GF Signet 2540 SS Paddlewheel Flow Sensor

316 SS high-performance insertion paddlewheel with non-magnetic RF detection for 0.1…6 m/s, standard DN40…DN600 and hot-tap versions to DN900.

Key advantages

0.1…6 m/s — low-velocity measurement without magnets in the fluid.
Hot-tap option — install/service without shutdown; hot-tap to DN900 (36 in.).
Field-replaceable electronics — TVS protection; 7.6 m cable; open-collector frequency.
Wear-resistant wet end — tungsten-carbide shaft and CFR-PTFE bearings.

Typical applications

HVAC, irrigation, cooling, filtration, water distribution, pump protection.
Full-pipe liquid lines needing SS insertion hardware.

Selection guide

Pipe — Standard DN40…DN600; hot-tap DN40…DN900.
Accuracy — Linearity ±1% of full range; repeatability ±0.5% of full range; min Re 4500.
Connection — 1½ in. NPT or ISO 7/1-R 1.5.
Electrical — ~49 Hz per m/s; 5…24 VDC, 1.5 mA max; OC sinking 10 mA max; cable to 300 m.
P/T — 17 bar @ 82 °C (FKM) / 17 bar @ 100 °C (EPDM); operating −18…100 °C.
Approvals — CE, UKCA, FCC; RoHS.

Common mistakes

Ordering standard when hot-tap removal under pressure is required.
Using in partially filled pipe.
Ignoring Reynolds ≥4500 near 0.1 m/s.
Flow instruments · Flow buying guide

When to RFQ / what to tell us

Pipe size; hot-tap yes/no; NPT vs ISO.
Fluid, velocity, T/P; O-ring preference.
Host input; cable length; quantity; ship-to.

Request a Quote · Get selection help

Specs

Spec	Value
SKU	20198
Brand	Georg Fischer / GF Signet
Model	2540
Product type	stainless steel paddlewheel flow sensor
Measuring range	0.1 to 6 m/s; standard DN40–DN600; hot-tap DN40–DN900
Accuracy	Linearity ±1% of full range; repeatability ±0.5% of full range
Output signal	Open-collector frequency, sinking, max 10 mA
Supply voltage	5 to 24 VDC ±10%, 1.5 mA max
Process connection	1½ in. NPT or ISO 7/1-R 1.5
Wetted materials	316 SS body/fitting; 17-4PH rotor; tungsten carbide shaft; CFR-PTFE bearings; FKM/EPDM
Notes	Values aligned with GF datasheet 3-2540.099 Rev I 06/2026-A.

Documents

GF Signet 2540 datasheet (PDF)

FAQ

Q: Standard vs hot-tap? A: Hot-tap when live insertion/removal is required (to DN900). Standard covers DN40…DN600 threaded installs.

Q: Self-powered? A: No — needs 5…24 VDC and provides open-collector frequency.

Q: What should I send for a quote? A: Pipe size, hot-tap yes/no, fluid, velocity, T/P, connection, quantity. Compatible with systems using GF Signet 2540 if you need a drop-in check — we do not claim authorized-dealer status.