3500/70M (176449-09+135489-01) Recip Impulse Velocity Monitor / Bently Nevada

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3500/70M Recip Impulse Velocity Monitor

The Bently Nevada 3500/70M Recip Impulse Velocity Monitor is a 4-channel device used as part of the reciprocating compressor solutions package to monitor compressor crankcase and crosshead vibration. The monitor accepts input from seismic transducers, conditions the signal to derive vibration measurements, and compares the conditioned signals with user-programmable alarms.

Specifications of 3500/70M

Signal:Accepts from 1 to 4 proximity probe signals.
Input impedance:
10 kΩ acceleration input
>1 MΩ velocity input
Special inhibit:Contact closure 5 Vdc @ 390μA typical
Power consumption: 7.7 watts, nominal
Voltage compliance:+12 Vdc maximum
Load resistance:600 Ω maximum
Resolution:0.3662 µA maximum

+Monitor Module (Main Board):

Dimensions(Height x Width x Depth):

241.3 mm x 24.4 mm x241.8 mm(9.50 in x 0.96 in x 9.52 in)
Weight:0.91 kg (2.0 lb)

Dimensions(Height x Width xDepth):
241.3 mm x 24.4 mm x 99.1mm(9.50 in x 0.96 in x 3.90 in)
Weight 0.20 kg (0.44 lb)

+I/O Modules (barrier):

Dimensions(Height x Width xDepth):
241.3 mm x 24.4 mm x163.1 mm
(9.50 in x 0.96 in x 6.42 in)
Weight:0.46 kg (1.01 lb)

3500/70M Spares

176449-09 - 3500/70M Recip Impulse Velocity Monitor

135489-01 - I/O Module with Internal Barriers, Internal Terminations 4 x Prox/Accel

FAQ of 3500/70M

What is the 3500/70M Reciprocating Impulse Velocity Monitor (176449-09 + 135489-01)?
A: It is a 4‑channel monitor for reciprocating compressors. It measures crankcase and crosshead vibration using seismic transducers. The 135489-01 I/O module provides internal intrinsic safety barriers and internal terminations for up to four Proximitor or accelerometer sensors.

What is special about the 135489-01 I/O module?
A: It includes internal barriers (entity parameters) and internal terminations, allowing direct connection of Proximitor or accelerometer sensors in hazardous areas without external barriers. It supports 4 x Proximitor/Accelerometer inputs.

What rack space is required?
A:
Main monitor (176449-09): 1 full‑height front slot
I/O module (135489-01): 1 full‑height rear slot