Technical Specifications of Bently Nevada 176449-07
The Bently Nevada 3500/77M (Model 176449-07) provides precise pressure monitoring. It uses Bently Nevada approved positive voltage 3rd-party pressure transducers.
Inputs and Signal Conditioning
Input Channels: Accepts 1 to 4 channels of pressure transducers.
Frequency Response: Ranges from 0 to 5.5 kHz on all configured channels.
Pressure Accuracy: Within ± 0.5% at +25°C (77°F). Within ± 1.0% from -30°C to +65°C.
Input Impedance: Rated at 50 kΩ for Cylinder Pressure I/O.
Scale Factor Ranges
The 176449-07 supports multiple pressure ranges. Each range has a specific scale factor.
100 psia: Scale factor = 95,000 mV/psi
250 psia: Scale factor = 38,000 mV/psi
500 psia: Scale factor = 19,000 mV/psi
1000 psia: Scale factor = 9,500 mV/psi
2500 psia: Scale factor = 3,800 mV/psi
5000 psia: Scale factor = 1,900 mV/psi
10,000 psia: Scale factor = 950 mV/psi
Measured Variables
The 3500/77M monitors key compressor parameters. These include Cylinder Pressure, Discharge Pressure, and Suction Pressure. It also tracks Maximum Pressure and Minimum Pressure. Other variables are Compression Ratio, Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal.
Outputs and LED Indicators
Front Panel LEDs: Includes OK LED, TX/RX LED, and Bypass LED.
Buffered Transducer Outputs: One coaxial connector per channel. Each connector has short-circuit protection.
Output Impedance: Rated at 550 Ω.
Transducer Power Supply: Provides +23.0 ± 0.8 Vdc. Includes 24.5 mA current limiting per channel.
Environmental Limits
Operating Temperature: -30°C to +65°C (-22°F to +150°F)
Storage Temperature: -40°C to +85°C (-40°F to +185°F)
Humidity: 95%, non-condensing
Power Consumption
The 176449-07 consumes 7.8 Watts with transducer supplies at full load.
Installation Guide for 3500/77M Monitor
Follow these steps to install the Bently Nevada 3500/77M. Always power off the 3500 rack before installation.
Insert the monitor module into 1 full-height front slot of the 3500 rack.
Insert the I/O module into 1 full-height rear slot.
Connect pressure transducers to the I/O module terminals.
Use the coaxial connectors on the front for buffered outputs.
Verify the OK LED turns green after power-up.
Note: The buffered outputs are inverted and offset by -2.265 Vdc when using the Cylinder Pressure I/O module.
Package Contents (176449-07)
1 x Bently Nevada 3500/77M Pressure Monitor Module (176449-07)
1 x Cylinder Pressure I/O Module
1 x Front panel coaxial connector (per channel)
Frequently Asked Questions (FAQ)
1. What is the accuracy of the 176449-07 pressure monitor?
The 176449-07 offers ± 0.5% accuracy at +25°C. It provides ± 1.0% accuracy from -30°C to +65°C.
2. How many channels does the Bently Nevada 3500/77M support?
The 3500/77M supports 1 to 4 channels of Bently Nevada approved pressure transducers.
3. What is the frequency response of this pressure monitor?
The frequency response is 0 to 5.5 kHz on all configured pressure channels.
4. Can this module measure compression ratio?
Yes, the 176449-07 measures Compression Ratio along with discharge pressure and suction pressure.
5. What is the power consumption of the 3500/77M?
The Bently Nevada 3500/77M consumes 7.8 Watts at full load with transducer supplies active.
Why Choose This Bently Nevada 176449-07?
The 176449-07 delivers reliable pressure monitoring for reciprocating compressors. Its wide temperature range ensures stable operation in harsh environments. The module’s high accuracy protects your critical machinery. Choose this Bently Nevada 3500/77M for your next maintenance cycle.
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