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Industrial Wireless Three Phase Current Meters

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        • Sugar Production
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Home > Food & Dairy > Data Acquisition & Logging > Industrial Wireless Three Phase Current Meters
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General Description

The ALTA Industrial Wireless Three Phase Current Meter measures the RMS current of an alternating current (AC) system using 3 current transformers (CTs) that wrap around the wires of a three phase power system. The sensor reports Minimum RMS current, maximum RMS current, average RMS current, and duty cycle for each phase and the combined amp hours of all three phases to the iMonnit system. The iMonnit system is capable of generating watt hour or kilowatt hour readings as well based on a user specified RMS voltage.
• Measures amp hours, max RMS current, min

RMS current, average RMS current, and duty cycle for each phase and combined amp hours from all three phases
• 3 x 0-150 amp current transducers
• Capable of generating watt hour or kilowatt hour readings using iMonnit
• Data logging for accumulated amp hour readings
• Can notify based on current levels
• Simple and safe installation of current/power measurement hardware, no rewiring required

 

Principle of Operation

To measure current, clip the CT around only a single wire of a powered system (clipping around a hot and neutral wire at the same time will result in 0 current readings). After the sensor powers on and connects to the gateway it will begin taking measurements based on the averaging interval (5 seconds default). It will report data to iMonnit every heartbeat or if the current goes outside of the aware thresholds set in iMonnit. The sensor reports average current, max RMS current, min RMS current, and duty cycle for each phase and amp hours for all three phases combined. iMonnit can also generate watt hour or kilowatt hour readings if a default RMS voltage is set in iMonnit.

Features of Monnit ALTA Sensors
• Wireless range of 1,200+ feet through 12+ walls *
• Frequency-Hopping Spread Spectrum (FHSS)
• Improved interference immunity
• Improved power management for longer battery life **(12+ years on AA batteries)
• Encrypt-RF® Security (Diffie-Hellman Key Exchange+AES-128 CBC for sensor data messages)
• Onboard data memory stores up to 512 readings per sensor:
– 10-minute heartbeats = 3.5 days
– 2-hour heartbeats = 42 days
• Over-the-air updates (future proof)
• Free iMonnit basic online wireless sensor monitoring and notification system to configure sensors, view data and set alerts via SMS text and email
*Actual range may vary depending on environment.
**Battery life is determined by sensor reporting frequency and other variables. Other power options are also available.

ALTA Industrial Wireless Three Phase Current Meter | Technical Specifications

Supply voltage 2.0–3.8 VDC (3.0–3.8 VDC using power supply) *
Current consumption 0.2 µA (sleep mode), 0.7 µA (RTC sleep), 570 µA (MCU idle),
2.5 mA (MCU active), 5.5 mA (radio RX mode), 22.6 mA (radio
TX mode)
Operating temperature range (board circuitry and battery) -40°C to +85°C (-40°F to +185°F) **
Included battery Max temperature range -40°C to +85°C (-40°F to +185°F)
Capacity 1500 mAh
Optional solar feature Solar panel 5VDC/30mA (53mm x 30mm)
Charging temperature range 0°C to 45°C (32°F to 113°F)
Max temperature range -20°C to 60°C (-4°F to 140°F)
Included rechargeable battery 600 mAh/>2000 charge cycles (80% of initial capacity)
Solar efficiency Optimized for high and low-light operation ***
Integrated memory Up to 512 sensor messages
Wireless range 1,200+ ft non-line-of-sight
Security Encrypt-RF® (256-bit key exchange and AES-128 CTR)
Weight 28.7 ounces
Enclosure rating NEMA 1, 2, 4, 4x, 12 and 13 rated, sealed and weather proof
UL rating UL Listed to UL508-4x specifications (File E194432)

 

Current Transformer Specifications
Number of current transducers 3 per sensor (3 ft wires)
Absolute max CT current 200 Amps RMS (Arms)
Maximum accurate CT current 150 Arms
Frequency range 50–100 Hz
Accuracy +/- 2% @ 2 to 150 Arms, +/- 0.4 Arms @ < 15 Arms ****
Calibrated accuracy with appropriate offset +/- 1% @ 2 to 150 Arms, +/- 0.2 Arms @ < 2 Arms ****
Offset limits -1.27 to + 1.27 Arms (default set to +0.3 Arms) *****
Measurement resolution Average: 0.01 Arms
Max: 1 Arms
Min: 1 Arms
Duty: 1%
Amp Hours: 0.1 Amp Hours
Current transducer dimensions 67 mm x 49 mm x 42 mm (24 mm inner diameter)

Example Interfacing

• Current monitoring
• Current usage
• Amperage monitoring
• Amp hour meter

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