Overview
The Foxboro RTT20-D1MLQCD-D2L3 is a microprocessor-based intelligent temperature transmitter in the I/A Series family. This transmitter accepts input signals from RTDs, thermocouples, ohm sensors, or DC millivolt sources, converting them to a standard 4-20mA output signal. The RTT20 platform supports multiple communication protocols including HART, FOUNDATION Fieldbus H1, and PROFIBUS PA, making it highly versatile for legacy and modern automation systems.
Key Features
- Microprocessor-based intelligent design with self-diagnostics and self-calibration
- Multiple input types: RTD (2-, 3-, or 4-wire), thermocouple, ohm, and mV sources
- Standard 4-20mA output with optional HART or fieldbus communication
- Remote configuration via hand-held communicator or PC-based configurator
- Wide range of housing options including DIN rail, pipe mount, and integral sensor configurations
- Maximum/minimum temperature logging and data recording capability
Technical Specifications
- Series: RTT20 I/A Series
- Transmitter Type: Intelligent Temperature Transmitter
- Output: 4-20mA standard; selectable with HART or fieldbus
- Power Supply: 12-42VDC typical (verify for specific model)
- Input Signals: RTDs (Pt100, Pt1000), J/K/E/R/S/T thermocouples, ohm sensors, ±50mV DC
- Accuracy: ±0.05% of reading (fieldbus), ±0.05% of span (HART)
- Communication Protocols: HART, FOUNDATION Fieldbus H1, PROFIBUS PA
- RTD Support: 2-wire, 3-wire, 4-wire configurations
- Diagnostics: Automatic self-diagnostics and self-calibration
- Operating Features: Temperature min/max logging, redundant measurement capability (fieldbus versions)
Typical Applications
The RTT20-D1MLQCD-D2L3 is commonly used in:
- Chemical processing and petroleum refining temperature monitoring
- HVAC and building automation systems
- Food and beverage production temperature control
- Power generation and steam system management
- Water treatment and environmental monitoring
- Remote pipeline and utility temperature measurement
Compatibility & Replacements
Compatible With
- Foxboro I/A Series control systems and host networks
- HART-enabled control systems and asset management platforms
- FOUNDATION Fieldbus H1 networks and gateways
- PROFIBUS PA networks and master stations
- Standard 4-20mA analog input modules on most PLCs and RTUs
- Hand-held HART communicators and configuration devices
Replaces / Drop-In Replacement For
The RTT20-D1MLQCD-D2L3 is a direct replacement for other RTT20 transmitters with similar input/output configurations. Verify sensor type (thermocouple designation, RTD range) and housing style match your existing installation before ordering. Related RTT20 variants include RTT20-D1LJQCD, RTT20-T1LJQCA, and other -D2L3 style models.
Works With
- Foxboro I/A Series DCS and operator stations
- HART communication handhelds and software configurators
- OPC servers and third-party SCADA systems supporting HART
- FOUNDATION Fieldbus H1 wiring and network devices
- PROFIBUS PA master devices and fieldbus couplers
- Standard analog RTU and PLC input cards (4-20mA)
