AI835A
Thermocouple / mV Input · 8 Channels · 3BSE051306R1
Lifecycle note: Preserve the thermocouple extension wiring and cold-junction configuration. Validate the temperature reading with the correct sensor simulation before returning the channel to service.
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+86-18020776786Thermocouple / mV Input Module · S800 I/O
ABB AI835A, article number 3BSE051306R1, is an S800 I/O module with eight differential channels for thermocouple or low-level millivolt measurement. It supports a linear input range of −30 to +75 mV and thermocouple types B, C, D, E, J, K, L, N, R, S, T and U. The signal selection is configurable per channel. Channel 8 can instead measure a four-wire Pt100 cold-junction reference for channels 1–7, so the required number of process thermocouples and the chosen compensation method must be considered together.
The module provides 15-bit conversion, input impedance above 1 MΩ and a published maximum error of 0.1%. Conversion update time depends on the active-channel count and the 50 Hz or 60 Hz setting rather than being a fixed per-module value. ABB specifies common-mode rejection of 120 dB and normal-mode rejection above 60 dB at those mains frequencies. Inputs are isolated as a group from ground and are supervised for open circuits. Match the thermocouple type, extension-wire materials, compensation location and signal-return arrangement to the project configuration.
For maintenance and supplier acceptance, record the 3BSE051306R1 article identity, channel sensor types, active-channel count and cold-junction configuration before removing the module. Preserve the terminal-unit selection and BA mechanical keying arrangement, and inspect the original connector and label condition. A bench test should distinguish linear millivolt conversion from a compensated thermocouple test, since the latter depends on the junction-temperature reference. Installation and recommissioning should follow the applicable S800 documentation, with cabinet temperature, wiring integrity and each affected temperature indication checked before returning loops to service.
| Manufacturer / model / article | ABB / AI835A / 3BSE051306R1 |
|---|---|
| Input channels / signal | 8 differential inputs; −30 to +75 mV linear |
| Thermocouple types | B, C, D, E, J, K, L, N, R, S, T and U |
| Cold-junction measurement | Channel 8 selectable as CJ input using 4-wire Pt100; serves channels 1–7 |
| A/D resolution / impedance | 15 bits; input impedance >1 MΩ |
| Error / temperature drift | Maximum error 0.1%; drift typical 5 ppm/°C, maximum 7 ppm/°C |
| Update cycle at 50 Hz | 280 + 80 × number of active channels, in ms |
| Update cycle at 60 Hz | 250 + 70 × number of active channels, in ms |
| Noise rejection | CMRR 120 dB; NMRR >60 dB at 50/60 Hz |
| Maximum field cable length | 600 m |
| Isolation / dielectric test | Groupwise isolation from ground; 50 V rated insulation; 500 V AC dielectric test |
| ModuleBus power / dissipation | +5 V: 75 mA; +24 V: 50 mA; external +24 V: 0; dissipation 1.6 W |
| Ambient / enclosure | 0 to +55 °C; approvals +5 to +55 °C; vertical compact-MTU mounting maximum 40 °C; IP20 |
| Dimensions / weight | 45 × 119 × 102 mm (W × H × D); depth 111 mm including connector; 0.22 kg |
Preserve thermocouple types, cold-junction reference, active-channel count and terminal-unit configuration before replacement.
No. Channel 8 then serves as the cold-junction measurement for channels 1–7, leaving seven thermocouple process channels. When cold-junction measurement is not required on that channel, ABB permits channel 8 to be used like the other inputs. Account for that choice in the I/O schedule.
ABB identifies D, L and U as additional thermocouple types supported by AI835A compared with AI835. A similar base model does not establish the same configured sensor coverage. Retain AI835A and article 3BSE051306R1 in the spare specification when those sensor types are used.
Using ABB’s formulas, eight active channels give 280 + 80 × 8 = 920 ms at 50 Hz, or 250 + 70 × 8 = 810 ms at 60 Hz. These are module update-cycle calculations, not complete control-loop response times. Recalculate if the active-channel count changes.
The compensation temperature must represent the actual thermocouple-to-copper junction location. ABB supports cold-junction measurement locally at the MTU or at a distant connection unit. Match the configured reference and sensor location to the physical junction rather than assuming that cabinet and remote-box temperatures are equal.
Linear mV conversion and thermocouple interpretation are different configurations. A thermocouple test also depends on the selected sensor type and cold-junction reference. Record the calibrator mode, simulated sensor type and compensation arrangement so that two test setups do not apply incompatible or duplicate compensation.
No. It is a published maximum cable length, not a guarantee for arbitrary wiring or installation noise. Select the correct thermocouple extension or compensating conductors and follow the applicable grounding and shielding instructions. Include the installed cable route and signal quality in commissioning checks.
When channel 8 supplies the common cold-junction reference, channels 1–7 depend on that reference. ABB supervises the CJ channel below −40 °C and above +100 °C. Check its Pt100 circuit and junction-temperature plausibility before treating every affected thermocouple as a separate sensor failure.
ABB specifies 120 dB common-mode rejection and more than 60 dB normal-mode rejection at 50/60 Hz. They describe different interference modes and should not be added into one rejection figure. Determine whether noise appears between signal and ground or between the differential inputs, while keeping within the rated insulation and wiring limits.
Send the model, complete part number, quantity, destination and nameplate photo. We will verify identification details before confirming availability and lead time.
Official PDF: ABB S800 I/O Official Outline — AI835A. File size is below 1 MB; verify the exact installed hardware and configuration before use.
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