Liquids and gases play a considerable part in the results of quality control and operational safety e.g. coolant supply flow, lubricant supply flow and ventilation systems, thus it is important to monitor that these media are in sufficient quantities, at the right time, at the right place.

flow measuring systems using impeller sensors

200 series

Flow measuring system for closed pipes with “T” mount PVC impellers, that feature a six bladed impeller design with a non magnetic sensing mechanism connected to a 4-20mA transmitter, and an optional remote digital meter/controller with multipple choice of outputs (2/4 transistor relays, 0-10V/4-20mA, RS232/RS485, Profibus, DeviceNet).

Six bladed impeller PVC Tee flow sensors
Also available in brass/bronze, and stainless steel sensors

together with the relevant metal Tees,as well as special versions for underground installations.

Accuracy 1% of the max range (0.3-9.0m/sec)
Linearity 1% of the max range
PVC Tee available for 1 ½, 2, 3, 4” pipes (or threaded fittings for large diameter pipes),

SIGMA ST Series Compact Ultrasonic Clamp on type flow meter

measuring without contact with the liquids

Description
Sigma ST is very unique in its structural design. It uses a circular magnetic steel to achieve automatic connection during installation. It takes only 2-3 minutes to complete the whole process from installation to measurement. It also adopts the current popular OLED display, which makes it easy to read in low light conditions.

Sigma ST series flow meters offer users easy installation, no process downtime, no pressure loss or leak and no contamination of the medium to be measured.

Features
● With the world's most advanced time measurement chip (time resolution of SOps), a new
generation of stable flow meters has been developed
● The flow meter is fitted on the outside of the tube without additional pipe interventions required
● No expertise required, installation and measurement can be done according to the operating instructions
● No moving parts, no pressure loss. The flow meter can be installed without stopping production

Characteristics
Flow Range: 0.1 m/s~5.0 m/s
Accuracy: ±2.0%
Repeatability: 0.8%
Pipe Size: Φ6.35 ~ Φ90
Sigma ST holds statistics of daily, monthly, and annual consumption over a long period of time.
Flow Totalizer
Analogue Output: 4~20mA, Maximum load: 600Ω
Alarm Output: OCT, Upper and lower limit alarm function (optional)
Communication: RS485, support Mod bus communication protocol
Power Supply: 24 VDC
Cable Length: 2.0m
Keypad: Four light touch buttons
Screen: OLED 128*64 display screen
Units: Metric and imperial units are available, Cubic Meters(m³), Liters(L), USA Gallons(GAL)/hour, /min, Default unit setting: m³/h
Totalizer: Six bit digit
Piping Material: Stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe
Housing Material: Aluminum alloy
Environment Temp. : 0℃~50℃(32°F~122°F)
Medium Temp. : 0℃~50℃(32°F~122°F)
Environment Humidity: 0-95% relative humidity, without condensation
IP rating: IP54

Applications
• Treated Water
• Water distribution flow metering
• Building Services
• Sea water
• Leak Detection
• Power/Energy Management
• Food/Hygienic flow-monitoring
• Cooling Water
• Chemical / Pharmaceutical
• Alcohols
• Chemical solvents
• Acids
• Pump inspection
• Hydraulic Oil
• Low-Conductivity Water
• Water / Glycol Solutions
• Diesel
• Survey work
Also used in the production to measure water and other liquids throughout the facility.

Technical Data
Model: SIGMA ST Series
Flow Range: 0.1 m/s~5.0 m/s
Accuracy: ±2.0%
Repeatability: 0.8%
Pipe Size: Φ6.35 ~ Φ90
Data Storage: Daily, monthly, and Annual. Flow Totalizer
Analog Output: 4~20mA, Maximum load: 600Ω
Alarm Output: OCT, Upper and lower limit alarm function (optional)
Communication: RS485, support Mod bus communication protocol
Power Supply: 24 VDC
Cable Length: 2.0m
Keypad: Four light touch buttons
Screen: OLED 128*64 display screen
Units: Metric and imperial units are available, Cubic Meters(m³), Liters(L), USA Gallons(GAL)/hour, /min, Default unit setting: m³/h
Totalizer: Six bit digit
Piping Material: Stainless steel pipe, carbon steel pipe, copper pipe, plastic pipe
Case Material: Aluminum alloy
Environmental Temp.: 0℃~50℃(32°F~122°F)
Medium Temp.: 0℃~50℃(32°F~122°F)
Environment Humidity: 0-95% relative humidity, without condensation
IP rating: IP54

Also available with optional remote display

Model 6.1 Transit Time Flow meter

A Transit Time Ultrasonic Flow Meter measuring with Clamp-On sensors without contact with the liquids.

