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PLACEHOLDER ONLY

INTRODUCTION

Flow Switches

Contents

Page Start

 Piston
 Shuttle
 Paddle

Piston Type................................................................ G-2

Unique Designs . . . For Use in Liquids or Gases

Paddle Type ............................................................ G-23

Shuttle Type ............................................................ G-16

GEMS’ line of flow switches features a broad range of configurations for
use in liquids or gases. At preset rates, ranging from 50 cc/min. to
100 GPM, GEMS switches will initiate alarm actuation or automatic
shut-down of a system.

Piston Types

These switches feature high quality, corrosion-resistant materials for
use in the toughest environments. Material choices, ranging from
stainless steel to Ryton®, offer vast chemical compatibility. Versions
include switches with fixed or adjustable actuation settings, models for
viscosity compensation or high pressures, in-line models and designs
to satisfy any mounting or space requirement.

Variety of Operating Principles
The versatile GEMS Flow Switch line utilizes four basic operating
principles. This catalog is organized into four operational types: Piston,
Shuttle, Paddle and Electronic. The Shuttle models are for use with high
flow rates; the Piston types are designed for low flow rates; the Paddle
for large line sizes and the Electronic switches encompass state-of-theart electronics and positive visual indication.

Shuttle Types

Flow Rate Selection Guide
Water

Air

Switch
Series

50 cc to 300 cc/min.

2 to 50 SCFH

FS-926

0.1 to 1.0 GPM (oil)



FS-930

0.1 to 1.5 GPM



FS-4

0.1 to 1.5 GPM

0.5 to 25.0 SCFM

Body
Materials

FLOW SWITCHES

Set Point

Alloys
Engineered Plastics

FS-925

0.1 to 1.5 GPM



FS-927

0.15 to 2.0 GPM



FS-380

0.25 to 2.0 GPM



FS-380P

Alloys
Engineered Plastics

0.1 to 60 GPM



RFS-2500 Rotorflow

Eng. Plastics & Alloys

0.5 to 3.0 GPM



FS-480

Alloys

0.5 to 5.0 GPM



FS-150

0.5 or 2 GPM



FS-400P

1

0.25 to 5.0 GPM



FS-500

0.5 to 20.0 GPM

1.0 to 160.0 SCFM

FS-10798

0.5 to 100 GPM



FS-200

0.75 to 10.0 GPM



FS-400

0.75 to 14.0 GPM



FS-400 Adjustable

1.0 to 15.0 GPM



FS-200 Adjustable

Dependent on Pipe Size
and Paddle Length



FS-550 Series

Paddle Types

Engineered Plastics

Alloys

Note:
1. See Section E.

Visit www.GemsSensors.com for most current information.

G-1

Piston Type Switches – For Low Flow
Rates in Liquids and Gases
 Models for liquid flow rates as low as 50 cc/min. and gas flow rates
as low as 2 SCFH
 Small, compact housings with port sizes from 1/4˝ NPT
 Precision built for superior accuracy

Typical Applications
Protect your expensive electronic equipment from coolant flow failure on...
• Laser Heads • Welders • Power Supplies • High Speed Spindles • X-Ray Tubes
• Semiconductor Equipment
Assure proper lubrication flow to critical bearings or gears to prevent system
downtime on...
• Presses • Rotating Equipment • Conveyors • Machine Tools • Robotics
Ensure system integrity in processing and dispensing equipment on...
• Water Purifications and Filtering • X-Ray film Processing
• Beverage dispensing • Chemical additives • Gas sampling • Distilling

Design Data
General Operating Principles

Low-Flow Switches
Partial Cutaway
(FS-926)

24" (609.6 mm)
WIRE LEADS
NO. 18 AWG

O-RING

MAGNET CARRIER
PISTON

O-RING

POLYSULFONE
HOUSING
SPRING
PERMANENT
MAGNET

FLOW SWITCHES

BY-PASS
HOLES
METERING
ORIFICE
LOW-FLOW
PISTON

HERMATICALLY
SEALED SWITCH
PISTON
HOUSING
9/16" -18 UNF-2B
BOTH PORTS

O-RING
INLET
FITTING

(FS-4 and FS-925
Series shown)

A piston, encapsulating a permanent magnet, is
positioned in the flow path within the unit housing. When
displaced by the pressure differential from fluid flow, this
piston magnetically actuates a hermetically sealed reed
switch (SPST or SPDT, depending on the series) within
the unit. The piston metering land diameter precisely
sets the actuation point by regulating bypass clearance.
A stainless steel spring provides positive piston return as
flow decreases. The reed switch, when actuated, can be
used to operate remote alarms or indicators. Or, it may be
integrated into automatic system controls.

