Ultrasonic Clamp-On Flowmeters

Sigma 226 Series

Transit Ultrasonic Wall Mounted Flow Meter

Flow range: 0.03m/s-10m/s
Accuracy: ±1% of measured value
Repeatability: 0.2%
Screen: LCD 240*128 with backlight
Power supply: 10-36 VDC or 90-245V AC
Transmitter housing: IP65, ABS
(Temperature: -20℃~60℃)
Output: OCT pulse output 0-10KHz, 4-20mA, Relay
Communication: RS485
Duct size range: 25mm-1200mm
Sensor Type: clamping
Degree of protection: IP68
Cable length: 5 meters/pc
Sensor operating temperature: -40℃ ~ +80℃
It supports SD card

Please note that Transit type ultrasonic flow meters are for applications in closed full pipes, and liquids with < 2% solids or bubbles

Sigma 6100-EP series

Doppler Portable Ultrasonic Flow Meter

Sigma 6100-EP is a Doppler Portable Ultrasonic Flow Meter designed to measure volumetric flow in full pipes containing bubbles or suspended particles larger than 100 microns and in concentrations not less than 75ppm.
Sigma 6100-EP can display flow rate, has a flow totalizer, a 4-20mA output, Relays for Totalizer and Alarm outputs.

Rechargeable battery can work up to 50 hours
It is suitable for pipe sizes ranging from 40 to 4000mm
For for difficult liquids, corrosive chemicals, viscus liquids, wastewater, slurries, sludge, that contain bubbles or suspended particles larger than 100 microns and in concentrations not less than 75ppm.
Excellent low flow rate measurement ability, low to 0.05m/s
A wide range of flow measurement, high flow rate can reach 12m/s
High-temperature transducer is suitable to liquids of -35℃ ~ 200℃
Do not need to shut down the pipe flow when installing the transducers
User-friendly configuration
4-20mA, Relay Totalizer and Relay Alarm outputs
Accuracy: 2.0% Calibrated span

Technical Parameters:

Measurement principle: Doppler ultrasonic
Resolution: 0.50mm/s
Repeatability: 0.2% of reading
Accuracy: 0.5% -- 2.0% F.S.
Response time: 2-60s for optional
Flow Velocity Range: 0.05- 12 m/s
Liquid Types Supported: Liquids containing 100ppm of reflectors and at least 20% of the reflectors are larger than 100 micron.
Power Supply: AC: 85-265V , DC:24V/500mA
Enclosure type: Portable
Protection rating: IP65
Operating temperature: -20℃ to +60℃
Housing material: ABS
Measurement Channels: 1
Display: 2 line × 8 characters LCD, 8-digit rate or 8-digit total (resettable)
Units: User Configured (Imperial and Metric)
Rate: Rate and Velocity Display
Totalizer: gallons, ft³, barrels, lbs, liters, m³,kg
Communication: 4-20mA,relays for Totalizer and alarm output
keypad: 6pcs buttons
Size: Transmitter:235X125X45mm case:410X320X80mm
Weight: 3kg

Transducers Type: Clamp-on
Protection rating: IP65
Max Liquid Temperature:Std. Temp.: -35℃~85℃ for short periods up to 120℃
High Temp.: -35℃~200℃ for short periods up to 250℃
Pipe diameter range: 40-4000 mm
Transducer Size: 60(h)*34(w)*33(d)mm
Material of transducer: Aluminum for standard temp. sensor, peek for high temp. sensor
Cable Length: Std: 5m

Sigma 6000-P series

Portable Flow Meter for Partially Filled Pipes & Open Channels

20 coordinate points to describe the river’s shape of cross section.
One instrument can measure the velocity, depth and conductivity at same time.
Velocity Range : 0.02mm/s to 10m/s bi-directional, accuracy is 1%.
Depth Range: 0 to 10m
Measure velocity in both forward flow and back flow.
Depth is measured by both the pressure sensor and ultrasonic level sensor principles.
With coordinate correction and pressure compensation function.
IP68 Epoxy-sealed body design, long time under water.
RS485/MODBUS output, can contact computer directly.

