pFlow - E3R

• Manufacturer: pFlow
• Product: E3R

The E3R is a LoRaWAN Ultrasonic Heat Flow Meter.

Table of contents

1. Specifications
2. Documents
3. tbd
4. Ordering Info
5. Adding the Device to TTN
6. Optional Settings
   1. Change TDC (Transmit Time Interval resp. Keep Alive Interval)
7. Payload Decoder

Specifications

• indoor device
• Price ca. CHF 350.- (03.06.2025)
• Built-in sensors
  • Water Flow, [m3/h]
• Pipe size range: DN20,DN25,DN32,DN40,DN50,DN65,DN80
• Power Supply: 10-36 VDC/500mA
• LoRaWAN version: 1.0.2
• LoRaWAN device class: A
• Modbus as well available
• Size: tbd
• Weight: tbd

Documents

• tbd

Ordering Info

• tbd

Adding the Device to TTN

• The JoinEUI, App EUI and the DevEUI should be on a sticker on the cardboard box.
• Before a device can communicate via “The Things Network” we have to add it to an application.
  

1. Create a new application
2. Under End devices in the application click (+) Register end device
3. Under Input method select Enter end device specifics manually
4. Under Frequency plan select Europe 863-870 Mhz (SF9 for RX2 - recommended)
5. Under LoRaWAN version select 1.0.2, Regional Parameters version RP001 Regional Parameters 1.0.2
6. Under JoinEUI enter the App EUI from the App and press Confirm
7. Enter as well the DevEUI and the AppKey from the App
8. Set an end-device name
9. Press Register end device
10. Add the payload formatter from below, either to the device itself or if all devices in the app are from the same type, to the application
11. Plug in the device or restart LoRa in Communication settings

• Now the device should join the network and you can see the incoming telegrams in the Live data section

Optional Settings

Change TDC (Transmit Time Interval resp. Keep Alive Interval)

tbd —

Payload Decoder

function decodeUplink(input) {
    var bytes = input.bytes;
    var fPort = input.fPort;
    
    var decoded = {};

    // Uplink payload decoding
    decoded.uplink = readUplinkInfo(bytes);
    
    return {
        data: decoded
    };
}

function readUplinkInfo(bytes) {
    var uplink = {};
    
    uplink["volumeFlow_m3perh"] = readUInt32(0, bytes) / 100;
    uplink["volume_m3_inc"] = readUInt32(4, bytes) / 100;
    uplink["energy_kWh_inc@heating"] = readUInt32(13,bytes) /100;
    uplink["energy_kWh_inc@cooling"] = readUInt32(19,bytes) / 100;
    uplink["temperature_degrC_abs@return"] = readUInt16(11,bytes) / 100;
    uplink["temperature_degrC_abs@flow"] = readUInt16(17,bytes) / 100;
    uplink["velocity_mpers_abs"] = readUInt16(8, bytes) / 100;
    uplink["signalQuality_perc_abs"] = readUInt8(10, bytes);

    return uplink;
}

// helper functions

function readUInt32(index, bytes) {
    var value = (bytes[index] << 24 & 0xff000000) | (bytes[index + 1] << 16 & 0x00ff0000)  | (bytes[index + 2] << 8 & 0x0000ff00) | (bytes[index + 3] & 0x000000ff);
    return value & 0xffffffff;
}

function readUInt16(index, bytes) {
    var value = ((bytes[index] << 8) & 0xff00) | ((bytes[index + 1]) & 0x00ff);
    return value & 0xffff;
}

function readUInt8(index, bytes) {
    var value = ((bytes[index]) & 0xff);
    return value & 0xff;
}