Data Logger for Water MeterFunction Continuously counts pulses from pulse output of the water meter (or other meters with pulse output) and periodically records non-zero values to internal nonvolatile memory for further data transfer to PC.

Features• Input Pulse frequency up to 20Hz with digital

filtering for debouncing cancelation• Isolated input for Reed Switch or Voltage

Pulse• Selectable Recording Period (beginning from

1s with 1s step)• Nonvolatile memory for data storage:a) FRAM (2Mbit for 37400 records)b) microSD card optionally (up to 2Gbit)• Interface with PC for remote data reading:a) Isolated RS-485 interface with selectable

Baud Rate up to 460800 baud/sb) Optional GSM/GPRS communication (TCP/IP)• Data archiving and visualization on the PC• +5…12VDC power supply• Package for DIN rail mounting• Operating temperature range -25…+75℃

Data Logger connection to Meter and PC

RS-485• Bus length up to 1 km• Selectable baud rate up to 460800 baud/s• Virtual COM port

GSM/GPRS• No wires, no distance limitation• Onboard SIM card with connection to

mobile Internet• TCP/IP communication protocol

Block diagram of the Data Logger

Input Circuit

Digital anti debouncing filtering algorithm is implemented in MCU program.

Minimal pulse width is limited at 25ms, that allows pulse rate up to 20Hz.Pulse Input accepts Reed Switch and Voltage Pulses (up to 36V). See figures on the left for more info.Input Circuit protection against reverse polarity of the signal.

IN+

IN-GND

GND

+5V

Pulse

MCU Pulse In

+5V

GND

Operation principles

Recording Period is designated as T on the time diagram above. When this interval expires, non-zero value of the Pulse Counter with time stamp (seconds, minutes, hours, days, weekdays, months, years) are written to the nonvolatile memory. Then Pulse Counter is cleared to start counting pulses for the next recording period.

Recording period selectable from 1s with 1s step.

20-bit Pulse Counter is used for counting pulses.

PC software. Setup and configuration.

Configuration of thevirtual COM port

Setting and readingparameters

Main window

Data visualization. Table and chart formats.

Daily waterconsumption in March

Data Logger recordsIn March

Data archivingon the PC

Data export to Excel

Detailed data representation for short time interval

The same data, but current value is added to the sum of

previous values. The last value is equal to total water

consumption for selected time interval.