G-2

An additional, lap-fitting piston is used in GEMS FS-926
Series to accurately detect low-flow rates. Calibration
is determined by one or more metering holes in the top
of the low-flow piston, which regulates bypass flow,
and therefore the actuation setting. When metered
bypass flow is exceeded, the resultant pressure
differential displaces the low-flow piston, moving the
magnet carrier piston to actuate the reed switch. Two
large bypass holes in the piston skirt are exposed after
actuation to maintain low pressure drop.

Externally Adjustable Switches

W

H-FLO

SWITC

MAX

IN

The
OUT
MIN
FS-10798
Series offers
FLOW ACTUATION
infinite flow
ADJUSTMENT
settings
from 0.5 to 20 GPM. Versions suitable for gas flow
monitoring are also available.

Visit www.GemsSensors.com for most current information.

P/N
MFRS.
S/N
MFRS.

TYPE NO.
NO.
CONTR.
NO.
STOCK
SPEC.

PISTON TYPE
Viscosity Compensating Switches

Contents

Page Start

FS-4 Series
Molded Plastic Construction ..................... G-4

O-RING

FS-150 Series
Straight-Through Flow Path,
Ryton Material ................................................... G-5

Partial Cutaway
(FS-930 Series)
VISCOSITY
COMPENSATING PISTON

FS-380 Series
High Pressure Inline ....................................... G-6

When temperatures of viscous fluids change, so do their flow properties. With
viscosity lowered by increasing temperature, a greater flow is generally required to
create actuation pressure differential. A unique patented piston within GEMS FS-930
Series switches accommodates these changes in fluid viscosity while maintaining
accurate switch actuation. Units can detect flow rates with 20% accuracy for liquid
viscosities between 40 to 1000 SSU.

FS-380P Series
Inline – Plastic Flow ........................................ G-7
FS-480 Series
Low Pressure Drop.......................................... G-8

Low Pressure Drop Switches

FS-927 Series
Miniature Brass Switches ............................ G-9
ENCAPSULATED
REED SWITCH

FS-925 Series
General Purpose ............................................. G-10

OVER-MOLDED PISTON
WITH MAGNET

FS-10798 Series
Externally Adjustable .................................. G-12

METERING DISC

O-RING

FLOW SWITCHES

SPRING

FS-926 Series
Low Flow ............................................................ G-10

FS-930 Series
Viscosity Compensating............................. G-14

The key to the excellent flow qualities of the FS-150 and FS-380 Series switches
is the dual diameter internal bore. At flow rates below the actuation point, the fluid
passes around the piston and metering disc within the “metering bore.” As fluid flow
increases past the actuation point, the metering disc enters the “flow bypass bore”
where the increased diameter provides generous flow paths. The result is a low
pressure drop for high flow rates and less susceptibility to fouling.

Typical Piston and Spring Removal
PISTON
PISTON

SPRING

INLET
FITTING

PLUG

O-RING

SPRING

Accumulation of foreign debris should periodically be removed from these switches.
GEMS’ designs provide for easy piston and spring removal for this occasional
cleaning. Recommended cleaning procedures are provided in the Instruction Bulletin
shipped with each unit. 150 micron filtration is recommended for the FS-150 Series;
100 micron for FS-380, 50 micron filtration is recommended for all other piston type
switches.
NOTE: All air/gas Flow Switches are factory calibrated using a special piston. Water calibrated units are not
recommended for air/gas applications.

Visit www.GemsSensors.com for most current information.

G-3

FS-4 Series –
Low Cost, Molded Plastic Construction
Flow Rate Settings: 0.1 GPM to 1.5 GPM
Port Size: 9/16˝-18 UNF
Primary Construction Material: Ryton®
Setting Type: Fixed
The FS-4 Series makes flow protection economical for a broad range of industrial
applications such as welders, lubrication systems, medical sterilizers and laundry
chemicals dispensing.

