LEVEL 사업부
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◊ Operated Type Float Level Switch

◈ Features
 • High load carrying capacity
 • Environmental safety
 • Vibration resistance

◈ Operating Principle
  This level switches have a displacer, switch unit in which micro switch and magnetic are assembled.
  The operation is based upon simple buoyancy.
  Immersion of the displacers in the liquid results in buoyancy force change, which moves the attraction sleeve upward or daunward.
  Simultaneously, the contact of micro switch is changed by magnetic force as the attraction sleeve is the field of magnet force.
  This principle allows adjustment of the switching point up to 15mm by moving the switch unit position.



◈ Model Classification and Spercification

Model OLS-
4F□□
OLS-
4F□□
OLS-
3F□□
OLS-
3F□□
OLS-
4C□□
OLS-
3C□□
OLS-
3C□□
Chamber material
and size
Carbon
steel(4")
Carbon
steel(4")
Carbon
steel(3")
Carbon
steel(3")
Carbon
steel(4")
Carbon
steel(3")
Carbon
steel(3")
Max.No.of
switch mechanism
2 2 1 1 2 1 1
control
pressure
rating
Psig 100℉ 285 800 285 350 800 300 350
750℉ 95 450 95 280 450 225 260
Bar 38 20 41 20 24 41 21 24
400 7 31 7 18 31 16 18
Minimum liquid Sp.Gr 0.57 0.65 0.67 0.67 0.65 0.57 0.67
Switch contact
rating
250VAC,
5A
250VAC,
5A
250VAC,
5A
250VAC,
5A
250VAC,
5A
250VAC,
5A
250VAC,
5A
Switch contact type SPDT  SPDT SPDT   SPDT  SPDT  SPDT SPDT 
DIMENSION
Model OLS-4F(L) OLS-4F(H) OLS-3F(L) OLS-3 F(H)
B(1) IN. 3 2½" 3 3
MM. 76 64 76 76
C(1) IN. 4 3¼" 3¼" 3¼"
MM. 102 83 108 108
D(2) IN. 10½" 10½" 9 9
MM. 267 267 229 229
E(2) IN. 3 11/6 3 11/6 3 11/6 3 11/6
MM. 94 94 81 81
F IN. 6½" 6½" 
MM. 165 152 152 152
Model OLS-4C OLS-3C(L) OLS-3C(H)
B(1) IN. 2¼" 2⅝" 2½"
MM. 57 67 64
C(1) IN. 3 3½" 3¾"
MM. 76 89 95
D(2) IN. 10½" 10½" 9
MM. 267 267 229
E(2) IN. 3 11/6 3 11/6 3 11/6
MM. 94 94 81
F IN. 6½" 6½" 
MM. 165 152 152
 • NOTE :
  (1) Norminal dimensions depend on minimum differential setting, minimum liquid
      specific gravity and single switch function.
  (2) Dimensions are for 1" NPT or S.W.type only.