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M1 Lite - Basic Water Meter

Seth Taylor
Updated

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APPLICATION

Ultrasonic water meter M1 Lite is designed for
accurate measurement of water consumption in households, apartment buildings and small commercial premises, where low flow sensitivity is important.

  • Static flow measurement - no moving parts, no wear and tear
  • Very high metering accuracy
  • Eliminates measuring deviations caused by sand, suspended particles or air pockets
  • Long-term measurement stability and reliability
  • 9 digits, multi-line LCD. Total volume and instantaneous flow rate indication at the same time

TECHNICAL FEATURES

  • Sensitive in low flows – starting flow as low as 0.01 gpm
  • Maintenance free device, battery lifetime > 16 years
  • Installation in any position
  • No straight piperun needed
  • No measurement of air
  • IP68 protection class
  • Bi-directional flow measurement
  • Durable composite body
  • Measurement units: Gal-GPM, cubic feet - cubic feet/h
  • Strainer and check valve (optional)
  • Integrated LoRa WAN communication, US902-928 MHz band
    • Radio will wake up and transmit data after 3 gallons of water has flowed through the unit.
    • It may take up to 8 hrs to see the first collection of data in portal.kairoswater.io

DATA REGISTRATION

  • Total volume
  • Forward volume
  • Reverse volume
  • Maximum flow rate value and date
  • Minimum flow rate value and date
  • Operating time without an error
  • Operating time
  • Error code
  • Water temperature indication

DATA LOGGER - HISTORY VALUES

Hourly, daily, monthly values of the measured parameters are stored in internal memory.

LCD INDICATIONS AND ALARM

  • Flow direction indication
  • Battery level indication
  • Leakage
  • Burst
  • Backflow
  • Empty pipe
  • Radio communication
  • Warning indication
  • Low temperature warning

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TECHNICAL DATA

Flow sensor sizes ¾“ x 7 ½“ / 1“x 10 ¾“ / 1 ½“ x 12 5/8“ *
Flow measurement New meter measurement accuracy is within the following limits:
± 1.5% over the normal flow range
± 3.0% from the extended low flow range to the minimum flow value
Measured Fluid Temperature Range 33°F to 194°F (0.1°C to +90°C)
According to AWWA C715-18, measurement accuracy is maintained
at water temperatures up to 80° F (+27° C)
Storage Temperature (empty flow sensor) -13 …158° F (– 25…70° C)
Protection class [IP] IP68
Installation Indoors or outdoors
Battery 3.6-volt lithium thionyl chloride

 

SPECIFICATIONS

M1 LITE meter size ¾“ short 1“ 1 ½“
Size Designation x Lay Length ¾“ x 7 ½“
(20 x 190 mm)		 1“ x 10 ¾“
(25 x 273 mm)		 1 ½“ x 12 5/8“
(40 x 324 mm)
Operating Range 0.15 … 30 gpm
(0.034 ... 6.8 m³/h)		 0.3 … 50 gpm
(0.068 ... 11.4 m³/h)		 0.6 ... 100 gpm
(0.163 ... 22.7 m³/h)
Extended Low-Flow Rate 0.044 gpm
(10 l/h)		 0.11 gpm
(25 l/h)		 0.275 gpm
(62.5 l/h)
Maximum Continuous Operation
(Safe Maximum Operating Capacity)		 30 gpm 50 gpm 100 gpm
Pressure Loss 3.6 psi at 15 gpm
(0.25 bar)		 2.3 psi at 25 gpm
(0.16 bar)		 2.3 psi at 50 gpm
(0.16 bar)
Max Ambient Humidity 0% to 100% condensing
Maximum Operating Pressure of Meter Housing 232 psi (16 bar)
Register Type Straight reading, permanently sealed two line LCD;
digits are 0.33 in. (8.3 mm) high
Register Display
  • Consumption (US gallons or cubic feet)
  • Flow rate (US gallons per minute or cubic feet per hour)
  • Alarms and error codes (if any)
  • Flow direction indicator
  • Radio activity indicator
Register Capacity
  • 999,999,999 gallons
  • 999,999,999 cubic feet
Display Resolution in TEST mode
  • Gallons: 0.XXX
  • Cubic feet: 0.XXX

Certifications

  • NTEP Certification of Conformity #: 22-032 (available in Kairos OneDrive)
  • Fire rating: Untested

 

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