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FS-925E Series

General Purpose

 

FS-925 Series

Quick Specs...

  • Flow Rate Settings: 0.4 - 6.0 (l/min) with pre-adjusted set points 
  • Port Size: 1/4" NPT
  • Primary Construction Material: Brass or Stainless Steel
  • Setting Type: Fixed 


 

Overview Specifications Dimensions Related Info  

Overview / Design Principle:

This series of precision-calibrated switches provides reliable and consistent performance; repeatability is within 1%. FS-925 units are factory preset for actuation at specified flow rates.

These switches provide accurate detection of excessive or insufficient flow rates in such applications as: protecting against loss of fluid flow in hydraulic systems, assuring proper coolant flow in semiconductor processing equipment, monitoring high pressure lubrication systems, and ensuring proper air flow in water/waste systems.

Applications:

  • Electronic Equipment: Laser Heads, Welders, Power Supplies, High Speed Spindles, X-Ray Tubes, Semiconductor Equipment
  • Bearings or Gears: Presses, Rotating Equipment, Conveyors, Machine Tools, Robotics
  • Processing & Dispensing Equipment: Water Purifications and Filtering, X-Ray Film Processing, Beverage Dispensing, Chemical Additives, Gas Sampling, Distilling

 

 

Specifications:

Max. Flow

12 l/min

Max. Operating Pressure

68 bar

Proof Pressure

100 bar

Temperature Range  - with Polysulfone piston (standard), with cable, with plug connector: -20°C to +80°C
- with metal piston and terminal box: -20°C to +150°C
 
Set Points (l/min)  0.4; 1.0; 2.0; 3.0; 4.0; 6.0 

Switching Function (related to increasing flow)

NC, NO, SPDT

Mounting Position  any position 
Factory Mounting Position with Set Point Adjustment  vertical, inlet port down, electrical connection up 
Repeatability  ± 1%

Adjustment Accuracy

± 10%

Hysteresis

max. 15%

Mounting

G 1/4"

Electrical Connections

- cable: PVC, 2 or 3 x 0.34 mm2 (length: approx. 1m)
- plug connector per DIN 43650
- terminal box

Enclosure

- IP 65

Electrical Data Contact Rating

- SPST (NC/NO): max. 100 VA, 3 A, 220 V~
- SPDT: max. 20 VA, 0.5 A, 250 V~

Weight

0.5 kg

Approvals

CE

 IMPORTANT REED SWITCH PROTECTION INFORMATION: Read before installing.

Switches are U.L. Approved for Class I, Division 2, Groups A, B, C, D hazardous areas.
They are also available with FM-approved explosion-proof junction box for Class I, Division 1, Group D hazardous loactions. Units must be completely assembled at Gems.

 

Flow Settings, Air (Typical) Dependent on operating line pressure. Examples of set point ranges at a given line pressure are shown below.

Line Pressure

Actuation Point 

FS-925

 FS-926

 M"

 Max.

 M"

Max.

5 PSIG (Minimum)

0.5 SCFM

10 SCFM

2 SCFH

15 SCFH

100 PSIG

1.5 SCFM 

25 SCFM

7 SCFH

50 SCFH

Gas Calibration
Water flow units should not be used for air/gas applications: Gas flow units have a special dash-pot piston for reliable operation. Gas calibration is dependent upon line pressure, switch orientation, and the specific type of gas. The calibrated flow set point is subject to change with fluctuations in line pressure.

 Dimensions:
 DimFS925.gif
A 1/4" (6.3 mm)
B 9/32" (7.1 mm) MTG. Holes (2)
C 2-3/8" (60.3 mm)
D 1/2" (12.7 mm)
E 1-1/4" (31.7 mm)
F 1/4" NPT Both Ports
G 27/32" (21.4 mm)
H 4-1/8" (104.7 mm)
I 3/4" (19.0 mm)
J 1" (25.4 mm)
K 1-3/4" (44.4 mm)

Pressure Drop Data:

FS925PressureGraph

Test conducted with units in vertical position (lead wires up) with water at +70°F (21°C).

Additional Product Information:
Design Data

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