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SRX3 | Multi-Channel AC Current Logger
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SRX3 | Multi-Channel AC Current Logger

The SRX3 AC Current Data Logger is designed for long-term recording of electrical load profiles across single- or three-phase systems. By capturing current usage over time, it allows users to analyze trends, perform load studies, and verify circuit or equipment capacity. The logger and its clamp-on current probes operate as a completely self-powered system, eliminating the need for external power supplies, voltage taps, or auxiliary wiring. Its compact design allows the logger to be easily installed inside electrical panels and other tight spaces. ACR’s clamp-on probes — available in 10 A, 25 A, 50 A, 250 A, 500 A, and 1000 A ranges — allow current measurements to be recorded without shutting down equipment, disconnecting conductors, or disturbing wiring, making installation fast, safe, and non-intrusive. The SRX3 is ideal for energy audits, equipment monitoring, HVAC diagnostics, and electrical capacity assessments.

Key Features

  • Purpose-built for AC current logging — optimized for energy audits, load studies, HVAC systems, and compressor monitoring.
  • Clamp-on probe compatibility — works with ACR’s CT-series probes (10 A – 1000 A AC) for safe, non-intrusive current measurement.
  • Long-life power — onboard lithium logger battery provides up to 10 years of typical operation. (Battery life depends on logging interval, operating temperature, and usage conditions - Warranty is three years).
  • Clamp-on current probes derive their operating signal directly from the magnetic field around the conductor, requiring no external power or voltage connections
  • High resolution — 16-bit analog-to-digital conversion provides precise, detailed current profiles.
  • Large data capacity — stores up to 1 million readings, suitable for extended studies or multi-week deployments.
  • Easy reporting — compatible with TRX Basic and TRX Pro software for setup, graphing, and export to CSV, XLS, or PDF.
  • Rugged and compact — small footprint for mounting inside panels or enclosures.
  • Magnetic mounting — integrated high-strength magnets allow the logger to be securely mounted to electrical panels and other metal surfaces
SKU: 02-0060
$949.00 USD

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Description Specifications Software Documentation Q&A

SRX3: Designed for Real-World Current Monitoring

The SRX3 AC Current Data Logger combines precision measurement with practical field usability. Built for professional energy auditors, HVAC specialists, and electrical engineers, it provides a clear picture of how electrical loads behave over time — from branch circuits to high-capacity three-phase systems.

The SRX3 forms a completely self-powered monitoring system. The logger operates from a long-life internal battery, while the clamp-on current probes (from 50 to 1,000 A AC) derive their power directly from the conductors being measured. No external power supplies, voltage taps, or dangling cables are required, allowing for quick and clean installation inside electrical panels.

Typical Applications

  • Energy Audits – Profile real-world energy consumption and identify efficiency opportunities.
  • 30-Day Load Studies – Record current over time to support system design, demand analysis, or capacity planning.
  • HVAC Testing & Balancing (TAB) – Measure all three phases of fan or pump motors to confirm loading, detect imbalance, and correlate electrical draw with airflow or pressure data.
  • Startup & Long-Term Equipment Analysis – Track current behavior during commissioning and ongoing operation to detect anomalies before they become failures.
  • Plug Load & Lighting Circuits – Assess the performance and duty cycle of smaller loads, from office equipment to lighting banks.
  • Compressor & Motor Monitoring – Verify actual operating loads against nameplate ratings.
  • Baseline & LEED Studies – Collect traceable current data to support sustainability documentation.

Flexible by Design

Each SRX3 supports up to seven analog inputs, allowing simultaneous monitoring of three-phase current plus auxiliary signals such as temperature, pressure, or voltage. Configurable equations in TRX Basic or TRX Pro software let users easily scale readings to engineering units and generate ready-to-share reports in CSV, XLS, or PDF format.

Specifications

Alarm Connector Critical and Warning connections
Maximum 15V
Maximum 350mA
Battery 3.6V Lithium
Typical battery life: 10 years under normal operating conditions @ 25°C
Channel 0 - Internal Temp Resolution: 0.01°C
Range: -40°C - 85°C
Accuracy: ± 0.3°C (0C to 70C)
Accuracy: ± 1°C (-40C to 85C)
Channels 1 to 7 - DC Voltage Input Impedance: ~ 1 Megohm
Resolution: 16-bit
Range: 0 – 5V DC
Accuracy: ± 0.5% Full Scale
Clock Accuracy ± 1 seconds per day
LED Status & Alarm Lights High & Low thresholds per channel
Latch / Self-reset
Memory Size 1 Million Readings
Operating Limits -40°C to 85°C (-40°F to 185°F)
0 to 95% RH non-condensing
Sample Rates 10s to 24 hours (normal mode)
50 ms to 10 s (powered fast mode)
Sampling Methods Continuous (first-in-first-out) / Stop when full
Immediate start / Delayed start - up to 2 months
Spot / Averaged Readings
Size 111 mm (4 3/8") x 74mm (2 15/16") x 27 mm (1 1/16")
Status Indicator Flash rate: 10 seconds
Green: logging
Blue: delayed start
Yellow: alarm warning
Red: critical alarm
Magenta: memory full
Weight 140g (5 oz)
Warranty 3 Years

Software

ACR software tools are intuitive and flexible, allowing you to easily configure ACR data loggers to collect the data you need. Once downloaded, your data is displayed in presentation-quality graphs and can be converted into popular formats for use with spreadsheet programs, document editors, and other third-party applications.

