Georg Fischer 2540 Specifications

Signet 2540 Stainless Steel High Performance
Paddlewheel Flow Sensor

Features

• Operating range 0.1 to 6 m/s (0.3 to 20 ft/s)

Standard Sensor

The Signet 2540 Paddlewheel Flow Sensor offers
the strength and corrosion resistance of stainless
steel for liquid applications with low velocity
measurements. Unique internal circuitry eliminates
the need for magnets in the process fluid, enabling
flow measurement of 0.1 to 6 m/s (0.3 to 20 ft/s) while
maintaining the advantages of insertion sensor design.
Ultraflon 500C bearings and Tungsten Carbide pin
provide exceptional wear resistance.

The Signet 2540 offers field replaceable electronics and
transient voltage suppression (TVS) to provide greater
immunity to large voltage disturbances (i.e. lightning)
sometimes encountered in field wiring. Sensors can
be installed in DN40 to DN600 (1½ to 24 inch) pipes
using the 1½ inch or ISO 7/1-R 1.5 threaded process
connection.

Hot-Tap Sensor

• Field

• Non-magnetic RF detection

• Standard NPT or ISO process connections

• Hot-tap versions for installation/service without
system shutdown

• For pipe sizes up to DN900 (36 in.)

• Adjustable sensor - one size for entire
pipe range

• 7.6 m (25 ft) cable

replaceable electronics

Applications

• HVAC

• Turf Irrigation

• Cooling Systems

• Filtration Systems

• Water Distribution

• Leak Detection

• Pump Protection

• Clarified Effluent Totalization

• Ground Water Remediation

• Gravity Feed Line

The sensors are also offered in a hot-tap configuration
with a bleed valve service without process shutdown in
pipes up to DN900 (36 in.). Both styles of sensors must
be used in full pipes and can be used in low pressure
systems.

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Specifications

General

Operating Range 0.1 to 6 m/s 0.3 to 20 ft/s
Pipe Size Range Standard Version DN40 to DN600 1½ to 24 in.

Hot-Tap Version DN40 to DN900 1½ to 36 in.
Sensor Fitting Options 1½ in. NPT threads ISO 7/1-R 1.5 threads

Linearity ±1% of full range

Repeatability ±0.5% of full range

Min. Reynolds Number Required 4500

Wetted Materials

Body 316 stainless steel (1.4401)
Fitting 316 stainless steel (1.4401)
Fitting O-rings FPM, optional EPR (EPDM)
Rotor 17-4 SS Alloy
Rotor Pin Tungsten Carbide GRP 1 (standard) stainless steel (optional)
Retainers (2) 316 stainless steel (1.4401)
Rotor Bearings (2) Carbon fiber reinforced PTFE

Electrical

Frequency 15 Hz per ft/s nominal
Power 5 to 24 VDC ±10%, regulated, 1.5 mA max.

Output Type Open collector, sinking, max 10.0 mA
Cable Length 7.6 m (25 ft), can be extended up to 300 m (1,000 ft)
Cable Type 2-conductor twisted-pair with shield, 22 AWG

Max. Temperature/Pressure Rating

Sensor with standard FPM
sensor fitting O-rings

Sensor with optional EPR (EPDM)
sensor fitting O-rings

Operating Temperature -18 °C to 100 °C 0 °F to 212 °F

Shipping Weight

Standards and Approvals

17 bar @ 82 °C 250 psi @ 180 °F

17 bar @ 100 °C 250 psi @ 212 °F

3-2540-1/-2/-1S/-2S 1.79 kg 3.9 lb

3-2540-3/-4/-3S/-4S 2.15 kg 4.7 lb

CE, FCC

RoHS compliant, China RoHS

Manufactured under ISO 9001 for Quality and ISO 14001 for Environmental Management

and OHSAS 18001 for Occupational Health and Safety

Dimensions

64 mm (2½ in.) dia.

2540 High Performance
Flow Sensor for 1½ to 24 in. pipes

See Temperature and Pressure graphs for more information.

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7.6 m (25 ft)
integral cable

Adjustable

length

190.5 mm
(7.5 in.)

O-ring
seal (1)

127 mm

(5.0 in.)

Sensor fitting:
1½ in. NPT or
ISO 7/1-R 1.5
thread

24 mm (0.94 in.) dia.

2540 Hot-Tap for
1½ to 36 in. pipes

Adjustable

Length

457.2 mm
(18”)

64 mm (2½ in.) dia.

