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.

Product Applications

  • Oil refineries, chemical plants, power generating stations, pumping stations, heat transfer systems, sanitary/waste water facilities, drip legs, hydraulic systems, boilers.

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

Minimum Specific Gravity:
0.60.
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.
Enclosure:
> G, painted steel and aluminum;
WT, painted steel, aluminum and neoprene;
E, aluminum;
EV, aluminum and neoprene.
Wetted Parts:
C1 construction. Chamber: carbon steel. Trim: 303SS, 304SS, and 430SS (316SS and 430SS optional).
Weight:
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).

Model Chart

 
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
CIRCUITS
(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 
      C216     316SS Body
SPECIFIC
GRAVITY
1241       60   0.60 Specific Gravity (1241 only)
1243,1244       660   0.60 Specific Gravity & 600# Flange (1243, 1244 only)
OPTIONS           R Manual Reset, Single Stage
          R1 Manual Reset, Lower Stage 2-Stage Control
          R2 Manual Reset, Upper Stage 2-Stage Control
          R3 Manual Reset, Both Stages 2-Stage Control
          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)
          23720 Fungus Proofing
CHARTS A & B - ELECTRICAL CIRCUITS AND RATINGS
SWITCH TYPE
SWITCH ACTION
ELECTRICAL RATINGS IN AMPS
ORDERING CODE
AC
DC
SINGLE STAGE
TWO STAGE
120V
240V
440V
30V
125V
250V
LOWER
UPPER
CHART A
Mercury Contacts
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
CHART B
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

2 2    

0.4**

0.25**

-1006

-1006 -06

SP-DT One switch

2
2
 
 

0.4**

0.25**

-1010
-1010
-10
†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.

Product Literature

Manuals

Catalog Pages

SDS

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.

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