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SRX3 | Multi-Channel AC Current Logger
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The SRX3 AC Current Data Logger is designed for detailed measurement of electrical load profiles across single- or three-phase systems. It works with ACR’s clamp-on current probes, which safely convert AC current into a signal the logger can record. These probes — available in 10 A, 25 A, 50 A, 250 A, 500 A, and 1000 A ranges — make installation fast, safe, and completely non-intrusive. Together, they allow users to capture accurate current profiles without breaking circuits or disturbing wiring, ideal for energy audits, load studies, and HVAC diagnostics.

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.
  • 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.
  • Flexible sampling — configurable from 10 seconds to 24 hours between samples.
  • Two-stage LED alarms — visual indicators for warning and critical thresholds.
  • Long-life power — onboard lithium battery delivers up to 10 years typical operation.
  • Wide operating range — reliable from –40 °C to +85 °C for use in harsh environments.
  • 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.
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.

Unlike simple run-time counters that only track when equipment is on, the SRX3 shows how hard it’s working. Paired with ACR’s clamp-on current probes (available from 10 A to 1000 A), users can safely measure current without disconnecting wires or shutting down power. Each probe translates live AC current into precise data the logger records with 16-bit resolution, capturing subtle variations in load that reveal inefficiencies, imbalance, or cycling issues.

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.

A rugged enclosure, wide operating range (–40 °C to +85 °C), and battery life of up to ten years make the SRX3 equally at home in mechanical rooms, plant floors, and field audit kits.

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: 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.

Tip: Use the transducer’s datasheet to determine its exact volts-per-amp ratio for accurate scaling.

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.





Calibration

Data loggers are often used in highly regulated environments such as food and pharmaceutical production and storage where strict safety regulations apply. Regulatory agencies generally require proof of calibration.

ACR calibrations are performed using reference standards that have been calibrated and are traceable to the US National Institute of Standards & Technology (NIST). This ensures that all ACR data loggers meet, and perform to, their published specifications, allowing you to be confident that they will assist you in achieving your compliance requirements.

Calibration certificates are provided with every calibration we perform. ACR Systems is an ISO 9001:2015 registered company and calibration records are kept as part of our quality system and can be made available for customer audits.

Calibration Service

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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\u003eUnlike simple run-time counters that only track when equipment is on, the SRX3 shows how hard it’s working. Paired with ACR’s clamp-on current probes (available from 10 A to 1000 A), users can safely measure current without disconnecting wires or shutting down power. Each probe translates live AC current into precise data the logger records with 16-bit resolution, capturing subtle variations in load that reveal inefficiencies, imbalance, or cycling issues.\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\n\u003cp\u003eA rugged enclosure, wide operating range (–40 °C to +85 °C), and battery life of up to ten years make the SRX3 equally at home in mechanical rooms, plant floors, and field audit kits.\u003c\/p\u003e"}