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

Specifications
Wetted Materials
Housing and Piston

Ryton® R4

Spring

316 Stainless Steel

O-Ring

Viton®

Other Wetted Parts

Epoxy

Dimensions
1.90
48

Operating Pressure, Maximum

250 PSIG (17.2 bar) @ 70°F (21°C)

Operating Temperature

0°F to 225°F (-17°C to +107°C)

Set Point Accuracy

±15% Maximum

Set Point Differential

20% Maximum

Switch*

SPST or SPDT, 20 VA (SPDT: 240 V
VAC Max.)

Inlet/Outlet Ports

9/16˝ -18 UNF-2B Thread

Recommended Filtration
Electrical Termination
SPST

50 Microns or Better

.920 DIA
23
.586
15

1.00
25

LEADWIRES

18 AWG, Zipcord, 24˝ Long

SPDT

3.80
97

18 AWG, PVC 24˝ Long Leads

3.640
92
1.255
32

How To Order – Standard Models
Housing
and Piston
Material

Ryton

®

Flow
Setting
GPM

Part Numbers
SPST Switch
N.O., No Flow

N.C., No Flow

With
SPDT Switch

0.1

122340

122346

122352

0.25

122341

122347

122353

0.5

122342

122348

122354

0.75

122343

122349

122355

1.0

122344

122350

122356

1.5

122345

122351

122357

Note:
Flow settings are calibrated using water @ +70°F on increasing flow, with units in a vertical position
(lead wires up).

inch
mm

9/16˝ -18 UNF-2B THREAD
WITH O RING SEAL PORT

Pressure Drop – Typical
3.0

PRESSURE DROP (PSID)

FLOW SWITCHES

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

2.5
Part No. 122355

2.0

Part No. 122357

1.5

Part No. 122352

1.0
0.5
0

0

0.5

1.0

1.5

2.0

FLOW RATE - GPM
Tests conducted with units in vertical position (lead wires up) with water
at +70 F (21 C).

Port Adapters for FS-4
Converts 9/16˝ threaded ports to NPT or barbed connection. Made of Ryton®-R4 or
polypropylene with O-Rings in place.
CAUTION: Do not exceed 15 in./lbs. maximum torque when installing adapter fittings.
Material
Ryton®
Polypropylene

G-4

Adapter Size

Part Numbers

1/8˝ NPT*

123028

1/4˝ NPT*

123029

1/4˝ NPT*

158602

1/2˝ Barb**

158603

*Wrench flats provide for proper
assembly.
**Accepts 1/2˝ I.D. flexible hose
– Stock Items.

1/2" (12.7 mm) .54" (13.7 mm)
DIA.
DIA.
3/4" (19.0 mm)
HEX
.25"
(6.3 mm)

1/2" Barb
1"
(25.4 mm)

1/4" NPT

1/8" NPT
3/4" (19.0 mm) DIA.
.62 FLAT
3/8" (9.5 mm)
1/2" (12.7 mm)

Visit www.GemsSensors.com for most current information.

1" (25.4 mm)
DIA.
.87 FLAT
1/2"
(12.7 mm)

5/8"
(15.9 mm)

PISTON TYPE

FS-150 Series – Straight Flow Path with
Low Pressure Drop
Flow Rate Settings: Liquids: 0.5 GPM to 5 GPM
Port Size: 1/2˝ NPT
Primary Construction Material: Polypropylene
Setting Type: Fixed
These slim, inline switches reduce pressure drop to a minimum. They incorporate
a unique, dual-diameter, internal bore and piston configuration to minimize flow
constriction. Liquids are able to smoothly pass around the piston and flow through
the switch with little pressure loss to the down stream line.

Specifications
Polypropylene, Hydrolytically Stable, Glass Reinforced

Piston

Ryton® -R4, 316 Stainless Steel

O-Ring

Viton®

Spring

316 Stainless Steel

Dimensions

Operating Pressure, Maximum

200 PSIG (13.8 bar)
@+70°F to +150°F (+21.1°C to 65.5°C)
150 PSIG (10.3 bar)
@+150°F to +212°F (+65.5°C to +100°C)

Operating Temperature

0°F to 212°F (-17.8°C to +100°C)

Set Point Accuracy

±15%

Set Point Differential

20% Maximum

Switch*

SPST, 20 VA

Inlet/Outlet Ports

1/2˝ NPT Male

Electrical Termination

1/4˝ Male Quick Connect Terminals (2)

1-1/16"
(26.9 mm)
HEX
1/2" NPT
1/4" (6.3 mm)
QUICK CONNECT
TERMINALS

7/8"
(22.2 mm)
DIA. REF.
5-29/32"
(139.7 mm)
REF.

