Brand: pFlow

pFlow D2 Coolant Monitor for Data Center Cooling

Name: pFlow D2 Coolant Monitor for Data Centers | Seven Star LLC
Brand: pFlow

Description

Overview

The pFlow D2 is a compact clamp-on ultrasonic coolant monitor purpose-built for data center liquid cooling infrastructure, where confined rack and manifold spaces leave no room for bulky metering hardware. Covering pipe sizes DN15 through DN32 with an accuracy of ±2% of reading, the pFlow D2 detects flow non-invasively across deionized water, ethylene glycol-water and propylene glycol-water mixtures, oil-based coolants, and fluorocarbon fluids — the full spectrum of media used in modern direct liquid cooling loops.

As the official authorized partner and exclusive regional representative for pFlow Gentos, Seven Star LLC proudly supplies the pFlow D2 across the Sultanate of Oman and the wider GCC, complete with calibration documentation and local engineering support. Our instrumentation division in Muscat supports the growing base of data center and high-density compute facilities being developed throughout Oman, including projects in the Sohar and Salalah economic zones.

Measurement Principle of the pFlow D2

The pFlow D2 operates on the ultrasonic clamp-on principle, detecting flow through the pipe wall without cutting the line or contacting the coolant directly. A matched transducer pair mounted in the compact pipe clamp sends acoustic signals through the flowing medium, and the instrument resolves the resulting signal characteristics into velocity and volumetric flow readings displayed on its integrated 1.54-inch colour screen.

Because the sensor never contacts the liquid, the pFlow D2 eliminates any risk of leakage at a process penetration — a critical requirement in server halls where coolant contact with electronics is catastrophic. The non-intrusive design also means zero pressure drop across the measurement point, preserving the pump head budget in tightly engineered liquid cooling loops, and no moving parts to wear or service over the equipment’s operating life.

Engineering Design of the pFlow D2

The pFlow D2 integrates transmitter and transducer into a single compact, lightweight housing built from PC engineering plastic, secured to the pipe by a matching pipe clamp of the same material. A four-step installation procedure — clean the pipe, snap on the clamp, tighten the four diagonal screws, then configure pipe parameters through the menu — gets the instrument measuring accurately in minutes, with adhesive pads available for looser-fitting installations. The 1.54-inch colour LCD at 240×240 resolution and three-key touch interface keep the footprint minimal, a deliberate design choice for the tightly packed manifolds typical of rack-level cooling distribution.

Electrical connection uses a Ø5 mm black six-core cable fitted with an M12 A-code connector at a standard 2-metre length, colour-coded for power, RS-485, and 4–20 mA output. The 10–36 VDC power input allows the pFlow D2 to share supply with existing rack-level DC infrastructure, and the IP65-rated housing tolerates the occasional condensation and dust exposure found in mechanical support spaces adjacent to server halls.

Key Features

The following capabilities define the pFlow D2 and explain its selection for data center and small-pipe liquid cooling applications:

Ultra-compact clamp-on design fits the confined manifold and rack-level spaces typical of data center liquid cooling distribution, where larger meters simply do not fit.
Compatible with deionized water, ethylene glycol-water and propylene glycol-water mixtures, oil-based coolants, and fluorocarbon fluids covers the full range of media used across direct liquid cooling technologies.
Four-step clamp-on installation with no pipe cutting minimizes downtime during retrofit of live cooling loops in operational server halls.
Combined 4–20 mA isolated analog output and RS-485 Modbus communication give integrators flexibility across legacy building systems and modern DCIM platforms.
Accuracy of ±2% of reading with 0.4% repeatability delivers dependable flow trending for thermal management and capacity planning decisions.
IP65-rated PC engineering plastic housing withstands the humidity and dust conditions typical of mechanical support spaces adjacent to compute infrastructure.
Pipe size coverage from DN15 to DN32 addresses the smaller branch and manifold piping common in rack-level and row-level cooling distribution.
Wide 10–36 VDC power input shares supply with existing rack or row-level DC infrastructure, avoiding dedicated transformers.

Industrial Applications

The pFlow D2 is deployed primarily in data center direct liquid cooling systems, monitoring coolant flow across immersion cooling, direct-to-chip, and cold-plate architectures where compact instrumentation is a hard requirement rather than a preference. Beyond data centers, the instrument serves pharmaceutical production water monitoring, general water and wastewater management, and HVAC applications across Oman’s commercial and industrial base, including chemical, pharmaceutical, and food and beverage process lines where small-diameter piping and demanding media compatibility are common constraints.

As the officially authorized partner for pFlow Gentos, Seven Star LLC distributes the pFlow D2 to data center operators, colocation providers, and industrial clients throughout Oman and the GCC, including facilities in the Sohar and Salalah economic zones supporting the region’s expanding compute and manufacturing capacity. Our engineering team supports pipe-size verification, coolant compatibility review, and commissioning for both new liquid cooling deployments and retrofit projects.

