Bently Nevada 3500/25-01-01-02 Keyphasor Module

3500/25-01-01-02 Bently Nevada Enhanced Keyphasor Module

Product Introduction

The 3500/25-01-01-02 from Bently Nevada provides precise speed and phase reference measurements. This Enhanced Keyphasor Module occupies a half-height front slot. It accepts up to two transducer signals from proximity probes or magnetic pickups. Furthermore, the module includes internal terminations and multi-agency approvals for hazardous locations.

Technical Specifications

The 3500/25-01-01-02 consumes only 3.2 watts typically. Each channel delivers a -24 Vdc transducer power supply with 40 mA maximum. Input impedance sits at 21.8 kΩ minimum.

Signal input range (non-isolated I/O):
+0.8 V to -21.0 V. Signals exceeding this range are internally limited.

For magnetic pickups, the shaft rotative speed must exceed 200 rpm (3.3 Hz). The input frequency range spans 1 to 1,200,000 cpm (0.017 to 20 kHz). Output range reaches 1 to 99,999 cpm (0.017 to 1667 Hz).

Speed/Frequency Accuracy

At +25°C, non-processed signals deliver:

• 0.017 to 100 Hz: ±1 cpm

• 101 to 500 Hz: ±8 cpm

• 501 to 20 kHz: ±1% of cpm

For processed signals:

• 0.017 to 60 Hz: ±1 cpm

• 61 to 150 Hz: ±8 cpm

• 151 to 20 kHz: ±1% of cpm

Threshold and Triggering Options

Auto threshold mode:
Minimum signal amplitude for triggering equals 2 volts peak to peak. Minimum frequency sits at 120 rpm (2 Hz).

Manual threshold mode:
Use for any input above 0.017 Hz (1 rpm for 1 event per revolution). You can select any value from 0 to -20 volts dc. Minimum amplitude for triggering equals 500 millivolts peak to peak. Additionally, hysteresis is user-selectable from 0.2 to 2.5 volts.

Outputs and Connectivity

Two buffered Keyphasor outputs appear at the front of the rack via coaxial connectors. Two more buffered outputs are available at the rear via Euro Style connectors. Maximum buffered output impedance equals 504 Ω.

Front panel LEDs include:

• OK LED: Indicates a fault detection in the Keyphasor Module

• TX/RX LED: Shows communication with the Rack Interface Module (RIM)

Agency Approval

The 3500/25-01-01-02 carries agency approval option 02. Therefore, it includes ATEX, IECEx, and CSA certifications for Class 1 Zone 2 hazardous areas.

Environmental Limits

Operating temperature depends on the I/O module type:

• With standard I/O (non-barrier): -30°C to +65°C

• With internal barrier I/O: 0°C to +65°C

Storage temperature spans -40°C to +85°C. Humidity tolerance reaches 95% non-condensing.

Physical Dimensions

Main module dimensions:
119.9 mm (H) x 24.4 mm (W) x 256.5 mm (D)
Note the half-height format: 119.9 mm instead of full 241 mm.

Rack space requirement:
The main module occupies one half-height front slot. The I/O module takes one full-height rear slot.

Ordering Considerations

Several important points apply to this module. External Termination (ET) blocks cannot be used with internal termination I/O modules. When ordering I/O modules with external terminations, you must order the termination blocks and cables separately.

Additionally, the 3500/25-01-01-02 includes expanded signal processing functions. Consult a qualified Bently Nevada sales representative before specifying or ordering for advanced applications.

Installation Guidelines

First, verify your rack has a Rack Interface Module (RIM) installed. Power down the rack completely. Insert the 3500/25-01-01-02 into a half-height front slot. Next, mount the I/O module in the corresponding rear slot. Connect your proximity probes or magnetic pickups to the internal termination points. Finally, restore power and check the OK LED.

Shipping & Delivery

We ship every 3500/25-01-01-02 module via FedEx, UPS, or DHL. Anti-static and mechanical protection are included in every package.

Packaging List

• 3500/25-01-01-02 Enhanced Keyphasor main module – 1 unit

• I/O module with internal terminations – 1 unit

• Installation instructions – 1 copy

Note: Certificates and warranty documents are not included in this package.

Frequently Asked Questions (FAQ)

1. How many channels does the 3500/25-01-01-02 support?
This Enhanced Keyphasor Module supports up to two transducer channels. The -01 option in the part number specifies the single half-height 2-channel card.

2. What is the minimum speed for magnetic pickup operation?
Passive magnetic pickups require a shaft rotative speed greater than 200 rpm (3.3 Hz) to generate a usable signal.

3. Can I use external termination blocks with this module?
No. The -01 I/O module type uses internal terminations. External Termination (ET) blocks are not compatible.

4. What approvals does the -02 agency option provide?
Option 02 adds ATEX, IECEx, and CSA certifications for Class 1 Zone 2 hazardous areas. This makes the module suitable for potentially explosive environments.

5. How do I set the trigger threshold manually?
Use the manual threshold mode for inputs above 0.017 Hz. Select any value from 0 to -20 volts dc. The minimum amplitude for triggering is 500 millivolts peak to peak. Hysteresis can be adjusted from 0.2 to 2.5 volts.