AI835A | ABB Analog Input Module

ABB AI835A S800 Thermocouple/mV Input Module: 8-Channel Precision

Detailed Technical Specifications

• Brand: ABB
• Model: AI835A (Article 3BSE051306R1)
• Type: Thermocouple/mV Input Module for S800
• Number of Channels: 8 differential inputs
• Measurement Ranges: -30 to +75 mV linear; All major thermocouple types
• Resolution: 15 bits
• Input Impedance: > 1 MΩ
• Measurement Error: Maximum 0.1% of range
• Temperature Drift: Typically 5 ppm/°C, Maximum 7 ppm/°C
• Update Cycle Time (50 Hz): 280 + 80 × (active channels) ms
• Update Cycle Time (60 Hz): 250 + 70 × (active channels) ms
• Normal Mode Rejection Ratio (NMRR): >60 dB at 50/60 Hz
• Common Mode Rejection Ratio (CMRR): 120 dB at 50/60 Hz
• Maximum Field Cable Length: 600 meters
• Power Dissipation: 1.6 Watts
• Rated Insulation Voltage: 50 V
• Dielectric Test Voltage: 500 V AC

Cold Junction Compensation Features

• Channel 8 can function as a dedicated cold junction compensation channel
• Compensation uses a 4-wire Pt100 RTD for high accuracy
• Measure junction temperature locally at MTU terminals or remotely
• Users can set a fixed junction temperature as a parameter value
• The AI835A allows junction temperature setting from the application
• Channel 8 operates as a normal input when not used for compensation
• Diagnostics monitor CJ-channel for temperatures outside -40°C to +100°C

Environmental Ratings and Compliance

• Operating Temperature: 0 to +55 °C (approved range +5 to +55 °C)
• Storage Temperature: -40 to +70 °C
• Relative Humidity: 5 to 95%, non-condensing
• Pollution Degree: 2
• Protection Class: IP20
• Corrosion Protection: ISA-S71.04 G3
• Safety Standards: EN/UL 61010-1, EN/UL 61010-2-201
• Hazardous Location Approvals: Class I Div 2, ATEX Zone 2
• Marine Certifications: ABS, BV, DNV, LR
• EMC Standards: EN 61000-6-2, EN 61000-6-4
• RoHS Compliance: Yes (Directive 2011/65/EU)

Frequently Asked Questions (FAQ)

• Q: What is the difference between AI835 and AI835A modules?
  A: The ABB AI835A supports additional thermocouple types D, L, and U, while the AI835 supports types B, C, E, J, K, N, R, S, T.
• Q: How many temperature input channels does this module have?
  A: Both AI835/AI835A provide 8 differential input channels for thermocouple or mV signals.
• Q: What is cold junction compensation and how does it work?
  A: Channel 8 can use a 4-wire Pt100 RTD to measure ambient temperature for accurate thermocouple cold junction compensation.
• Q: What thermocouple types does the AI835A support?
  A: The AI835A supports types B, C, D, E, J, K, L, N, R, S, T, and U thermocouples.
• Q: Does the module detect sensor connection problems?
  A: Yes, the module monitors all inputs for wire-break open-circuit conditions and provides diagnostics.
• Q: What is the measurement resolution of these modules?
  A: Both modules provide 15-bit resolution for high-precision temperature measurements.
• Q: Can I use channel 8 as a regular input channel?
  A: Yes, channel 8 functions as a normal thermocouple/mV input when not configured for cold junction compensation.
• Q: What MTU units are compatible with these modules?
  A: They work with ABB MTUs including TU810, TU812, TU814, TU818, TU830, and TU833 with keying code BA.
• Q: What is your shipping policy for temperature modules?
  A: We ship worldwide within 5 days via major carriers and offer a 30-day return policy.