Technical Specifications

The complete technical specification of the pFlow D2 coolant monitor is detailed below:

Parameter	Specification
Model	pFlow D2
Flow Velocity Range	0.3–5.0 m/s
Accuracy	±2% of reading
Repeatability	0.4%
Pipe Sizes	DN15, DN20, DN25, DN32
Measuring Medium	Deionized Water, Ethylene Glycol-Water Mixture, Propylene Glycol-Water Mixture, Oil-Based Coolant, Fluorocarbon Fluid
Pipe Material	Stainless Steel
Communication Interface	RS-485, Modbus Protocol
Output	4–20 mA, max load 500 Ω, isolated
Power Supply	10–36 VDC / 500 mA
Keyboard	3 touch keys
Display Screen	1.54″ LCD colour screen, resolution 240×240
Operating Temperature	Transmitter: -10°C to 50°C; Transducer: 0°C to 60°C
Humidity	20–90% relative humidity, non-condensing
Ingress Protection	IP65
Housing / Clamp Material	PC engineering plastic
Transmitter	Integrated
Transducer	Clamp-on
Cable	Ø5 mm six-core cable, M12 A-code connector, standard length 2 m
Certification	ISO 9001, ISO 14001, CE
Place of Origin	Shenzhen, China

Request a Quote for pFlow D2 Coolant Monitor for Data Center Cooling

To request a formal quotation for the pFlow D2, confirm current availability and lead time, or obtain the complete technical datasheet, contact the Seven Star LLC instrumentation division. As the authorized partner for pFlow Gentos in Oman and the GCC, we supply factory-calibrated instruments on request, and our application engineers are available to advise on coolant compatibility, pipe-size selection, and integration with your data center DCIM or building monitoring platform. Submit an RFQ today and our team will respond with pricing, lead time, and a recommended configuration for your application.

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About brand

Clamp-on ultrasonic flow measurement is what pFlow does. The sensors strap to the outside of the pipe and measure liquid flow by transit time, so the line is not cut and nothing touches the fluid. The brand comes from Gentos, an instrument maker focused on ultrasonic flowmeters, flow sensors and heat and cooling energy meters.

Seven Star LLC is the pFlow agency for Oman and the GCC, listing pFlow ultrasonic flowmeters in fixed, portable and LoRaWAN versions, BTU meters and LoRaWAN flow control valves.

pFlow flowmeter families

Most of the listed models are compact clamp-on sensors grouped by pipe size and duty. The GF family (GFCL, GFR, GF-S-CL, GF-SH-CL for hot water and GF-GH-CL for immersion cooling) and the MF micro flowmeters (MFR, MFCL) serve cooling and process loops on small and medium pipes. The MP series are plug-and-play flow sensors, including the MP801 and a LoRaWAN version. The D116-BTU is a wall-mounted ultrasonic BTU meter, the P116 a portable flowmeter for surveys, and the F8 a fixed meter used in aquaculture. Gentos also builds the F3 series clip-on flowmeters, including a panel-mount version. The VC200-R is a LoRaWAN ball valve that works as a flow switch.

Where pFlow meters are used

The manufacturer documents use in liquid cooling for data centers and semiconductor plants, chilled and hot water metering in central air conditioning, water supply networks and irrigation, aquaculture, and utility lines in petrochemical and power plants.

Ordering a pFlow ultrasonic flowmeter: what we need

Clamp-on meters are selected from pipe data. Send the pipe outside diameter, wall thickness and material, any liner, the liquid and its temperature, the expected flow span and the straight pipe length available. Add the output you need (4-20 mA, pulse, Modbus, LoRaWAN) and the supply voltage. For BTU meters include the supply and return temperature span.

FAQ

Questions about the pFlow D2 Coolant Monitor for Data Center Cooling

Answers from our engineering team on installation, compatibility and integration.

01Why is the pFlow D2 specifically suited to data center cooling?

The pFlow D2 uses an ultra-compact clamp-on housing designed to fit the confined rack and manifold spaces typical of data center liquid cooling distribution, where larger conventional flowmeters cannot physically fit. Its non-contact ultrasonic sensing also eliminates any risk of coolant leakage near sensitive electronics.

02What coolant types is the pFlow D2 compatible with?

The pFlow D2 measures deionized water, ethylene glycol-water mixtures, propylene glycol-water mixtures, oil-based coolants, and fluorocarbon fluids, covering the range of media used across immersion cooling, direct-to-chip, and cold-plate liquid cooling architectures.

03How long does installation take and does it require draining the loop?

Installation follows a four-step clamp-on procedure: clean the pipe surface, snap on the clamp, tighten the four diagonal screws, then configure pipe parameters through the on-screen menu. No pipe cutting or draining is required, which is essential for retrofitting monitoring onto live, operational cooling loops.

04What pipe sizes does the pFlow D2 support?

The pFlow D2 covers DN15, DN20, DN25, and DN32 pipe sizes, which matches the smaller branch and manifold piping typical of rack-level and row-level liquid cooling distribution rather than large building mains.

05Is Seven Star LLC an authorized representative for pFlow products?

Yes. Seven Star LLC is the official authorized partner and exclusive regional representative for pFlow Gentos in the Sultanate of Oman and the wider GCC. All instruments are supplied as factory-calibrated units with calibration documentation, backed by local engineering support with selection and specification.