Low Flow Flowmeters


Technical Inquiries


JLC International is a global distributor of many different kinds of measurement devices from flowmeters to transmitters. Included are flowmeters capable of measuring very low flow, down to 2 ml/min. Below are three meters that qualify as low flow as well as a totalizer to indicate total flow and flow rate.

Atrato Inline Low Flow Flowmeter

The Atrato inline low flow flowmeter utilizes patented technology, which enables it to operate with excellent accuracy over very wide flow ranges across the whole span. It is a genuine breakthrough in flowmeter technology! Its rugged, clean bore construction makes the Atrato ideal for a whole range of low flow applications, and its USB port allows software connectivity at literally the touch of a button.

The Atrato is a low flow flowmeter that can handle low flows from laminar to turbulent, and is largely immune from viscosity. It has excellent:

  • Turndown
  • Repeatability
  • Linearity
  • Accuracy that is better than ±1.0% of reading.

The USB connection permits the user to directly monitor the rate and total on their laptop while also altering some of the operating parameters, such as the pulse resolution and units.

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The Atrato System

The Atrato system of low flow meters uses the well-proven time of flight measuring method, which is far more reliable and accurate than Doppler shift measurement, wherein, reflected signals are required from irregularities in the liquid. The strong radial ultrasonic signal sends symmetrical pulses directly into the tube; the sound travelling down the pipe can be considered as a plain wave. The signal to noise ratio is remarkable, as there is little background noise and high signal strengths. As the system is fully balanced at zero flows, the two signals are identical and cancel each other out. This gives a very stable zero flow condition and is the basis of the flowmeter’s high-ratio between minimum and maximum flows. As the flow increases, these signals go out of phase, and this phase shift is measured to an accuracy equivalent to 250 picoseconds. In addition, the sound waves travelling down the tube in the Atrato operating system are symmetrical, and as a result, any changes in the fluid’s velocity profile across the pipe diameter will be averaged out by the signal as it passes from the transmitter to the receiver. It is therefore irrelevant whether the fluid velocity profile is fully formed with turbulent flow or completely laminar with a classic parabolic profile. In practice, this gives the Atrato an excellent immunity to Reynolds number changes and a good high viscosity performance.

LMX Low Flow Flowmeter

The LMX low flow flowmeter is very different than any other turbine flow meter, like e.g. beverage flowmeters. The LMX series of low flow meters are manufactured from 316 stainless steel and provide accurate flow measurement down to 4 ml/min. The Pelton Wheel is a single size, straight bladed rotor, manufactured from chemically resistant PFA with sapphire bearings. These bearings run in hemispherical sapphire bearing cups, which form a “floating”, low friction, precise unit. Sealed ferrites are mounted within the tips of the rotor and are sensed by the pick-up sensor suitable for high pressures. The integral upstream/downstream straight lengths ensure the correct flow profile conducive with accurate measurement in the field. With the chemically-resistant materials of construction, combined with their ability to work with pressures up to 230 bar (3336 psi) and temperatures up to 100 °C (212 °F), the LMX series of low flow meters are suitable for most low flow applications. Those who are interested, are encouraged to contact JLC International by calling this number: 1-888-358-2518. We strive to assist you with any of your measurement needs in any variety of industry. Our low flow flowmeters can certainly provide you with an asset you won’t find elsewhere.


Ultra Low and Low Flow Ultrasonic Inline Liquid Flowmeter
Light-Duty Atrato Series 700

low flow meters  


  • Four flow ranges:
    • 0.002 – 0.500 l/min (0.0005 – 0.132 gpm)
    • 0.01 – 1.70 l/min (0.0026 – 0.450 gpm)
    • 0.02 – 5.00 l/min (0.0053 – 1.32 gpm)
    • 0.1 – 20.0 l/min (0.0264 – 5.28 gpm)
  • Accuracy: ± 1.0% of reading
  • Repeatability: ± 0.1% over 25 – 100% of the range
                             ± 0.5% over 0 – 25% of the range
  • Supply voltage: 10 – 24 Vdc
  • Turn-down minimal 200 : 1
  • Temperature rating: -10 – +60 °C (14 – 140 °F)
                                       -10 – +110 °C (14 – 230 °F) optional
  • K-factor adjustable; max. considering flow and frequency
  • Pressure rating: 10 bar (145 psi) / 30 bar (435 psi)
  • Outputs: Pulse NPN / PNP – to replace pulse flowmeters – max. 400 Hz
                       Programmable hardwired relay
                        Analogue 0 – 5 / 10 V or 4 – 20 mA – scalable
  • USB interface for configuration and monitoring
  • Liquid crystal display optional
  • Flow tube materials; PEEK® / 316L Stainless Steel or PEEK® / Glass
  • O-ring Viton or Nitrile, EPDM, Silicon
  • Process connections: 3/8″ John Guest, 1/2″ NPT or 1/2″ BSPP male
  • Bi-directional with indication of positive and negative flow
  • Immune for changes of fluid velocity profile and Reynolds number
  • No moving parts


Ultra Low and Low Flow Ultrasonic Inline Liquid Flowmeter
Industrial Atrato Series 70P




  • Four flow ranges:
    • 0.002 – 0.500 l/min (0.0005 – 0.132 gpm)
    • 0.01 – 1.50 l/min (0.0026 – 0.396 gpm)
    • 0.03 – 5.00 l/min (0.008 – 1.32 gpm)
    • 0.1 – 15.0 l/min (0.0264 – 3.96 gpm)
  • Accuracy: ± 1.0% of reading over 2 – 100% of the flow range
                     ± 2.0% of reading over 0 – 2% of the flow range
  • Repeatability: ± 0.1% + 0.005% of FSD
  • Supply voltage: 8 – 24 Vdc
  • Temperature rating: -10 – +65 °C (14 – 149 °F)
  • Pressure rating: 20 bar (290 psi)
  • Pulse output: NPN and PNP
  • Flow tube materials; PEEK® and 316L Stainless Steel
  • O-ring Viton or Nitrile, EPDM, Silicon
  • Process connections: 1/4″ NPT or BSP female, stainless steel
  • Electrical connections: 4-pin plug, M12 thread
  • Enclosure: 316 Stainless Steel and ABS cover; protection class IP65 / NEMA 4X
  • No moving parts


Extreme Low Flow Pelton Wheel Liquid Flowmeter
Series LMX



  • Flowmeter ranges: 0.0011 up to 17.2 gpm (0.004 to 65.0 l/min)
  • Accuracy: ± 2% of actual reading for 10 – 100% of range
  • Repeatability: ± 0.2 % reading over top 90% of range
  • Pressure ratings: 435, 1450 and 3336 psi (30, 100 and 230 bar)
  • Max. Temperature: 212 °F (100 °C)
  • Viscosity range: up to 10 cPs
  • Wetted parts are 316 SS, Teflon and Sapphire
  • 1/2″ NPT or 8 mm OD tubing


Totalizer/ Flow Rate Indicator for Series LMX
Series 101

101-remote_small (2)  


  • Pulse input from Extreme Low Flowmeter of the LMX series
  • Readout for most engineering units
  • Analogue 4 – 20 mA loop powered and pulse output
  • Wall, pipe or panel mounted
  • 8 – 28 V ac/dc powered
  • Optional: Hazardous Area Installation




Please note: Manual data files can be quite large, please be patient while downloading.
The manuals are for information purposes only and shouldn’t be used for operating the instrument