Permaflow®
Fixed, Clamp‑On Transit‑Time Ultrasonic Flow Meter
The Permaflow® is a permanently installed, clamp‑on ultrasonic flow and heat meter designed for continuous monitoring. Using transit‑time technology, it measures liquid flow in pipes without cutting or interrupting the system. It is suitable for fluids containing less than 10% gas or solid content and operates on mains power for 24/7 use. Under ideal conditions, it achieves a measurement accuracy of approximately ±0.5%.
P/N: 3578010-FLOW
CAGE Code: KD983 – COLTRACO LIMITED
Overview
Clamp‑On, Fixed Ultrasonic Flow & Heat Meter
The Permaflow® is a permanently installed ultrasonic transit‑time flow and heat meter designed for high‑accuracy measurement without cutting or modifying pipework. Independently tested and calibrated in an ISO 17025‑accredited laboratory, it achieves measurement accuracies of approximately ±0.5% under ideal conditions.
Built in the UK using high‑quality materials, it offers a durable, cost‑effective solution for continuous monitoring.
Flow & Energy Measurement Capabilities
The Permaflow® can measure several different flow‑related parameters:
Volumetric Flow Rate — e.g., litres per hour (l/h), gallons per minute (gpm)
Mass Flow Rate — e.g., kilograms per hour (kg/h)
Heat/Energy Flow Rate — e.g., kilowatt‑hours (kWh), British Thermal Units (BTU)
Each measurement can be totalised individually, giving complete accumulated values for the measurement period.
Temperature Integration & Heat Metering
The system accepts PT100 temperature inputs, enabling simultaneous monitoring of fluid temperature.
With two PT100 sensors installed (supply & return), the Permaflow® can perform heating and cooling energy calculations—commonly required for HVAC performance verification, thermal efficiency assessments, and compliance in heat network applications.
Measurement units are selectable in both metric and imperial formats, including l/h, gpm, kWh, and BTU.
Modular Design & Data Handling
The Permaflow® is built with a modular I/O architecture, allowing users to select only the communication and functionality modules they require. Key features include:
USB and RS232 interfaces as standard
16 MB internal memory, capable of storing over 90,000 measurements
Ability to log data internally or stream live data to a PC
A built‑in signal oscilloscope for sensor alignment and diagnostic checks during setup
Highlighted Specifications
(Full technical specifications available separately)
Suitable for pipe sizes DN15 – DN2500
Compatible with most clean liquids
Works with a broad range of pipe materials
Accuracy: ±0.5% (ideal conditions)
Flow velocity range: 0.01 – 25 m/s
Resolution: 0.25 mm/s
Repeatability: 0.15%
Main unit rating: IP65
Sensor rating: IP66
Sensor temperature range: –20°C to +150°C
Internal memory: 16 MB
Interfaces: USB & RS232
Large internal database: 19+ fluid types and 23+ pipe materials
Technical Specifications
Dimensions
• Height: 160 mm
• Width: 82 mm
• Depth: 30 mm
• Weight: 300 g
Pipe Diameter Range
• Standard Sensor (DM10): DN15–DN700 (½"–28")
• Large Sensor (DS10): DN25–DN2500 (1"–98")
• Supports 12+ pipe materials (built‑in database)
Liquid Types
• Suitable for clean liquids with <10% gas/solids
• Includes database of 19+ liquid types
Operating Temperature
• Main unit: –10°C to +65°C
• Sensors: –20°C to +150°C
IP Rating
• Main unit: IP65
• Sensors: IP66
Certifications
• CE
• Manufacturer certified to ISO 9001:2015 & ISO 14001
Warranty
• Main unit: 3 years
• Sensors: 1 year
• Lifetime technical support
Accuracy
• ±0.5% (ideal conditions)
Flow Velocity Range
• 0.01 – 25 m/s
Resolution
• 0.25 mm/s
Repeatability
• 0.15% of measured value
Turn‑Down Ratio
• 1 / 100
Measurement Rate
• 1 Hz
Measurement Units
• Flow velocity
• Volumetric flow
• Mass flow
• Energy/heat flow
• Total volume
• Mass
• Energy
• Suitable for heat‑metering applications
Display
• 240 × 160 pixel graphical display with backlight
Built‑In Tools
• Signal oscilloscope for sensor alignment & diagnostics
Optional Plug‑In Modules
• PT100 thermometer input
• 4–20 mA current input
• 4–20 mA current output
• Digital input
• Modbus RTU
• Relay output
• OPTO output
• Open‑collector output
Sensor Dimensions
• DM10: 40 × 20 × 25 mm
• DS10: 60 × 30 × 35 mm
Sensor Material
• Housing: Stainless steel
• Front face: PEEK
Cable Length
• 3 m standard
• Longer lengths on request
Power Supply
• 12–36 V DC (10 W)
• AC mains compatible (100–240 V)
Datalogging
• 16 MB internal storage
• Logs all measurement parameters
Communication (Standard)
• RS232
• USB
• Supports CLI control & data download
What’s Included
Permaflow® Main Unit (RS232 and USB communications included): Main electronic unit
Mains Power Supply: Supplies 12V – 36V DC to the main unit (suitable for mains AC power 100V – 240V)
Pair of Standard Sensors (Model No. DM10) for pipes DN15: DN700 with 3m length cable (set of 2) – Compact, ultrasonic flow measurement sensors
Pair of Jubilee Clips for your pipe sizes (set of 2):Strong, metallic bands suitable for more permanent fixture of your sensors
USB Cable: For connecting the Permaflow® to your PC for direct download or export of logged data
Measuring Tape: For measuring the distance between flow measurement sensors during set-up process
Ultrasonic Couplant: For ensuring good contact between sensors and pipe wall
User Manual: Contains further information regarding functionality of the instrument and how-to-use
Installation Manual: Contains further guidance on how to install the flow measurement sensors on the pipe
Calibration Certificate: As evidence that the unit has been tested and shown to be working before dispatch
