External Mount, Pressure to 1750 psig (121 bar), and Temperature to 500°F (260°C)

High pressure capability in a heavy duty welded carbon steel chamber provides a rugged heavy duty control to operate up to 1750 psi (121 bar) at 100°F (38°C), and 1650 psi (114 bar) at 500°F (260°C) with a minimum specific gravity of 0.60. Electrical enclosures are suited for general purpose NEMA 1, weatherproof NEMA 4X, explosion-proof or explosion-proof – vapor proof NEMA 7, 9 groups B, C, D, E, F, G, Division I and II requirements. 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, low DC voltage, high DC current, or high temperature applications. Check the model chart for the switch best suited for your application.

Product Applications

Oil Refineries
Chemical Plants
Power Generating Stations
Pumping Stations
Heat Transfer Systems
Sanitary/Wastewater Facilities
Drip Legs
Hydraulic Systems
Boilers

More Information

Model Chart

EXAMPLE	1261	WT	7810	C1	60		1261-WT-7810-C1-60 Liquid Level Control, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 1750 psig (121 bar) at 100°F (38°C), 1650 psig (114 bar) at 500°F (260°C), side/bottom process connections, 1" NPT, minimum specific gravity 0.60.
CONNECTION	1261						One Vertical and One Horizontal 1" NPT
	1263						One Vertical and One Horizontal Flanged Connection
	1264						Two Vertical Flanged Connections
	1264T
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
CHAMBER MATERIAL				C216			316SS Body
MINIMUM SPECIFIC GRAVITY					60		0.60 Specific Gravity (1261 only)
MINIMUM SPECIFIC GRAVITY					660		0.60 Specific Gravity & 600# Flange (1263, 1264 only)
OPTIONS						H1	1" NPT Vent (1261, steel housing only)
						R	Manual Reset, Single Stage
						R1	Manual Reset, Lower Stage 2-Stage Control
						R2	Manual Reset, Upper Stage 2-Stage Control
						R3	Manual Reset, Both Stages 2-Stage Control
						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.

Specifications

C1-60: Minimum specific gravity 0.60. Process pressure 1750 psig (121 bar) at 100°F (38°C), 1650 psig (114 bar) at 500°F (260°C).
Switch Type: Snap switch or mercury. See Model Chart.
Electrical Rating: Electrical Rating: See Model Chart.
Wiring Connections: G, WT or E enclosure: terminal block; EV enclosure: 18" (460 mm) leads.
Process Connections: Combination 1" NPT/socket weld hubs or flanges. See Model Chart.
Enclosures: G: painted steel and aluminum; WT: painted steel, aluminum and neoprene; E: aluminum; EV: aluminum, neoprene.
Wetted Parts: C1 construction is carbon steel, 303SS, 304SS and 430SS.
Weight: 1261: 79 lb (36 kg); 1263: 89 lb (40 kg); 1264: 92 lb (42 kg).

Series 1261/1263/1264 Welded Chamber Level Control

Quality Service Reliability