1. Overview
Designed with standard plug-in mechanical structure fully compatible with universal Ovation control rack backplanes, this module supports 2-wire, 3-wire and 4-wire RTD wiring modes. It automatically compensates measurement errors caused by long field cable resistance, converts resistance changes corresponding to temperature fluctuations into standard digital temperature data, and uploads measurement results to the local DPU through the internal backplane bus. Every module undergoes strict multi-point temperature calibration and factory burn-in aging testing to ensure long-term stability, low drift and reliable temperature acquisition performance.
2. Core Functional Features
2.1 Multi-Spec RTD Compatibility
Supports mainstream industrial platinum thermal resistances including PT100 and PT1000; flexible configuration for 2-wire, 3-wire and 4-wire wiring schemes, built-in automatic lead resistance compensation function to eliminate measurement deviation induced by long-distance signal cables.
2.2 Independent Channel Galvanic Isolation
Each temperature input channel adopts isolated circuit design, completely separating the field sensor loop and DCS internal control circuit. It suppresses ground potential difference and complex electromagnetic interference, and prevents abnormal external voltage backfeed from damaging the rack backplane and DPU main controller hardware.
2.3 Intelligent Sensor Fault Diagnosis
Real-time automatic identification of RTD open circuit, short circuit, wire breakage and out-of-range resistance faults. The faulty channel will be marked independently with an alarm flag, without affecting normal temperature collection of other channels on the module.
2.4 Multi-Layer Built-In Protection
Integrated transient surge absorption, input overvoltage clamping and reverse wiring protection components, adapting to complicated on-site wiring environments and effectively resisting instantaneous voltage spikes coupled into long transmission cables.
2.5 Hot-Swap Online Maintenance
Live hot swapping is available during normal DCS continuous operation; module replacement will not interrupt temperature acquisition of remaining channels or impact critical equipment overtemperature interlock protection logic.
2.6 Full Onboard Real-Time Self-Diagnosis
Continuously monitors internal power supply anomalies, backplane communication timeouts and channel measurement overloads. Fault codes and alarm information can be remotely uploaded to the Ovation operator workstation; front panel LEDs provide local intuitive status indication for fast on-site troubleshooting.
2.7 Native System Compatibility
Fully compatible with full-series Ovation DPUs and standard I/O racks. No additional adapter boards or backplane reconstruction modifications are required during installation, suitable for new project construction and spare part replacement for legacy unit renovation projects.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack plug-in installation
Supported Sensors: PT100, PT1000 platinum thermal resistance
Wiring Options: Configurable 2-wire / 3-wire / 4-wire
Power Supply: DC power fed from rack backplane, no external auxiliary wiring needed
Isolation Mode: Independent galvanic isolation per channel
Operating Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Compliance: Complies with industrial G3 anti-corrosion standard and anti-interference requirements for power plant control cabinets
4. Front Panel LED Indicator Definition
PWR (Green LED): Steady ON = module internal power supply normal; OFF = power loss or blown internal fuse
CH ACT (Green LED): Flashes when the corresponding channel acquires valid temperature signals normally
COMM (Green LED): Blinking = normal data interaction with local DPU and backplane bus
FAULT (Red LED): Illuminates on sensor open/short circuit, hardware damage or communication interruption; fault status is latched for maintenance confirmation
5. Application Scope
Thermal Power Industry
Collect boiler furnace wall temperature, flue gas temperature, bearing temperature of fans, water pumps and pulverizers, as well as steam pipeline medium temperature, to realize equipment temperature monitoring and overtemperature interlock protection.
Petrochemical Industry
Measure reactor shell temperature, temperature of each tray in fractionating columns, and inlet & outlet medium temperature of heat exchangers, stabilizing key process parameters and guaranteeing continuous safe operation of process units.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Complete real-time temperature collection for heating furnaces, kiln bodies and heat supply pipelines, supporting long-cycle unattended stable operation of the entire production line.
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