Gems Sensors & Controls FS-930 Specifications
FLOW SWITCHES
UL Approved
Explosion-Proof
1/4" (6.3 mm)
2-3/8"
(60.3 mm)
1-1/4" (31.7 mm)
3/4"
(19.0 mm)
1/4" NPT
BOTH PORTS
1-3/4"
(44.4 mm)
4-1/8"
(104.7 mm)
1"
(25.4 mm)
27/32" (21.4 mm)
9/32" DIA. (7.1 mm)
MTG. HOLES (2)
1/2" (12.7 mm)
G-11b ill
1/2"
(12.7 mm)
FS-930 Series – Oil Flow Switch,
Compensates For Viscosity Change In Fluids
Flow Rate Settings: 0.1 GPM to 1.0 GPM
Port Size: 1/4˝ NPT
Primary Construction Material: Brass
Setting Type: Fixed
A unique, patented piston design assures accuracy within 20% over a full range of
viscosities—from 40 to 1000 SSU. Ideal for use in applications where liquids of different
viscosities are blended; or for use in lubrication systems where oil flow monitoring is
critical at start-ups. Switch compensates for viscosity changes automatically. Each unit
is factory preset, using 300 SSU oil, for actuation at specified flow rates.
Specifications
Wetted Materials
Housing Brass
Piston Brass
Spring 316 Stainless Steel
O-Ring Viton
Other Wetted Parts Epoxy
Pressure Rating
Operating, Maximum 1000 PSIG (69 bar)
Proof 2500 PSIG (172 bar)
Burst 5000 PSIG (345 bar)
Operating Temperature -20°F to + 300°F (-29°C to +148.9°C)
Repeatability 1% Maximum Deviation**
Set Point Accuracy ±10%
Set Point Differential 15% Maximum
Switch* SPDT, 20 VA
Inlet/Outlet Ports 1/4˝ NPT
Electrical Termination No. 18 AWG, 24˝ L., Polymeric Lead Wires
Explosion-Proof Approvals U.L. Approved for Class I, Division 2, Groups A, B,
C, D. Also available with FM approved, explosion
proof junction box for Class I, Division 1, Group D
hazardous locations.
U.L. Approved — File No. E183854
* See “Electrical Data” on Page X-5 for more information
** Reference at 300 SSU set point.
®
Dimensions
U.L. Recognized —
File No. E31926
G-14
Electrical Connection, 1/2˝ NPT Conduit
Visit www.GemsSensors.com for most current information.
4
2
1
3
0
0.1 0.5 1.0 1.5
5
FLOW RATE - GPM
PRESSURE DROP (PSID)
Part No. 51598
Part No. 51590
Part No. 51582
Tests conducted with units in vertical position (lead wires up) with water at
+70°F (21°C).
PISTON TYPE
How To Order – Standard Models
Specify Part Number based on flow setting.
Flow Setting
GPM, ±10%
0.10
0.25
0.50
0.75
1.00
Notes:
1. Flow settings are calibrated in a vertical position (lead wires up) with 300 SSU oil. Set points will
be maintained within 20% of settings in a liquid viscosity range of 40 to 1,000 SSU.
2. Use of 50 micron filtration is recommended.
– Stock Items.
Part
Numbers
51582
51586
51590
51594
51598
Pressure Drop – Typical
Visit www.GemsSensors.com for most current information.
FLOW SWITCHES
G-15
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