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

How To Order – Standard Models

1/2" NPT

Specify Part Number based on flow setting and switch operation.

2-5/32"
(54.8 mm) REF.

Part Numbers

Flow Settings
GPM

Normally Open @ No Flow

Normally Closed @ No Flow

0.5

129660

129666

1.0

129661

129667

2.0

129662

129668

3.0

129663

129669

4.0

129664

129670

5.0

129665

129671

1-13/64"
(30.5 mm) REF.

1-5/16"
(33.3 mm)
HEX

Note: Cable output available. Please consult factory.

Pressure Drop - Typical
5

PRESSURE DROP (PSID)

Notes:
1. Flow settings are calibrated using water @ +70°F on increasing flow, with units in a horizontal position
(terminals up).
2. Care should be taken by specifiers to ensure fluid compatibility with the above listed wetted materials.
3. Use of 150 micron filtration is recommended.
– Stock Items.

1-3/8"
(34.9 mm) REF.

FLOW SWITCHES

Wetted Materials
Housing

Patent #
4.996.396

U.L. RECOGNIZED —
FILE NO. E31926
CSA Listed —
File No. LR30200

4
Part No.
129663

3

Part No.
129664

2

Part No.
129665
Part No. 129660
Part No. 129661
Part No. 129662

1
0

3
4
5
6
7
FLOW RATE - GPM
Tests conducted with units in a horizontal position with water at +70°F (21°C).
Data will vary slightly for vertically mounted units.
0

Visit www.GemsSensors.com for most current information.

1

2

G-5

FS-380 Series – Compact Flow Switch
for High Inline Pressures
Flow Rate Settings: 0.15 GPM to 2.00 GPM
Port Size: 3/8˝ NPT Male
Primary Construction Material: Brass or Stainless Steel
Setting Type: Fixed
These rugged inline flow switches use 100 micron filtration and are less susceptible
to clogging than other high-pressure inline flow switches. The one-piece magnetic
PPS composite piston makes the FS-380 ideal for high-pressure applications such
as industrial cleaning equipment. The FS-380 is also an excellent choice for semicon
cooling applications where simple design and reliable operation are required.

Specifications

U.L. Recognized
File No. E31926

Dimensions

Wetted Materials
Housing

Brass or 316 Stainless Steel

Piston

PPS Composite, Epoxy

Spring

316 Stainless Steel

O-Ring

Fluorocarbon

1/2˝ NPT Ports

Operating Pressure, Maximum

1500 PSI (107 bar)

Operating Temperature

-20°F to +275°F (-28.8°C to +135°C)

Set Point Accuracy

±20% Maximum

Set Point Differential

20% Maximum

Switch*

SPST, 20VA, N.O. at no Flow

Electrical Termination

No. 22 AWG, 24˝ to 26˝ Polymeric leads

1.25˝
(32 mm)

Gems FS-380

FLOW

7/8˝ -HEX
4.0˝
(102 mm)

3/8˝ NPT Ports

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

Gems FS-380

To prevent sensor to sensor magnetic field interference, follow the spacing
guidelines below.
1 1/4˝
2 3/8˝

1.00˝
(25 mm)

FLOW

3/4˝ -HEX

1 1/2˝

0.85˝
(22 mm)

3.45˝
(88 mm)

2 13/64˝
FLOW

Gems FS-380

FLOW

Gems FS-380

FLOW

Gems FS-380

FLOW SWITCHES

Spacing

3/8˝ Tube End Compression Fitting

FLOW

Gems FS-380

NOTE SWITCH
ORIENTATION
1.13˝
(29 mm)

FLOW

11/16˝ -HEX
4.02˝
(102 mm)

How To Order – Standard Models
Specify Part Number based on flow settings.
3/8˝ NPT Male

3/8˝ Tube Compression Fitting 1/2˝ NPT Male

Stainless Steel

Stainless Steel

Brass

14

0.15

181130

193482

212136



12

0.25

168432

179992

177592

192562

10

0.50

168433

179993

177593

192563

1.00

168434

179994

177594

192564

1.50

168435

179995

177595

192566

2.00

178353

179996

225525

192567

PSI DROP

Brass

8
6

SPRING 170342 4
1.5 + 2.0 GPM
2
SETTINGS
0

Note:
1. Flow settings are calibrated using water @ 70°F on increasing flow with units in horizontal position.
Consult factory for other fluid compatibility.

