{"product_id":"bently-nevada-3500-77m-140734-07-recip-cylinder-pressure-monitor","title":"Bently Nevada 3500\/77M 140734-07 Recip Cylinder Pressure Monitor","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 3500\/77M 140734-07\u003c\/strong\u003e is a 4-channel continuous machinery protection and monitoring card designed for the \u003cstrong\u003e3500 Series Machinery Detection System\u003c\/strong\u003e. It interfaces directly with Bently Nevada approved positive voltage, third-party pressure transducers (psia) to measure, condition, and analyze cylinder pressure values within reciprocating compressors.\u003c\/p\u003e\n\u003cp\u003eThe primary function of the \u003cstrong\u003e3500\/77M\u003c\/strong\u003e is to deliver continuous machinery protection by cross-referencing processed parameters against software-programmed alarm setpoints to trigger automated system alerts or machinery shutdowns. Simultaneously, it supplies comprehensive proportional physical values (PPLs) required by operations and maintenance engineers to track equipment integrity. Depending on configuration parameters, each channel yields eight distinct PPL values. Five are dedicated to single-chamber metrics (Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, and Compression Ratio), while three are advanced mechanical load calculations derived from cross-channel metrics and physical frame layouts (Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal).\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eQuad-channel architecture supporting up to four independent pressure transducer inputs.\u003c\/li\u003e\n\u003cli\u003eReal-time tracking of eight Proportional Values (PPLs) per active channel for comprehensive cylinder analysis.\u003c\/li\u003e\n\u003cli\u003eBuilt-in machinery protection logic comparing data points directly against configurable alert and danger setpoints.\u003c\/li\u003e\n\u003cli\u003eCoaxial short-circuit protected buffered transducer outputs located on the front panel.\u003c\/li\u003e\n\u003cli\u003eDynamic computing of rod load forces including Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal.\u003c\/li\u003e\n\u003cli\u003eFront-panel status LEDs for local identification of module operation, intra-rack communication, and active bypass status.\u003c\/li\u003e\n\u003cli\u003eFull compatibility with Internal and External Termination Cylinder Pressure I\/O modules.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eReciprocating compressor cylinder monitoring\u003c\/li\u003e\n\u003cli\u003eRod load and rod reversal calculation processing\u003c\/li\u003e\n\u003cli\u003ePetrochemical process gas compressor protection\u003c\/li\u003e\n\u003cli\u003eNatural gas pipeline transmission station monitoring\u003c\/li\u003e\n\u003cli\u003eCritical reciprocating machine diagnostics\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"1\"\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"2\"\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"2\"\u003eBrand\u003c\/td\u003e\n\u003ctd data-row=\"2\"\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"3\"\u003e\u003cstrong\u003eModel\/Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"3\"\u003ePart Number\u003c\/td\u003e\n\u003ctd data-row=\"3\"\u003e140734-07 (3500\/77M)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"4\"\u003e\u003cstrong\u003eInput Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"4\"\u003eSignal Type\u003c\/td\u003e\n\u003ctd data-row=\"4\"\u003e1 to 4 channels of positive voltage third-party pressure transducers (psia)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"5\"\u003e\u003cstrong\u003eTransducer Scale Factors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"5\"\u003e100 psia range\u003c\/td\u003e\n\u003ctd data-row=\"5\"\u003e95,000 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"6\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"6\"\u003e250 psia range\u003c\/td\u003e\n\u003ctd data-row=\"6\"\u003e38,000 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"7\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"7\"\u003e500 psia range\u003c\/td\u003e\n\u003ctd data-row=\"7\"\u003e19,000 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"8\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"8\"\u003e1000 psia range\u003c\/td\u003e\n\u003ctd data-row=\"8\"\u003e9,500 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"9\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"9\"\u003e2500 psia range\u003c\/td\u003e\n\u003ctd data-row=\"9\"\u003e3,800 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"10\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"10\"\u003e5000 psia range\u003c\/td\u003e\n\u003ctd data-row=\"10\"\u003e1,900 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"11\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"11\"\u003e10000 psia range\u003c\/td\u003e\n\u003ctd data-row=\"11\"\u003e950 uV\/psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"12\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"12\"\u003eScale Factor Reference\u003c\/td\u003e\n\u003ctd data-row=\"12\"\u003eAssumes +0.5 Vdc at 0 psia and +10.0 Vdc at full-range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"13\"\u003e\u003cstrong\u003eSignal Conditioning\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"13\"\u003eFrequency Response\u003c\/td\u003e\n\u003ctd data-row=\"13\"\u003e0 to 5.5 kHz on all configured pressure channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"14\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"14\"\u003eInput Impedance\u003c\/td\u003e\n\u003ctd data-row=\"14\"\u003e50 kOhm (Cylinder Pressure I\/O)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"15\"\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"15\"\u003eTemperature at +25 Celsius\u003c\/td\u003e\n\u003ctd data-row=\"15\"\u003eWithin ± 0.5% of pressure transducer full-range (9.5 volts: From +0.5 to +10.0 volts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"16\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"16\"\u003eTemperature over -30 to +65 Celsius\u003c\/td\u003e\n\u003ctd data-row=\"16\"\u003eWithin ± 1.0% of pressure transducer full-range (9.5 volts: From +0.5 to +10.0 volts)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"17\"\u003e\u003cstrong\u003ePower Requirements\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"17\"\u003ePower Consumption\u003c\/td\u003e\n\u003ctd data-row=\"17\"\u003e7.8 Watts, with transducer supplies at full load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"18\"\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"18\"\u003eOK LED\u003c\/td\u003e\n\u003ctd data-row=\"18\"\u003eIndicates when the monitor is operating properly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"19\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"19\"\u003eTX\/RX LED\u003c\/td\u003e\n\u003ctd data-row=\"19\"\u003eIndicates communication with other modules in the 3500 