Mercoid
Series 123/125 Cast Iron Chamber - Water Level Control
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| Heavy Duty, Cast Iron Chamber |
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 Designed for boiler applications, the Model 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.
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| SPECIFICATIONS |
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Service: Compatible liquids. Cast iron is not for use with lethal or flammable substances either liquid or gaseous.
Wetted Materials: Body: cast iron. Float and Trim: 304 SS. Packing Gland: brass. Packing: carbon. Body Gasket: carbon.
Temperature Limit: 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: 15A @ 120/240/480 VAC, 0.5A @ 120 VDC resistive, 0.25A @ 240 VDC resistive. Mercury Switch: 4A @ 120 VAC/DC, 2A @ 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.
Weight: 20 lb (9.1 kg).
Agency Approvals: UL and CSA (snap switch is not rated).
Deadband: Approximately 1-1/2" (38.1 mm).
Specific Gravity: 0.88 minimum.
Options: Manual reset.
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| POPULAR MODELS |
| Model Number |
Description |
Usually Ships |
| 123-153 |
Water level control, cast iron chamber, SPDT mercury switch. |
Same Day |
| 123-7000-153 |
Water level control, cast iron chamber, SPDT snap switch. |
Same Day |
| 123-2 |
Water level control, cast iron chamber, SPST mercury switch, closes on increase. |
Same Day |
| 123-3 |
Water level control, cast iron chamber, SPST mercury switch, opens on increase. |
Same Day |
| 123-804 |
Water level control, cast iron chamber, DPDT (2 SPDT) mercury switches. |
1-2 Weeks |
| 125-4820 |
Water level control, cast iron chamber, SPST mercury switch, closes on decrease. |
1-2 Weeks |
| 125-4821 |
Water level control, cast iron chamber, SPST mercury switch, opens on decrease. |
1-2 Weeks |
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| MODEL
CHART - SERIES 123/125 |
| EXAMPLE |
123
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2
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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 120VAC/DC, 5 amp 24 VAC/DC, pressure 150 psi (10
bar), maximum process temperature 365°F (185°C). |
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| CONSTRUCTION |
123
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Packing gland construction, cast iron chamber*,
general purpose case, snap acting movement assembly. |
UL |
CSA |
| CIRCUIT |
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2
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SPST, close on level increase, mercury switch,
rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC, motor rating 1
hp 120 VAC, 3/4 hp 240 VAC, 1/3 hp 120/240 VDC. |
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3
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SPST, open on level increase, mercury switch,
rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC, motor rating 1
hp 120 VAC, 3/4 hp 240 VAC, 1/3 hp 120/240 VDC. |
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153
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SPDT, one circuit closes as one circuit opens,
mercury switch, rated 4 amp 120 VAC/DC, 2 amp 240 VAC/DC,
common ground. |
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156
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SPDT, consisting of two SPST mercury switches,
electrically independent, one circuit closes as one circuit
opens, each switch rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC. |
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804
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DPDT, consisting of two SPDT mercury switches,
each switch has common ground, two circuits close as two
circuits open, each switch rated 4 amp 120VAC/DC, 2 amp 240
VAC/DC. |
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7000-153
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SPDT snap-action switch, rated 15 amp 120/240/480
VAC, 1/2 amp 120 VDC Rees., 1/4 amp 240 VDC res. |
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| OPTIONAL HOUSING |
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WP |
Weatherproof adlet housing. |
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| EXAMPLE |
125 |
4820 |
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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 120VAC/DC, 5 amp 240 VAC/DC, pressure rating 150 psi
(10 bar), maximum process temperature 365°F (185°C). |
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| CONSTRUCTION |
125 |
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Packing gland construction, cast iron chamber*,
general purpose case, direct acting movement assembly. |
UL |
CSA |
| CIRCUIT |
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4820 |
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SPST mercury switch, close on level fall,
rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC, motor rating 1
hp 120 VAC, 3/4 hp 240 VAC, 1/3 hp 120/240 VDC. |
UL |
CSA |
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4821 |
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SPST mercury switch, open on level fall,
rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC, motor rating 1
hp 120 VAC, 3/4 hp 240 VAC, 1/3 hp 120/240 VDC. |
UL |
CSA |
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4810 |
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SPDT, one circuit closes as one circuit opens,
mercury switch, rated 4 amp 120 VAC/DC, 2 amp 240 VAC/DC,
common ground. |
UL |
CSA |
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4815 |
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SPDT, consisting of two SPST mercury switches,
electrically independent, one circuit closes as one circuit
opens, each switch rated 10 amp 120 VAC/DC, 5 amp 240 VAC/DC. |
UL |
CSA |
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4806 |
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DPDT, consisting of two SPDT mercury switches,
each switch has common ground, two circuits close as two
circuits open, each switch rated 4 amp 120VAC/DC, 2 amp 240
VAC/DC. |
UL |
CSA |
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