For clean liquids in closed full pipes (< in full pipes with less than 2% solids or gas bubbles at flow velocities from ±0.07 to 39 ft/sec (±0.02 to 12 m/sec) such as water, water/glycol solutions, hydraulic oil, diesel, etc.

Non-Contacting Clamp-on Ultrasonic Transducers
accuracy of ±1% of reading or 0.1 ft/sec (0.03 m/sec), whichever is greater
Works on Metal and Plastic Pipes
Large Backlit Flow Rate Display and Totalizer
Isolated 4-20mA Output
Built-in 5-Key Calibrator
2 Programmable Control Relays
128 MB Data Logger

Accurately measure the flow rate of clean, non-aerated liquids like water, chemicals, and oils in full pipes. Ultrasonic transducers mount on the outside of a pipe without shutting down flow. Flow rate is displayed on the large, backlit display along with totalizer and signal strength. Use the built-in control relays for flow alarms or flow proportionate pulse. Connect the isolated 4-20mA output to PLC's or controllers.

Model 6.1 Transit Time Flow Meter works on a wide range of pipe sizes and materials including carbon steel, stainless steel, ductile iron, cast iron, PVC, PVDF, fiberglass, copper, brass, aluminum and pipes with bonded liners including epoxy, rubber and Teflon.

Model 6.1  Transit Time Flow meter operates by measuring the “transit time” or “time of flight” for ultrasonic sound pulses transmitted from one transducer to another. Depending on the mounting configuration, the signal may cross the pipe once, twice or four times. To measure flow the transit time is compared between ultrasonic signals travelling upstream and downstream.

Standard Features Include:
pair SE16B ultrasonic transducers - clamp-on for 1/2” to 48” (12 mm to 1200 mm) pipes and rated non-incendive for Class I, Division 2, Groups A, B, C & D locations
sensor cables - pair 25 ft / 7.6 m coaxial with BNC connectors
flow rate range: ± 0.07 to 39 ft/sec (± 0.02 to 12 m/sec)
installation - stainless steel transducer mounting brackets and clamps, alignment bar and silicone coupling compound kit
enclosure - watertight, NEMA4X (IP66) polyester and polycarbonate
display - white, backlit matrix
totalizer - 14 digits
calibration - built-in 5-key programmer
output - isolated 4-20mA (1000 ohm)
2 control relays - 5 amp, SPDT - programmable for flow proportional pulse output, and/or flow alarm
plug-and-play options including data logger and extra control relays
power input - 100-240VAC 50/60Hz, 4 Watts maximum
electrical surge protection and RFI filters - AC, sensor, 4-20mA

How it works

Transit Time transducers typically operate in the 1-2 MHz frequencies. Higher frequency designs are normally used in smaller pipes and lower frequencies for large pipes up to several meters in diameter. So operators must select transducer pairs/frequencies according to the application. Doppler transducers usually operate at 640 kHz to 1 MHz frequencies and work on a wide range of pipe diameters.
Transit Time Flowmeter with Two Ultrasonic Sensors

Transit Time flowmeters must have a pair of transducers, each containing a piezo-electric crystal. One transducer transmits sound while the other acts as a receiver.
As the name suggests, Transit Time flowmeters measure the time it takes for an ultrasonic signal transmitted from one sensor, to cross a pipe and be received by a second sensor. Upstream and downstream time measurements are compared. With no flow, the transit time would be equal in both directions. With flow, sound will travel faster in the direction of flow and slower against the flow. Because the ultrasonic signal must cross the pipe to a receiving transducer, the fluid must not contain a significant concentration of bubbles or solids. Otherwise the high frequency sound will be attenuated and too weak to traverse the pipe.

