3500/72M 140734-08
Bently Nevada Recip Rod Position Monitor

4-channel proximity transducer monitor · API 618 compliant · rod drop and hyper-compressor measurement

Description

3500/72M 140734-08 accepts input from 1 to 4 proximity probes. It conditions signals for dynamic and static position measurements. The monitor compares conditioned signals with user-programmable alarms. Each channel generates measured values based on configuration. This module meets API 618 requirements for reciprocating compressors.

Key measurements: rod position, rod drop, and hyper-compressor data. It provides position magnitude, angle, crank angle, pk-pk amplitude, gap, 1X/2X/Not 1X amplitude, and average or instantaneous piston position. Designed for severe industrial environments.

Technical Specifications

Measurement Ranges and Accuracy

• Rod Position: 0.79/3.94/7.87 mV/µm · Accuracy ±0.33% FS typical, ±1% max
• Rod Drop: 3.94 or 7.87 mV/µm · Accuracy ±0.33% FS typical
• Hyper Compressor: 3.94/7.87 mV/µm · Pk-Pk, Gap, 1X/2X/Not 1X · Accuracy ±0.33% FS
• Frequency Response: Fixed 1 Hz to 600 Hz (peak-peak filter); Gap filter -3 dB at 0.09 Hz
• Notch filters: 1X and 2X vector (min rejection 57.7 dB), Not 1X (min rejection 34.9 dB) · valid 60 to 2130 cpm

Environmental and Immunity

• Operating Temp: 0 to +65 °C (32 to 149 °F)
• Storage Temp: -40 to +85 °C (-40 to 185 °F)
• Humidity: 95% non-condensing
• EMI / RFI Immunity: Meets EN 61326-1 industrial standards

Compatibility and Integration

• Fits standard 3500 rack · communicates via TX/RX with other modules
• Front buffered outputs (coaxial, one per channel) · short-circuit protected
• Compatible with Modicon Quantum systems (see link below)

Installation and Maintenance

• Dimensions: 241.3 x 24.4 x 241.8 mm (9.50 x 0.96 x 9.52 in)
• Panel LEDs: OK, TX/RX, Bypass – easy status check
• Field-replaceable main board · no special tools required

Diagnostics and Data Output

• Rod Position: magnitude, angle, crank angle, pk-pk, gap, 1X/2X/Not 1X amplitude
• Rod Drop: average piston position, average gap, instantaneous position and gap
• Hyper Channel: pk-pk displacement, gap, 1X, 2X, Not 1X amplitude

Certifications, Package and Warranty

• Certifications: API 618 compliant · CE marked · RoHS
• Package includes: 3500/72M main board, front coaxial connectors, mounting hardware, quick-start guide
• Warranty: 12 months against defects · technical verification before shipment

Typical Applications and Diagnostic Capability

• Reciprocating compressors – rod drop monitoring, piston position tracking
• Hyper-compressor – high-pressure applications, pk-pk displacement and gap
• Diagnostics: real-time vector (1X/2X) and Not 1X filtering · early wear detection
• Supports 60 to 2130 cpm machine speeds · compatible with 3500 rack systems

FAQ – Quick Answers

• Q: Does it work with existing 3500 racks? A: Yes, standard 3500 rack compatible.
• Q: What transducers are supported? A: Proximity transducers (eddy current) – 1 to 4 channels.
• Q: Can I monitor both rod drop and hyper-compressor? A: Yes, configurable per channel.
• Q: Is the unit new or refurbished? A: Tested industrial surplus or refurbished with 12-month warranty.

Shipping and Contact

Shipping carriers: FedEx, UPS, DHL – global express delivery. Tracking provided.

Inquiries:
info@oiltechcontrols.com ·
+86 158 8020 0923 (WhatsApp)

Compatibility: Integrates with
Modicon Quantum systems.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation spares – deep domain knowledge
• Global shipment support – fast delivery worldwide
• Tested industrial surplus or refurbished options – quality assured
• 12-month warranty – full coverage against defects
• Technical verification before shipment – each unit tested
• Support for obsolete control systems – keep legacy plants running