Omega ALTA Specification

Monnit ALTA

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Industrial Wireless Three Phase Current Meters

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 specied 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

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 (Di󰀩e-Hellman Key Exchange
+ AES-128 CBC for sensor data messages)

• All ALTA sensors now have up to 3200 readings:

- 10-minute heartbeats = 22 days

- 2-hour heartbeats = 266 days

• Over-the-air updates (future proof)

• Free iMonnit basic online wireless sensor monitoring

and notication system to congure 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.

Wireless Range Comparison

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.

PAGE 1

ALTA Industrial Wireless Three Phase Current Meter | Technical Specications

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 e󰀩ciency Optimized for high and low-light operation ***

Integrated memory Up to 3200 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 specications (File E194432)

Certications 900 MHz product; FCC ID: ZTL-G2SC1 and IC: 9794A-G2SC1.

Industry
Canada

868 and 433 MHz product tested and found to comply with: EN
300 220-2 V3.1.1 (2017-02), EN 300 220-2 V3.1.1 (2017-02)

and EN 60950

Current Transformer Specications

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 o󰀨set +/- 1% @ 2 to 150 Arms, +/- 0.2 Arms @ < 2 Arms ****

O󰀨set 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)

Hardware cannot withstand negative voltage. Please take care when connecting a power device.

*

At temperatures above 100°C, it is possible for the board circuitry to lose programmed memory.

**

Light present 25% of day yields 125% of operating power to support 10-minute heartbeats.

***

CTs are inherently less accurate at or below 10% of max range. For best calibration results, calibrate at a current between 30% and 90% of max

****

accurate range.

O󰀨set is used to overcome a diode voltage drop inherent to the hardware. To accurately account for this drop a default o󰀨set is used. To best

*****

identify the optimal value of this o󰀨set make a series of measurements at 0.2 to 2 Arms and nd the current (Arms) di󰀨erence between your

measurement standard and the Monnit sensor.

PAGE 2

Three Phase Current Meter Enclosure Dimensions

2.559 in
(90.678 mm)

7.07 in

(179.603 mm)

4.528 in

(139.700 mm)

4.528 in

(139.700 mm)

2.559 in
(90.678 mm)

7.07 in

(179.603 mm)

Example Interfacing

• Current monitoring

• Current usage

• Amperage monitoring

• Amp hour meter

1.579 in
(41.300 mm)

Industrial Grade Sensors | Type 1, 2, 4, 4X, 12 and 13 NEMA Rated Enclosure

Monnit’s Industrial sensors are enclosed in reliable, weatherproof NEMA-rated enclosures. Our NEMA-rated enclosures
are constructed for both indoor or outdoor use and protect the sensor circuitry against the ingress of solid foreign objects

like dust as well as the damaging e󰀨ects of water (rain, sleet, snow, splashing water, and hose-directed water).

• Safe from falling dirt

• Protects against wind-blown dust

• Protects against rain, sleet, snow, splashing water, and hose-directed water

• Increased level of corrosion resistance

• Will remain undamaged by ice formation on the enclosure

For more information about our products or to place an order, please contact

our sales department at 801-561-5555.

Visit us on the web at www.monnit.com.

Monnit, iMonnit, ALTA, Encrypt-RF and all other trademarks are property of Monnit, Corp.

© 2019 Monnit Corp. All Rights Reserved.

Monnit Corporation
3400 South West Temple

Salt Lake City, UT 84115
801-561-5555

www.monnit.com

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