Model 6.1 Doppler Flow Meter

A Doppler Ultrasonic Flow meter measuring difficult liquids, HFO, corrosive chemicals, viscus liquids, crude oil, slurries, etc, with a single high temperature probe, without contact with the liquid.

Model 6.1 doppler is ideal for "difficult liquids" that would damage regular flow meters - Designed for liquids such as :
Raw Sewage, Viscous liquids, Sludge and Slurries
Solvents, Pulp stock, Food products, Lubricating Oils, HFO, Crude Oil, Chemicals, viscous liquids and abrasives.
Ideal for full pipes and any liquid containing
gas bubbles or solids larger than 100 microns
and in concentrations greater than 75 ppm.

There is no obstruction to flow and no pressure drop. The standard, strap-on ultrasonic sensor fits any pipe 1/2" (12.5 mm) Inside Diameter or larger. The electronics/display enclosure can be mounted nearby.

Use the isolated 4-20mA to transmit flow to remote displays, recorders or controllers. The 2 programmable relays can be used for flow control, pump protection or flow proportionate pulse. Calibration is easy with the built-in 3-key calibrator. Display and totalize flow in your choice of engineering units (gallons, liters etc.)

Sensor cable can be extended up to 500 ft. (152 m) with no loss of signal. Model 6.1 doppler can be equipped with intrinsic safety barriers for sensor installation in hazardous rated locations. Other options include high temperature sensors and a built-in 2 million point Data Logger.
Model 6.1 doppler includes a new digital signal processor to filter background noise and interference and to measure flow rates between 0.2 to 40 ft/sec (0.06 to 12.2 m/sec) with accuracy of ±2% of full scale on liquids with entrained particles or gases of 100 microns or larger and minimum concentrations of 75 ppm. The flow meter operates with a single-head flow sensor mounted externally on any contiguous pipe material that conducts sound including: carbon steel, stainless steel, ductile iron, copper, FRP, PVC, ABS, or cement lined pipe from 1/2" to 180" (12.5 mm to 4.5 m) ID.

Main Features

Non-Contacting Ultrasonic Sensor
Display: Large, White, backlit matrix - displays flow rate, relay states, 16-digit totalizer, operating mode and calibration menu
16-Digit Totalizer
power input - 100-130VAC 50/60Hz
Isolated 4-20mA (1000 ohm)
2 control relays, rated 5 amp SPDT, programmable flow alarm and/or proportional pulse
proportional pulse output, and/or flow alarm
Automatic Sensitivity Adjustment
Intrinsically Safe Sensor Option
Built-in 5-Key Calibrator
sensor - strap-on, single head ultrasonic for 1/2" to 180" (12.5 mm to 4.5 m) ID pipes
sensor operational temperature: from -40°C to 150°C (-40°F to 300°F)
sensor cable - 20ft / 6m shielded coaxial pair
accuracy of ±2% of full scale on liquids with entrained particles or gases of 100 microns or larger and minimum concentrations of 75 ppm
Repeatability: ±0.1%,
Linearity ±0.5% of full scale
enclosure - watertight NEMA4X (IP66) polycarbonate
Built-in 26 million point logger

How it works

Model 6.1 Doppler flow meters measure flow from outside a pipe with a strap-on sensor. Model 6.1 meters continuously transmit high frequency sound (640 kHz) that travels through the pipe wall and into the flowing liquid. Sound is reflected back to the sensor from solids or bubbles in the fluid. If the fluid is in motion, the echoes return at an altered frequency proportionate to flow velocity. Model 6.1 flow meters continuously measure this frequency shift to calculate flow.

The Doppler technique only works on liquids which contain solids or gas bubbles to reflect its signal. These are "difficult" liquids that may damage regular flow meters: viscous and corrosive chemicals, sludge, abrasives, etc. Because the sensor mounts on the outside of the pipe, there is no pressure drop and no obstruction to flow.

For best performance Doppler sensors should be mounted away from turbulence creating devices like pipe elbows and tees, and away from velocity increasing devices like controlling valves and pumps. Typical accuracy is ±2% of full scale.

