Bently Nevada 3500/61 Non-Isolated RTD & TC Temperature I/O Module Specification

133819-02 is the original factory non-isolated temperature terminal I/O module exclusively matched with Bently Nevada 3500/61 temperature monitor main card, belonging to core accessory of 3500 series turbomachinery TSI protection system. Differentiated from 133819-01 which pairs with 3500/60 non-recorder-output mainboard, this 133819-02 is designed with built-in circuit for independent 4–20mA analog recorder output per measuring channel, retaining six universal signal acquisition channels supporting mixed wiring of RTD and thermocouple field sensors. Adopting standard half-height installation specification compatible with 3500/05 19-inch instrument rack, it completes on-site temperature signal conditioning, conversion and data transmission together with 3500/61 main monitor for bearing bush, motor stator winding and lubricating oil pipeline temperature detection of steam turbine, centrifugal compressor and large auxiliary rotating equipment. The module complies with API670 rotating machinery protection standard, CE EMC, ATEX Zone2 and CSA hazardous area certification norms, widely deployed in thermal power, petrochemical refining, offshore oil & gas exploitation and metallurgical industry for complete temperature monitoring cabinet assembly. It features internal integrated termination circuit without external matching resistance, simplifying field wiring construction compared with split-termination isolated I/O variants.

This module contains six independent configurable measuring channels, programmable via official 3500 rack configuration software to switch between RTD resistance input or multi-type thermocouple millivolt input, allowing mixed arrangement of different sensor types across six channels to satisfy diversified on-site temperature measurement demands. For RTD measurement, built-in precision constant current source outputs fixed 925±15μA excitation current to minimize measuring error caused by field cable resistance fluctuation; integrated cold-junction compensation circuit for thermocouple automatically offsets ambient temperature drift to maintain stable measuring precision within ±3°C under 25°C reference working condition. The core distinguished feature versus 133819-01 lies in independent channel-wise 4–20mA analog recorder output: each of six channels is equipped with isolated analog output circuit, converting real-time collected temperature value into standard 4–20mA current signal for direct access to DCS distributed control system, paperless recorder and on-site secondary display instrument without extra signal conversion accessories. After processing original sensor signals, the module transmits digital temperature data through rear gold-plated backplane connector to rack internal bus for 3500/61 mainboard to execute threshold comparison and fault alarm judgment; front panel retains OK, TX/RX and Bypass three status indicator LEDs for quick on-site troubleshooting without auxiliary testing tools. The whole module draws working power uniformly from 3500 rack backplane 24VDC bus with nominal total power consumption around 7W, requiring no standalone external power supply for normal operation.

133819-02 follows unified half-height dimensional specification of Bently 3500 rack system, overall outer dimension is 242mm × 112mm × 26mm with net product weight about 0.52kg. Front panel adopts consistent matte blue electrostatic baking finish same as all other 3500 series functional modules to realize uniform cabinet appearance after rack installation; bilateral elastic locking buckles support tool-free plug-in mounting and removal inside designated half-height slot of standard 3500/05 rack, effectively preventing module loose displacement induced by long-term mechanical vibration of operating equipment and cabinet transportation impact. Rear side is fitted with multi-point gold-plated backplane connector for reliable electrical docking with rack internal power and data bus; module lateral side is reserved with dense green pluggable terminal blocks for direct wiring connection of field RTD and TC sensor cables as well as 4–20mA recorder output signal cables leading to DCS cabinet. Internal main PCB circuit board is fixed with shock-absorbing rubber cushion to strengthen anti-vibration and anti-shock performance under high-dust, high-humidity industrial site environment. Brand-new original spare modules are individually sealed with anti-static shielding bag and shockproof foam packaging to avoid static breakdown, circuit scratch and surface coating damage during cross-region logistics transportation and long-term warehouse storage.

Supported sensor specification range: RTD compatible types cover Pt100, Pt120, Pt200, Pt500, Pt1000; applicable thermocouple includes industrial standard Type E, J, K, T, B, R, S and N series. Each measuring channel input impedance exceeds 10MΩ per lead to suppress stray induced interference from long-distance field transmission cables; per-channel 4–20mA recorder output features maximum permissible load resistance up to 600Ω under rated load voltage condition. Rated continuous operating ambient temperature after rack installation ranges from 0°C ~ +65°C; allowable short-time transient working temperature spans -35°C ~ +72°C adapting occasional cabinet abnormal heat dissipation failure; spare storage temperature scope covers -40°C ~ +85°C under dry, dust-free and non-corrosive gas warehouse storage environment. Applicable working relative humidity is limited to 5%RH~95%RH with strict non-condensing requirement, suitable for coastal offshore platform salt fog environment, high-corrosion petrochemical workshop and dusty metallurgical factory control cabinet installation scenarios. The finished module passes full industrial sweep vibration test of 10Hz~1500Hz to guarantee no internal component loose soldering and measuring parameter drift under continuous vibration condition, obtaining CE, ATEX Zone2 and CSA certification for Class I Div2 hazardous area explosion-proof cabinet installation application.

133819-02 can only match with Bently Nevada 3500/61 main temperature monitoring card with recorder output function, incompatible with 3500/60 mainboard without analog output function and isolated-type TC dedicated I/O modules of the same series. It is fully mechanically and electrically compatible with standard 3500/05 19-inch installation rack, able to be assembled side by side with 3500/40M proximity monitor card, 3500/42M seismic vibration monitor card and other full/half-height functional modules inside one rack to realize synchronous collection of equipment vibration and multi-point temperature physical quantity data for integrated machinery protection configuration. Primary application fields include coal-fired power station, gas power generation, onshore & offshore oil refining, coal chemical processing and heavy metallurgy industry, focusing on real-time temperature monitoring of turbine bearing pad, compressor thrust bearing, large motor stator winding and unit lubricating oil pipeline, delivering over-temperature early warning interlock trigger signal for safe unit operation and feeding corresponding analog temperature data to upper-level centralized control system via its exclusive 4–20mA output channel. During later project technical modification and rack capacity expansion, idle half-height slots covered by blank baffle can be directly replaced with this module to add new temperature measuring points without modifying original cabinet wiring layout and rack structure.

Every finished 133819-02 undergoes full-channel RTD/TC signal aging test, per-channel 4–20mA analog output precision calibration, terminal continuity inspection and dimensional tolerance verification before factory delivery, all original test records and inspection reports are archived for complete product quality traceability. Original manufacturer standard limited warranty period is twelve months counted from formal product delivery date to end user; products with inherent factory manufacturing defects under standardized installation specification, specified working environment and non-artificial damage qualify for free replacement service within valid warranty term. Damage caused by on-site wrong sensor wiring, external overvoltage surge impact, violent forced plugging and unauthorized internal circuit disassembly modification is excluded from official warranty coverage, all relevant maintenance and component replacement expenses shall be fully borne by purchaser independently.