Model Interpretation

3706ETMR: Enhanced version, 32-channel isolated differential thermocouple input, integrated CJC cold junction compensation, full TMR triple redundant structure

Compatibility: Tricon V9~V12 8110/8111/8112/8115/8116 rack, fully hot-swappable

Difference vs standard 3706: E=enhanced high precision circuit, optimized low-mV anti-noise, wider ambient working range, upgraded self-diagnosis algorithm

Technical Parameters

Electrical Specification

Input Channel:32 differential isolated thermocouple channels

Supported TC Types: J,K,T,E,R,S,B,N via TriStation software configuration

Input Signal Range: -100~+100mV thermocouple raw signal

Built-in CJC: Onboard cold junction compensation for all channels automatically

Resolution:16-bit high precision ADC

Basic Accuracy:≤±0.1%FS after CJC correction at 0~60℃

Channel Isolation:1500VAC field-to-backplane galvanic isolation, inter-channel isolation

Full Module Scan Rate:120ms for total 32 channels

Input Impedance＞100MΩ per channel

Overvoltage withstand:120VDC continuous surge protection

Backplane power consumption ≤8.2W @24VDC

Safety & Redundancy

Architecture:2oo3 TMR triple modular redundant median voting

Certification:IEC61508 SIL3, TÜV, UL, CE, FM approved

Diagnostics:Per-channel open-circuit/short-circuit/TC break detection + TMR deviation monitoring, fault coverage＞99.9%

SOE timestamp ≤35ms

MTBF≥152000 hours

Mechanical & Environment

Form Factor:Single slot 3U standard Tricon rack module

Dimension(W×H×D):115×31×186mm

Net Weight≈1.22kg

Front Panel LED:PASS, FAULT, ACTIVE status indicator

Operating Temp:-40℃~+70℃; Storage:-55℃~+85℃

Humidity:5%~95%RH non-condensing

Core Functions

Multi-type thermocouple weak mV signal precise collection with automatic cold junction compensation without external CJC box

Full independent channel isolation to avoid ground loop drift damage on tiny thermocouple signals

TMR redundant fault tolerant acquisition to meet SIL3 safety requirement for temperature ESD interlock

Online hot-plug replacement without SIS system halt, channel-level fault pinpoint

Parameter setup, temperature linearization and real-time data view via TriStation1131 engineering software

Applications

Petrochemical & Refinery:Reactor, cracking furnace, heat exchanger critical temperature safety interlock monitoring

Thermal Power Plant:Boiler furnace, superheater, turbine casing temperature SIS protection

Oil & Gas Onshore/Offshore:Heater, separator high-temperature safety shutdown monitoring

Chemical Plant:Reaction vessel temperature HIPPS safety interlock acquisition

Brief Comparison

3706ETMR(32Ch Isolate TC,K/J/T/E/R/S/N,built-in CJC)|3720TMR(64Ch 4-20mA/0-5V general AI)|3703E(4Ch ±10V high-speed precision voltage AI)

Special TC temperature input card|Universal high-density analog input|Fast dynamic voltage acquisition card