24V DC
100V AC
・Mounting screw
R1(MPT) or NPT(option)
Never remove the cover when power is applied. This can result in electric shock.
A-QS-90003-A
When a flow rate increases,the actuating plate⑦ will move while the resistant force ordering.
The electric contact block is completely sealed from the fluid in the pipe line by a bellows.
(No freezing, no condensation)
C: Common terminal
B: Normally closed terminal
A: Normally open terminal
Flow rate increase
B
A
C
applicable load
Small load type
Standard
（D）
DC high load type
Voltage
symbol
symbol
Resistive
Voltage
current load
Maximum
0.1
0.1
Minimum
0.01
0.01
Type name,
（K）
load
Motor
load
load
Lamp
2
5
0.05
5
3
5
1.5
1.5
0.5
1.5
1.25
1.5
3
10
0.5
6
15
15
Type name,
250V DC
125V DC
125V DC
30V DC
250V AC
125V AC
（G）
・Electrical ratings
Unit: A
・Contact structure
Single-pole double-throw
・Maximum operating pressure
0.98 MPa
・Ambient humidity
80 %RH or less
・Ambient temperature
-25 to +80 ℃
・Allowable fluid temperature
5 to 80 ℃
fluid and vibration. Paddle can be damaged.
or stainless paddle（option）
・Liquid contacting material
Copper alloy
・Endurance operations
100,000 operations
・Structure
Open
Type FQS Flow Switch with SPDT micro switch detects the fluid flow in pipe line.
Use fluid with flow velocity of 2m/s or less. In addition, avoid strong pulsating
If the grounding is not appropriate, this can result in electric shock.
water pipe, lightning rod or the grounding wire of a telephone line.
Connect the switch to ground. Do not connect the grounding wire to a gas pipe,
fluid in liquid form. Gas or liquid mixed with gas causes unstable operations.
Use fluid that does not corrode the liquid contacting material. In addition, use
In addition, paddles can be damaged.
The switch does not work if fluid flows in the opposite direction.
Install the switch so that the arrow indication and the fluid flow match.
Incorrect operations or water leakage can occur.
Do not turn screws other than the operating value setting screw.
Do not connect a load exceeding the electric rating. This can result in bad contacts.
Do not sprinkle water over the microswitch. This can result in electric shock.
Connect wiring after turning off power. This can result in electric shock.
operating this flow switch could cause personal injury and/or
property damage. Save these instructions for future use.
Warning
B. NOTE FOR SAFETY
A. Failure to read and follow all instruction carefully before installing or
D. SPECIFICATIONS
C. DESCRIPTION
MARK
Terminal
Paddle 3
Paddle 2
Paddle 1
Screwed in depth
6
7
2
8
5
4
3
1
Q'ty.
Parts Name
1
Flow Adjusting Screw
Metal Fitting For
5
Flow Adjusting Screw
Adjusting Spring
Actuating Plate
1
8
1
7
1
6
Adjusting Screw
Micro Switch
Insulated Plate
Label
1
4
1
3
1
2
1
1
№
FLOW
1/2
PADDLE TYPE FLOW SWITCH
FQS
APR.
1991
Installation and Instruction
Approved by
Drawing Number
Catalog Number
Name
date
drawn by
PLRCA.PI.GK0.A1.02 / 520H3006
© Danfoss Saginomiya
