Product Introduction
When reciprocating compressor performance degrades due to undetected pressure anomalies, the Bently Nevada 165855-15-CN Cylinder Pressure Transducer provides precise cyclic absolute pressure measurements. This transducer is an integral part of a Reciprocating Compressor Condition Monitoring and Asset Management System when utilized with the 3500/77M Cylinder Pressure Monitor and System 1 Plant Asset Management Software. Designed for high reliability in harsh chemical environments, the 165855-15-CN features a patent-pending design that maintains accurate readings even after continuous cycling over large pressure gradients.
Technical Specifications Breakdown
The 165855-15-CN offers a measurement range from 0 to 100/250/500/1000/2500/5000/10,000 psia (0 to 6.8/17/34.5/69/172/345/689 bar). Its full-scale output is 10 ± 0.3 Vdc with a zero offset of 0.5 ± 0.1 Vdc. The transducer requires an 18 to 30 Vdc power supply and draws less than 15 mA maximum current. Frequency response spans from 0 Hz to 5500 Hz ± 1 dB, ensuring accurate dynamic pressure capture. The compensated temperature range is -40 to 85°C (-40 to 185°F), with thermal zero shift specified as -1.0 to +2.0 %FS for lower pressure ranges and -0.5 to +1.5 %FS for others. Linearity, hysteresis, and repeatability are within ±0.3 %FS. The sensor head operates from -40 to 150°C (-40 to 302°F), while the electronics housing operates from -40 to 85°C (-40 to 185°F). Weight is 250 g (0.55 lbm) for the transducer and 150 g (0.33 lbm) for the sensor head.
Industry Applications
In petrochemical plants, the 165855-15-CN monitors cylinder pressure in reciprocating compressors handling hydrogen sulfide, butane, fuel oil, or natural gas. Its wetted surface, made of C-276 welded to 316L stainless steel with gold plating per MIL-G-45204 Type III Grade A, resists corrosive media. The transducer withstands over-pressure situations up to 1.5X full scale (proof pressure) and burst pressure up to 3X full scale (2X for 689 bar/10,000 psia units), ensuring reliable operation during process upsets. For ammonia applications, the optional ethylene propylene O-ring material provides compatibility with anhydrous ammonia.
Installation & Setup Guidance
Install the 165855-15-CN into an isolation valve or pressure indicator port on the compressor. A special adapter, such as the 166393 adapter, typically provides a seal between the port and the transducer. The electronics portion is separated from the wetted surface by 1 metre of cable and must be secured on or near the compressor for optimal performance. Apply a mounting torque of 68 N-m (50 lbf-ft). The transducer body is designed to meet IP67 and NEMA 4X conditions for moisture ingression. Note that operating temperature depends on O-ring material: Hifluor supports -26°C to 150°C (-15°F to 302°F), while Ethylene Propylene supports -40°C to 150°C (-40°F to 302°F).
Maintenance & Reliability
Regular inspection of the transducer and interconnect cable (146824) is recommended to ensure reliable operation. The robust design minimizes diaphragm degradation from continuous pressure cycling, reducing maintenance frequency. The transducer's ability to return to normal operation after over-pressure events extends service life. Verify that the O-ring material matches the process media to prevent chemical attack. For safety-rated systems, follow the manufacturer's guidelines for periodic testing.
Compatibility & Integration
The 165855-15-CN integrates seamlessly with the Bently Nevada 3500/77M Cylinder Pressure Monitor and System 1 Plant Asset Management Software. This combination provides comprehensive condition monitoring and asset management for reciprocating compressors. The transducer's 10 Vdc full-scale output simplifies interface with monitoring systems. The 146824 interconnect cable is required for connection.
Selection Guide & Purchasing Advice
Before ordering, verify the required pressure range and agency approval. The 165855-15-CN with the "15" pressure range option covers 0 to 172 bar (0 to 2,500 psia) with armor. The "CN" agency approval is country-specific. Confirm O-ring material compatibility with your process media (Hifluor for hydrocarbons, Ethylene Propylene for ammonia). SpareTechPLC offers this transducer along with compatible accessories like the 166393 adapter and 146824 cable. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