Power supply: Control unit:220VAC (battery);Sensor:12VDC
IP rating: Control unit: IP66,Sensor: IP68
Operating temperature: 0℃ ~+60℃ water temperature
Control unit Display: 4.5” color LCD
Control unit output: 4-20mA, RS485( Modbus-RTU),Data logger,GPRS
Sensor size: 135mm x 50mm x 20mm (L x W x H)
Applications: Partially Filled Pipes:200-10000mm; Open Channel: 200-10000mm
Flow calculation: Velocity;Totalizer Pipe, Channel type Partially filled pipe, Open Channel and River, Stream
Sensor material: Epoxy-sealed body, Marine Grade 316 Stainless Steel Mounting Bracket
Sensor weight: 1kg with 15m of cable, it can extend o 100m
Velocity range: 20mm/s-0.8m/s; 20mm/s-1.6m/s; 20mm/s-3.2m/s (default); 20mm/s- 6.4m/s; 20mm/s-13.2m/s
Bi-directional velocity measurement capability
Velocity accuracy: ±1% typical
Velocity resolution: 1mm/s
Depth range: Ultrasonic Sensor: 20mm up to 5m above top surface
40mm up to 5m from base
Temperature resolution: 0.1°C
Cable: The standard cable length is 15m, the maximum option is 50m.
Power usage: 10V to 24VDC, 50µA standby, 100mA/s
SDI-12: SDI-12V 1.3recorder (1200 baud smart instrument channel)

Portable/Handheld surface water Flow Meter

Surface Water Flow / Velocity Measurement
for Open channels, Rivers, Streams, Hydrology

A flow meter in a ruged cast-metal exterior and the world’s most sensitive transmitter/receiver as well as miniaturized and modernized electronics. Its direction sensing software and updated algorithms position the Pro II as a new-generation radar ideal for the task of accurate and reliable water flow measurement using Ka Band for superior performance in measuring water flow.
To make it better suited for the different elevated perspectives in comparing water flow at different times or locations, the flow meter utilizes a unique automatic vertical tilt compensation automatically adjusting its
speed reading based on the angle the radar points at the target flow.
With a vertical angle accuracy of ±2° and vertical angle resolution of 1°, if an operator takes one reading pointing down at 45°, then takes another at 50°, both flow readings will be adjusted and directly comparable.

• Automatic vertical tilt compensation
• Units: m/s, cm/s, MPH, km/h, ft/s
• 0.2 m/s - 18.0 m/s range
• ±0.1 m/s accuracy
• Direction sensing
• Ka-Band for greater accuracy

General Specifications
Operating Frequency: 34.7 GHz (Ka-band)
Environmental: Operating: -30°C to +70°C, 90% relative humidity
Mechanical: Weight – 0.52 kg (1.15 lb) Diameter – 6.7 cm (2.6 in.) Length – 11.8 cm (4.7 in.)
Case Material – Aluminum and magnesium die cast
Accuracy: ±0.1 m/s; ±10 cm/s; ±0.22 MPH; ±0.36 km/h; ±0.32 ft/s
Speed Range: 0.2 m/s to 18.0 m/s; 20 cm/s to 1,800 cm/s; 0.4 MPH to 40 MPH;
0.72 km/h to 64.8 km/s; 0.66 ft/s to 59 ft/s
Vertical Angle Accuracy: ±2°
Vertical Angle Resolution: 1°

Factory Configuration
Tilt Sensor: Automatic vertical angle from internal tilt sensor or Selected in Field Configuration settings
Units: m/s (meters/sec), cm/s (centimeters/sec),MPH (miles/hour), km/h (kilometers/hour)
or ft/s (feet per second)
Serial Port: RS-232 and RS-485 simultaneously