G-6

Pressure Drop – Typical

Flow Settings
GPM1

– Stock Items.

0.86˝
(22 mm)

0
1
SPRING 10397
0.25 - 1.00 GPM
SETTINGS

Visit www.GemsSensors.com for most current information.

2

3

4

FLOW RATE - GPM

5

6

7

PISTON TYPE

FS-380P Series – Industrial Strength
Inline Plastic Flow Switch
Flow Rate Settings: 0.25 GPM to 2.00 GPM
Port Size: 3/8˝ NPT Male and 1/4˝ Quick Disconnect (QDC) Male
Primary Construction Material: Polypropylene
Setting Type: Fixed
This rugged inline flow switch offers the same superior performance to
non-clogging as its metal cousin (FS-380). The fixed set point and simple design
make it a dependable switch. The FS-380P is an ideal choice for coolant applications
requiring reliable flow detection in HVAC, semiconductor, welding, medical and
other industries. 1/4˝ quick disconnect units have a host of snap-on mating
adapters to fit most piping requirements.

Specifications

See table at bottom right for adapter Part Numbers.

Glass Reinforced Polypropylene
PPS Composite

Spring

316 Stainless Steel

O-Ring

Fluorocarbon

1.00˝
1.00˝
(25 mm)
(25 mm)

Operating Pressure

125 PSI (8.6 bar) @ 70°F (21°C),
50 PSI (3.4 bar) @ 212°F (100°C)

Operating Temperature

0°F to 212°F (-18°C to +100°C)

Set Point Accuracy

20% of Set Point

Set Point Differential

20% Maximum

Switch*

SPST, 10VA, N.O. at no Flow

Electrical Termination

24˝ to 26˝ Polymeric Leads, 22 AWG

Filtration

100 Micron

Approvals

CUL

4.22˝
(107 4.22˝
mm)
(107 mm)

0.75˝
0.75˝
(19 mm)
(19FLATS
mm)
ACROSS
ACROSS FLATS
0.43˝
0.43˝
(11 mm)
(11 mm)
DIA. TYPICAL
DIA. TYPICAL

11/16˝ HEX
11/16˝ HEX

1.00˝
1.00˝
(25 mm)
(25 mm)

FLOW
FLOW

0.75˝
0.75˝
(19 mm)
(19FLATS
mm)
ACROSS
ACROSS FLATS

How To Order
Specify Part Number based on flow settings. Adapters
for the 1/4˝ Quick Disconnect (QDC) Male unit are listed
in the table at right.
Part Numbers
216445**

216446**

0.15

209876

203206

0.25

197081

197091

0.50

197082

197092

1.00

197083

197093

1.50

197084

197094

2.00

197085

197095

4.00˝
(102 4.00˝
mm)
(102 mm)

Acetal Adapters for 1/4˝ Quick Disconnect
Male Tube Fitting Units (180°F max.)
These adapters are available with or without an integral
shut-off valve. The shut-off valve will stop line flow
when the adapter is removed from the unit. Flow
resumes when connected.
Typical shown: 1/4˝ NPT Male
Pipe Thread with Shut-off Valve

1/4˝ QDC Male*

0.07

* See selection of adapters at right.
QDC = Quick Disconnect
** Set point accuracy 0.06 to 0.1 GPM

FLOW
FLOW

3/8˝ NPT Port

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

3/8˝ NPT Male

11/16˝ HEX
11/16˝ HEX

FLOW SWITCHES

Piston

– Stock Items.

