EMERSON PR6426/010-030 CON021/916-160 Replacement Solution

Product Overview

EMERSON PR6426/010-030 CON021/916-160 Replacement Solution: Smooth Migration from Legacy Proximity Systems

The EMERSON PR6426/010-030 paired with the CON021/916-160 signal conditioner forms a complete eddy current proximity measurement system widely deployed in rotating machinery protection, turbine shaft monitoring, and compressor vibration analysis across oil & gas, power generation, and heavy industrial facilities. As legacy Bently Nevada 3300 Series and 7200 Series installations reach end-of-service life, plant engineers and reliability teams are actively seeking verified replacement and upgrade paths that preserve existing wiring infrastructure, maintain compatibility with installed monitoring racks, and eliminate costly re-engineering of control cabinet layouts.

TOPNLMS stocks the PR6426/010-030 + CON021/916-160 combination as a matched, tested assembly. Each unit undergoes pre-shipment functional verification to confirm output sensitivity (8 mV/µm standard), gap voltage linearity, and signal conditioner channel calibration before dispatch. This ensures that your replacement arrives ready for direct installation without additional bench calibration.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from an aging proximity measurement system to the PR6426/010-030 + CON021/916-160 rarely involves only the probe and conditioner. In practice, field engineers encounter a cascade of interdependent components that must be evaluated and, in many cases, replaced or upgraded simultaneously to ensure system integrity.

The CON021/916-160 signal conditioner is designed for DIN rail installation and integrates cleanly into existing control cabinet layouts. However, if your cabinet currently houses a Bently Nevada 3500/42M or 3500/45 position monitor card, you will need to verify that the analog output from the CON021 is correctly terminated into the monitor’s input impedance. In most cases, a simple re-termination at the terminal block is sufficient, and no rewiring of the field cable from the probe installation point is required.

For plants running Emerson Ovation DCS or DeltaV distributed control systems, the analog output of the CON021 feeds directly into standard AI (Analog Input) modules such as the KJ3221X1-BA1 or equivalent 4–20 mA input cards. No protocol conversion is needed, as the PR6426 system outputs a standard voltage or current signal fully compatible with conventional DCS analog input channels.

Where the existing installation uses a Bently Nevada 3300 XL proximitor mounted in a junction box near the machine, the PR6426/010-030 probe can be installed in the same threaded boss (verify thread specification: M10×1 or 3/8–24 UNF) and the extension cable routed through the same conduit. The CON021/916-160 conditioner then replaces the proximitor electronics, typically mounted on a 35 mm DIN rail inside the local junction box or the main MCC panel.

During commissioning, engineers should use a PR9376 calibration tool or equivalent gap simulator to verify the static gap voltage at the CON021 output before connecting to the monitoring system. This step is critical when replacing probes on high-speed turbines or compressors where a miscalibrated gap can trigger spurious vibration alarms on the Bently Nevada 3500 Series rack or the plant’s safety instrumented system.

If your upgrade scope extends to the power supply infrastructure, the CON021 operates from a standard –24 VDC rail. Existing Emerson PR9268/200 or equivalent DIN rail power supply modules are fully compatible and do not require replacement unless the PSU is also at end-of-life. For new cabinet builds, a redundant –24 VDC supply arrangement is recommended to meet SIL 2 availability requirements common in turbomachinery protection applications.

Plants migrating from older 7200 Series installations may also need to address the interconnecting cable assembly. The PR6426/010-030 includes a 3.0 m extension cable, but longer runs to the control room require a field-extension cable such as the PR6422/005 or equivalent low-capacitance coaxial assembly. Maintaining cable capacitance within the specified range (typically <100 pF/m) is essential to preserve measurement linearity at the CON021 input.

For facilities that have standardized on Emerson AMS Machinery Manager for predictive maintenance, the analog outputs from the CON021 can be connected to a CSI 2140 machinery health analyzer or routed through a Rosemount 3051S series transmitter for integration into the plant asset management network. This allows the PR6426 system to contribute vibration trend data to the broader condition monitoring program without requiring a dedicated online monitoring rack.

Finally, if the control cabinet also houses relay output modules for high-vibration trip functions, verify that the CON021’s relay or analog output is correctly mapped to the existing Pilz PNOZ or equivalent safety relay. The CON021/916-160 supports configurable alarm and danger setpoints, which should be documented and re-entered during commissioning to match the original system’s trip philosophy.

Retrofit Guidance FAQ

Q: Can I reuse the existing field wiring from my 3300 XL proximitor installation?
A: In most cases, yes. The PR6426/010-030 uses a standard coaxial cable interface. If the existing cable is low-capacitance coaxial in good condition, it can typically be reused. Verify total cable capacitance does not exceed the CON021 input specification before finalizing the installation.

Q: Do I need to modify my PLC or DCS program after replacing the proximity system?
A: No program changes are required if the CON021 output signal range (voltage or 4–20 mA) matches the existing AI channel configuration. Confirm the engineering unit scaling in your DCS or PLC (e.g., Emerson DeltaV or Ovation) matches the new system’s sensitivity of 8 mV/µm before going live.

Q: Is the PR6426/010-030 compatible with Bently Nevada 3500 Series monitoring racks?
A: The PR6426 probe and CON021 conditioner output a standard –24 VDC proximitor-compatible signal. Compatibility with 3500 Series input cards depends on the specific card type. Consult the 3500/42M or 3500/45 manual for input signal specifications and confirm with your system integrator before installation.

Q: What is the physical installation space requirement for the CON021/916-160?
A: The CON021 mounts on a standard 35 mm DIN rail. Its compact footprint makes it suitable for installation in existing junction boxes or control cabinets without requiring additional panel space in most retrofit scenarios.

Q: How do I handle the gap setting during replacement?
A: Set the probe gap to the nominal value specified for your machine (typically 1.0–1.5 mm for most turbomachinery applications). Use a gap simulator or feeler gauge to verify the static gap voltage at the CON021 output matches the expected value before connecting to the monitoring system.

Q: What communication protocols does the CON021/916-160 support?
A: The CON021 provides analog voltage and optional 4–20 mA outputs. It does not natively support digital fieldbus protocols such as PROFIBUS or HART. For digital integration, use an appropriate signal converter or connect the analog output to a compatible AI module in your DCS or PLC rack.

Warranty Assurance

Every PR6426/010-030 + CON021/916-160 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of shipment. Our pre-shipment inspection protocol includes functional testing of probe sensitivity, extension cable continuity, and CON021 channel output verification. Units that do not meet factory specifications are quarantined and not dispatched.

In the event of a warranty claim, TOPNLMS provides a replacement unit dispatch within 3 business days of claim confirmation, minimizing plant downtime. Our after-sales team is reachable via email at [email protected] or by phone at +86 18359293191 for technical support, commissioning guidance, and RMA processing.

Stock is maintained in Xiamen, China, with express international shipping available to most destinations. Lead time for in-stock units is typically 3–7 business days door-to-door for standard international express services. Customs documentation, including commercial invoice, packing list, and certificate of origin, is provided with every shipment to facilitate smooth customs clearance.

For procurement teams requiring formal quotations, approved vendor documentation, or batch orders for planned maintenance shutdowns, please contact us directly. Volume pricing and consignment stock arrangements are available for qualified industrial customers.