Description
Honeywell 620-0027
Technical Specifications
- Channel Quantity: 8 thermocouple input channels
- Supported Sensor Types: J, K, T, E, R, S, B thermocouple
- Input Signal Range: Thermocouple millivolt range matched to sensor type
- Resolution: 16-bit ADC
- Measurement Accuracy: ±0.2 % full scale including cold junction error
- Cold Junction Compensation: Onboard precision temperature sensor
- Channel Isolation: 500 VAC group reinforced isolation
- Backplane Interface: IPC620 I/O Link backplane bus
- Operating Temperature: 0 °C to +60 °C
- Power Consumption: 5.2 W maximum
- Hot Swap Support: Yes
Functional Features Onboard cold junction compensation eliminates temperature error at terminal block. Per channel open wire detection identifies broken thermocouple cable. Software channel configuration selects thermocouple type individually for each input. Low pass digital filter suppresses industrial noise on thermoelectric millivolt signal. Front panel LED shows module power, communication and group fault state. Temperature value converts directly into Celsius or Fahrenheit engineering unit. All measurement frames carry CRC checksum for data integrity verification.
Application Scenarios Furnace and oven high temperature monitoring with K and S type thermocouple Refrigeration process low temperature measurement with T type thermocouple Heat treatment batch temperature recording Boiler flue gas temperature measurement IPC620 PLC multi-point thermocouple temperature acquisition spare replacement
Performance Parameters
- ADC update rate: 8 Hz per channel
- Cold junction compensation accuracy: ±0.3 °C
- Isolation withstand voltage: 500 VAC for 60 seconds
- Common mode rejection ratio: 90 dB minimum
- Open wire detection response: Less than 250 ms
Material Composition Multilayer FR4 PCB, 16-bit ADC chip, precision cold junction temperature IC, instrumentation amplifier, optocoupler isolators, low drift metal film resistors, TVS surge diodes, gold plated backplane edge connector, flame retardant plastic front panel.
Structural Features Standard plug-in eurocard form factor matching IPC620 rack slot. Rear gold edge connector mates with IPC620 backplane bus. Internal isolation barrier separates thermocouple millivolt input zone and logic zone. Front panel LED array shows module health and communication status. Anti-keying notch prevents reversed insertion. Thermocouple input traces use guarded shield layout to reduce thermal induced offset.
Working Principle Thermocouple generates millivolt signal proportional to temperature difference between hot junction and cold terminal junction. Onboard cold junction sensor measures terminal block ambient temperature. Measurement circuit combines millivolt reading and cold junction value to calculate absolute temperature. ADC converts conditioned analog signal into digital value. FPGA applies sensor characteristic curve and filtering algorithm. Final temperature value and open wire fault flag are packed into I/O Link frame and transmitted to CPU.
Installation Requirements Use correct thermocouple extension wire matching sensor alloy type. Keep extension wire away from high current AC cable to avoid induced noise. Do not mix different thermocouple wire types on same channel. Configure sensor type and temperature unit in IPC programming software. Avoid direct airflow blowing on module terminal block to stabilize cold junction reading.
Usage Notes Thermocouple extension wire polarity reversal produces negative temperature reading error. Broken thermocouple wire triggers upscale or downscale fault alarm according configuration. Do not apply external voltage directly to thermocouple input terminals. Module terminal block must maintain stable ambient temperature for accurate compensation.
