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D2 · Specialist

Compact coolant monitor for CDUs.

The D2 is a compact, dedicated monitor for precise flow tracking within coolant distribution units (CDU).

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D2 ultrasonic measurement instrument

At a glance

What D2 does, in plain words.

What it measures
Liquid flow
How much liquid moves through the pipe.
How it installs
Clamp-on
Sensors fit on the outside of the pipe, so the pipe stays closed.
How it connects
RS485 / 4–20 mA
Wired into control systems over Modbus RS485, or as a 4–20 mA signal.
Pipe sizes
DN15–DN32
DN is the nominal pipe size, roughly the inside diameter in millimetres.

Why D2

D2 in short.

The D2 is a compact, dedicated monitor for precise flow tracking within coolant distribution units (CDU). It responds quickly to flow variations, supporting the thermal stability of mission-critical equipment. With streamlined installation and stable data output, it helps maintain cooling efficiency in high-density computing environments.

Where it is used
  • Data centres
  • Liquid cooling
D2 · 2026 product catalog D2 · 2026 product catalog

How it works

Sound with the flow arrives sooner.

Two sensors on the same side of the pipe take turns sending sound through the water. Sound travelling with the flow arrives slightly sooner than sound travelling against it; the meter turns that time difference into flow, which is why it needs to know your pipe.

How clamp-on ultrasonic measurement works →

Pipe & installation

What the meter needs to know about your pipe.

These are set up on the meter after installation. Pipe size and transducer type are decided when ordering.

Pipe & installation guide pipe materials, sizes, setup checklist

Stainless steel · 2″ example

A smooth metal surface. Clean the spot, add coupling gel, then clamp the sensor on.

60.3mmacross the outside
2.8mmwall thickness
54.8mmacross the inside

Pipe sizes are names, not measurements: a 2″ pipe is 2.375″ across.

The meter needs Pipe size Wall thickness Material: Stainless steel
Technical details standards, OD / ID, both units
Standard
ASME B36.19 · 2″ Sch 10S
Outside diameter (OD)
2.375″ (60.33 mm)
Wall
0.109″ (2.77 mm)
Inside diameter (ID)
2.157″ (54.79 mm)
Meter parameters
OD · wall · material

This guide shows what a clamp-on meter needs to know about a pipe. It does not mean every model fits every pipe: check the specifications below or ask an engineer.

Specifications

Check the fit before you specify.

The short version is above. These are the specifications published for D2; values that are still being checked are left out.

Performance

Flow velocity
0.3–5.0 m/s (1.0–16 ft/s)
Pipe sizes
DN15, DN20, DN25, DN32
Accuracy
±2% of reading (0.3–5.0 m/s)
Repeatability
0.4%
Medium
Water, deionized water, ethylene glycol–water mixture, propylene glycol–water mixture, oil-based coolant, fluorocarbon fluid
Coolant concentration
Confirmed with the customer for each project
Application
Data-centre liquid cooling
Pipe material
Stainless steel

Function

Analogue output
4–20 mA, max. load 500 Ω
Communication
RS485 with Modbus protocol
Power supply
10–36 VDC, 500 mA max.

Physical

Ambient temperature
−10 °C to 50 °C (14 °F to 122 °F)
Transducer temperature
0 °C to 60 °C (32 °F to 140 °F)
Ingress protection
IP65
Transducer cable
φ5 six-core cable, 2 m (6.6 ft) standard

Need a value that is not listed, or the datasheet for your configuration? Ask an engineer.

What these terms mean
DN
Nominal pipe size, roughly the inside diameter in millimetres (DN50 ≈ 50 mm).
Clamp-on
Sensors strap to the outside of the pipe. No cutting, no shutdown for installation.
PoE
Power over Ethernet: one network cable carries power and data.
LoRaWAN
Long-range, low-power wireless. Readings travel through a gateway to a network server.
Modbus RS485
A wired connection widely used by building and industrial control systems.
4–20 mA
An analogue signal where the current represents the reading.

Documents

Datasheets and manuals.

No reviewed documents are published for D2 yet.

Request the current datasheet or manual →

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