Arrow Hunter PLUS – Portable HandHeld Clamp-on Flowmeter

The ECHO Arrow Hunter PLUS range of non-invasive flowmeters utilizes Transit-time ultrasonic technology for the accurate flow measurement of clean or dirty liquids in full pipes. The AH+HH is designed for simple portable applications where flow display and data logging are the only requirements. Includes case and mounting straps.



•   Non-invasive flow measurement for clean or dirty liquids

•   Advanced Transit-time Technology with +/- 0.5% Accuracy

•   Measures all metal, composite & plastic pipes 0.4″ – 118″ diameters with or without liners

•   Dual DSP Microprocessor with digital signal noise rejection

•   Wall-mount NEMA 4X enclosure with graphical display

•   Easy to install clamp-on sensors  

The ECHO Arrow Hunter PLUS range of non-invasive flow meters utilize Transit-time ultrasonic technology for the accurate flow measurement of clean or dirty liquids in full pipes.

The AH+HH is designed for portable applications where quick setup and flow testing is the primary requirement.  The unit is simple, light-weight and cost-effective.  It meets and exceeds the measurement performance of any high-priced competitors flow meter on the market today.

The measurement of flow is based on the principle that sound waves are influenced by a flowing medium.  Measurements are made by penetrating the pipe with ultrasound and measuring the  frequency variations and phase shifts of the signals received.  This measuring technique has no effect on the flowing medium. There is no pressure loss in the pipe and no wear on components of the measuring device.

The ultrasonic sensors are clamped onto the outside of the pipe, thus eliminating the need to dismantle the pipe work and interrupt the process.  The AH+HH can be applied to any type of metal or plastic pipe with or without a liner carrying clean or dirty liquids.  We have several transducers to chose from depending on pipe size, process temperature and required hazardous approvals.

ECHO Process Instrumentation offers a 60 day Performance Guarantee!


Technical Specs:  Arrow Hunter PLUS – HandHeld


Measuring principle : Ultrasonic Transit-time
 velocity range 0.03 … 82 ft/s (0.01 … 25 m/s)

Resolution : 0.00082 ft/s (0.25 mm/s)
Repeatability : 
0.15 % of measured value ±0.015 m/s
Accuracy : 
Volume flow :  ± 0.5% factory calibrated (process conditions can reduce accuracy),
 0.5% of measured value with process calibration
                 Flow velocity : ± 0.5 % of measured value
 down ratio : 1/100
Max particulates : 
< 10 % of volume

Flow transmitter

Enclosure : Handheld

Protection rating : NEMA 12 (IP 65 according EN60529)
Operating temp. : 
14 …140 °F (-10 … 60 °C)
Housing material : 
ABS (UL 94 HB)
Flow channels : 
 supply :  Internal rechargeable batteries, 4 x NiMH AA 2850 mAh or 9 VDC external power supply
Display : 
LCD graphic display, 128 x 64, backlight
Dimensions : 8.9
 H x 2.8/4.6 W x 1.8 D inch (228 H x 72/117 W x 47 D mm)
Weight : 
Approx. 1.5 lbs (0.65 kg)
Power consumption: 
< 1 W in measurement mode
Signal damping : 
0 … 99 s
Measurement rate 
10 … 1000 s-1
Operating languages: English, German, French, Spanish
 time : 1 s, faster rates upon request

Quantity and units of measurement

Volumetric flow rate : m3/h, m3/min, m3/s, l/h, l/min, l/s, USgal/h, USgal/min, USgal/s, USMGD, bbl/d, bbl/h, bbl/min, bbl/s
 velocity : m/s, ft/s, inch/s
 flow rate : g/s, t/h, kg/h, kg/min
Volume/ Mass : 
m³, l, US gal, bbl / g, kg, t


Internal data logger

Storage capacity : approx. 30,000 samples (128 kByte), optional > 100,000 samples (512 kByte)
 data : All measured and totalized values


Serial interface : RS 232, (optional RS 485)
Data : 
Instantaneous measured value, parameter set and configuration, logged data

Software AH+ PC Software

Functionality : Downloading of measured values/parameter sets, graphical presentation, list format, export to third party software, on-line transfer of measured data
 systems Windows 2000, NT, XP, Vista, 07

Process outputs

Serial : RS232 only


Clamp-on Sensors


Pipe Diameter range: 0.39 … 9.8 inch (10 … 250 mm)
Dimensions : 
1.7 x 0.7 x 0.8 inch (43x18x22mm)
Material : 
Stainless Steel
Temperature range
 :    Type XTT+SM-HH-ARMOR: -22 … 266 °F (-30 … 130 °C)

Protection rating : NEMA 4X (IP 66 acc. EN 60529), Optional NEMA 6P (IP 68) submersible

Hazardous rating : General Purpose



Pipe Diameter range: 1.96 … 118 inch (50 … 3000 mm)
Dimensions : 
2.3 x 1.2 x 1.3inch (60x30x34 mm)
Material : 
Stainless Steel

Temperature range Type XTT+LG-HH-ARMOR: -22 … 266 °F (-30 … 130 °C)

Protection rating : NEMA 4X (IP 66 acc. EN 60529), Optional NEMA 6P (IP 68)

Hazardous rating : General Purpose


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