BENTLY 125720-01

Description

Detailed parameter table

BENTLY 125720-01

Product introduction

The 125720-01 from Bently Nevada is a precision temperature transmitter module designed to integrate seamlessly into 3500 Machinery Protection Systems. This compact module converts raw temperature signals from RTDs and thermocouples into standardized 4-20 mA outputs, enabling accurate temperature monitoring of critical machinery components. Bently Nevada’s 125720-01 acts as a vital measurement bridge, transforming thermometric data from industrial sensors into reliable signals that flow through the 3500 ecosystem to 3500/61 display modules and other monitoring components.

Bently Nevada’s 125720-01 addresses the need for accurate temperature measurement in machinery protection applications, where thermal conditions often indicate early-stage faults or performance degradation. Its multi-channel design allows simultaneous monitoring of multiple critical points—such as bearing housings, motor windings, and lubrication systems—providing comprehensive thermal profiles that complement vibration data from other 3500 components. By delivering precise temperature data to 3500/61 displays, this module enables operators to detect abnormal heating patterns that precede mechanical failures.

Core advantages and technical highlights

Multi-sensor compatibility: The 125720-01 supports both RTDs (Pt100, Pt1000) and thermocouples (J, K, T, E types) across four independent channels, providing exceptional flexibility in temperature measurement setups. This versatility allows the module to integrate with existing temperature sensor installations while accommodating future upgrades or changes in measurement requirements.

Laboratory-grade accuracy: With ±0.1°C accuracy for RTD inputs and ±0.5°C for thermocouples, the module delivers measurement precision that exceeds industrial standards. This level of accuracy is critical for detecting subtle temperature trends that indicate developing issues—such as bearing degradation or insulation breakdown—long before they become catastrophic failures.

Advanced signal conditioning: Incorporating cold junction compensation, linearization, and noise filtering, the 125720-01 ensures reliable temperature measurement even in electrically noisy industrial environments. Its channel isolation prevents cross-talk between inputs, maintaining measurement integrity when monitoring both high-temperature and ambient conditions in close proximity.

Seamless system integration: The module’s 4-20 mA outputs directly interface with 135137-01 input modules and other 3500 components, while its DIN rail mounting design simplifies installation in control cabinets. Temperature data flows seamlessly to 3500/61 display modules, where it is visualized alongside vibration and other machinery health parameters for comprehensive condition monitoring.

Typical application scenarios

In power generation turbine systems, the 125720-01 monitors temperatures at critical points including generator stator windings, turbine bearing housings, and lubrication oil supply lines. Connected to Pt100 RTDs embedded in these components, the module converts resistance measurements into standardized signals that are transmitted to 135137-01 input modules. Temperature data appears alongside vibration readings on 3500/61 displays, enabling operators to detect thermal anomalies that indicate bearing distress or cooling system issues.

Oil refineries utilize the 125720-01 in compressor train monitoring, where it tracks temperatures of gearbox bearings, motor windings, and process gas coolers. Using K-type thermocouples for high-temperature locations and RTDs for precision measurements, the module provides a complete thermal profile of compression equipment. Abnormal temperature rises detected by the module trigger alerts on 3500/61 displays, prompting maintenance before mechanical damage occurs.

Manufacturing facilities deploy the 125720-01 on production line machinery, monitoring motor temperatures, hydraulic system fluid conditions, and oven heating elements. Its multi-channel capability allows comprehensive temperature monitoring of interconnected equipment, with data integrated into 3500/61 displays alongside vibration and pressure measurements. This integration helps maintenance teams distinguish between normal operational heating and problematic temperature patterns that indicate impending failures.

BENTLY 125720-01

Related model recommendations

3500/61 (Bently Nevada): Display module visualizing temperature data from 125720-01.

135137-01 (Bently Nevada): Signal input module receiving outputs from 125720-01.

3500/34 (Bently Nevada): Communication gateway transmitting data from 125720-01.

3500/05-01-02-00-00-01 (Bently Nevada): Power supply for the 125720-01 module.

163179-02 (Bently Nevada): Extension cable connecting sensors to 125720-01.

133396-01 (Bently Nevada): Accelerometer for complementary vibration monitoring.

330130-080-00-00 (Bently Nevada): Calibration fixture for 125720-01 verification.

3500/70M (Bently Nevada): Recip monitor with integrated temperature monitoring capabilities.

Installation, configuration and maintenance instructions

Installation preparation: Before installing the 125720-01, verify compatibility with connected sensors (RTDs or thermocouples) and downstream modules like the 135137-01. Select a mounting location within the -40°C to +70°C operating range with protection from moisture and excessive vibration. Required tools include a screwdriver set, wire strippers, torque wrench, and laptop with configuration software. Inspect the module for shipping damage, checking for loose components or damaged connectors.

Mounting and wiring: Install the 125720-01 on a standard DIN rail or via panel mount holes, ensuring secure attachment. Connect 24 VDC power from the 3500/05-01-02-00-00-01 supply, observing correct polarity. Wire RTD or thermocouple inputs using appropriate cable types (shielded twisted-pair for RTDs, thermocouple-grade wire for thermocouples), connecting to the labeled terminal blocks. Run 4-20 mA output wiring to receiving equipment, using twisted-pair cable for noise immunity. Ground cable shields at the module end only.

Configuration procedures: Power on the system and establish communication with the 125720-01 via USB or network connection. Configure each channel for the specific sensor type (RTD or thermocouple), setting appropriate temperature ranges and output scaling. Enable cold junction compensation for thermocouple inputs. Configure alarm thresholds for high/low temperature conditions if supported by the receiving system. Verify calibration using a precision temperature reference source before commissioning.

Maintenance suggestions: Include the 125720-01 in semi-annual maintenance checks, verifying power supply voltage, output signal integrity, and connection security. Inspect sensor wiring for signs of corrosion, particularly for thermocouple connections which are susceptible to oxidation. During scheduled shutdowns, recalibrate the module using the 330130-080-00-00 fixture to ensure measurement accuracy. Clean ventilation openings to prevent dust accumulation. If temperature drift is detected, check for loose connections or sensor degradation before suspecting module failure.

Service and guarantee commitment

Bently Nevada provides the 125720-01 with a 30-month warranty covering manufacturing defects and performance issues under normal operating conditions, including measurement accuracy and channel isolation. Our technical support team offers expert guidance on proper installation, sensor selection, and integration with 3500/61 display modules, 135137-01 input modules, and 3500/34 communication gateways.

We offer specialized training on temperature measurement principles, transmitter configuration, and calibration techniques specific to the 125720-01. Beyond the warranty period, our service agreements include calibration verification, performance testing, and expedited replacement services to minimize downtime. Bently Nevada’s commitment to quality ensures the 125720-01 delivers reliable temperature monitoring throughout its operational lifecycle, backed by our global network of service professionals and application engineers.