene.
Wetted Parts:: C1 construction. Chamber, carbon steel. Trim 303SS, 304SS, 316SS and 430SS.
Weight:: 1221: 64 lb (29 kg); 1223: 74 lb (33.6 kg); 1224: 81 lb (36.7 kg).
: Suggested Specifications:
Liquid level control shall be 1221 (1223) (1224) Series with flanged carbon steel chamber and removable float. Process connections shall be 1" NPT (socket weld hubs) (flanged). Control shall be suitable for operation at 1000 psi (69 bar) at 100°F (38°C), and 850 psig (59 bar) at 475°F (246°C) with a minimum specific gravity of 0.40 (C1-40). Circuit shall be (hermetically sealed) snap action (mercury) switch (SPST) (SPDT) (DPDT) with fixed deadband. Switch mechanism shall be gravity return and shall be activated by a stainless steel float. Enclosure shall be general purpose, (weatherproof) (explosion-proof) (explosion-proof – vapor proof).

Model Chart

EXAMPLE	1221	WT	7810	C1	40		1221-WT-7810-C1-40 Liquid Level Control, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 1000 psig (69 bar) at 100°F (38°C), 850 psig (59 bar) at 475°F (246°C), side/bottom process connections, 1" NPT, minimum specific gravity 0.40.
CONNECTION	1221						One Vertical and One Horizontal 1" NPT
	1223						One Vertical and One Horizontal Flanged Connection
	1224						Two Vertical Flanged Connections
	1224T
ENCLOSURE		G					General Purpose, NEMA 1
		WT					Weatherproof, NEMA 3R, 4, 4X
		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, use heat fins (HF) if process temperature exceeds 350°F (177°C), do not exceed 450°F (232°C), see chart B
			98XX-XX				Two 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
CHAMBER MATERIAL				C1			Carbon Steel Body
				C216			316SS Body
				HFC1			Heat Fins & Carbon Steel Body
MINIMUM SPECIFIC GRAVITY					40		0.40 Specific Gravity (1221 only)
					140		0.40 Specific Gravity & 150# Flange (1223, 1224 only)
					340		0.40 Specific Gravity & 300# Flange (1223, 1224 only)
					640		0.40 Specific Gravity & 600# Flange (1223, 1224 only)
OPTIONS						H2	H2 Socket Weld Hub (1221, steel housing only)
						STW	SS Tag Wired
						01	Breather Only (E-Housing only)
						02	Drain Only (E-Housing only)
						12	Breather & Drain (E-Housing only)
						23720	Fungus Proofing

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	-21
	SP-ST open on level RISE	10	5	3†		10	5	-4821	-4821	-20
	SP-DT one switch	4	2	1†		4	2	-4810	-4810	-10
	SP-DT two switches E.I.*	10	5	3†		10	5	-4815	-4815	-15
	DP-ST two switches E.I.* open on level FALL	10	5	3†		10	5	-4814	-4814	-13
	DP-ST two switches E.I.* open on level RISE	10	5	3†		10	5	-4813	-4813	-14
	DP-DT two SP-DT switches	4	2	1†		4	2	-4806	-4806	-06
CHART B snap action contacts	SP-DT one switch	12	5	3†		0.5**	0.25**	-7810	-7810	-10
	DP-DT two SP-DT switches	12	5	3†		0.5**	0.25**	-7806	-7806	-06
	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

†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.