Need assistance? Call us: 1-800-663-4209
KW1850
Power Meter
- High-density energy monitoring: KW1850 meters monitor up to 18 single-phase circuits or 6 three-phase circuits in one compact DIN-rail device.
- Ideal for sub-metering and billing: Designed for multi-tenant buildings, commercial complexes, apartments, data centers, industrial facilities, LEED projects, and branch circuit monitoring.
- Accurate performance: 0.5 class accuracy supports dependable measurement of energy, voltage, current, power, demand, frequency, power factor, and harmonics.
- Advanced power quality insight: Tracks THD, individual harmonics, current K-factor, crest factor, voltage unbalance, and current unbalance for better system visibility.
- Flexible communications: Supports RS-485 Modbus RTU and BACnet MS/TP, with Ethernet, Wi-Fi, Modbus TCP, BACnet IP, SNMP, MQTT, HTTP/HTTPS, FTP, SMTP, and NTP available on select models.
- Installer-friendly CT connections: Snap-on CT technology helps reduce polarity errors, wiring configuration time, and installation complexity.
- Built-in logging and alarms: Stores system events, historical trend data, and over/under limit alarms with 8MB or 8GB memory depending on model.
- Multi-utility integration: Includes 18 digital inputs for water and gas meter pulse counting, plus 6 digital outputs and 2 relay outputs for broader energy management applications.
- Local and software setup: LCD display, five-button keypad, and Accuview software simplify configuration, readings, and advanced meter functions.
- Rugged installation options: Standard 35 mm DIN rail mounting is available, with optional NEMA 4X/IP66 panel upgrade for prewired, protected installations.
Product Overview
- Accuracy 0.5 Class
- Applications Building and Maintenance, Control Panel, Environmental Monitoring, Industrial and Manufacturing, Refrigeration Equipment
- Approvals UL 508A, EN62208
- Baud Rate 1200 to 115200
- Compliance Note UL 746C 5-inch flame test
- Connection Note DIN rail mounted pre-labeled terminal blocks for voltage connection pre-installed
- Control Output Alarm
- Data Format 8 data bits:no parity:1 stop bit
- Data Interface Note RS-485 Serial, Dual Ethernet (KW1850-P1-D-W Only), Wireless Network Card (KW1850-P1-D-W Only)
- Display Type LCD
- Enclosure Material Flame retardant polycarbonate
- Enclosure Ratings IP66, NEMA Type 4X
- Frequency 45/65Hz
- Frequency Note Pulse Frequency (MAX):100Hz, 50% Duty Cycle
- Fuse Rating 600 VAC/2A
- Height 7.01 in
- Impedance Input 2MΩ/Phase
- Inductive Loads <0.2VA
- Input Control Signal 15 to 30 Vdc
- Input Current 2 mA
- Input Note Digital Inputs / Type: 18 Digital Inputs for Water and Gas Metering Pulse Counting / Dry Node; Acceptable CT Inputs: 333mV or Rogowski Coil (cannot mix CT’s);
- Isolation 4000 Vac
- Length 11.81 in
- Load Current, Max 3 A
- Load Voltage, Max 30 V
- Materials Polycarbonate
- Measurement Type Single Phase, 3 Phase – Four Wire (WYE), 3 Phase – Three Wire (Delta)
- Mounting ANSI C39.1 (4" Round) or an IEC 92mm DIN (Square) form; IEC 35mm DIN Standard
- Network and Communications Modbus Address Range:1 to 247 (The default is 1)
- Number of Inputs 18
- Operating Distance, Max 1200 m
- Operating Humidity 5 to 95% RH, non-condensing
- Operating Temperature, Max 158 °F
- Operating Temperature, Min -13 °F
- Output Detail Ten limit alarms configured for peak demand, current, or power quality; Auxiliary Power Output: 15VDC, 1W; Pulse Output: Two-wire pulse train, Isolation Voltage 2500VAC, 0-30 VDC Load Voltage, 10mA Max Load Current, Pulse Width 20~100ms (80ms Default), Pulse Constant 1~60,000 (50000 Default) IMP/kWh
- Power Consumption 5 W
- Relay Output 250 Vac
- Response Time 2 ms