7.6 m
(25 ft)
cable

457 mm

(18 in.)

Bleed
valve

Sensor fitting:
1½ in. NPT or
ISO 7/1-R 1.5

thread
O-ring
seals (2)

24 mm (0.94 in.) dia.

Panel Mount

Signet Instruments
8550 9900
8900 9900-1BC

Field Mount - Pipe, Tank, Wall

Signet Instruments
8550 9900
with 3-8050 Universal Mount Kit

ENTER

Signet 2540 Standard or
Hot-tap (not shown)
Flow Sensor

System Overview

Fittings ­Customer supplied

Application Tips

• For systems with components of more than one
material, the maximum temperature/pressure
specification must always be referenced to the
component with the lowest rating.

ENTER

+

All sold separately

• Use the Conduit Adapter Kit to protect the cable­to-sensor connection when used in outdoor
environments.

• Sensor electronics can be easily replaced by

3-2541.260-1 or 3-2541.260-2.

Operating Temperature/Pressure Graphs

Note:

The pressure/temperature graphs are specifically
for the Signet sensor. During system design the
specifications of all components must be considered.
In the case of a metal piping system, a plastic sensor
will reduce the system specification. When using a
PVDF sensor in a PVC piping system, the fitting will
reduce the system specification.

Please refer to Wiring, Installation, and Accessories sections for more information.

(bar)(psi)

300 20.7

19.3

280

17.9

260

16.5

240

15.2

220

200 13.8

12.4

180

11.0

160

9.7

140

8.3

120

100 6.9

5.5

80

4.1

60

2.8

40

1.4

20

0

-20

°F°C-4 32 68 104

0

20

FPM O-ring

EPDM O-ring

40

60

140

176

80

100

120

212

248

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Ordering Information

Mfr. Part No. Code Mounting Option Rotor Pin Material

Stainless Steel High Performance flow sensor with removable electronics
3-2540-1 198 840 035 1½ inch NPT thread Tungsten Carbide
3-2540-2 198 840 036 1½ inch ISO thread Tungsten Carbide
3-2540-3 198 840 037 1½ inch NPT thread, Hot-Tap design* Tungsten Carbide
3-2540-4 198 840 038 1½ inch ISO thread, Hot-Tap design* Tungsten Carbide
3-2540-1S 159 001 501 1½ inch NPT thread 316 Stainless Steel
3-2540-2S 159 001 502 1½ inch ISO thread 316 Stainless Steel
3-2540-3S 159 001 503 1½ inch NPT thread, Hot-Tap design* 316 Stainless Steel
3-2540-4S 159 001 504 1½ inch ISO thread, Hot-Tap design* 316 Stainless Steel

*Must use 3-1500.663 Hot-Tap installation tool (ordered separately)

Ordering Notes

Installation fittings and Hot-Tap valves are
customer supplied.

Accessories and Replacement Parts

Mfr. Part No. Code Description

3-1500.663 198 820 008 Hot-Tap Installation Tool (see Installation for more info)
1220-0021 198 801 186 O-ring, FPM (2 required per sensor)
1224-0021 198 820 006 O-ring, EPR (EPDM) (2 required per sensor)
1228-0021 198 820 007 O-ring, FFPM (2 required per sensor)
3-2540.320 198 820 040 Rotor kit, 2540 PEEK Bearing (old version)
3-2540.321 159 000 623 Rotor kit, 2540 Tungsten Carbide Pin (new version since January 1, 2000)
3-2540.322 159 000 864 Rotor kit, stainless steel pin and rotor
P52504-3 159 000 866 Rotor pin, Tungsten Carbide
P52504-4 159 000 867 Rotor pin, 316 SS
P52503 198 820 013 Bearing, carbon reinforced PTFE
P52527 159 000 481 Retainers, SS (1.4401)
3-2541.260-1 159 000 849 Standard replacement electronics module
3-2541.260-2 159 000 850 Hot-Tap replacement electronics module
5523-0222 159 000 392 Cable (per foot), 2 cond. w/shield, 22 AWG
P51589 159 000 476 Conduit adapter kit
P31934 159 000 466 Conduit cap

3-2540.099 Rev C (4/13)

© Georg Fischer Signet LLC
3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. [phone] • Fax [phone] • www.gfsignet.com • e-mail: [e-mail]
Specifications subject to change without notice. All rights reserved. All corporate names and trademarks stated herein are the property of their respective companies.

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