Introduction
Reciprocating compressors have always been the workhorses of oil, gas and process plants. As condition monitoring evolved from manual rounds to continuous online protection, engineers needed a transducer tough enough to survive the cylinder itself. The Bently Nevada 165855-15-CN answers that need. It is a Cylinder Pressure Transducer built to measure cyclic absolute pressure changes inside a reciprocating compressor cylinder, and it forms an integral part of a Reciprocating Compressor Condition Monitoring and Asset Management System when used with the 3500/77M Cylinder Pressure Monitor and System 1 software.
Why This Transducer Earns Its Place
The 165855-15-CN is a robust design for high reliability in harsh chemical environments. Its patent-pending construction keeps providing accurate pressure readings even after continual cycling over large pressure gradients for extended periods. It also withstands over-pressure situations caused by application upsets without diaphragm degradation, returning to normal operation once pressure returns to the specified operating range. The body is designed to meet IP67 conditions for moisture ingression, and the unit is made in the U.S.A.
This specific model carries the 15 pressure range option: 0 to 172 bar (0 to 2,500 psia) with armor. The wetted surface is typically installed into an isolation valve or similar pressure indicator port on the compressor, and a special adapter such as the 166393 is usually required to seal between the port and the transducer. The electronics portion sits 1 metre of cable away from the wetted surface and must be secured on or near the compressor for optimal performance.
Key Specifications
| Specification | Value |
|---|---|
| Product Type | Cylinder Pressure Transducer |
| Pressure Range Option | 0 to 172 bar (0 to 2,500 psia) w/ armor |
| Power Supply | 18 to 30 Vdc |
| Max. Current | < 15 mA |
| Frequency Response | 0 Hz to 5500 Hz ± 1 dB |
| Full Scale Output | 10 ± 0.3 Vdc |
| Zero | 0.5 ± 0.1 Vdc |
| Proof (Over) Pressure | 1.5X Full Scale |
| Burst Pressure | 3X Full Scale (2X FS on 689 bar/10,000 psia units) |
| Compensated Temperature | -40 to 85 °C (-40 to 185 °F) |
| Operating Temperature | -40 to 85 °C electronics housing; -40 to 150 °C sensor head |
| Weight | 0.4 Kg |
| Agency Approval Option | CN = Approvals country specific |
Practical Selection Advice
Before ordering, confirm the pressure range your compressor actually sees, the O-ring material that matches your process media, and the adapter needed for your indicator port. The 165855-15-CN uses a 7/8-14 UNF thread. Hifluor (black) O-rings suit hydrogen sulfide, sulfuric acid, butane, fuel oil, petroleum oil, turbine oil, propane, propylene, butylenes and natural gas. Ethylene Propylene (purple) O-rings suit ammonium hydroxide and anhydrous ammonia. Mounting torque is 68 N-m (50 lbf-ft).
For hands-on technical selection help, contact Oil AutoTech today for pricing and availability. The team supplies fast-dispatch spares for oil, gas and industrial automation applications, with quick worldwide delivery when you need them.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
