Description
Emerson PR6426/010-110
Dynamic Product Introduction
Targeted for heavy-duty turbomachinery where high thermal shifts cause standard proximity probes to crash into journals or drift off-scale, the Emerson PR6426/010-110 delivers resilient non-contact shaft measurement. When monitoring large-bore steam turbines, hydro generators, or multi-stage compressors, standard 8mm probe heads simply lack the linear range to accommodate wide mechanical runout and thermal expansion. The PR6426/010-110 solves this physical bottleneck by packing a large 32mm sensor head into a specialized 80 mm x 40 mm unthreaded mounting plate body, allowing direct bracket installation alongside massive shafts without thread deformation.
Engineers specifying the PR6426/010-110 benefit from an active 8 mm linear measurement zone and a robust 5-meter PTFE cable clad in protective flexible armor. Terminated with an authentic LEMO connector, this specific hardware configuration matches CON011, CON021, and EZ1000 signal converter requirements without risking field signal loss or impedance imbalances. Operating at target surface speeds up to 2,500 m/s, the PR6426/010-110 ensures real-time diagnostic output to keep safety instrumented systems active and false trips out of your control room.
PR6426/010-110
Key Technical Specifications
- Sensor Head Outer Diameter: 32 mm
- Mechanical Configuration: Unthreaded sleeve with 80 mm x 40 mm mounting plate
- Linear Measuring Range: 8 mm nominal span (extendable up to 24 mm with specialized signal conditioning)
- Sensitivity & Linearity: 2 V/mm (50.8 mV/mil) with linearity error ≤ ±1.5% max
- Nominal Air Gap Center: 5.5 mm (0.22 inches)
- Frequency Response: Static DC up to 20 kHz (-3dB cutoff point)
- Target Shaft Speed Limit: Up to 2,500 m/s (98,425 ips)
- Calibrated Target Material: Ferromagnetic steel (42 Cr Mo 4 standard)
- Cable Build & Length: 5 meters total length, flexible stainless armor over PTFE insulation, LEMO connector
- Temperature Rating: Operating range from -35°C to +175°C (-31°F to +347°F); short-term excursions to +200°C (<4 hours)
- Sealing & Tip Pressure: IP67 sealed tip rated to withstand 6,500 hPa (94 psi) head pressure
- Hazardous Area Approvals: ATEX / IECEx / CSA Intrinsic Safety (iA) certifications
Global Sourcing & Live-Test SOP (Transparency Core)
Navigating gray market hardware requires strict physical and electronic verification before drop-shipping units into an active power generation plant. Every PR6426/010-110 entering inventory undergoes a comprehensive bench validation SOP:
- Inbound Verification: Serial numbers on the PR6426/010-110 body plate and LEMO housing are cross-referenced against factory logs. Visual inspection confirms zero deformation on the 80x40mm mounting plate, checks the 32mm PEEK tip face for microscopic scoring, and tests the armor-to-sleeve swage fitting for mechanical strain fatigue.
- Live Simulation: The PR6426/010-110 probe is clamped into a micrometer test stand equipped with a certified 42 Cr Mo 4 steel disc. The LEMO connector plugs into a factory-calibrated CON021 signal converter powered by an isolated 24 VDC bench power supply.
- Diagnostics: The sensor tip is zeroed and advanced across the full 8 mm measuring range in precise 0.5 mm steps. Output voltage is measured via a Fluke 87V meter to confirm that sensitivity holds dead-steady at 2 V/mm within the ≤ ±1.5% margin. An oscilloscope verifies high-frequency ripple and noise immunity across the full 5-meter armored run.
- Environmental & Electrical Soak: The PR6426/010-110 undergoes insulation resistance testing between the outer armor sleeve and inner conductors at 500 VDC, maintaining a strict minimum threshold of 100 MΩ.
- Final Prep: Baseline voltage plot sheets are generated, the LEMO connector is fitted with a sealed silicone cap, and the entire PR6426/010-110 assembly is sealed inside a conductive moisture-barrier ESD pouch.
The Field Engineer’s Pitfall Guide
❗ Modifying the Integrated 5-Meter Cable Length:Never cut, alter, or splice the 5-meter armored cable of the PR6426/010-110. The probe, cable, and driver form a tuned LC resonant circuit calibrated to a specific total inductance and capacitance. Trimming even 20 cm off the armored cable shifts the carrier frequency, causing permanent calibration errors, massive zero-point drift, and invalid axial position readings.
❗ Ignoring Mounting Plate Radial Clearance Requirements:Because the PR6426/010-110 features a massive 32mm head diameter, its high-frequency electromagnetic field expands significantly beyond the sensor tip. Mounting this probe inside a tight bore or failing to clear adjacent steel casing walls by at least 80 mm causes side-wall loading—a field error that prematurely consumes your 5.5 mm nominal air gap and creates false offset voltages.
❗ Cable Armor Grounding and Ground Loops: The flexible armor shielding on the PR6426/010-110 must remain electrically isolated from intermediate structural metalwork if the cable end lands at a grounded junction box. In field deployments, letting damaged flexible armor touch grounded machine frames at mid-span creates ground loops that introduce massive 60 Hz electrical noise into your TSI monitoring rack, masking real shaft vibration signals.
Intent-Driven FAQ
Q: What do the numerical suffixes in PR6426/010-110 actually designate?The ordering code defines the exact hardware build: /010 specifies the unthreaded mounting plate body option (80 mm x 40 mm plate) without threaded sleeve bodies. The -110 suffix breaks down into: armored cable construction (1), a total length of 5 meters (1), and a LEMO connector termination (0).
Q: Can I use the PR6426/010-110 probe without a signal converter directly into a PLC DCS card? No. The PR6426/010-110 is a raw eddy current transducer requiring high-frequency excitation. It must connect via its LEMO plug into a matching converter (such as the CON011, CON021, or CON041 series) or an AMS 6500 front-end card. The converter processes the raw impedance changes into standardized -2 to -18 VDC or 4-20 mA signals acceptable for DCS hardware.
Q: Is the LEMO connector on the PR6426/010-110 waterproof for outdoor installations? The LEMO connector on the PR6426/010-110 provides basic mechanical locking, but it is not inherently IP67 rated against direct submersion or outdoor weather exposure on its own. It must be landed inside a sealed, IP65/IP66 rated cast-aluminum junction box or fitted with an approved weatherizing boot before exposing the machine housing to outdoor elements or washdown spray.
Q: What happens if my target shaft is made of 304 stainless steel instead of ferromagnetic steel?The factory calibration of the PR6426/010-110 assumes a standard 42 Cr Mo 4 ferromagnetic steel target. Installing this probe over 304 or 316 stainless steel alters the magnetic permeability significantly. While the sensor will still detect movement, its sensitivity will drop well below the 2 V/mm factory spec, requiring custom field recalibration at the converter or monitor level to avoid severely under-reporting true mechanical displacement.
Q: How do I test if a PR6426/010-110 probe has an internal coil failure? Disconnect the LEMO connector from the extension cable or converter box. Using a digital multimeter set to resistance (Ohms), measure across the center pin and the inner shield ground of the connector. A healthy PR6426/010-110 coil typically displays low DC resistance (generally under 10 ohms). An open circuit (infinite ohms) or a direct short to the outer stainless steel armor indicates internal coil damage or mechanical cable shearing.
