Gems Sensors & Controls FS-10798 Specifications

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FS-10798 Series – Externally Adjustable for

FLOW SWITCHES

Water, Oils and Gases

Flow Rate Settings: Liquids: Infinite Adjustment between 0.5 GPM and

20.0 GPM

Air/Gases: See Gas Flow Adjustment Ranges below

Port Size: 1/2˝ NPT
Primary Construction Material: Brass or Stainless Steel
Setting Type: Adjustable

These externally adjustable switches are ideal for protecting machine tools from
coolant flow failure, for protecting bearings from loss of lubricant or to assure proper
air flow. They offer an infinite number of flow settings at pressures up to 1000 PSIG,
with low pressure drop and precise repeatability.

The adjusting vane is easily field adjustable using an ordinary flat-bladed screwdriver.
The adjustment is set-screw-locked for tamper-free operation after field calibration.

Specifications

Wetted Materials
Housing Brass or 316 Stainless Steel

Piston
In Brass Housing Polysulfone for water; Brass for oil or air

In Stainless Steel Housing 316 Stainless Steel Only

Spring 316 Stainless Steel

O-Ring Viton

Other Wetted Parts Epoxy

Pressure Rating
Operating 1000 PSIG (69 bar)

Proof 2500 PSIG (172 bar)

Burst 5000 PSIG (345 bar)

Operating Temperature
With Brass or S.S. Piston -20°F to +300°F (-29°C to +148.9°C)

With Polysulfone Piston -20°F to +225°F (-29°C to +107.2°C)

Repeatability 1% Maximum Deviation

Set Point Accuracy ±10% Maximum

Set Point Differential 15% Maximum

Switch* SPDT, 20 VA

Inlet/Outlet Ports 1/2˝ NPT

Electrical Termination No. 18 AWG, 24˝ L., Polymeric Lead Wires

*See “Electrical Data” on Page X-5 for more information.

®

UL Approved

Explosion-Proof

Shown with optional 1/2”
conduit connector.

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G

E

o HS

M

S

C

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Dimensions

With Wire Leads and Strain Relief

FLOW ACTUATION ADJUSTMENT

3/4"

(19.0 mm)

SWITCH-FLOW

MFRS. P/N

MFRS. S/N

TYPE NO.

OUT

CONTR. NO.

STOCK NO.

5/8"

(15.8 mm)

1-1/4"

(31.7 mm)

With 1/2˝ NPT Conduit Connector

1-1/16"

(26.9 mm)

MAX.

IN

SPEC.

1/2"

(12.7 mm)

4-1/8"

(104.7 mm)

1/2" NPT BOTH PORTS

U.L. Recognized — File
No. E31926
CSA Listed —
File No. LR30200

MAX

MIN

IN

2"

(50.8 mm)

Air/Gas Flow Adjustment Ranges

Water or oil flow units should not be utilized for air/gas applications. The FS-10798
Gas Flow configuration utilizes a special dash-pot piston for reliability. The flow
adjustment ranges are typical for air service. For other gases, the flow range will vary
with the density of the gas. Please consult factory for more information.

For 5 PSIG Line* 1 to 75 SCFM Approx.
For 100 PSIG Line 3 to 160 SCFM Approx.

* Minimum 5 PSI line pressure required.

G-14

Visit www.GemsSensors.com for most current information.

FS-10798 Series / p1of2 / 30-JUL-14

PISTON TYPE

How It Works

HERMETICALLY SEALED
SPDT SWITCH

SPRING

HOUSING

VALVE ADJUSTMENT
LOCKING SET SCREW

MAGNETIC SWITCH

PISTON

ADJUSTMENT

An externally rotatable vane is positioned in the main flow path within the unit. The
magnet carrier piston is located in a bypass flow chamber. Pressure differential,
caused by flow around the adjusting vane, displaces the spring-biased piston which
actuates a hermetically sealed SPDT reed switch within the unit.

PERMANENT MAGNET

PISTON

FLOW ADJUSTMENT
VANE

Flow diagram with switch
shown actuated.

Pressure Drop - Typical

0.5 GPM

2.5

2.0

1.5
Part No. 25357

1.0

0.5

PRESSURE DROP (PSID)

0

0 0.5 1.0 2.0

10 GPM and 20 GPM

16

12

8

4

PRESSURE DROP (PSID)

0

0 5 10 15 20 25 30

Tests conducted with units in horizontal position with water at +70°F (21°C).
Data will vary slightly for vertically mounted units.

FLOW RATE - GPM

Part No. 25358

FLOW RATE - GPM

How To Order – Standard Models

Specify Part Number based on desired media, piston material and electrical termination.

Media

Materials

Housing Piston

Brass (for Oils)

Polysulfone (for Water)

Liquids

Brass

316 Stainless Steel

Gases

Notes:

1. Temperature changes will slightly affect the standard water or gas flow settings listed.
Oil flow settings will vary with temperature and viscosity.

2. Use of 50 micron filtration is recommended.

– Stock Items.

Brass

316 Stainless Steel

Part Numbers

With Lead

Wires

With 1/2˝

Conduit

Connector

61205 49073

25357 25363

25358 25364

25359 25365

25360 25366

FS-10798 switches are U.L. Approved for Class I,
Division 2, Groups A, B, C, D hazardous locations.

U.L. Approved — File No. E183854

FLOW SWITCHES

Standard Wiring Color Code

Wire Color Terminal

Orange N.O.

Black Common

Red N.C.

FS-10798 Series / p2of2 / 30-JUL-14

Visit www.GemsSensors.com for most current information.

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