G-18
FLOW SWITCHES
Visit www.GemsSensors.com for most current information.
Model Port Size
NPT
A
inch (mm)
B
inch (mm)
C Hex
inch (mm)
FS-200
and
FS-200
Adjustable
1˝ 3-1/4 (82.6) 3 (76.2) 1-25/32 (45.2)
1-1/4˝ 4 (101.6) 3-3/16 (80.9) 2-3/16 (55.5)
1-1/4˝ ss 4-1/2 (114.3) 3-3/16 (80.9) 2-3/16 (55.5)
1-1/2˝ 4-1/2 (114.3) 3-1/2 (88.9) 2-1/2 (63.5)
2˝ 5-3/8 (136.5) 4 (101.6) 3-3/32 (78.5)
UL Approved
Explosion-Proof
A
B
1/2" -NPT
BONNET
SWITCH
HOUSING
NPT PORT
INLET PORT
C
#18 AWG., 24" L.,
POLYMERIC JACKET
G-4 ill
FS-200 Series – General Purpose,
Straight-Through Flow Path
Flow Rate Settings: Fixed: 0.5 GPM to 100.0 GPM
Adjustable: 1.0 GPM to 15.0 GPM
Port Size: 1˝ NPT to 2˝ NPT
Primary Construction Material: Bronze or Stainless Steel
Setting Type: Fixed or Adjustable
The FS-200 Series offers accurate flow detection, with 1% repeatability, over a broad
range of flow settings and port sizes. Its durable construction delivers long-life
reliability in either water or oil. Generous flow paths keep pressure drop low. These
switches are ideal for detection of improper flow rates in high volume lubrication,
cooling or process systems.
FS-200 Adjustable Series switches offer the same accuracy and are as rugged as those
with fixed settings, but provide one additional feature: external adjustability. With these
versatile switches your choice of flow settings is diverse within a given range. An
ordinary, flat-blade screwdriver is all that’s required for the actuation adjustment.
Specifications
Wetted Materials
Housing
FS-200 Bronze or 316 Stainless Steel
FS-200 Adjustable Bronze
Shuttle Teflon®
Bonnet Bronze or Stainless Steel
Spring 316 Stainless Steel
Other Wetted Parts Viton®, Ceramic
Pressure Rating
Operating 400 PSIG (27.6 bar) @ 100°F (37.8°C)
Proof 800 PSIG (55.2 bar) @ 100°F (37.8°C)
Operating Temperature
FS-200 -20°F to +300°F (-29°C to +148.9°C)
FS-200 Adjustable -20°F to +200°F (-29°C to +93.3°C)
Repeatability 1% Maximum Deviation
Set Point Accuracy ±10%
Set Point Differential 15% Maximum
Switch* SPDT, 20 VA
Electrical Termination No. 18 AWG, 24˝ L., Polymeric Lead Wires
Red NC, Black Common, Orange NO
*See “Electrical Data” on Page X-5 for more information.
FS-200 Series
U.L. Recognized
File No. E31926
CSA Listed —
File No. LR30200
and LR22666
FM Approved —
File No. 0A8A3.AE
and 1H3A2.AX
FS-200 Adjustable
U.L. Recognized
File No. E31926
CSA Listed —
File No. LR22666
FM Approved —
File No. 0Q2A8.AE
Dimensions
Notes:
1. Adjustable versions available in 1 inch port sizes only.
2. Standard calibration is in water with units in a horizontal position.
3. Viscosity changes will affect setpoints. Typically, as viscosity
increases setpoints will decrease.
4. Consult Gems for special applications.
G-19
FLOW SWITCHES
Visit www.GemsSensors.com for most current information.
FS-200 Adjustable
Port Size
NPT
Flow
Setting
GPM
Part Numbers
Bronze Stainless
Steel
1”
0.5 27051 27059
127052 27060
227053 27061
327054 27062
427055 27063
527056 27064
627057 27065
827058 27066
1-1/4”
127067 27076
227068 27077
427069 27078
627070 27079
827071 27080
10 27072 27081
12 27073 27082
16 27074 27083
20 27075 27084
Port Size NPT Flow Setting Adjustment Range GPM Part Numbers
1”
1.0-6.0 26615
5.0-15.0 26616
2.0-8.0 26838
Port Size
NPT
Flow
Setting
GPM
Part Numbers
Bronze Stainless
Steel
1-1.2”
1.5 27085 27093
327086 27094
527087 27095
7.5 27088 27096
10 27089 27097
15 27090 27098
20 27091 27099
30 27092 27100
2”
227101 27109
427102 27110
527103 27111
10 27104 27112
15 27105 27113
25 27106 27114
35 27107 27115
50 27108 27116
SHUTTLE TYPE
4
3
2
0
1
0 5 10 15 20 25 30 35 40
FLOW RATE - GPM
PRESSURE DROP (PSID)
1.5
1.0
0.5
0
0 10 20 30 40 50 60 70 80
2.0
FLOW RATE - GPM
Tests conducted with units in horizontal position (lead wires up) with water at
+70°F (21°C).
PRESSURE DROP (PSID)
Part No. 27101
Part No. 27085
Part No. 27051
How To Order – Standard Models
Specify Part Number for the FS-200 Series based on desired housing material, port
size and flow setting, or based on flow setting range for FS-200 Adjustable versions.
FS-200 Series
Notes:
1. Flow settings for fixed versions are calibrated using water at +70°F on increasing flow, with units in a
horizontal position (lead wires up). Consult factory regarding special flow setting calibration, or liquids other
than water. Temperature changes will slightly affect the flow settings listed. Oil flow settings will vary with
viscosity.
2. Adjustable units that are set to customer specification are subject to GEMS test stand accuracy.
3. Use of 150 micron filtration is recommended.
4. Minimum 5 PSI line pressure required.
– Stock Items.
Pressure Drop - Typical
1˝ NPT and 1-1/2˝ NPT Ports
2˝ NPT Ports
FS-200 Series Flow 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 locations.
Units must be completely assembled at GEMS.
U.L. Approved — File No. E183854
For Remote Alarms –
See Page E-30
• Adjustable Volume
• Indoor Outdoor
• Solid-State
