nRTM4048 Network Thermocouple Conditioner/Multiplexer

The nRTM-4048 is a network-based 48-channel thermocouple conditioner/multiplexer unit. The nRTM-4048 unit accepts direct input thermocouple wiring, provides electronic cold junction compensation, real-time data linearization, and compatibility with ANSI thermocouple types J, K, T, E C and S (N Dash 2), all within a single enclosure. Thermocouple data is digitized up to 16-bit resolution. Channel sample sequence and conditioning parameters are programmed and controlled by the unit’s overhead card, which is user-programmable via the network interface using TTCWare.

Data acquired and encoded by the nRTM-4048 is formatted as a data packet for output over the network bus using NPD data packet format. The nRTM-4048 is a ruggedized, fixed-volume enclosure suitable for use in harsh environments and over a wide temperature range. Thermocouple wiring uses high-reliability D-subminiature-style connectors. All network interface signals use standard 9-pin D-subminiature-style connectors. Input power uses a circular military-style connector.

Key Features

Network-based 48-channel thermocouple encoding unit
Includes Fast Ethernet 100BASE-T port for:
- acquisition setup and configuration
- SNMP status and control
- acquisition data transport
- time synchronization using IEEE 1588 time
Uses three (3) internal card assembly types:
- PPC-2048 overhead card: Controls internal channel sampling and interfaces with the network
- TCD-4048 16-channel thermocouple conditioning card (3 each are included): Provides thermocouple conditioning, electronic cold junction compensation, and real-time thermocouple linearization
- PSU-2048 power supply: Accepts 28VDC aircraft power and provides multiple internal regulated outputs; provides ground isolation between 28V input, chassis and signal grounds.
True real-time thermocouple linearization
Compatible with types J, K, T, E, C and S (N Dash 2)
- Programmable on a per-channel basis
- Mixed types in the same unit
Programmable measurement range
- User selects zero-scale and full-scale temperatures. Range is “zoomed” accordingly. Up to 4x “zoom” (>1/4 of full TC range)
Programmable open TC detection for nongrounded thermocouples
±0.3% system accuracy
+28VDC operation, ±35VDC overvoltage protection