Bently Nevada 3500/60 Non-Isolated RTD & TC Temperature I/O Module Specification

133819-01 is the original front-end input module matched for Bently Nevada 3500/60 temperature monitoring card, belonging to core accessory component of the 3500 series turbomachinery TSI protection system, specially designed as non-isolated type terminal I/O board for six-channel RTD and thermocouple temperature signal collection. This module adopts half-height installation specification consistent with the unified mechanical standard of 3500/05 instrument rack, working cooperatively with 3500/60 main monitor card to complete field temperature sensor signal conditioning, data conversion and real-time temperature acquisition for key equipment such as bearing bush, stator coil and pipeline medium of large rotating machinery. Differentiated from isolated TC version modules, this 133819-01 variant features built-in internal termination circuit without extra external matching resistance wiring, supporting mixed access of multiple types of RTD and thermocouple sensors at the same six measurement channels, and complies with API670 machinery protection standard, CE EMC, ATEX Zone2 and CSA industrial safety certification norms. It is extensively configured in thermal power plants, petrochemical refining, offshore oil & gas exploitation and metallurgical industries for temperature monitoring cabinet assembly of steam turbine, centrifugal compressor, induced draft fan and feedwater pump units.

First, the module provides six independent universal measuring channels, which can be flexibly configured via 3500 rack upper computer configuration software to receive either RTD resistance temperature signal or multi-type thermocouple voltage signal, allowing mixed wiring layout of different sensor types among six channels to satisfy diversified field temperature measurement requirements. Built-in fixed precision constant current source outputs 925±15μA excitation current for RTD loop measurement, effectively reducing measuring deviation caused by line resistance variation; for thermocouple input, integrated cold-junction compensation circuit automatically eliminates ambient temperature drift error to guarantee long-term stable measuring accuracy with typical precision within ±3°C under 25°C reference environment. Secondly, this non-isolated structural model integrates all required termination resistors inside circuit, removing the need of external terminal matching components and simplifying on-site field wiring construction work compared with separated termination design products. Thirdly, the module transmits processed temperature digital data to 3500 backplane bus for main monitor card to conduct threshold comparison and fault alarming judgment; front panel is equipped with three status indicator LEDs of OK, TX/RX and Bypass, enabling field maintenance personnel to rapidly judge power supply state, data communication condition and channel bypass status directly from cabinet surface without auxiliary testing equipment. In addition, matched with 3500/61 monitor card variant, the module supports corresponding 4–20mA analog recorder output signal transmission per channel for access to DCS centralized control system and paperless recorder equipment. The whole module consumes nominal 7W power supplied uniformly from rack backplane power bus, no independent external power source is required for operation.

133819-01 follows standard half-height dimensional specification of Bently 3500 rack series, overall outer dimension is 242mm × 112mm × 26mm with net product weight around 0.46kg. Front panel is finished with unified matte blue electrostatic spray coating same as other 3500 series functional modules, matching the overall appearance layout of full cabinet after rack assembly; bilateral elastic clamping buckles realize tool-free plug-in installation into designated half-height slot of 3500/05 rack, preventing loose displacement triggered by long-term mechanical vibration of on-site running equipment and cabinet transportation impact. Rear side is fitted with gold-plated multi-point backplane connector for stable electrical docking with rack internal bus to complete power supply and digital signal interaction with main monitoring card; one side of module body is reserved with dense terminal wiring terminals for direct field cable access of RTD and TC sensor leads. Internal PCB circuit board is fixed with damping cushion structure to strengthen anti-shock performance under harsh industrial working conditions; finished original spare modules are individually packaged with anti-static shielding bag and shockproof foam to avoid static breakdown, circuit scratch and surface paint peeling during cross-region transportation and long-term warehouse storage.

Supported sensor scope: RTD types include Pt100, Pt120, Pt200, Pt500 and Pt1000; thermocouple covers Type E, J, K, T, B, R, S and N conventional industrial specifications. Input impedance of each measuring channel exceeds 10MΩ per lead to restrain interference from stray induced voltage of field long-distance transmission cable; every channel’s recorder output is standard 4–20mA analog signal with maximum load resistance up to 600Ω under 0–12VDC load voltage compliance condition. Rated continuous operating ambient temperature after cabinet installation ranges from 0°C to +65°C; allowable short-time transient working temperature spans -35°C ~ +72°C coping with accidental cabinet abnormal heat dissipation; spare storage temperature scope covers -40°C ~ +85°C under dry, dustproof and non-corrosive gas storage environment. Applicable working relative humidity is 5%RH~95%RH with strict non-condensing requirement, adapting high-humidity coastal offshore platform salt fog environment and corrosive atmosphere inside petrochemical plant control room. The finished product passes complete industrial vibration durability testing of 10Hz~1500Hz continuous frequency sweep vibration without internal component loose soldering and parameter drift, obtaining CE, ATEX Zone2 and CSA certification for installation in Class I Div2 hazardous area explosion-proof cabinet.

133819-01 is fully compatible with standard 3500/05 19-inch installation rack, exclusively matching 3500/60 non-recorder output and 3500/61 recorder output temperature main monitoring cards of Bently Nevada 3500 system, unable to be interchanged with isolated TC version I/O modules with channel-to-channel isolation function. It can be assembled side by side with vibration monitoring cards like 3500/40M proximity monitor and 3500/42M seismic monitor in the same rack to realize synchronous collection of equipment vibration and temperature dual physical quantity data for comprehensive machine condition protection configuration. Core application fields cover coal-fired power, gas-fired power generation, onshore and offshore oil refining, coal chemical processing and heavy metallurgy industry, mainly applied to real-time temperature monitoring of turbine bearing pads, compressor thrust bearings, motor stator winding and equipment auxiliary lubricating oil pipeline, providing over-temperature early warning and interlock protection trigger signal for unit safe operation. During later project renovation and rack expansion, idle half-height slots filled with blank cover plates can be replaced with this module to expand new temperature measuring points without modifying original rack cabinet structure.

Each finished 133819-01 undergoes full-channel signal input aging test, precision calibration of RTD/TC measuring circuit, terminal continuity inspection and dimensional tolerance detection before factory delivery, all test data is archived with original factory inspection report for product quality traceability. Original manufacturer standard limited warranty lasts twelve months calculated from the formal delivery date to end customer; products with inherent factory manufacturing defects under specified installation specification and normal working environment without artificial damage are eligible for free replacement service within valid warranty period. Damage caused by wrong wiring of field sensor, overvoltage surge impact, forced violent plugging and disassembly modification of internal circuit is excluded from official warranty coverage, all relevant maintenance and replacement costs shall be fully undertaken by the purchaser.