I. Basic Information

Model: 72350-05-06-02-03-01-15 (Part Number) = 3500/72 (Commercial Model)

Series: Bently Nevada 3500 Condition Monitoring System

Form: Semi-high card, occupying one semi-high slot in the 3500 frame

Function Positioning: Piston Rod Position Monitoring (RPM), Special Monitoring Card for Reciprocating Machines

Current Status: In-service mainstream, widely used in petrochemical / natural gas reciprocating compressors

II. Model Code Analysis (72350-XX-XX-XX-XX-XX-XX)

72350: Basic Component Number, fixed to represent 3500/72 Piston Rod Position Monitoring Card

-05: Hardware Version / Firmware Version

-06: Input Configuration (LVDT/4-20mA)

-02: Channel Quantity (2 Channels)

-03: Output / Communication Options (with HART)

-01: Region / Language Version (English)

-15: Special Customization / Calibration Code (Standard Customization)

III. Core Functions

Piston Rod Position / Settlement Monitoring: Receives LVDT sensor signals, real-time monitoring of reciprocating compressor piston rod position, settlement, inclination, preventing impacts and wear.

2 Channel Independent Monitoring: Can simultaneously monitor the piston rods of 2 cylinders, supporting single / double acting compressors.

High Precision Measurement: Linear range up to 3048mm (120 inches), accuracy **±0.025% FS**.

Alarm and Protection: Built-in high / low position, settlement rate, deviation alarms, can trigger shutdown protection.

Data Communication: 4-20mA + HART Output, seamless connection to DCS/PLC/System 1.

IV. Technical Parameters

Slot: Semi-high slot of 3500 frame (any semi-high slot)

Input: LVDT (Linear Variable Differential Transformer)

Channels: 2 Channels (Independent Configuration)

Measurement Range: 0–3048mm (0–120in)

Accuracy: ±0.025% Full Scale

Output: 4-20mA (HART Protocol)

Power Consumption: Typical 3.5W

Environment: Working **-40°C ~ +85°C**, Storage **-40°C ~ +85°C**

Size (H×W×D): Approximately 125 × 85 × 150 mm

Weight: Approximately 0.6 kg

V. Differences from Similar Cards Table

Project 72350-xxx (3500/72) 3500/40M (vibration) 3500/42M (displacement)

Monitoring Object Position of reciprocating machine piston rod Rotating machinery vibration Rotating machinery shaft displacement

Sensor LVDT Electrodeless Vane / Speed Electrodeless Vane

Channels 2 channels 4 channels 4 channels

Output 4-20mA + HART Relay + Serial Port Relay + Serial Port

Application Scenarios Refrigeration / Natural Gas Reciprocating Compressor Steam Turbine / Fan / Pump Compressor / Generator

VI. Typical Applications and Combinations

Application Scenario: Position of piston rod of reciprocating compressors (petrochemical, natural gas, chemical) / settlement monitoring, to prevent cylinder collision, packing case wear, and piston rod fracture.

Typical Combinations:

3500/72 + 3500/22M (Communication)

3500/72 + 3500/15 (Power Supply)

3500/72 + LVDT Sensor (such as 330850 series)

VII. Maintenance Points

Regularly calibrate the zero point and range of LVDT sensors

Check the stability of HART communication