LU-S14000 Series I/O Modules
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LU-S14018 Eight-Channel Thermocouple Input Module
The LU-S14018 is a 16-bit A/D eight-channel thermocouple input module that acquires J, K, T, E, R, S and B thermocouples with cold junction compensation, as well as voltage and current signals. All channels feature programmable input ranges for cost-effective industrial measurement and monitoring, and 3000V isolation between analog input channels and the module protects against high-voltage surges.
Overview
LU-S14018 is a 16-bit A/D eight-channel thermocouple input module that can acquire J, K, T, E, R, S and B type thermocouples with cold junction compensation, as well as voltage and current signals. All channels provide a programmable input range function, offering excellent cost performance for industrial measurement and monitoring applications; moreover, a voltage isolation of 3000V is provided between its analog input channels and the module, effectively preventing the module from being damaged by high-voltage surges. It supports the Modbus protocol and uses the RS-485 bus for communication transmission, with a built-in optocoupler providing 3000V isolation voltage. It features surge protection, spike absorption and lightning protection.
Main features
Superior immunity to interference (EMC)
•High ESD immunity Test results: air discharge ±12KV; contact discharge ±6KV
•Easily passes 3KV fast transient burst interference (EFT test)
•Lightning surge impact protection ±2KV
•Radiated noise immunity test An analog noise interference source is provided through a winding (Impulse voltage: 1KV, Impulse width: 1us); no abnormality after 10 min of application
•Voltage dips, short interruptions and voltage variation immunity test Power supply ramp ±20%Ut, time ramp 2s±20% Voltage dip and temporary interruption 40%Ut, duration 5s
Analog input
•Effective resolution: 16 bits
•Channels: eight, fully differential
•Input types: thermocouple, mV, V, mA
•Input ranges: ±15mV, ±50mV, ±100mV, ±500mV, ±1V, ±2.5V, ±20mA
•Thermocouple types: J K T E R S B
•Cold junction compensation: yes (shared by eight channels; compensation can be enabled per channel by the user)
•Isolation voltage: 3000Vdc
•Input surge protection: yes
•Fault and overvoltage protection: withstands ±5V
•Sampling rate: 10 samples/s
•Input impedance: 20MΩ
•Bandwidth: 13.1Hz @ 50 Hz, 15.72Hz @ 60Hz
•Accuracy: ±0.05% or better
•Zero drift: ±3μV/°C
•Full-scale drift: ±25ppm/°C
•CMR @ 50 / 60Hz: min 92dB
Communication
•Mode: RS-485
•Protocol: Modbus
•Isolation voltage: 3000Vdc
•Surge protection, lightning protection: yes
Built-in watchdog timer
Power supply
•Power requirement: +10~+30Vdc (unregulated)
•Power consumption: 1.7W
LU-S14018 Eight-Channel Thermocouple Input Module Selection Guide
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