{"product_id":"bently-nevada-3500-77m-03-00-143729-01-recip-cylinder-pressure-monitor","title":"Bently Nevada 3500\/77M-03-00 143729-01 Recip Cylinder Pressure Monitor","description":"\u003ch3\u003eDescription\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eBently Nevada 3500\/77M-03-00\u003c\/strong\u003e is a high-performance, 4-channel \u003cstrong\u003eRecip Cylinder Pressure Monitor\u003c\/strong\u003e programmed via the \u003cstrong\u003e3500 Rack Configuration Software\u003c\/strong\u003e to deliver continuous machinery protection and critical diagnostics for reciprocating compressors. This monitoring assembly operates as a unified dual-module system, combining the main front-slot processor with the essential \u003cstrong\u003e143729-01 Cylinder Pressure I\/O Module with Internal Terminations\u003c\/strong\u003e. The system accepts positive voltage, third-party absolute pressure transducer signals (psia) approved by the manufacturer, providing both localized machine protection and high-fidelity transient data for plant operations and maintenance engineering crews.\u003c\/p\u003e\n\u003cp\u003eThe module conditions dynamic pressure waveforms to extract eight distinct measured variables per active channel. Five parameters map specifically to a single compression chamber: Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, and Compression Ratio. An additional three variables integrate multiple channel values alongside geometric compressor parameters to compute advanced thermodynamic and mechanical states: Peak Rod Compression, Peak Rod Tension, and the Degree of Rod Reversal. The rear-mounted \u003cstrong\u003e143729-01\u003c\/strong\u003e I\/O module provides the indispensable physical termination blocks and transducer excitation, making it a critical component of the overall \u003cstrong\u003e3500 Series Machinery Protection System\u003c\/strong\u003e deployment.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eContinuous 4-channel real-time conditioning and dynamic processing of approved positive-voltage pressure inputs.\u003c\/li\u003e\n\u003cli\u003eRequires the \u003cstrong\u003e143729-01\u003c\/strong\u003e rear card to facilitate secure field sensor wiring via internal termination points.\u003c\/li\u003e\n\u003cli\u003eComputes specialized reciprocating variables including rod reversal angles and rod tension\/compression limits.\u003c\/li\u003e\n\u003cli\u003eConfigurable alert setpoints across all measured variables and danger setpoints for any two combined variables per channel.\u003c\/li\u003e\n\u003cli\u003eIntegrated front-panel buffered coaxial connections for unconditioned pressure waveform diagnostics.\u003c\/li\u003e\n\u003cli\u003eFront panel status LEDs provide instantaneous verification of monitor verification states (OK), bus communication activity (TX\/RX), and bypass status.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMulti-chamber dynamic cylinder pressure diagnostics on double-acting reciprocating compressors.\u003c\/li\u003e\n\u003cli\u003eCrosshead pin mechanical stress assessment and rod load calculation in petrochemical processing.\u003c\/li\u003e\n\u003cli\u003eContinuous discharge, suction, and peak pressure tracking on high-pressure refinery gas skids.\u003c\/li\u003e\n\u003cli\u003eReal-time rod reversal confirmation for heavy-duty gas transmission and reinjection machinery.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3500\/77M: Recip Cylinder Pressure Monitor\u003c\/li\u003e\n\u003cli\u003e03: Cylinder Pressure I\/O Module with Internal Terminations\u003c\/li\u003e\n\u003cli\u003e00: None Agency Approval Option\u003c\/li\u003e\n\u003cli\u003e143729-01: Cylinder Pressure I\/O Module Spare (Internal Terminations for Bently Approved Third-Party Pressure Transducers)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eParameter \/ Category\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Details\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eElectrical \u0026amp; Power\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eManufacturer\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eBently Nevada\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCountry of Origin\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eUSA\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003ePower Consumption\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e7.8 Watts maximum (with transducer supplies at full load)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTransducer Power Supply\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e+23.0 +\/- 0.8 Vdc with 24.5 mA current limiting per channel\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eInput Impedance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e50 kOhm (Cylinder Pressure I\/O)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSignal Input \u0026amp; Ranges\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eChannel Capacity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 to 4 channels of approved 3rd-party psia transducers\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTransducer Scale Factors\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\n\u003cp\u003e95,000 mV\/psi for 100 psia range\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e38,000 mV\/psi for 250 psia range\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e19,000 mV\/psi for 500 psia range\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e9,500 mV\/psi for 1000 psia range\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e3,800 mV\/psi for 2500 psia range\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e1,900 mV\/psi for 5000 psia range\u003c\/p\u003e\n\u003cbr\u003e\n\u003cp\u003e950 mV\/psi for 10,000 psia range\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eScale Reference\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eAssumes +0.5 Vdc at 0 psia and +10.0 Vdc at full-range value\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003ePerformance \u0026amp; Accuracy\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFrequency Response\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 5.5 kHz on all configured pressure channels\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAccuracy at +25 degC\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eWithin +\/- 0.5% of full-range (9.5 Volts: From +0.5 to +10.0 Volts)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAccuracy over Temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eWithin +\/- 1.0% of full-range over -30 degC to +65 degC range\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMeasured Variables\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDischarge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio, Peak Rod Compression, Peak Rod Tension, Degree of Rod Reversal\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eSignal Outputs\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBuffered Output Connections\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 short-circuit protected coaxial connector per channel (Front panel)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBuffered Output Impedance\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e550 Ohm\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eBuffered Signal Offset\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eElectronically inverted and offset by -2.265 Vdc\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eEnvironmental Limits\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eOperating Temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-30 degC to +65 degC (-22 degF to +150 degF)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eStorage Temperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e-40 degC to +85 degC (-40 degF to +185 degF)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eAmbient Humidity\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e95% non-condensing\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cstrong\u003eMechanical Dimensions \u0026amp; Weight\u003c\/strong\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cbr\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMain Monitor Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e241.3 mm x 24.4 mm x 241.8 mm (9.50 in x 0.96 in x 9.52 in)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eMain Monitor Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.91 kg (2.0 lb.)