Series 1241/1243/1244 Flanged Chamber
External Mount, Pressure to 1440 psig (99 bar), Hermetically Sealed Switches and Temperature to 475°F (246°C)
A removeable stainless steel float enclosed in a flanged carbon steel chamber is featured in the durable, field proven 1241 series. External side mount series includes 1" NPT process connections as standard or 1" flanges as options. Pressure and temperature limits are 1440 psi (99 bar) at 100°F (38°C) and 1275 psi (87.9 bar) at 475°F (246°C). Minimum specific gravity for all models is 0.60. The models shown can be ordered with a variety of electrical arrangements including SPST, SPDT, or DPDT circuits in hermetically sealed snap action or mercury contacts. Switches can be ordered open on level rise or fall. Single pole double throw electrically independent circuits are available as well as low current or high DC current applications. A full range of enclosures are offered including general purpose NEMA-1; weatherproof NEMA-4X; (explosion-proof) and (explosion-proof - vapor-proof) groups B, C, D, E, F, G, NEMA-7-9.
- Oil refineries, chemical plants, power generating stations, pumping stations, heat transfer systems, sanitary/waste water facilities, drip legs, hydraulic systems, boilers.
Models & Ordering
- Minimum Specific Gravity:
- Switch Type:
- Snap action or mercury switch. See charts A and B.
- Electrical Ratings:
- See charts A and B.
- Wiring Connections:
G, WT or E enclosure, terminal block;
EV enclosure, 18" (460 mm) leads.
- Process Connections:
- 1" NPT standard (flanges optional); See model chart.
- Enclosure Rating:
- See model chart.
G, painted steel and aluminum;
WT, painted steel, aluminum and neoprene;
EV, aluminum and neoprene.
- Wetted Parts:
- C1 construction. Chamber: carbon steel. Trim: 303SS, 304SS, and 430SS (316SS and 430SS optional).
- 1241, 34 lb (15 kg); 1243, 44 lb (20 kg); 1244, 51 lb (23 kg).
- Suggested Specifications
Liquid level control shall be 1241 (1243) (1244) Series with flanged carbon steel chamber. Process connections shall be 1" NPT (socket weld hub) (flanged). Unit shall be suitable for operation at 1440 psi (99 bar) at 100°F (38°C); 1275 psi (87.9 bar) at 475°F (246°C) with a minimum specific gravity of 0.60. Switch mechanism shall be gravity return and shall be activated by a stainless steel float. Circuit shall be (hermetically sealed) snap action (mercury) switch, (SPST) (SPDT) (DPDT). Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosionproof) (vapor-proof).
|EXAMPLE||1241||WT||7810||C1||75||L12||1241-WT-7810-10-C1-60 Liquid Level Control, flanged carbon steel chamber, weatherproof enclosure, SPDT snap action switch, fixed deadband, automatic reset. Operating pressure 1440 psig @ 100°F, side/bottom 1" NPT process connections, minimum s.g. 0.60.|
|CONNECTION||1241||Side/bottom process connections. 1" NPT hubs.|
|1243||1" 600# flanges side/bottom process connection.|
|1244||1" 600# flanges side/side process connection.|
|1244T||1244T Liquid Level Control|
|ENCLOSURES||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|
|EV||Explosion-proof/Vapor-proof, NEMA 7, 9, Class I Groups B, C, D, Class II Groups E, F, G|
(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|
|10XX||Single stage. High temperature snap switch. Continuous rating 800°F (425°C). See Chart B.
211-C1-60 type rated at 175 psi (12 bar).
|10XX-XX||Two stage. High temperature snap switch. Continuous rating 800°F (425°C). See Chart B.
211-C1-60 type rated at 175 psi (12 bar).
|CHAMBER MATERIAL||C1||Carbon Steel Body|
|HFC1||Heat Fins & Carbon Steel Body|
|1241||60||0.60 Specific Gravity (1241 only)|
|1243,1244||660||0.60 Specific Gravity & 600# Flange (1243, 1244 only)|
|OPTIONS||STW||SS Tag Wired|
|E||01||Breather Only (E-Housing only)|
|E||02||Drain Only (E-Housing only)|
|E||12||Breather & Drain (E-Housing only)|
|SWITCH TYPE||SWITCH ACTION||ELECTRICAL RATINGS IN AMPS||ORDERING CODE|
|AC||DC||SINGLE STAGE||TWO STAGE|
|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|
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|
DP-DT Two SP-DT switches
SP-DT One switch
‡10 amp inductive (polarized) at 125 VDC.
- Why is the minimum specific gravity important on the float level switches?
- 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.
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