The BENTLY NEVADA 135489-01 I/O Module is an input/output module manufactured by BENTLY NEVADA, which is part of the 3500 series monitoring system.The model number is 3500/42M, and the part number is 135489-01. It is a four-channel proximity seismic monitor input/output module that accepts input signals from proximity sensors and seismic sensors.
Basic Information
Model: 135489-01
Functional Positioning: As the rear card (isolated I/O module) of the 3500/42M, it provides electrical isolation and explosion-proof functionality, responsible for transmitting preprocessed signals from the front card to upper-level systems or relay modules to achieve alarm output, data communication, and power management.
Matching Relationship: Must be used in conjunction with a front card (e.g., 176449-02), achieving signal interaction through the rack backplane, suitable for explosion-proof environments.
135489-01, as the isolated rear card (I/O module) of the 3500/42M, incorporates built-in barriers to achieve electrical isolation between input and output signals. Specifically, the Proximitor barrier has a power supply terminal with 26.80V voltage, 112.8mA current, and 237.6Ω resistance, while the signal terminal features 14.05V voltage, 2.82mA current, and 4985Ω resistance. The seismic barrier has a voltage of 27.25V, current of 91.8mA, and resistance of 297Ω. It holds explosion-proof certifications including cNRTLus (Class I, Zone 2/Division 2, -20°C to +65°C) and ATEX/IECEx (II 3(1)G Ex nA nC ic [ia Ga] IIC T4 Gc).
Its output interfaces support connection to 3500/32,3500/33,3500/34 relay modules to implement dual-threshold alarms (Alert and Danger), provide independent +4 to +20mA analog outputs per channel (with 0-600Ω load and short-circuit protection), and enable digital communication via the rack backplane supporting protocols like Modbus and Profibus. Alarm delays can be set as 1-60 seconds for alerts and 0.1 seconds or 1-60 seconds (with 0.5-second intervals, up to 400 seconds for REBAM).
Mechanically, it measures 241.3×24.4×163.1mm, weighs 0.46kg, and is installed in the rear slot of the rack. It operates in an environment with a working temperature of 0°C to +65°C, storage temperature of -40°C to +85°C, and 95% non-condensing humidity, meeting industrial seismic standards.
Recommended to be paired with the 176449-02 front card, where the front card is responsible for signal acquisition and preprocessing in non-explosion-proof environments, and the rear card transmits isolated signals to external systems in hazardous areas or complex electromagnetic environments through electrical isolation and explosion-proof certification. Together, they form a complete monitoring and protection unit, suitable for explosion-proof and high-interference scenarios such as petroleum and chemical industries.
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