rack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"20\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"20\"\u003eBypass LED\u003c\/td\u003e\n\u003ctd data-row=\"20\"\u003eIndicates when the module is in Bypass Mode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"21\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"21\"\u003eBuffered Transducer Outputs\u003c\/td\u003e\n\u003ctd data-row=\"21\"\u003e1 coaxial connector per channel, short-circuit protected\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"22\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"22\"\u003eBuffered Output Impedance\u003c\/td\u003e\n\u003ctd data-row=\"22\"\u003e550 Ohm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"23\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"23\"\u003eTransducer Power Supply\u003c\/td\u003e\n\u003ctd data-row=\"23\"\u003e+23.0 ± 0.8 Vdc with 24.5 mA current limiting on each channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"24\"\u003e\u003cstrong\u003eEnvironmental Limits\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"24\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd data-row=\"24\"\u003e-30 Celsius to +65 Celsius (-22 Fahrenheit to +150 Fahrenheit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"25\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"25\"\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd data-row=\"25\"\u003e-40 Celsius to +85 Celsius (-40 Fahrenheit to +185 Fahrenheit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"26\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"26\"\u003eHumidity\u003c\/td\u003e\n\u003ctd data-row=\"26\"\u003e95%, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"27\"\u003e\u003cstrong\u003ePhysical Attributes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-row=\"27\"\u003eMonitor Dimensions (H x W x D)\u003c\/td\u003e\n\u003ctd data-row=\"27\"\u003e241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-row=\"28\"\u003e\u003c\/td\u003e\n\u003ctd data-row=\"28\"\u003eMonitor Weight\u003c\/td\u003e\n\u003ctd data-row=\"28\"\u003e0.91 kg (2.0 lbs.)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eInstallation Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Interfacing:\u003c\/strong\u003e Connect only positive voltage, third-party absolute pressure transducers (psia) approved by Bently Nevada with an output range between +0.5 Vdc and +10.0 Vdc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI\/O Buffered Outputs Signal Note:\u003c\/strong\u003e When monitoring via the Cylinder Pressure I\/O module, note that the buffered transducer outputs on the front panel coaxial connectors are inverted and offset by -2.265 Vdc.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTermination Setup:\u003c\/strong\u003e Match the specific configuration to either Internal or External Termination Blocks depending on the designated Cylinder Pressure I\/O module version deployed in the rack slot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMechanical Parameter Entry:\u003c\/strong\u003e Accurate calculation of cross-channel Proportional Values (Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal) requires precise entry of mechanical compressor components in the rack configuration software.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThermal Considerations:\u003c\/strong\u003e Ensure operating ambient conditions around the 3500 rack do not cross the specified threshold limit of -30 Celsius to +65 Celsius.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompliance and Certifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHazardous Area Approvals:\u003c\/strong\u003e CSA\/NRTL\/C\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the core purpose of this module within a 3500 rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module continuously monitors reciprocating compressor cylinder pressures to provide machinery protection and compute essential operating parameters.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many pressure channels does a single module support?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt supports from 1 to 4 independent pressure transducer channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat types of sensors are compatible with the inputs?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt accepts positive voltage, Bently Nevada approved third-party absolute pressure transducers (psia).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat base voltage outputs are assumed for the pressure sensor scale factors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe scale factors assume an absolute baseline voltage of +0.5 Vdc at 0 psia and +10.0 Vdc at the sensor's designated full-scale pressure range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the five single-chamber proportional values calculated by the card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe values are Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, and Compression Ratio.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are the three multi-channel combined parameters calculated?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe parameters include Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many danger setpoints can be configured per channel?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDanger (Overspeed\/Overpressure limit) setpoints can be explicitly mapped to any two of the active proportional values.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the buffered transducer outputs on the front panel modified?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, when using the Cylinder Pressure I\/O module, the front-panel coaxial buffered outputs are inverted and offset by -2.265 Vdc.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the electrical current limit on the integrated sensor power supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module features a +23.0 Vdc power output with a 24.5 mA current limiting function built into each individual channel.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the signal processing frequency response of the pressure card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe module delivers a frequency response of 0 to 5.5 kHz across all active, configured channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes a short circuit on a front-panel buffered output damage the unit?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, all front coaxial buffered transducer connections are fully short-circuit protected.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666520043883,"sku":"140734-07","price":3500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-3500-77m-140734-07-i-o-recip-cylinder-pressure-monitor-rj3dp1htahx_b7413fd4-2415-49db-86cf-d4a2970ff409.jpg?v=1765440144","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-77m-140734-07-recip-cylinder-pressure-monitor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}