Options

Built-in 2 million point logger with USB output and Windows™ software
Sensor Cable 15m Extension Cable
Power Input 9-32VDC
Model 6.1 includes a new digital signal processor to filter background noise and interference and to measure flow rates between 0.2 to 40 ft/sec (0.06 to 12.2 m/sec) with accuracy of ±2% of full scale on liquids with entrained particles or gases of 100 microns or larger and minimum concentrations of 75 ppm. The flow meter operates with a single-head flow sensor mounted externally on any contiguous pipe material that conducts sound including: carbon steel, stainless steel, ductile iron, copper, FRP, PVC, ABS, or cement lined pipe from 1/2" to 180" (12.5 mm to 4.5 m) ID.

Model 6.1 doppler is ideal for "difficult liquids" that would damage regular flow meters -, HFO, chemicals, sludge, viscous liquids and abrasives. There is no obstruction to flow and no pressure drop. The standard, strap-on ultrasonic sensor fits any pipe 1/2" (12.5 mm) Inside Diameter or larger. The electronics/display enclosure can be mounted nearby.

Use the isolated 4-20mA to transmit flow to remote displays, recorders or controllers. The 2 programmable relays can be used for flow control, pump protection or flow proportionate pulse. Calibration is easy with the built-in 5-key calibrator. Display and totalize flow in your choice of engineering units (gallons, liters etc.)

Sensor cable can be extended up to 500 ft. (152 m) with no loss of signal. Model 6.1 can be equipped with intrinsic safety barriers for sensor installation in hazardous rated locations. Other options include high temperature sensors and a built-in 2,000,000 point Data Logger.

Model 5 portable doppler flow meter

A Portable Doppler Ultrasonic Flow meter measuring difficult liquids, HFO, corrosive chemicals, viscus liquids, crude oil, slurries, etc, with a single high temperature probe, without contact with the liquid.

Ideal for measuring full pipe flow of any liquid containing gas bubbles or solids larger than 100 microns and in concentrations greater than 75 ppm. The Portable Ultrasonic Flow Meter is fast and easy to use - you can mount the sensor on the outside a pipe and calibrate the flow meter in just a few minutes. Recommended for "difficult liquids" like chemicals, HFO, viscous liquids and abrasives wastewater, slurries, sludge. Measures flow through most metal and plastic pipes including PVC, steel, stainless steel.

The instrument is AC/DC powered with a built-in battery and charger. With its 4-20mA output you can use the flow meter as a spare transmitter for critical applications. For flow troubleshooting, the RS232 output can be connected to your computer or modem to receive and log flow at programmable intervals. PC software is included with each instrument and data files can be imported to any spreadsheet program for analysis and graphing.

main advantages

No Contact with the liquid
No Pipe cutting required: Install without shutting down flow
Low-cost: Strap-on Sensor fits any pipe size
Optional intrinsically safe Sensors
Ideal for “difficult liquids” including viscous and corrosive chemicals, HFO, abrasives, raw sewage, sludge, slurries, performance evaluation, projects, etc.
main features

Pipe Ranges 12.5mm to 4500mm ID
forward and reverse flow ± 0.1 to 40 ft/sec (± 0.03 to 12.2 m/sec).
Single Strap-on sensor head with 3.6m cable
Accuracy +/- 2% FS (Requires solids/bubbles 100 microns min)
Repeatability +/- 0.25% with unchanged sensor position
Linearity +/- 0.5%
Fluid Temp -40° to 300°F (-40° to 150°C)
Pipe Materials Steel, St Steel, Copper, Rigid Plastic etc
Power Supply 100-240VAC 50/60Hz &Internal Battery
Battery Life 18 hrs continuous operation
Outputs 0/4-20 mA 500 ohms,
Have a built-in 300,000 point data logger, USB output and connecting cables.
Display Velocity, Flow Rate & Total, in selectable Eng. units
Two technologies, one decision:
Doppler flowmeters work best in dirty or aerated liquids like wastewater and slurries.

Transit Time flowmeters work with clean liquids like water, oils and chemicals.