Documentation

For a product sheet, please click below for a pdf version.

Product Sheet

Q&A

Q: Does the SRX3 require rewiring or interrupting power to install probes?

A: No. When used with clamp-on current transducers, installation is completely non-intrusive. You simply clamp the transducer around the conductor — no disconnecting wires or shutting down equipment.

Q: Can the SRX3 detect phase imbalance?

A: Yes. By measuring all three phases simultaneously, you can compare current draw across each leg to identify imbalance, overloads, or improper loading on motors or compressors.

Q: What software do I need to use the SRX3?

A: The SRX3 works with TrendReader TRX Basic (included) or TrendReader TRX Pro. Both support setup, downloading, graphing, custom equations, and exporting data to CSV, Excel, or PDF.

Q: What’s the difference between a current logger and a run-time counter?

A: Run-time counters only record how long equipment is running. The SRX3 records how hard the equipment is working by capturing actual current draw over time. This reveals load patterns, cycling issues, inefficiencies, and imbalance that run-time meters cannot detect.

Q: Can I use other current probes with the SRX3?

A: Yes. The SRX3 accepts any AC current transducer that outputs a 0–5 V DC signal proportional to current. While ACR’s own clamp-on current transducers (10 A to 1000 A) come with predefined scaling equations in the TRX software for quick setup, you can also use third-party transducers. If you are using a non-ACR transducer, simply enter a custom scaling equation in TRX Basic or TRX Pro to convert the transducer’s voltage output into the correct current range. This allows the SRX3 to support virtually any properly ranged 0–5 V current sensor.

Tip: Choose a transducer whose range closely matches the maximum current you expect to measure—typically around 1.5× the anticipated load for best resolution.

Q: Can I create custom equations for other probes in
TrendReader TRX Basic software?

A: Yes. TRX Basic allows you to create custom linear scaling equations for third-party current transducers. Since AC current transducers output a linear 0–5 V signal proportional to the measured current, you can easily convert that voltage into amps by entering a simple linear equation (slope and offset) in the channel setup. This makes it straightforward to use non-ACR probes with the SRX3, provided their output is linear and within the 0–5 V input range.

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Translation missing: en.general.search.loading
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Designed for Real-World Current Monitoring\u003c\/h2\u003e\n\u003cp\u003eThe SRX3 AC Current Data Logger combines precision measurement with practical field usability. Built for professional energy auditors, HVAC specialists, and electrical engineers, it provides a clear picture of how electrical loads behave over time — from branch circuits to high-capacity three-phase systems.\u003c\/p\u003e\n\u003cp\u003eThe SRX3 forms a completely self-powered monitoring system. The logger operates from a long-life internal battery, while the clamp-on current probes (from 50 to 1,000 A AC) derive their power directly from the conductors being measured. No external power supplies, voltage taps, or dangling cables are required, allowing for quick and clean installation inside electrical panels.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnergy Audits\u003c\/strong\u003e – Profile real-world energy consumption and identify efficiency opportunities.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-Day Load Studies\u003c\/strong\u003e – Record current over time to support system design, demand analysis, or capacity planning.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVAC Testing \u0026amp; Balancing (TAB)\u003c\/strong\u003e – Measure all three phases of fan or pump motors to confirm loading, detect imbalance, and correlate electrical draw with airflow or pressure data.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStartup \u0026amp; Long-Term Equipment Analysis\u003c\/strong\u003e – Track current behavior during commissioning and ongoing operation to detect anomalies before they become failures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlug Load \u0026amp; Lighting Circuits\u003c\/strong\u003e – Assess the performance and duty cycle of smaller loads, from office equipment to lighting banks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressor \u0026amp; Motor Monitoring\u003c\/strong\u003e – Verify actual operating loads against nameplate ratings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBaseline \u0026amp; LEED Studies\u003c\/strong\u003e – Collect traceable current data to support sustainability documentation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eFlexible by Design\u003c\/h3\u003e\n\u003cp\u003eEach SRX3 supports up to seven analog inputs, allowing simultaneous monitoring of three-phase current plus auxiliary signals such as temperature, pressure, or voltage. Configurable equations in TRX Basic or TRX Pro software let users easily scale readings to engineering units and generate ready-to-share reports in CSV, XLS, or PDF format.\u003c\/p\u003e"}