Bently Nevada 3500/70M 140734-09 (Shock/Speed Monitoring Card for Reciprocating Compressors)

Front of 3500/70M module

Side of module
1、 Basic Model Description
Model: 3500/70M | Part Number: 140734-09, 4-channel reciprocating compressor dedicated seismic signal monitoring module (Recip impact/velocity card), belonging to the 3500 TSI unit protection system, SIL2 safety certification
Positioning: Designed specifically for API618 reciprocating compressors, it collects casing impact, crosshead, and crankcase vibration, distinguishing it from 3500/42M rotating mechanical vibration cards
Discontinued status: The original factory has ceased production and there are no new hardware models available for direct replacement; Market source: brand new original inventory, dismantled good products

2、 Hardware channels and input specifications
Project parameters
Channel configuration includes 4 independent inputs, with 1&2 in groups and 3&4 in pairs. Each group can have its own measurement type
Only seismic (piezoelectric/velocity) sensors are compatible with the 330500 series Velomitor velocity sensor and piezoelectric acceleration sensor (your previous 330500-01-04 was paired with this card)
Sensor power supply channel output -22VDC, maximum 40mA to power the sensor
Input impedance 15k Ω
Four measurement modes (single channel optional) 1. Pulse impact acceleration (Impulse Acc, cylinder valve plate impact fault)
2. Second order acceleration (Acceleration2, connecting rod loosening impact)
3. Recip Vel (vibration during crosshead operation)
4. Low frequency reciprocating speed (LF Recip Vel, low-frequency vibration of crankcase)
Frequency response range impact/acceleration: 3Hz~3000Hz; Reciprocal speed: 1Hz-400Hz

3、 Electrical and physical parameters
Rack: Standard 3500 rack slot, front and rear card separation, rear daughter board matching 176449-09 (paired one by one)
Power consumption: Single card ≤ 6W, unified power supply for rack backplane
Panel indicator lights: OK operation, communication TX/RX, bypass three status LED
Size: 242 × 24 × 242mm, net weight ≈ 0.9kg
Working environment: -40 ℃~+70 ℃, 5%~95% RH, no condensation, petrochemical explosion-proof cabinet available
Signal output: 4-20mA analog input to DCS, rack bus communication to 3500 framework, System1 fault diagnosis software
Alarm: Each channel can be programmed with a warning/danger two-stage alarm, and the danger point can be interlocked with a hard contact for shutdown
3、 Classification of matching reciprocating unit cards of the same series
3500/70M (this model): Chassis impact, crosshead velocity vibration (seismic sensor)
3500/72M: Piston rod sinking/piston rod position (eddy current probe)
3500/77M: Cylinder pressure monitoring (dedicated pressure sensor)
Petrochemical reciprocating machine set standard: 70M+72M+77M combination for use

4、 Usage scenarios
Petroleum Refining/Coal Chemical Industry: Large reciprocating process compressors, hydrogenation compressors, and boosters (mainstream TSI protection for API618 units)
Natural gas station: reciprocating gas compressor, wellhead booster unit
Monitoring faults: broken air valve, loose connecting rod, worn crosshead pin, cylinder block impact, deterioration of crankcase, over limit interlock shutdown protection unit

5、 Spare parts and replacement instructions
No original factory upgrade direct card, priority purchase of original 140734-09 for faults; The renovation plan replaces the entire 3500 framework with the AMS6500 system
Complete set required: front card 140734-09+rear bottom plate 176449-09, missing one piece cannot be used on the machine