129716-XXX-127-15-CN Bently Nevada MOD 166797-0316

Bently Nevada 129716-XXX-127-15-CN MOD 166797-0316 Deep Mount Proximity Probe

• Manufacturer & Model: Bently Nevada 129716-XXX-127-15-CN MOD 166797-0316 proximity probe for 3300 XL series.
• Product Type: Eddy current probe with extended 127mm case for deep machine casing mounting.
• Key Feature: Extra-long probe case reaches through thick walls or recessed ports.
• Made in: U.S.A.
• Tip Diameter: 8 mm standard 3300 XL size.
• Linear Range: 2 mm (80 mils) from target surface.
• Sensitivity: 7.87 V/mm (200 mV/mil).

Why Choose the 127mm Extended Case

• Standard case length: Most 3300 XL probes have 45mm or 85mm cases.
• This probe offers: 127mm case for deep insertion applications.
• Common use case: Turbine casings with thick insulation layers.
• Another use case: Recessed mounting ports below machine surface.
• Benefit: No extension rod needed for most deep mounts.
• Result: Fewer connections means higher reliability.

Physical Dimensions for Deep Mounting

• Total case length: 127 mm (5.0 inches) from mounting shoulder to tip.
• Threaded section: 3/8-24 UNF, 25 mm long.
• Wrench flats: 7/8 inch (22.2 mm) for installation torque.
• Hex nut included: Lock nut secures final probe position.
• Insertion range: Adjustable 0 to 60 mm past mounting surface.
• Maximum casing thickness: Works with walls up to 100 mm thick.

Cable and Connector Details

• Cable length: 1.5 meters (4.9 feet) - shorter than standard 5m or 9m cables.
• Why short cable: Ideal when proximitor mounts near the probe.
• Connector type: CN (standard 3300 XL coaxial connector).
• No extension cable needed: Plugs directly into 330180-90-00 proximitor.
• Cable armor: Stainless steel braid resists abrasion.
• Cable jacket: FEP insulation for chemical resistance.

MOD 166797-0316 Assembly Notes

• MOD number: 166797-0316 identifies this specific long-case assembly.
• What is included: Probe, attached 1.5m cable, CN connector, lock nut.
• Calibration: Factory calibrated as a complete assembly.
• Do not disassemble: Cable length is factory set for proper tuning.
• Spare part: Order complete assembly, not individual components.

Electrical Performance Data

• Supply needed: -24 Vdc nominal, accepts -17.5 to -26 Vdc.
• Current draw: Less than 12 mA from power supply.
• Output at nominal gap (1.5mm): Approximately -10 Vdc.
• Output at minimum gap (0.5mm): Approximately -2 Vdc.
• Output at maximum gap (2.5mm): Approximately -18 Vdc.
• Output impedance: 50 ohms, drives up to 300 meters of cable.

Installation Tips for Deep Mounting

• Step 1: Thread probe into mounting hole by hand until tip touches shaft.
• Step 2: Back probe out by 1.5 full turns (approx 1.5mm gap).
• Step 3: Tighten lock nut while holding probe position.
• Step 4: Connect to proximitor and verify -10 Vdc output.
• Torque spec: 20 Nm (15 lb-ft) for lock nut maximum.
• Avoid over-tightening: Can damage threads or distort case.

Temperature Limits by Component

• Probe tip (PEEK): -35°C to 177°C (-31°F to 350°F).
• Probe case (316 SS): No limit within assembly rating.
• Cable (FEP jacket): -35°C to 105°C (-31°F to 221°F).
• Connector (CN type): -35°C to 85°C (-31°F to 185°F).
• Weakest link: Connector limits high temperature applications.
• Solution for higher temps: Use high-temp connector option (not this model).

Typical Applications for 127mm Case

• Steam turbines: Thick casing walls need longer reach.
• Gas compressors: Recessed probe ports below housing surface.
• Large pumps: Bearing housings with insulation layers.
• Paper mill rollers: Deep mounting bosses.
• Wind turbine gearboxes: Thick casting walls.

Package Contents

• Probe assembly: 129716-XXX-127-15-CN with attached cable.
• Lock nut: Matching 3/8-24 UNF hex nut.
• Documentation: Calibration certificate with sensitivity data.
• Instruction sheet: Deep mount installation guide.
• Shipping weight: 0.4 kg (0.88 lb).
• Shipping box: 35 x 15 x 5 cm protective carton.

Shipping Options

• FedEx Priority: 2-3 business days worldwide.
• UPS Express: 2-4 business days.
• DHL International: 3-5 business days.
• Rush available: Contact for same-day shipping.

Frequently Asked Questions

• Q: When do I need the 127mm extended case probe?
  A: Use this probe when your machine casing thickness exceeds 50mm. Standard 85mm probes cannot reach through thick walls. The 127mm case provides extra 42mm of reach.
• Q: Can I use an extension rod instead of this long probe?
  A: You could, but each connection adds tolerance error. A one-piece long probe is more accurate and reliable than probe-plus-extension-rod combinations.
• Q: Why is the cable only 1.5 meters on this model?
  A: The short cable suits deep mount applications where the proximitor mounts near the probe. If you need longer cable, order a different -XXX code like -050 for 5 meters.
• Q: What does XXX in the model number mean?
  A: XXX represents variable options like special coatings or non-standard thread. For standard 127mm case with 3/8-24 thread and no coating, the code is typically 000.
• Q: How do I set the correct gap with this long probe?
  A: Screw probe in until tip touches shaft. Mark position on threads. Back out 1.5 turns (approximately 1.5mm gap). Tighten lock nut. Verify with voltmeter reading -10 Vdc.