Product Overview

The Bently Nevada 86517-01-01-01-02 is an acceleration interface module. This module converts charge signals from piezoelectric accelerometers into proportional voltage outputs.

The device provides both acceleration and velocity outputs for machinery monitoring. Specifically, it includes selectable high-pass and low-pass filter pairs. The 86517-01-01-01-02 is made in the U.S.A. and carries CENELEC (SIRA) agency approval.

Ordering Information Breakdown

The 86517-01-01-01-02 follows a specific ordering code structure. Understanding this code helps verify correct configuration.

• 86517: Acceleration Interface Module base model.

• 01: 50 pC/g transducer charge input sensitivity.

• 01: 25 Hz high pass corner, 350 Hz low pass corner.

• 01: -10 Vdc DC signal bias voltage (no other option available).

• 02: CENELEC (SIRA) agency approval.

General Specifications

The 86517-01-01-01-02 offers robust signal conditioning for accelerometers.

• Manufacturer: Bently Nevada.

• Product Type: Acceleration Interface Module.

• Model Base: 159840-01.

• Country of Origin: Made in U.S.A.

Dimensions (LxWxH):

• 13.97 cm x 8.26 cm x 7.62 cm (5.50" x 3.25" x 3.00").

Mounting:

• Two 0.16" diameter 8-32 allen head bolts.

• Bolt pattern: 4.45" x 2.05" rectangle (113 mm x 52 mm) at opposite diagonal corners.

• Important Note: The interface module must be isolated from ground.

Power Specifications

The 86517-01-01-01-02 requires a stable DC power supply.

• Supply Voltage: -23 Vdc to -26 Vdc.

• Current Draw: 22 mA maximum.

Input Specifications

The 86517-01-01-01-02 accepts differential inputs from piezoelectric accelerometers.

• Input Type: Differential acceleration input.

• Accelerometer Sensitivity: 50 pC/g pk or 100 pC/g pk.

• Maximum Capacitance: Accelerometer pole-to-pole capacitance plus extension cable capacitance must not exceed 8,300 picofarads.

Overload Ratings:

• 50 pC/g accelerometer: 50,000 pC peak.

• 100 pC/g accelerometer: 100,000 pC peak.

Acceleration Output Specifications

The 86517-01-01-01-02 provides a balanced acceleration output.

• Sensitivity: 10 mV/g pk (1.02 mV/m/s² pk).

• Output Impedance: 50 ohms nominal, balanced output.

Dynamic Range:

• Without barriers (typical): 750 gs (7,350 m/s²).

• With barriers (typical): 500 gs (4,902 m/s²).

Frequency Response:

• Low frequency (-3 dB corner): 4.7 Hz (controlled by charge amplifier).

• High frequency (typical): Approximately 5,000 Hz (with accelerometer capacitance of 1000 pF and cable capacitance of 1000 pF).

Velocity Output Specifications

The 86517-01-01-01-02 provides a calculated velocity output.

• Accuracy: ±5.0% of calculated velocity from an ideal input in the passband of the bandpass filter at 77°F (25°C).

Filter Specifications

The 86517-01-01-01-02 includes selectable high-pass and low-pass filter pairs.

Ordered Filter Pair (this model):

• High Pass Corner: 25 Hz.

• Low Pass Corner: 350 Hz.

Other Available Filter Pairs (for reference):

• 40 Hz high pass / 300 Hz low pass.

• 100 Hz high pass / 560 Hz low pass.

Filter Characteristics:

• Type: 6th order Butterworth response.

• Rolloff: -36 dB/octave.

• Attenuation at Corner Frequency: -3 dB ±0.5 dB.

Environmental Specifications

The 86517-01-01-01-02 operates reliably in industrial conditions.

• Operating Temperature: 0°C to 70°C (+32°F to +158°F).

• Storage Temperature: -40°C to +85°C (-40°F to +185°F).

• Humidity: 0 to 95%, non-condensing.

Connector Specifications

The 86517-01-01-01-02 uses specific connectors for inputs and outputs.

• Accelerometer Input Connector: MS-3112-8-3P.

• Power/Output Connector: 8-lug terminal block.

Agency Approval

The -02 suffix indicates CENELEC (SIRA) agency approval. Therefore, this module is certified for use in European hazardous area installations.

Key Features

The 86517-01-01-01-02 offers several advantages for accelerometer signal conditioning.

Piezoelectric Accelerometer Interface:
Accepts differential inputs from charge-type accelerometers. Sensitivity options are 50 pC/g or 100 pC/g.

Dual Outputs (Acceleration and Velocity):
Provides both raw acceleration (10 mV/g) and filtered velocity outputs. Consequently, it suits comprehensive machinery monitoring.

Selectable Filter Pairs:
Includes 25 Hz/350 Hz, 40 Hz/300 Hz, or 100 Hz/560 Hz options. Thus, it matches application-specific frequency requirements.

Butterworth Filter Response:
6th order filters provide -36 dB/octave rolloff. Therefore, sharp cutoff characteristics are achieved.

Wide Dynamic Range:
Handles up to 750 g without barriers and 500 g with barriers. Hence, it captures high-amplitude shock events.

CENELEC Approval:
Certified for hazardous area use. For this reason, it suits European industrial installations.

Ground Isolation Required:
The module must be isolated from ground. This prevents ground loops and ensures signal integrity.

Typical Applications

The 86517-01-01-01-02 suits various accelerometer monitoring applications.

• Bearing housing acceleration monitoring on turbines.

• Gearbox vibration measurement on compressors.

• Case acceleration monitoring on pumps and fans.

• Shock pulse measurement on rotating machinery.

• Velocity monitoring via integrated filtering.

Installation Guidelines

Install the 86517-01-01-01-02 according to standard Bently Nevada practices. First, mount the module using two 8-32 allen head bolts on the specified 4.45" x 2.05" rectangle. Critical: The module must be isolated from ground.

Connect the piezoelectric accelerometer to the MS-3112-8-3P input connector. Ensure total capacitance (accelerometer + cable) does not exceed 8,300 pF. Then, connect the power supply at -23 Vdc to -26 Vdc. Current draw is 22 mA maximum.

Connect the acceleration output (10 mV/g) and velocity output to the 8-lug terminal block. The velocity output accuracy is ±5.0% at 25°C within the filter passband. For high-frequency response, keep accelerometer and cable capacitance below 2,000 pF total.

What is in the Box

Please inspect all items upon delivery.

• Bently Nevada 86517-01-01-01-02 acceleration interface module.

• MS-3112-8-3P accelerometer input connector (on module).

• 8-lug terminal block for power/output connections.

• Mounting bolts (2 x 8-32 allen head).

• Installation instruction manual.

Frequently Asked Questions (FAQ)

1. What is the input sensitivity of the 86517-01-01-01-02?

The 86517-01-01-01-02 has a transducer charge input sensitivity of 50 pC/g. The -01 option specifies this value.

2. What filter frequencies does this module provide?

The 86517-01-01-01-02 includes a 25 Hz high-pass corner and a 350 Hz low-pass corner. The -01 filter option specifies this pair.

3. What is the acceleration output sensitivity?

The acceleration output sensitivity is 10 mV/g pk (1.02 mV/m/s² pk). The output is balanced with 50 ohm nominal impedance.

4. What power supply does this module require?

The 86517-01-01-01-02 requires a supply voltage between -23 Vdc and -26 Vdc. Current draw is 22 mA maximum.

5. Does the module need to be grounded?

No. The 86517-01-01-01-02 must be isolated from ground. Therefore, use insulated mounting hardware and avoid grounding the module chassis.