Description
Bently Nevada 133827-02 RTD/TC Temperature I/O Module
The Bently Nevada 133827-02, also cataloged as the 133827-02 RTD/TC Temperature I/O Module, serves as the primary temperature input/output module utilized to execute multi-channel RTD and thermocouple signal acquisition across 3500 Series 3500/61 Temperature Monitor platforms. The module provides direct electrical conditioning of up to six temperature sensor inputs for alarm, trip, and continuous monitoring functions within rack-based machinery protection systems.
Hardware Specifications
| Parameter |
Specification |
| Model |
133827-02 |
| Brand |
Bently Nevada |
| Weight |
0.46 kg |
| Dimensions |
2.5 x 24.1 x 10.2 cm |
| Operating Temp |
-30 deg C to +65 deg C |
| Storage Temperature |
-40 deg C to +85 deg C |
| Power Consumption |
~9 W (via 3500 rack backplane) |
| Channels |
Up to 6 configurable inputs |
| Sensor Types |
RTD (Pt100, Pt1000, Ni120, Cu10), TC (J, K, E, T, B, R, S, N) |
| Isolation |
Non-isolated |
| Accuracy |
±0.5 deg C (RTD), ±1.0 deg C (TC) |
| Resolution |
0.1 deg C |
| Rack Compatibility |
3500/05, 3500/15, 3500/22M |
Bently Nevada RTD/TC Signal Conditioning and Channel Behavior
The 133827-02 module performs multi-sensor temperature acquisition through direct termination of RTD and thermocouple inputs via external screw terminals. Signal conditioning is executed at the 3500 rack processing level, with analog conversion referenced to backplane power distribution.
As a non-isolated architecture, all six input channels share a common electrical reference, requiring strict grounding discipline to prevent measurement offset caused by common-mode interference. Thermocouple inputs rely on stable reference junction compensation handled within the monitoring chain, while RTD channels depend on lead resistance stability for accurate conversion.
Channel multiplexing supports configurable input mapping, allowing mixed RTD and thermocouple configurations within a single module slot. Diagnostic routines detect open-circuit, short-circuit, and out-of-range conditions at the input stage before alarm propagation.
Frequently Asked Questions (FAQ)
Q: Does the 133827-02 provide galvanic isolation between input channels?
A: No. The module is non-isolated, and all input channels share a common reference within the 3500 backplane architecture.
Q: Can RTD and thermocouple inputs operate simultaneously on different channels?
A: Yes. Each channel is independently configurable for RTD or thermocouple measurement types.
Q: What happens if a thermocouple wire becomes open circuit?
A: The module detects open-circuit conditions through diagnostic thresholds and reports an out-of-range temperature fault to the monitoring system.
Field Installation Guidelines
The module must be installed into a compatible Bently Nevada 3500 rack slot with full backplane engagement verified prior to energization. Proper seating is required to ensure stable power distribution and signal referencing.
Field wiring for RTD and thermocouple inputs shall be routed using shielded twisted pairs. For thermocouples, correct polarity must be maintained at screw terminal interfaces. Shield termination must be implemented at a single grounding point within the control cabinet to minimize ground loop formation.
Due to non-isolated channel architecture, routing of sensor wiring must be physically separated from high-voltage and switching conductors to avoid induced measurement error.