- Security Password Protected to access Settings. Sealed and Tamper Proof Cover
- Series ID KW1850
- Software Accuview Utility Software, Windows Based. USB-RS485 converter is required to connect to computer for KW1850-P1-D-S only
- Storage Temperature, Max 185 °F
- Storage Temperature, Min -40 °F
- Supply Voltage 100 to 415 Vac, 100 to 300 Vdc
- Volt-Amperes Burden <0.2VA
- Voltage Measurement Range 100 to 400 Vac (L-N), 100 to 690 Vac (L-L), 100 to 400 Vac rms (1 phase)
- Weight 8 lb
- Width 11.81 in
- Wire Gauge 22 to 16 AWG
- Working Life Multi-Tariff Time of Use (TOU): 4 tariffs (sharp, peak, normal, valley), 14 schedules, 14 segments, weekends and 10-year holiday settings
Supported Applications
The ACI KW1850 Smart Metering System is a multi-channel energy meter designed for monitoring electrical parameters including voltage, current, power (active, reactive, apparent), energy (kWh, kVARh, kVAh), demand, frequency, power factor, and harmonics. The device features a built-in LCD display with a 5-key navigation pad and supports wireless communication via an external antenna. It is intended for use in commercial and industrial applications for energy management and monitoring.
Operating Conditions & Performance
The KW1850 operates within an ambient temperature range of -20°C to +70°C with a humidity rating of 5% to 95% RH (non-condensing). Storage conditions are specified as -40°C to +85°C. The unit is housed in a black plastic enclosure with an IP30 rating and measures 140mm (W) x 100mm (H) x 70mm (D).
Measurement capabilities cover the following ranges:
- Voltage: 300~300V, 400~400V, 480~480V, 600~600V
- Current: 0~5A, 0~10A, 0~20A, 0~30A, 0~50A, 0~100A, 0~200A, 0~300A, 0~500A, 0~1000A
- Power: 0~1000kW
- Energy: 0~999999.9kWh (resolution 0.1 kWh)
- Frequency: 45~65Hz
The device meets accuracy class CL.0.5S with specific accuracies of ±0.2% for voltage and current, and ±0.5% for power and energy.
Voltage & Current Ranges
- Supported Voltage: 300~300V, 400~400V, 480~480V, 600~600V
- Supported Current: 0~5A through 0~1000A (via CTs)
Accuracy & Resolution
- Voltage Accuracy: ±0.2%
- Current Accuracy: ±0.2%
- Power Accuracy: ±0.5%
- Energy Accuracy: ±0.5%
- Energy Resolution: 0.1 kWh
Environmental Limits
- Ambient Operating Temperature: -20°C to +70°C
- Storage Temperature: -40°C to +85°C
- Humidity: 5% to 95% RH (non-condensing)
- Enclosure Rating: IP30
Configuration Options
The KW1850 series supports various configuration options including external antennas for wireless communication, Current Transformers (CTs) for different current ranges, mounting brackets, and ACuView software for configuration and monitoring. Electrical connections are made via a terminal block with screw connections.
Communication & I/O
- Primary Interface: RS-485 (Modbus RTU)
- Wireless Option: External antenna support
- Relay Outputs: 2x SPDT
- Digital Inputs: 2x
- Digital Outputs: 2x
Power Supply & Approvals
- Supply Voltage: AC 85~265V, 50/60Hz
- Certifications: CE, RoHS
Key Product Differences
The series includes specific model configurations identified by part numbers such as KW1850-P1-D-S and variants with wireless capabilities (e.g., -W suffix) or additional accessories. The device supports Modbus RTU communication via RS-485, utilizing function codes for reading relay status, digital input status, data registers, and writing to single or multiple registers.
Modbus address mapping includes parameters such as Voltage L1-L3 (0x0000–0x0002), Current L1-L3 (0x0003–0x0005), Active Power per phase and total, Energy in kWh, Demand, Frequency, Power Factor, Relay Output Status, Digital Input Status, Device ID, and Firmware Version.
PDFs & Manuals
Show Ratings & Reviews
