Skip to the beginning of the images gallery

Series 102/1102 Flanged Chamber Type Level Control

Series F6 & F7 Level Switches – Vertical

Series 123/125 Boiler Water Level Control

Heavy Duty, Cast Iron Chamber

Be the first to review this product

The Series 123 & 125 Boiler Water Level Controls are designed for boiler applications, the 123 is primarily used for low water cut-off or feed-water control. Other applications include condensate tanks and deaerators. A special snap action switch mechanism eliminates frequent operation due to surging water level. A transparent cover provides convenient visible operation of the switch. Features a flanged chamber for easy clean out and replacement of float or switch mechanism without removing the unit from piping. The 125 offers the same long lasting service with a direct action mercury switch movement that provides a close deadband where needed.

Product Applications

Boiler Low Water Cut-Off
Boiler Feed-Water Control
Condensate Tanks
Deaerators

Starting at $639.60

Ordering

Grouped product items
Model	Description	Availability*	Price
123-153	Water level control, cast iron chamber, SPDT mercury switch.	1-3 days*	$639.60
123-7000-153	Water level control, cast iron chamber, SPDT snap switch.	1-3 days*	$639.60
123-804	Water level control, cast iron chamber, DPDT (2 SPDT) mercury switches.	1-2 Weeks*	$920.40

Specifications

Service:: Compatible liquids. Cast iron is not for use with lethal or flammable substances either liquid or gaseous.
Wetted Materials:: Body: Cast iron. Float: 304 SS. Trim and packing gland: Brass. Packing: Carbon. Body gasket: Carbon.
Temperature Limit:: Ambient Temperature: 212°F (100°C);Process Temperature: 365°F (185°C).
Pressure Limit:: 150 psig (10.34 bar).
Enclosure Rating:: General purpose. Optional weatherproof.
Switch Type:: SPDT snap switch or mercury switch. Optional DPDT or two stage.
Electrical Rating:: Snap switch: 15 A @ 120/240/480 VAC, 0.5 A @ 120 VDC resistive, 0.25 A @ 240 VDC resistive. Mercury switch: 4 A @ 120 VAC/DC, 2 A @ 240 VAC/DC.
Electrical Connections:: Screw terminal.
Conduit Connection:: 7/8" (22.23 mm) hole for 1/2" (12.7 mm) conduit.
Process Connections:: 1" female NPT.
Mounting Orientation:: Vertical.
Deadband:: Approximately 1-1/2" (38.1 mm).
Specific Gravity:: 0.88 min.
Options:: Manual reset.
Weight:: 20 lb (9.1 kg).
Agency Approvals:: CSA, UL. (Snap switch is not rated).

Features

Special snap action switch mechanism options eliminates frequent operation due to surging water level
Transparent cover provides convenient visible operation of the switch
Flanged chamber for easy clean out and replacement of float or switch mechanism without removing the unit from piping

