Series 1261/1263/1264 Welded Chamber Level Control

External Mount, Pressure to 1750 psig (121 bar), and Temperature to 500°F (260°C)

High pressure capability in a heavy duty welded carbon steel chamber provides a rugged heavy duty control to operate up to 1750 psi (121 bar) at 100°F (38°C), and 1650 psi (114 bar) at 500°F (260°C) with a minimum specific gravity of 0.60. Electrical enclosures are suited for general purpose NEMA 1, weatherproof NEMA 4X, explosion-proof or explosion-proof – vapor proof NEMA 7, 9 groups B, C, D, E, F, G, Division I and II requirements. 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, low DC voltage, high DC current, or high temperature applications. Check the model chart for the switch best suited for your application.

Product Applications

  • Oil Refineries
  • Chemical Plants
  • Power Generating Stations
  • Pumping Stations
  • Heat Transfer Systems
  • Sanitary/Wastewater Facilities
  • Drip Legs
  • Hydraulic Systems
  • Boilers

Models & Ordering

Build Your Custom Part. Use our Product Configurator

Specifications

C1-60:
Minimum specific gravity 0.60. Process pressure 1750 psig (121 bar) at 100°F (38°C), 1650 psig (114 bar) at 500°F (260°C).
Temperature Limit:
Ambient Temperature: 212°F (100°C); Process Temperature: up to 500°F (260°C).
Switch Type:
Snap switch or mercury. See Model Chart.
Electrical Rating:
Electrical Rating: See Model Chart.
Wiring Connections:
G, WT or E enclosure: terminal block; EV enclosure: 18" (460 mm) leads.
Process Connections:
Combination 1" NPT/socket weld hubs or flanges. See Model Chart.
Enclosures:
G: painted steel and aluminum; WT: painted steel, aluminum and neoprene; E: aluminum; EV: aluminum, neoprene.
Wetted Parts:
C1 construction is carbon steel, 303SS, 304SS and 430SS.
Weight:
1261: 79 lb (36 kg); 1263: 89 lb (40 kg); 1264: 92 lb (42 kg).
Suggested Specifications:
Liquid level control shall be 1261 (1263) (1264) Series with 1" combination NPT/socket weld hub (flanged) process connections. Chamber shall be welded and suitable for operation at 1650 psi (114 bar) and 500°F (260°C) with a minimum specific gravity of 0.60. Circuit shall be (hermetically sealed) snap action (mercury) switch (SPST) (SPDT) (DPDT). Enclosure shall be general purpose (weatherproof) (explosion-proof) (explosion-proof – vapor proof). Switch mechanism shall be gravity return and shall be activated by a stainless steel float.

Model Chart

   
EXAMPLE 1261 WT 7810 C1 60   1261-WT-7810-C1-60 Liquid Level Control, weatherproof enclosure, SPDT snap switch, fixed deadband, automatic reset, operating pressure 1750 psig (121 bar) at 100°F (38°C), 1650 psig (114 bar) at 500°F (260°C), side/bottom process connections, 1" NPT, minimum specific gravity 0.60.
CONNECTION 1261           One Vertical and One Horizontal 1" NPT
1263           One Vertical and One Horizontal Flanged Connection
1264           Two Vertical Flanged Connections
1264T            
ENCLOSURE    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. CSA approved Groups C, D, E, F, G only.
  EV         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)
    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
CHAMBER MATERIAL       C1     Carbon Steel Body
      C216     316SS Body
MINIMUM
SPECIFIC
GRAVITY
        60   0.60 Specific Gravity (1261 only)
        660   0.60 Specific Gravity & 600# Flange (1263, 1264 only)
OPTIONS           H1 1" NPT Vent (1261, steel housing only)
          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
          01 Breather Only (E-Housing only)
          02 Drain Only (E-Housing only)
          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
†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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