Field Configuration
Transmit/Hold: Turns the microwave transmitter On or Off
Radar Zone: Away, Closing or Auto directional sensitivity may be selected
Horizontal Angle: Angles from 0° to 60° may be selected in 5° increments
Vertical Angle: If not configured for automatic vertical tilt angle, angles from 0° to 60° may be
selected in 5° increments
Sensitivity: 4 levels of field sensitivity may be selected (1/2/3/4 max)
Test Mode: Initiates a speed sensor self-test followed by a 60 second tuning fork mode, during
which time directionality screening is disabled and the speed sensor will respond to
any target direction (away or closing) or to non-directional targets (like tuning forks)

111/211 series handheld flow meters

Highly accurate water velocity instruments for measuring flows in streams. The flow meters consist of the protected Turbo-Prop positive displacement sensor coupled by the expandable probe handle to the digital readout display and incorporate true velocity averaging for the most accurate flow measurements. They are ideal for storm water runoff studies, measuring flows in rivers and streams as well as ditches and sewers.

Turbo-Prop Sensor the unique Turbo-Prop propeller sensor uses the most accurate positive displacement technique for velocity sensing. The Turbo-Prop is designed to shed debris and is protected inside a 2" diameter housing. The probe housing may be placed directly on the bottom of pipes or stream beds for measuring low flows down to 50mm (2") in depth. The Turbo-Prop rotates freely on its bearing shaft with no mechanical interconnections for minimal friction. Magnetic material in the propeller tip passes the pickup coil in the housing producing electrical impulses which are carried to the readout display by an internal cable. The Turbo-Prop, the only moving part, is easily removed for cleaning or replacement.

Digital Readout Display The Digital Readout Display receives the electrical signal from the propeller, amplifies it and converts the reading to meters per second (or feet per second). The Readout displays instantaneous velocity and true average velocity. The Readout unit is completely waterproof and incorporates a unique two button operation for changing functions and zeroing the display. Internal watch type battery powers the unit continuously for one year and it is easily replaced. Also available on the Readout are maximum velocity, time-of-day and stop watch.

Probe Handle

The handheld flow meter handle of model 111 is telescoping and is expandable from 1.1... .1.8m in length (3 feet to 6 feet) or 1.7 ... 4.6m (5 feet to 15 feet) with model 211. It is constructed of anodized aluminium for light weight and long life. The flow probe may be easily extended to 25 feet in length using standard PVC pipe and an electrical extension cable. This allows sewer flow measurements from street level and measuring stream flows from the bridge.
True Velocity Averaging The Flow meter uses true velocity averaging. When the Readout is zeroed by pushing both buttons or when the probe is inserted into flowing water, a running average is started. As long as the probe remains in the flow, the averaging continues. Once the average reading becomes steady, the true average velocity has been obtained. When you pull the probe from the water, this average value is frozen on the display until reset.


Range: 0.3-19.9 FPS (0.1-6.1 MPS)
Accuracy: 0.1 FPS
Averaging: True digital running average.  Updated once per second.
Display: LCD, Glare and UV Protected
Control: 4 button
Datalogger: 30 sets, MIN, MAX, and AVG
Features: Timer, Low battery warning
Sensor Type: Protected Turbo-Prop propeller with magnetic pickup.
Weight: Instrument: 2 lbs. (0.9 kg) (Model 111), 3 lbs. (1.4 kg) (Model 211)
Shipping: 13 lbs. (5.9 kg) (Model 111)), 23 lbs. (10.4 kg) ((Model 211)
Expandable Length: 3.7 to 6 ft (1.1 to 1.8 m) (Model 111)); 5.5 to 15 ft (1.7 to 4.6 m) (Model 211)
Probe: PVC and anodized aluminum with stainless steel water bearing
Computer: ABS/Polycarbonate housing with polyester overlay
Power: Internal Lithium Battery, Approx 5 year life, Non-Replaceable
Operating Temperature: -4° to 158° F (-20° to 70° C)
Storage Temperature: -22° to 176° F (-30° to 80° C)
Carrying Case: The Flow Probe is shipped in a padded carrying case.
Approvals: CE