Support Library

Product Literature

Manuals

Instruction Manual

Catalog Pages

Series 123/125 Catalog Page

SDS

Mercury

Approvals

Drawings

Model Chart

EXAMPLE	123	2		123-2 Liquid Level Control with SPST mercury switch closing on level increase, minimum specific gravity 0.88, cast iron body, general purpose case, switch rated at 10 amp 120 VAC/DC, 5 amp 24 VAC/DC, pressure rating 150 psi (10 bar), maximum process temperature 365°F (185°C).
CONNECTION	123			Single Stage, Automatic Reset, Brass Trim, NEMA 1
	123XLW			Replacement Float, Cap, and Switch Assembly Only, No chamber for 123
	123RU			Single Stage, Manual Reset, Brass Trim, NEMA 1
	123RL			Single Stage, Manual Reset, Brass Trim, NEMA 1
	123RUXLW			Replacement Float, Cap, and Switch Assembly Only, No chamber for 123RU
	123RLXLW			Replacement Float, Cap, and Switch Assembly Only, No chamber for 123 RL
	123XLS			Replacement Switch Assembly Only for 123
CIRCUITS		2		9-51 NC SPST Mercury Switch
		3		9-51 NO SPST Mercury Switch
		103		(2) 9-51 NO DPST Mercury Switch
		127		(2) 9-51 NO DPST Mercury Switch
		151V		(2) 9-35 4-wire SPST Vibration Dampened Mercury Switch
		152		9-62 4-wire SPST Mercury Switch
		153		9-64 3-wire SPDT Mercury Switch
		156		(2) 9-51 4-wire SPST Mercury Switch
		160		9-61 NO SPST & 9-51 NC 4-wire SPST Mercury Switch
		162		9-51 NO 4-wire SPST & 9-61 NC SPST Mercury Switch
		702		9-51 NO SPST & 9-64 3-wire SPDT Mercury Switch
		705		9-51 NO SPST & 9-64 3-wire SPDT Mercury Switch
		729		9-64 3-wire SPDT Mercury Switch
		804		(2) 9-64 DPDT Mercury Switch
		7000-153		SPDT Snap Switch
OPTIONS			STW	Stainless steel tag wiring
			23720	Fungus proofing special 23720
			440V	440 volt option for circuits

EXAMPLE	125	4820		125-4820 Liquid Level Control with SPST mercury switch closing on level fall, minimum specific gravity 0.88, cast iron body, general purpose case, switch rated at 10 amp 120 VAC/DC, 5 amp 24 VAC/DC, pressure rating 150 psi (10 bar), maximum process temperature 365°F (185°C).
CONNECTION	125			Two Stage, Automatic Reset, Brass Trim, NEMA 1
	125XLW			Replacement Float, Cap, and Switch Assembly Only, No chamber for 125
	125XLS			Replacement Switch Assembly Only for 125
CIRCUITS		4806		(2) 9-64 6-wire DPDT Mercury Switch
		4810		9-64 3-wire SPDT Mercury Switch
		4814		(2) 9-51 NO DPST Mercury Switch
		4815		(2) 9-51 4-wire SPDT Mercury Switch
		4820		9-51 NC SPST Mercury Switch
		4821		9-51 NO SPST Mercury Switch
		4822		Consult factory for details.
		4823		2 Stage Control, (2) 9-51 Mercury Switches
		4828		(2) 9-35AV 4-wire SPDT Mercury Switch
		4829		Consult factory for details.
		4831		2 Stage Control, (2) 9-51 NO SPST Mercury Switches
		4849		2 Stage Control, (2) 9-51 NO SPST Mercury Switches
		4853		2 Stage Control, (2) 9-64 3-wire SPDT & (1) 9-51 NO SPST
		4855		2 Stage Control, (2) 9-64 3-wire SPDT & (1) 9-51 NC SPST
		4857		Consult factory for details.
		5822		Consult factory for details.
		5823		2 Stage Control, (2) 9-51 Mercury Switches
		5831		2 Stage Control, (2) 9-51 NO SPST Mercury Switches
		5849		2 Stage Control, (2) 9-51 Mercury Switches
OPTIONS			STW	Stainless steel tag wiring
			23720	Fungus proofing special 23720
			2507	440 volt option for circuits

*Cast iron chamber is not for use with lethal or flammable substances, either liquid or gaseous.

FAQ

Questions

Question

Why is the minimum specific gravity important on the float level switches?

Answer

If a medium has a lower s.g. than the rated minimum for a float, the float will sink through the media and the switch will not operate.

Related

Reviews

Write Your Own Review

Only registered users can write reviews. Please Sign in or create an account

Accessories

Model	Description	Availability*	Price
121-14-1	Body gasket	4-5 Weeks*	$81.65
45-26SS	SS float	1-2 Weeks*	$645.85
18-110L	Lexan cover, general enclosure	1-2 Weeks*	$131.05
121-116	Gland assembly	1-2 Weeks*	$225.70