Emerson EZ1000 Replacement/Upgrade Solution for EZ Series

Product Overview

Emerson EZ1000 Replacement/Upgrade Solution for EZ Series: Smooth Migration from Legacy Current Measurement Systems

Upgrading or replacing an Emerson EZ1000 Non-Invasive AC/DC Current Transducer in an active industrial control system demands more than a simple part swap. Whether your existing installation relies on a legacy DCS loop, a standalone PLC analog input card, or a panel-mounted energy monitoring rack, the EZ1000 is engineered to deliver a seamless, drop-in migration path that minimizes engineering rework, reduces commissioning time, and eliminates unplanned downtime.

The EZ1000 is a clamp-on, non-invasive current transducer covering a measurement range of 0–1000 A AC/DC. Its split-core design allows field installation without breaking the primary conductor — a critical advantage when replacing a discontinued or aging transducer in a live panel or motor control center (MCC). The 4–20 mA analog output is universally compatible with virtually every PLC analog input module, DCS field I/O card, and standalone data acquisition unit currently in service across industrial facilities.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful EZ1000 migration rarely involves a single component. In practice, field engineers replacing a legacy current transducer in a motor control center or distribution panel will often need to verify or simultaneously upgrade several adjacent components to ensure system integrity.

On the signal conditioning side, if the existing installation uses an older signal isolator or loop-powered transmitter — such as a Phoenix Contact MINI MCR or a Weidmüller ACT20P signal conditioner — the EZ1000’s 4–20 mA output integrates directly without requiring a new isolator, though upgrading to a modern galvanic isolation barrier is recommended when replacing aging DCS field I/O wiring harnesses.

For PLC-based systems, the EZ1000 connects directly to any standard analog input module. Common migration scenarios involve Siemens S7-300 or S7-400 series SM 331 analog input modules, where the 4–20 mA channel configuration requires no software re-scaling when the legacy transducer shared the same output range. In Rockwell Automation ControlLogix or CompactLogix environments, the 1756-IF16 or 1769-IF4 analog input modules accept the EZ1000 signal natively, and the existing ladder logic or function block program typically requires only a tag rename rather than a full re-engineering effort.

In DCS environments — particularly those running Emerson DeltaV or Honeywell Experion PKS — the EZ1000 connects to standard 4–20 mA field termination assemblies (FTAs) or marshalling cabinets without modification. Engineers migrating from a discontinued Emerson Rosemount 648 temperature transmitter or a legacy Foxboro 843DP pressure transmitter in the same I/O loop will find that the EZ1000 shares the same wiring topology, simplifying multi-point loop replacements during a planned shutdown window.

When the upgrade scope extends to the power supply rail, a 24 VDC DIN rail power supply — such as a Phoenix Contact QUINT or a Siemens SITOP PSU100S — provides stable loop power for multiple EZ1000 units on the same bus without derating concerns. For installations where the control cabinet houses both the EZ1000 and a variable frequency drive (VFD) such as an ABB ACS880 or a Danfoss FC302, proper shielding of the 4–20 mA signal cable is essential to suppress EMI from the drive’s switching frequency; standard shielded twisted-pair (STP) cable with single-point grounding at the control panel end is the recommended practice.

In energy metering and power quality monitoring applications, the EZ1000 is frequently paired with a multifunction power meter — such as a Schneider Electric PM5000 series or an ABB M2M — where the transducer’s analog output feeds the meter’s current input channel, replacing a legacy wound-core CT that required primary conductor interruption during installation. This non-invasive retrofit approach is particularly valued in 24/7 continuous process environments such as water treatment, chemical processing, and food and beverage manufacturing, where planned outages are tightly constrained.

Retrofit Guidance FAQ

Q: Can I replace my existing current transducer with the EZ1000 without modifying the wiring?
A: In most cases, yes. The EZ1000 uses a standard 2-wire 4–20 mA loop-powered output. If your existing transducer uses the same output type and the same conductor size passes through the clamp aperture, the replacement is direct. Verify the loop supply voltage (24 VDC nominal) and the input impedance of your PLC or DCS analog input module before installation.

Q: Does the EZ1000 require changes to my PLC program or DCS configuration?
A: Not if the legacy transducer used the same 4–20 mA output range and the same engineering unit scaling (0–1000 A). If the old transducer had a different full-scale range (e.g., 0–600 A), you will need to update the scaling block or analog input channel configuration in your PLC or DCS to reflect the new 0–1000 A span.

Q: Is the EZ1000 compatible with HART or Profibus PA communication?
A: The EZ1000 is an analog 4–20 mA device and does not support HART, Profibus PA, or Foundation Fieldbus. If your system requires digital field communication, consult our team for alternative transducer models with HART overlay capability.

Q: How much panel space does the EZ1000 require?
A: The EZ1000 is a clamp-on device that mounts directly on the primary conductor. It does not require DIN rail space or panel cutout. The only panel space consideration is the routing of the 4–20 mA signal cable to the nearest terminal block or analog input module.

Q: Can the EZ1000 measure DC current as well as AC?
A: Yes. The EZ1000 is rated for both AC and DC current measurement, making it suitable for battery systems, DC bus monitoring in VFD applications, and renewable energy installations where DC current measurement is required alongside AC grid monitoring.

Q: What is the recommended commissioning procedure after installation?
A: After clamping the EZ1000 onto the primary conductor and connecting the 4–20 mA loop, verify the zero-current output (should read 4 mA with no load on the conductor), then apply a known load and confirm the output scales linearly to the expected mA value. Log the as-found and as-left readings in your maintenance management system (CMMS) for traceability.

Warranty Assurance

Every EZ1000 unit shipped by TOPNLMS is covered by a 12-Month Warranty from the date of delivery. Prior to shipment, each unit undergoes functional output verification, insulation resistance testing, and dimensional inspection to confirm compliance with the published specification sheet. Units that fail any pre-shipment test are quarantined and not dispatched.

In the event of a warranty claim, TOPNLMS will assess the reported fault within 3 business days of receiving the returned unit. If the defect is confirmed as a manufacturing or quality issue, a replacement unit will be dispatched at no additional cost. If the unit has been damaged due to installation error, overvoltage, or mechanical impact, a detailed failure analysis report will be provided to support your internal maintenance records.

TOPNLMS maintains buffer stock of the EZ1000 to support urgent replacement orders. Standard lead time for in-stock units is 3–7 business days for international air freight. Express shipment options (DHL, FedEx, UPS) are available for critical plant shutdowns or emergency maintenance windows. All units are shipped with a certificate of conformance and packing list for customs clearance.

For procurement inquiries, bulk pricing, or technical pre-sales support, contact our industrial automation team directly.