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRear I\/O Module Dimensions\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e241.3 mm x 24.4 mm x 99.1 mm (9.50 in x 0.96 in x 3.90 in)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRear I\/O Module Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.20 kg (0.44 lb.)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTotal Assembly Weight\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1.11 kg (2.44 lb.) combined system weight\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRack Space Requirements\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e1 full-height front slot (Monitor) and 1 full-height rear slot (I\/O)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eConnections\/Interfaces\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr class=\"firstRow\"\u003e\n\u003ctd\u003e\u003cstrong\u003eConnector Type \/ Location\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eFunction Assignment\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eFront Panel Coaxial Jacks (1-4)\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDynamic buffered transducer output points for oscilloscope verification\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eRear 143729-01 Screw Terminals\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eField transducer signal inputs and +23.0 Vdc excitation distribution\u003c\/span\u003e\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\u003eDual-Module Pairing:\u003c\/strong\u003e Complete physical installation requires inserting the main processor board into a front chassis slot, and mounting the \u003cstrong\u003e143729-01\u003c\/strong\u003e I\/O module into the rear chassis slot directly behind it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChassis Slot Selection:\u003c\/strong\u003e The front slot must be a full-height monitoring position (slots 2 through 15). Slots 0 and 1 are strictly reserved for power and rack interface modules.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransducer Shielding:\u003c\/strong\u003e Wire all third-party pressure sensors using high-quality twisted-pair shielded cable. Connect the shielding braid exclusively to the dedicated chassis ground terminals on the \u003cstrong\u003e143729-01\u003c\/strong\u003e card.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExcitation Load Verification:\u003c\/strong\u003e Ensure the combined power draw of the external sensors does not trigger the 24.5 mA current limiting safety threshold on any individual channel.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignal Offset Awareness:\u003c\/strong\u003e Note that dynamic waveform diagnostic data collected from the front panel coaxial connectors is electronically inverted and offset by -2.265 Vdc due to the internal routing architecture of the rear I\/O module.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the function of the 3500\/77M-03-00 module system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt monitors dynamic cylinder pressure profiles and rod loads to protect and diagnose industrial reciprocating compressors.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy is the 143729-01 rear card necessary for this system?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe 143729-01 is the mandatory Cylinder Pressure I\/O module that houses the physical field wiring terminals and sensor power circuits.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow many sensor input channels does this combined module assembly support?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe monitor system provides processing infrastructure and termination blocks to handle 1 to 4 independent transducer lines.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat types of pressure sensors can be wired to the 143729-01 card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt is built specifically to accept approved positive-voltage third-party transducers calibrated in absolute pressure metrics (psia).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich parameter calculations require the input of physical machine dimensions?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eCalculations for Peak Rod Compression, Peak Rod Tension, and the Degree of Rod Reversal integrate real-time waveforms with stored mechanical geometry data.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the power specification for sensor excitation on the rear card?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe rear module delivers +23.0 +\/- 0.8 Vdc on each channel, protected by a 24.5 mA current limiting circuit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat standard input electrical impedance value is present on the I\/O channels?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe hardware channels feature a nominal internal electrical input impedance rating of 50 kOhm.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the front panel buffered coaxial outputs identical to the raw sensor input wave?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo, the front buffered outputs are electronically inverted and offset by -2.265 Vdc by the cylinder pressure I\/O module routing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the maximum signal frequency response of the pressure tracking channels?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe continuous frequency response range extends from 0 to 5.5 kHz across all active channels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan the complete monitor assembly operate in sub-zero environments?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, the front module and the rear I\/O card are fully specified to operate in ambient industrial environments down to -30 degC.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666862043499,"sku":"3500\/77M-03-00 143729-01","price":100.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/3227\/0443\/files\/bently-nevada-3500-77m-03-00-143729-01-cylinder-pressure-i-o-with-internal-terminations-a4hcfix1rtr_70697f2e-142e-46bd-b575-fdadfa683f96.jpg?v=1765449329","url":"https:\/\/www.plcprotech.com\/products\/bently-nevada-3500-77m-03-00-143729-01-recip-cylinder-pressure-monitor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}