Mercoid Series 1221/1223/1224
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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. Download Catalog Cut Sheet
• Oil Refineries
• Chemical Plants
• Power Generating Stations
• Pumping Stations
• Heat Transfer Systems
• Sanitary/Wastewater Facilities
• Drip Legs
• Hydraulic Systems
• Boiler
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Specifications:
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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).
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).
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Model Chart (click to open/close)
EXAMPLE |
1221 |
WT |
7810 |
C1 |
40 |
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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 |
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One Vertical and One Horizontal 1" NPT |
1223 |
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One Vertical and One Horizontal Flanged Connection |
1224 |
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Two Vertical Flanged Connections |
ENCLOSURE |
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G |
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General Purpose, NEMA 1 |
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WT |
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Weatherproof, NEMA 3R, 4, 4X |
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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. |
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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. |
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 |
CHAMBER MATERIAL |
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C1 |
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Carbon Steel Body |
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C216 |
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316SS Body |
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HFC1 |
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Heat Fins & Carbon Steel Body |
MINIMUM
SPECIFIC
GRAVITY |
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40 |
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0.40 Specific Gravity |
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140 |
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0.40 Specific Gravity & 150# Flange |
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340 |
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0.40 Specific Gravity & 300# Flange |
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640 |
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0.40 Specific Gravity & 600# Flange |
OPTIONS |
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H2 |
H2 Socket Weld Hub |
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R |
Manual Reset, Single Stage |
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R1 |
Manual Reset, Lower Stage 2-Stage Control |
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R2 |
Manual Reset, Upper Stage 2-Stage Control |
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R3 |
Manual Reset, Both Stages 2-Stage Control |
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STW |
SS Tag Wired |
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01 |
Breather Only |
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02 |
Drain Only |
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12 |
Breather & Drain |
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23720 |
Fungus Proofing |
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Electrical Circuits 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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30V
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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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-4820
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-4820
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-21
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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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-4821
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-4821
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-20
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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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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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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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-4814
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-4814
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-13
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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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-4813
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-4813
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-14
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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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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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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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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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†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. |
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