Mercoid Series 102 / 203 / 204
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| Side Mounted-Chamber Type Level Control |
| Operating Pressures to 500 psig, 34 bar, Hermetically Sealed Snap Switch Option |
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 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. |
| Specifications: |
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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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Model Chart (click to open/close)
| EXAMPLE |
201 |
WT |
7810 |
10 |
HF |
C1 |
60 |
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201-WT-7810-60 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 (51 bar) at 100°F (38°C), 500 psi (34 bar) at 750°F (400°C). |
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| ENCLOSURE |
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G |
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General purpose, NEMA 1 |
UL |
CSA |
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WT |
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Weatherproof, NEMA 3R, 4, 4X. |
UL |
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E |
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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). |
UL |
CSA |
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EV |
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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). |
UL |
CSA |
CIRCUITS
(for electrical circuits see charts A & B below) |
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48XX |
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Single stage, mercury switch, see chart A. |
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48XX |
XX |
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Two stage, mercury switch, see chart A. |
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78XX |
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Single stage, snap switch, see chart B. |
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78XX |
XX |
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Two stage, snap switch, see chart B. |
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78XXHM |
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Hermetically sealed snap switch, see chart B. |
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98XX |
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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. |
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98XX |
XX |
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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. |
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10XX |
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Single stage, high temperature snap switch, continuous rating 800°F (425°C), see chart B, 201-C1-60 type rated 500 psi (34 bar), 201-C1-75 type rated at 650 psi (45 bar). |
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10XX |
XX |
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Two stage, high temperature snap switch, continuous rating 800°F (425°C), see chart B, 201-C1-60 type rated 500 psi (34 bar), 201-C-75 type rated at 650 psi (45 bar). |
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| WELDED CHAMBER CONSTRUCTION COMBINATION 1" NPT/SOCKET WELD HUBS |
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Refer to chart C below for pressure/temperature ratings. |
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C1 |
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Carbon steel body. |
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| 201 |
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C1 |
60 |
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Minimum specific gravity 0.60 side/bottom process connections, combination 1" NPT/socket weld hub. |
UL |
CSA |
| 201 |
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C1 |
75 |
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Minimum specific gravity 0.75 side/bottom process connections, combination 1" NPT/socket weld hub. |
UL |
CSA |
| WELDED CHAMBER CONSTRUCTION WITH FLANGED PROCESS CONNECTIONS |
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Refer to chart C below for pressure/temperature ratings. |
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| 203 |
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C1 |
160 |
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1" 150# flanges side/bottom process connection. |
UL |
CSA |
| 203 |
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C1 |
175 |
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1" 150# flanges side/bottom process connection. |
UL |
CSA |
| 203 |
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C1 |
360 |
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1" 300# flanges side/bottom process connection. |
UL |
CSA |
| 203 |
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C1 |
375 |
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1" 300# flanges side/bottom process connection. |
UL |
CSA |
| 203 |
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C1 |
660 |
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1" 600# flanges side/bottom process connection. |
UL |
CSA |
| 203 |
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C1 |
675 |
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1" 600# flanges side/bottom process connection. |
UL |
CSA |
| 204 |
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C1 |
160 |
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1" 150# flanges side/side process connection. |
UL |
CSA |
| 204 |
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C1 |
175 |
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1" 150# flanges side/side process connection. |
UL |
CSA |
| 204 |
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C1 |
360 |
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1" 300# flanges side/side process connection. |
UL |
CSA |
| 204 |
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C1 |
375 |
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1" 300# flanges side/side process connection. |
UL |
CSA |
| 204 |
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C1 |
660 |
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1" 600# flanges side/side process connection. |
UL |
CSA |
| 204 |
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C1 |
675 |
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1" 600# flanges side/side process connection. |
UL |
CSA |
| OPTIONS |
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HF |
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High temperature fins, should be considered if ambient temperature exceeds 500°F (260°C) for extended periods. |
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12 |
Breather and drain for E type explosion-proof enclosure. Recommended for high humidity or outdoor service. |
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ElecticalCircuits and Ratings (click to open/close)
| SWITCH TYPE |
SWITCH ACTION
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ELECTRICAL RATINGS IN AMPS
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ORDERING CODE
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AC
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DC
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SINGLE STAGE
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TWO STAGE
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120V
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240V
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440V
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125V
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250V
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LOWER
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UPPER
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CHART A
Mercury Contacts |
SP-ST open on level FALL |
10
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5
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3†
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10
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5
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-4821
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-4821
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-21
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UL
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CSA |
| SP-ST open on level RISE |
10
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5
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3†
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10
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5
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-4820
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-4820
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-20
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UL
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CSA |
| SP-DT one switch |
4
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2
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1†
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4
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2
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-4810
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-4810
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-10
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UL
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CSA |
| SP-DT two switches E.I.* |
10
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5
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3†
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10
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5
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-4815