Dimensions
1/4˝ Quick Disconnect Male Adapter

Wetted Materials
Housing

Flow Settings
GPM

File No. E31926

Description
1/4˝ NPT Male Pipe Thread

Part Numbers
Straight Through with Shut-Off Valve
195787

198063

1/4˝ BSPT Male Pipe Thread

198064

195788

3/8˝ NPT Male Pipe Thread

198065

198066

3/8˝ BSPT Male Pipe Thread

198067

198068

1/4˝ O.D., .27˝ I.D. (6 mm O.D., 4.3 mm I.D.) Polytube

198096

198097

3/8˝ O.D., 1/4˝ I.D. (9.5 mm O.D., 6 mm I.D.) Polytube

198099

198098

1/4˝ (6.4 mm) I.D. Barb

198401

198402

5/16˝ (7.9 mm) I.D. Barb

198403

198404

3/8˝ (9.5 mm) I.D. Barb

198408

198405

1/4˝ O.D. (6.4 mm) O.D. JG®

198470

198406

3/8˝ O.D. (9.5 mm) O.D. JG®

198459

198407

JG® is a registered trademark of John Guest USA, Inc.

Visit www.GemsSensors.com for most current information.

G-7

FS-480 Series – Stainless Steel Flow
Switch for Large Flow, Low Pressure Drop
Flow Rate Settings: 0.50 GPM to 3.00 GPM
Port Size: 1/2˝ NPT, 3/4˝ NPT, 1/2˝ Tube Compression Fitting
Primary Construction Material: 316 Stainless Steel
Setting Type: Fixed
The FS-480 large-body inline flow switch delivers ample flow rates with minimal
pressure drop. 25% larger than its FS-380 sibling, the FS-480 is ideal for processes
that push more fluid through their systems and demand low pressure drops. Designed
to accommodate the Semiconductor Industry’s move to larger 300 mm wafer and
cross-over equipment, this switch is also perfect for critical medical equipment
applications. A glass-reinforced PPS piston and forged 316 stainless steel body make
this sensor rugged enough for high pressure lubrication and cooling systems as
well. This simple, yet meticulously perfected design provides the reliability required
in critical applications while allowing for much lower pressure drop rates than other
available switches.

File No. E31926

Specifications
SWITCH ASSY.

Wetted Materials
Housing/End Fitting

FLOW BODY

316 Stainless Steel

Piston

PPS, Epoxy

Spring

316 Stainless Steel

O-Ring

Fluorocarbon

Operating Temperature

-20°F to +250°F (-28.8°C to +121°C)

Set Point Accuracy

±20% Maximum

Set Point Differential

20% Maximum

Dimensions

Recommended Filtration

100 Micron or better

1/2˝ NPT Ports

Switch*

SPST, 20VA, 120/240 VAC, N.O. at no Flow

Electrical Termination

No. 22 AWG, 24˝ PVC Cable

Straight design and large bore body minimizes pressure drop.

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

1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
1.50˝
1.50˝
1.50˝
REFREF
REF
38 38
38

Pressure Drop – Typical 1.0 GPM Set Point

PSID

FLOW SWITCHES

1000 PSI (69 bar)

15.00
14.00
13.00
12.00
11.00
10.00
9.00
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
0.0

1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4

4.94˝
4.94˝
4.94˝
REFREF
REF
125125
125

3/4˝ NPT Ports
1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
1.50˝
1.50˝
1.50˝
REFREF
REF
38 38
38
1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

9.0

10.0

11.0

12.0

13.0

FLOW RATE IN GPM

1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4

4.95˝
4.95˝
4.95˝
REFREF
REF
125125
125

1/2˝ Tube End Compression Fitting

How To Order – Standard Models

1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4

Specify Part Number based on flow settings.
Flow Settings*
GPM

1/2˝ NPT Port

3/4˝ NPT Port

1/2˝ Tube
Compression Fitting

0.50

206915

204715

204710

1.00

206916

204716

204711

1.50

206917

204717

204712

2.00

206918

204718

204713

3.00

206919

204719

204714

1/2˝1/2˝
TUBE
END
1/2˝
TUBE
TUBE
END
END
COMPRESSION
COMPRESSION
COMPRESSION
FITTING
FITTING
FITTING

1.50˝
1.50˝
1.50˝
REFREF
REF
38 38
38

1.00˝
1.00˝
1.00˝
REFREF
REF
25.4
25.4
25.4
7/8˝7/8˝
HEXHEX
7/8˝
HEX

*Calibrated with unit in horizontal position.

G-8

SPRING

PISTON ASSY.

Operating Pressure, Maximum

Visit www.GemsSensors.com for most current information.

7/8˝7/8˝
HEXHEX
7/8˝
HEX
5.40˝
5.40˝
5.40˝
REFREF
REF
137137
137


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