Description
Honeywell TC-I1AH16I
Technical Specifications
- Channel count: 16 analog input channels
- Signal type: 4–20 mA DC current
- Explosion-proof rating: Intrinsic safety Ex ia ⅡC T4
- Channel isolation: 2500 VAC electrical isolation
- Output energy limit: Loop short circuit spark energy far below gas ignition threshold
- Resolution: 16-bit ADC
- Operating temperature: 0 °C to +60 °C
- Loop supply: 24 V DC, 20 mA per channel
Functional Features Intrinsic safety zener barrier limiting circuit, strictly restricts field-side energy within safe levels. Per-channel open circuit and short circuit automatic diagnosis, triggers channel fault alarm. Digital filter smooths acquisition signals, suppresses field interference. On-board LEDs indicate card power, fault and communication status. 16-bit high-precision ADC, measurement accuracy ±0.1% full scale. All acquired data frames carry CRC checksum for upload to controller.
Application Scenarios Transmitter signal acquisition adjacent to explosion zones in chemical plants Process variable measurement in hazardous areas at oil and gas stations Discrete signal input for pharmaceutical workshop flammable environments Analog acquisition loop assembly for explosion-required C200 systems
Performance Parameters
- Conversion accuracy: ±0.1% full scale
- Loop short circuit energy: ≤0.05 mJ, far below ⅡC class gas ignition energy
- Wire break detection response: ≤200 ms
- Common mode rejection ratio: ≥90 dB
- Explosion-proof certification: Certified by National Explosion-proof Electrical Product Quality Inspection Center
Material Composition FR4 flame retardant PCB substrate Intrinsic safety zener barrier components 16-bit ADC chip Channel isolation optocouplers Precision current limiting resistors Gold-plated backplane edge fingers UL94 V0 flame retardant plastic front panel
Structural Features Standard Eurocard dimensions, inserts into C200 I/O rack slots. Strengthened isolation barrier separates field hazardous side and system side. Front terminals silk-screened with intrinsic safety area warning labels. Front panel LEDs display card run status. Zener barrier components are compact, occupying small board area.
Working Principle Field transmitter signals connect to input terminals; the intrinsic safety zener barrier limiting circuit strictly restricts loop voltage and current to safe values. The 4–20 mA current signal passes through sampling and ADC to digital values; isolation circuits provide complete electrical separation between field hazardous side and system side. On-board logic monitors loop impedance, identifying sensor open circuit and short circuit faults. Converted engineering values are packaged and uploaded to the controller via the backplane. When a field loop short circuit occurs, the limiting circuit quickly restricts loop energy, ensuring short-circuit spark energy is too low to ignite surrounding hazardous gas.
Installation Requirements Route intrinsic safety side and non-intrinsic safety side cables in separate trays, maintain ≥50 mm separation. Use intrinsic safety shielded cable for field side wiring, shield grounded reliably. Keep intrinsic safety side loop ground completely independent from cabinet protective ground. Calibrate measurement zero and span per channel after power-up.
Usage Notes Never replace on-board zener barrier components with non-original parts; mismatched parameters destroy intrinsic safety performance. Mixing intrinsic safety side cables with high-power cabling introduces interference and breaks explosion isolation performance. Never connect external supply exceeding rated range to the field side loop. Intrinsic safety cards do not support on-site component-level repair; replace the entire unit on failure.
