Product Overview
The Bently Nevada 3500/77M 176449-07 is a dedicated pressure monitor designed for continuous monitoring of cylinder pressure in reciprocating compressors. This Industrial Automation Module accepts up to four channels of Bently Nevada approved positive voltage pressure transducers (psia) and provides real-time measurement of critical parameters. With its robust construction and precise signal conditioning, the 3500/77M 176449-07 ensures reliable operation in demanding environments.
Technical Specifications
The 3500/77M 176449-07 offers a comprehensive set of specifications that make it suitable for a wide range of industrial applications. Below are the key parameters:
| Parameter |
Value |
| Input Channels |
1 to 4 channels of Bently Nevada approved positive voltage pressure transducers (psia) |
| Frequency Response |
0 to 5.5 kHz on all configured pressure channels |
| Pressure Accuracy |
±0.5% of full-range at +25°C; ±1.0% over –30°C to +65°C |
| Input Impedance |
50 kΩ (Internal/External Termination Cylinder Pressure I/O) |
| Power Consumption |
7.8 Watts with transducer supplies at full load |
| Transducer Power Supply |
+23.0 ± 0.8 Vdc with 24.5 mA current limiting per channel |
| Operating Temperature |
-30°C to +65°C (with I/O module) |
| Storage Temperature |
-40°C to +85°C |
| Humidity |
95% non-condensing |
| Monitor Module Dimensions |
241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in) |
| Monitor Module Weight |
0.91 kg (2.0 lb) |
| I/O Module Dimensions |
241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in) |
| I/O Module Weight |
0.20 kg (0.44 lb) |
| Rack Space |
1 full-height front slot (monitor), 1 full-height rear slot (I/O) |
Key Features
- Accepts 1 to 4 channels of Bently Nevada approved positive voltage pressure transducers.
- Scale factors available for ranges from 100 psia to 10,000 psia.
- Measures discharge pressure, suction pressure, maximum/minimum pressure, compression ratio, peak rod compression, peak rod tension, and degree of rod reversal.
- Front panel LEDs for OK, TX/RX, and Bypass status.
- Buffered transducer outputs with short-circuit protection.
- Inverted and offset buffered outputs (-2.265 Vdc) when using Cylinder Pressure I/O module.
Industry Applications
The Bently Nevada 3500/77M 176449-07 is ideally suited for reciprocating compressor monitoring in industries such as oil and gas, petrochemical, and power generation. Its ability to monitor multiple pressure parameters simultaneously makes it invaluable for predictive maintenance and performance optimization. For example, tracking peak rod compression and tension helps detect abnormal loads, preventing costly downtime.
Installation & Setup Guidance
When installing the 3500/77M 176449-07, ensure proper rack slot allocation: one full-height front slot for the monitor module and one full-height rear slot for the I/O module. Connect each pressure transducer to the corresponding channel input, observing correct polarity. The buffered transducer outputs are available via coaxial connectors on the front panel; these are short-circuit protected. Verify that the transducer power supply (+23.0 Vdc) is correctly set and current limiting is active. For accurate readings, calibrate the scale factor according to your transducer's pressure range.
Maintenance & Reliability
Regular maintenance of the 3500/77M 176449-07 ensures long-term reliability. Check the front panel LEDs periodically to confirm normal operation. Ensure the operating environment stays within –30°C to +65°C and humidity below 95% non-condensing. Inspect transducer connections and cabling for wear or damage. The monitor's low power consumption (7.8 W) reduces heat buildup, contributing to extended service life.
Selection Guide & Purchasing Advice
Before purchasing the Bently Nevada 3500/77M 176449-07, verify your rack compatibility and required I/O configuration. Confirm the pressure range and scale factor needed for your application. As a trusted supplier, PLC Source PRO offers genuine Bently Nevada modules with fast shipping and competitive pricing. Ensure you order the correct model number 3500/77M 176449-07 to meet your exact requirements.