SL1438B Battery Powered Ultrasonic Flow Meters

Ultrasonic SL1438B is a battery powered ultrasonic flow meters and features micro-power consumption and super low start-up flow rate. The high-performance long life battery, the micro-power consumption circuits and the high-efficiency electroacoustic converter makes it possible to measure out doors where no power supply is available.

Suitable fluids

SL1438B Ultrasonic Flow Meters It is suitable for a single liquid medium, without much impurity, particles, suspended solids or air bubbles, and for full pipe f low measurement.  SL1438B Ultrasonic Flowmeters can be widely used and is suitable for any acoustic conductive fluids measurement.


  • Water supply
  • Waste water treatment
  • Industrial process water
  • Cooling or heating water
  • Others


  • Super low start – up flow rate : 0 . 005m / s
  • Micro-power design, Power consumption ﹤0. 5 mw
  • Battery-powered (the battery can continuously work for 8 t o 10 years
  • Data storage vi a EEPROM, can record the total i zed flow data of  the previous 64 working days, previous 64 working months and  the previous 5 working years; data is permanently saved after powering off .

SL1438B Ultrasonic flow meter Technical Specifications

  • Transmitter:
    • Accuracy : ± 1. 0% of reading (±0. 5% for option)
    • Repeatability : ± 0. 3%
    • Flow range : ± 0. 03 to ±23 ft / s (±0. 01 to ±7 m/ s)
    • Power supply : internal battery(3. 6 v/ 19. 8 Ah )can continuously work 8 to 10 years, or 10 ~ 36 VCD external power supply can be used to power it .
    • Explosion Proof  rate :  Ex (ia) ⅡB T4
    • Protecting rate : I P65
    • Operation temperature :
      • Transmitter : – 50 F~+140 F(-10 C~+60 C), humi di t y≤85%
      • Transducer : – 40 F~+176 F(-40 C~+80 C)
    • Display : 8 -digit LCD display for prompting and display instantaneous flow, total flow, total operation time, date etc.
    • Keyboard
      • Magnetic induction key
      • Storage : Data storage via EEPROM, can record the total flow data and the data can be permanently saved after powering off.
    • Communication : RS-485 accumulate pulse (10~36 VDC)
  • Transducer of SL1438B ultrasonic flow meters :
    • The max pressure : 1.6 MPa
    • Fluid temperature :  4 °C ~ 50°C
    • Meter body material :Carbon Steel
    • Protection rate : IP65
    • Power consumption: <0. 5mw

Installation requirements

  • Install the SL1438B ultrasonic flow meter on the horizontal and vertical pipes. Make sure the pipe is full of  liquid.
  • Before installing the SL1438B ultrasonic flow meter, clean the pipe surface.
  • Straight pipe section of the same diameter D as the meter, having length of 10 D and 5 D shall be installed upstream and downstream of t he meter respectively.
  • The two transducers should be mounted at the pipe’ s center line on horizontal pipes.
  • Make sure that t he transducer mounting direction is parallel with the flow


Ultrasonic in line Flow meter installation

There are two kinds of SL1438B battery powered ultrasonic flow meter – compact type & remote type. Please refer to the corresponding dimension drawing before installing the meter and connect with the matched flanges.

  • Installation dimension drawing
  • Compact type installation dimension drawing

  • . Remote type installation dimensi on drawing