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-4815
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-15
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UL
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CSA |
| DP-ST two switches E.I.* open on level FALL |
10
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5
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3†
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10
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5
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-4813
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-4813
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-13
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UL
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CSA |
| DP-ST two switches E.I.* open on level RISE |
10
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5
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3†
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10
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5
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-4814
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-4814
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-14
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UL
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CSA |
| DP-DT two SP-DT switches |
4
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2
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1†
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4
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2
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-4806
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-4806
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-06
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UL
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CSA |
CHART B
snap action contacts |
SP-DT one switch |
12
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5
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3†
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0.5**
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0.25**
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-7810
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-7810
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-10
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UL
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CSA |
| DP-DT Two SP-DT switches |
12
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5
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3†
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0.5**
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0.25**
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-7806
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-7806
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-06
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UL
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CSA |
| SP-DT one hermetically sealed switch*** |
5
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5
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5**
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-7810HM
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-7810HM
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-10HM
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| DP-DT two hermetically sealed SP-DT switches*** |
5
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5
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5**
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-7806HM
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-7806HM
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-06HM
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| DP-DT two SP-DT switches |
10
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3
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10‡
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3‡
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-9806
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-9806
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-06
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| SP-DT one switch |
10
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3
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10‡
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3‡
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-9810
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-9810
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-10
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DP-DT two SP-DT switches |
2
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2
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0.4**
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0.25**
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-1006
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-1006
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-06
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SP-DT one switch |
2
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2
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0.4**
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0.25**
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-1010
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-1010
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-10
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| †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. |
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Chart C (click to open/close)
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SERIES
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MOUNTING STYLE
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MINIMUM SPECIFIC GRAVITY
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PRESSURE RATING AT
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FLANGE CLASS (psi)
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ORDER CODE
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38°C
100°F
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400°F
750°C
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201
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1" NPT
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0.6
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600 psi
41 bar
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500 psi
34 bar
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--
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C1-60
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201
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1" NPT
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0.75
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1000 psi
69 bar
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750 psi
52 bar
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--
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C1-75
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203
204
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FLANGED
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0.6
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275 psi
19 bar
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100 psi
7 bar
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150
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C1-160
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203
204
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FLANGED
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0.75
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275 psi
19 bar
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100 psi
7 bar
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150
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C1-175
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203
204
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FLANGED
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0.6
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600 psi
41 bar
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425 psi
29 bar
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300
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C1-360
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203
204
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FLANGED
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0.75
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720 psi
50 bar
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425 psi
29 bar
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300
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C1-375
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203
204
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FLANGED
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0.6
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600 psi
41 bar
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500 psi
34 bar
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600
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C1-660
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203
204
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FLANGED
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0.75
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100 psi
69 bar
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750 psi
52 bar
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600
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C1-675
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| Popular Model |
| Model Number |
Description |
Usually Ships |
| 201-WT-7810-C1-60 |
Chamber type level control, side mounted, SPDT snap switch. |
1-2 Weeks |
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| Previous Page |
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