Bently Nevada 350500-00-00-00-11-00 Dynamic Pressure Charge Amplifier

Description

The Bently Nevada 350500-00-00-00-11-00 is a Dynamic Pressure Charge Amplifier (DPCA) designed as a fundamental signal conditioning component for specialized gas turbine monitoring applications. Its primary function is to monitor high-frequency pressure pulsations that manifest due to combustion instability inside industrial gas turbine engines.

The complete sensing system encompasses a charge-coupled piezoelectric pressure sensor, a specialized low-noise interconnect cable, the 350500 charge amplifier, and an external monitoring device. The high-temperature piezoelectric sensor converts detected dynamic pressure fluctuations into a raw electrostatic charge signal scaled in pico-coulombs per unit of pressure (pC/psi or pC/bar). The 350500-00-00-00-11-00 interfaces with this sensor to convert the high-impedance charge signal into a low-impedance voltage output. This processed voltage signal is fully compatible with rack-mounted monitoring devices, such as the Bently Nevada 3500/64 Dynamic Pressure Monitor. The standard electrical interface from the monitor to the charge amplifier supplies -24 Vdc power, instrument common, and signal return paths over the exact same structural wiring layout utilized by standard Bently Nevada proximity probe systems.

Features

• High-accuracy charge-to-voltage conversion tailored for gas turbine combustion monitoring.
• Low-impedance voltage output layout compatible with standard machinery protection systems.
• Three-conductor SpringLoc terminal block design allowing secure field terminations.
• Designed for standard 35 mm DIN rail installation configurations.
• Standardized 3-pin MIL connector input interface for robust sensor tracking.
• Electrical matching to -24 Vdc instrumentation infrastructure allowing standard proximity-style loop designs.

Applications

• Gas turbine combustion instability monitoring
• Combustion chamber pressure pulsation analysis
• High-temperature piezoelectric sensor signal conditioning
• Dynamic pressure wave measurements on heavy-duty rotary assets

Ordering Information

The configuration for model 350500-00-00-00-11-00 is derived directly from the official product breakdown options:

• 350500: Dynamic Pressure Charge Amplifier Main Model Identifier.
• 00 (A - Input Sensitivity Option): 16 pC/psi (232 pC/bar) with a nominal Pole-to-Pole capacitance range of 60 to 90 picofarads.
• 00 (B - Low Pass Frequency Option): High.
• 00 (C - Output Sensitivity Option): 100 mV/psi (1.45 V/bar) ±2% @ 150 Hz.
• 11 (D - Mounting Option): DIN Mount, MIL Connector.
• 00 (E - Approvals): No Approvals.

Technical Specifications

Connections/Interfaces

Mechanical Dimensions

Installation Guidelines

• Mounting Configuration: Ensure the unit is firmly seated on a standard 35 mm DIN rail tracking layout inside an appropriate structural junction box or control cabinet.
• Sensor Cabling: Connect the high-temperature piezoelectric sensor via the specified low-noise, environmentally robust cable to prevent extraneous electrostatic charge accumulation.
• Field Wiring Requirements: Use a high-quality three-conductor shielded triad for field connections between the charge amplifier and the monitoring rack to suppress external EMI/RFI noise.
• Distance Constraints: Do not exceed the maximum allowable field cable run length of 305 meters (1000 feet) to the monitoring instrument to prevent voltage drops or loop attenuation.
• Safety Barrier Implementation: Ensure any safety barriers required by the application layout are placed along the loops connecting the charge amplifier output back to the primary rack monitoring card.

FAQ

What is the core function of the 350500 charge amplifier?

It converts high-impedance electrostatic charge signals generated by a piezoelectric pressure sensor into a stable, low-impedance voltage output.

What specific industrial problem does this module help detect?

It monitors high-frequency dynamic pressure pulsations caused by combustion instability inside gas turbine environments.

What is the factory-configured input sensitivity of this specific part number?

This specific unit (Option 00) is set for an input sensitivity of 16 pC/psi (232 pC/bar).

What output sensitivity is delivered by this charge amplifier?

It outputs a low-impedance voltage signal calibrated to 100 millivolts/psi (1.45 Volts/bar).

What type of sensor connector does this exact configuration utilize?

It is built with a standard 3-pin MIL Connector (MS31128-3P), which mates directly with an MS3116F8-3S connector or its equivalent.

How does the unit receive operating power?

It draws power over a standard 3-wire system configuration from the rack monitor, operating between -19.60 Vdc and -26 Vdc under standard non-barrier loop conditions.

What is the maximum field wiring distance permitted to the monitoring rack?

The maximum allowable run for the three-conductor shielded triad cable is 305 meters or 1000 feet.

What type of terminal blocks are used for field wiring on the unit?

The card features a three-conductor SpringLoc terminal strip that accepts wire gauges up to 16 AWG without ferrules.

Does this specific part number carry hazardous area approvals?

No, suffix option 00 dictates that this specific model variation is shipped with no hazardous area approval certifications.

What rack monitoring module interfaces with this charge amplifier?

It is fully compatible with standard machinery monitoring systems, such as the Bently Nevada 3500/64 Dynamic Pressure Monitor card.

What is the nominal pole-to-pole capacitance range for this input layout?

The nominal pole-to-pole tracking capacitance value for the 16 pC/psi input selection is 60 to 90 picofarads.