Smart 3 Phase Power Energy Meter (PEM-3000)
Features
PEM-3000 can measrue 3 phase 4-wire AC (1) Voltage A, B, C: 110V, 220V and 380V AC, (2) Current A, B, C: 0 ~ 100A, (3) Total Active Power (W), (4) Total Reactive Power (Var), (5) Total Apparant Power (VA), (6) Power Factor (PF), (7) Total Active Energy (kWh) and (8) Total Reactive Energy (kVarh)
PEM-3000 can transmit the measured values using (1) MQTT/WiFi, (2) WiFi and (3) LoRa techniques. Method (1) sends MQTT messages to the remote MQTT broker directly. Methods (2) requires MQTT server and method (3) requires LoRa MQTT Gateway to relay the received messages to the MQTT Server. Messages processed in the MQTT Server can be displayed in the remote PC monitor via a private VPN link.
WiFi
LoRa
Hardware Features
PEM (Power Energy Module)
WiFi Specification
LoRa Specification
Power Supply
Measure 3 phase Voltage, Current, Active/Reactive (Power and Energy), PF
IEEE 802.11b/g/n
433MHz, BW 125KHz, SF 10
DC 12V
Software Features
Message Protocol
Push Notification
MQTT, JSON, IFTTT, Webhook (Supported by Gateway/Server)
LINE Notify (Supported by Gateway/Server)
Current Coil
Current Coil (high Amps)
LoRa Antenna
Current coil is used to measure current from 0 ~ 100 Amps. Coil ratio is 1000:1.
High Amps current coil with coil ratio of 1:2000 or 1:3000 to measure up to 200A or 300A currents.
433 MHz Antenna with antenna gain 5/7 dB.
PEM-3000 with LoRa
PEM-3000 LoRa signal consists of sensor device name (PEM), ID number (P1 ~ Pi), Sequence number, each measured item name (Voltage, current, power, frequency, energy) and the associated data consecutively in JSON format. LoRa signals from each PEM-3000 are transmitted to the LoRa Gateway (LRMQ-1000).
LRMQ-1000 encapsulates the received LoRa signal into MQTT format with a predefined Topic and then retransmit the MQTT signal to the MQTT server (MQSVR) using 2.4 GHz WiFi for further processing.
MQTT Server parses each received MQTT messages into voltages (A, B, C), currents (A, B, C), total active power, total reactive power, total apparant power, power factor, total active energy and total reactive energy for each individual PEM-3000 device. The processed values can be displayed in the remote PC monitor as shown in the figure.
