{"product_id":"bently-nevada-3500-77m-04-00-143737-01-recip-cylinder-pressure-monitor","title":"Moniteur de pression de cylindre à piston réciproque Bently Nevada 3500\/77M-04-00 143737-01","description":"\u003cp\u003eThe \u003cstrong\u003e3500\/77M\u003c\/strong\u003e, full part number \u003cstrong\u003e3500\/77M-04-00\u003c\/strong\u003e (incorporating main monitor module \u003cstrong\u003e3500\/77M\u003c\/strong\u003e and rear I\/O component \u003cstrong\u003e143737-01\u003c\/strong\u003e), is a 4-channel hardware module engineered within the 3500 Machinery Protection System to condition absolute pressure signals from approved positive voltage third-party transducers installed on reciprocating compressors. The instrument operates via continuous backplane communication to execute machinery protection logic by comparing eight discrete measured variables per channel—specifically Discharge Pressure, Suction Pressure, Maximum Pressure, Minimum Pressure, Compression Ratio, Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal—against user-configurable alert and danger setpoints. This option -04-00 variant is structurally defined by a cylinder pressure I\/O module with external termination interfaces and no hazardous area agency approvals required. The module delivers internal current-limiting transducer power supplies at +23.0 Vdc per channel and outputs inverted, offset buffered analog signals through front-panel coaxial ports for diagnostic cross-analysis without impacting primary monitoring operations.\u003c\/p\u003e\n\u003ch3\u003eOrdering Information\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3500\/77M-04-00: Complete Cylinder Pressure Monitor Assembly\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eSpecifies the combined kit consisting of the front main monitor module and the rear I\/O module.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-04: I\/O Module Type Option\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eCylinder Pressure I\/O Module with External Terminations (Rear I\/O Module Part Number: \u003cstrong\u003e143737-01\u003c\/strong\u003e).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e-00: Agency Approval Option\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003eNo hazardous area agency approvals or certifications required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpares \u0026amp; Accessories\u003c\/strong\u003e\n\u003cul\u003e\n\u003cli\u003ePart Number \u003cstrong\u003e143737-01\u003c\/strong\u003e: Cylinder Pressure I\/O Module with External Terminations for Bently Approved Third-Party Pressure Transducers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHardware Specifications\u003c\/h3\u003e\n\u003cfigure class=\"table\"\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cstrong\u003eParameter\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cstrong\u003eSpecification\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBently Nevada\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel \/ Part Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3500\/77M-04-00 (I\/O Board: 143737-01)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChannel Capacity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4 Configurable pressure channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Signal Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+0.5 Vdc to +10.0 Vdc (assuming +0.5 Vdc at 0 psia)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 kΩ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0 to 5.5 kHz on all configured channels\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePressure Accuracy at +25 °C\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWithin ± 0.5% of pressure transducer full-scale (9.5 V range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePressure Accuracy (-30 °C to +65 °C)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWithin ± 1.0% of pressure transducer full-scale (9.5 V range)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.8 W maximum at full transducer load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBuffered Transducer Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFront panel coaxial ports, inverted and offset by -2.265 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBuffered Output Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e550 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTransducer Power Supply\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e+23.0 ± 0.8 Vdc with 24.5 mA current limiting per channel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-30 °C to +65 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40 °C to +85 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e95%, non-condensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCombined Total Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.11 kg (Combined monitor front card and rear I\/O module)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMonitor Module Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e241.3 mm x 24.4 mm x 241.8 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMonitor Module Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.91 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eI\/O Module Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e241.3 mm x 24.4 mm x 99.1 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eI\/O Module Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.20 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/figure\u003e\n\u003ch3\u003eEngineering Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe cylinder pressure I\/O module processing logic dynamically alters its signal conversion scale factor based on the programmed target range, scaling from 95,000 mV\/psi for 100 psia down to 950 mV\/psi for 10,000 psia systems.\u003c\/li\u003e\n\u003cli\u003eFor single-chamber rod dynamics diagnostics, Peak Rod Compression, Peak Rod Tension, and Degree of Rod Reversal calculations mathematically integrate physical raw casing measurements with internal multi-channel variables.\u003c\/li\u003e\n\u003cli\u003eFront panel buffered coaxial outputs are short-circuit protected but are structurally inverted and offset by -2.265 Vdc when interacting with the external termination I\/O module architecture.\u003c\/li\u003e\n\u003cli\u003eControl logic allows the mapping of independent alert setpoints across all active measured variables, whereas danger setpoints are strictly limited to a maximum of two variables per channel.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eField Guidelines\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConnect the external termination block to the rear I\/O chassis interface via shielded, twisted-pair wiring assemblies to preserve high-frequency signal integrity and prevent noise injection.\u003c\/li\u003e\n\u003cli\u003eTerminate the field transducer cable shields exclusively at the designated external termination block ground strip to avoid creating parallel ground loops with the machine casing ground.\u003c\/li\u003e\n\u003cli\u003eObserve the strict 24.5 mA current-limiting parameters on the +23.0 Vdc internal supply lines when interfacing with third-party absolute pressure sensors.\u003c\/li\u003e\n\u003cli\u003eMaintain minimum bend radius limits for all external field cabling routing into the 3500 chassis enclosure to eliminate mechanical tension on the termination terminal blocks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical \u0026amp; Procurement FAQ\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Why do the front-panel buffered outputs on the 3500\/77M-04-00 show negative voltage offsets on an oscilloscope?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: This behavior is normal for this specific architecture; the cylinder pressure external termination I\/O electronics are structurally designed to invert and offset the raw signal by -2.265 Vdc.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Can this pressure monitor module be swapped or inserted into any random slot within a 3500 rack?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: No, the module must be positioned into a standard chassis slot compatible with monitoring modules and must line up directly with its corresponding 143737-01 rear external termination I\/O board.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is the maximum distance or line resistance supported for the third-party pressure transducer connection?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA: Cable distance limits depend on the specific capacitance of the field cable, but signal integrity over long distances is maintained due to the high 50 kΩ input impedance of the I\/O block.\u003c\/p\u003e","brand":"Bently Nevada","offers":[{"title":"Default Title","offer_id":52666853622123,"sku":"3500\/77M-04-00 143737-01","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-04-00-143737-01-cylinder-pressure-i-o-with-external-terminations-cucl2dsyu4l_d9795dee-d7e1-432c-9d3d-db6e36a719d6.jpg?v=1765449115","url":"https:\/\/www.plcprotech.com\/fr\/products\/bently-nevada-3500-77m-04-00-143737-01-recip-cylinder-pressure-monitor","provider":"PLC ProTech Ltd.","version":"1.0","type":"link"}