GF-S-CL Ultrasonic Flowmeter

Compact clamp-on water measurement — DN15–DN50

Applications and measurement

Transit-time ultrasonic measurement for small water pipes, with an integrated external clamp that installs without cutting the pipe or contacting the liquid.

Applications include liquid cooling, cleaning, liquid-crystal manufacturing, medical equipment and laboratories. Flow data can be combined with temperature data from other sensors and devices for thermal management of heat-generating equipment.

Liquid cooling application pictured in the GF-S-CL catalogue — Liquid cooling

Cleaning application pictured in the GF-S-CL catalogue — Cleaning

Liquid crystal application pictured in the GF-S-CL catalogue — Liquid crystal

Medical application pictured in the GF-S-CL catalogue — Medical

Laboratories application pictured in the GF-S-CL catalogue — Laboratories

About GF-S-CL

The all-in-one meter combines the transmitter and clamp-on transducer in a compact body. It fits stainless steel, copper, PVC and PPR pipes within the specified outside-diameter ranges.

Quick clip-on installation without interrupting the pipeline.
Permanent coupling pads and a reusable design for different pipe materials.
Display shows date, flow and velocity, with colour text for clear reading in dim light.
Colour LCD with a 360° rotatable display and three touch keys.
4–20 mA output and RS485 communication.
Factory configuration for the selected application industry.

GF-S-CL ultrasonic flowmeter on a pipe with separate lower clamp, on white background

Coupling and display features

Original GF-S-CL coupling pads, reusable clamp and display views

Permanent coupling pads — lower maintenance costs.
Reusable with different pipe materials — lower purchase costs.
Comprehensive display of date, flow and velocity, with colour text for clear reading in dim light.

Application and Installation Guidance

Select a sound section of pipe and clean its outside surface.
Apply the supplied coupling sticker to the centre of the sensor. Ensure close contact between sensor and pipe, with no air bubbles in the coupling layer.
Align the arrow on the instrument nameplate with the liquid flow direction.
Fit the upper and lower clamps around the pipe and tighten all four screws securely. Use the supplied rubber pads where required for a firm fit.
Power on and set the actual pipe outside diameter, wall thickness and pipe parameters in the Pipe Parameter Setting menu.

GF-S-CL four installation steps from the original catalogue

Class B pipe fit uses the supplied adhesive pads on both sides of the clamp’s inner wall. Class B is not listed for DN15.

The specified medium is water. Accuracy can vary with pipe type, liquid and temperature; the catalogue’s standard accuracy is measured on the manufacturer’s flow standard device.

Technical Data and Wiring

Measurement: Transit-time ultrasonic; integrated clamp-on transmitter and transducer
Medium: Water
Velocity range: 0.03–5.0 m/s
Accuracy: ±3% FS at 0.3–5 m/s
Communication: RS485; MODBUS protocol
Analogue output: 4–20 mA
Power supply: 10–36 VDC / 500 mA
Protection: IP54
Enclosure: PC (polycarbonate)
Pipe clamp: PC engineering plastic
Display: 1.54-inch colour LCD, 240 × 240 pixels; 360° rotatable
Controls: 3 touch keys
Transmitter temperature: −10 to +50°C
Transducer temperature: 0–60°C
Humidity: 0–99% relative humidity, non-condensing
Standard cable: 4 m, Ø5 mm black six-core shielded cable with self-locking connectors

Six-core cable connections

Original GF-S-CL wiring diagram with brown, black, green, white, red and yellow conductors

Colour	Identifier	Function
Brown	+	10–36 VDC power supply
Black	−	Power ground
Green	A	RS485+
White	B	RS485−
Red	I+	4–20 mA+
Yellow	I−	4–20 mA−

Pipe Sizes and Flow Ranges

Stainless steel and copper pipe bundles from the GF-S-CL catalogue — Stainless steel and copper

PVC and PPR pipe bundles from the GF-S-CL catalogue — PVC and PPR

Pipe nominal inside diameter and clamp outside-diameter fit are different measurements. Check the actual pipe outside diameter against the matching class.

Nominal size	Class A pipe OD — mm	Class B pipe OD — mm	Adapter pipe OD — mm	Flow range — m³/h
DN15	18.5–22.5	Not listed	18.5–22.5	0.2–3.5
DN20	24–29	22.5–27.5	22.5–29	0.4–6
DN25	30.5–35.5	29–34	29–35	0.5–9
DN32	37.5–42.5	36–41	36–42.5	0.9–15
DN40	49.5–54.5	48–53	48–54.5	1.3–23
DN50	58.5–63.5	57–62	57–63.5	2.0–35

Class B fit uses the supplied rubber pads. For DN25, the adapter column gives 29–35 mm while Class A extends to 35.5 mm; confirm fit for pipe outside diameters above 35 mm.

Product Dimensions — mm

Complete original GF-S-CL top, left and front views showing W1, W2, L1, L2, H1, H2 and diameter

Size	W1	W2	L1	L2	H1	H2	Ø
DN15	42	42	96	110	63	32.5	22.5
DN20	42	59.5	96	110	69.5	32.5	29
DN25	42	59.5	96	110	76	32.5	35.5
DN32	42	64.5	96	110	83	32.5	42.5
DN40	42	76.5	96	110	95	32.5	54.5
DN50	42	85.5	96	110	104	32.5	63.5

Build your GF-S-CL ordering code

Example — GF-S-CL-EM-DN15

GF-S series with 4–20 mA output, energy equipment configuration and DN15 pipe size. PC engineering plastic casing and clamp; standard 4 m cable.