1. General Introduction
The AI843 Thermocouple/mV Input Module provides 8 differential input channels for Thermocouple/mV measurements. Measurement ranges configurable per channel are: -30 mV to +75 mV linear, or TC Types B, C, E, J, K, L, N, R, S, T and U. A separate Pt100 channel is used for “Cold Junction” (ambient) temperature measurements, thus serving as CJ-channel for Ch. 1...8.
The junction temperature may be measured locally on the MTUs screw terminals, or on a connection unit distant form the device. Alternatively, a fix junction temperature for the module may be set by the user (as parameter) or a junction temperature set by the application.
2. Specification of AI843
Input Type | Temperature Range |
TC type B (1) | 44...1820°C, 111.2...3308°F |
TC type C | 0...2300°C, 32...4172°F |
TC type D | 0...2300°C, 32...4172°F |
TC type E(1) | -270...1000°C, -454...1832°F |
TC type J (1) | -210...1200°C, -346...2192°F |
TC type K(1) | -270...1372°C, -454...2501.6°F |
TC type L | -200...900°C, -328...1652°F |
TC type N(1) | -270...1300°C, -454...2372°F |
TC type R(1) | -50...1768°C, -58...3214.4°F |
TC type S(1) | -50...1768°C, -58...3214.4°F |
TC type T(1) | -270...400°C, -454...752°F |
TC type U | -270...400°C, -454...752°F |
Linear range | -30...75 mV |
Pt100 RTD (for CJC) (2) | -40...100°C, -40...212°F |
General info | |
Type | Analog Input |
Signal specification | -30..75 mV linear; TC types B, C, D, E, J, K, L, N, R, S, T and U |
Article number | 3BSE028925R1 |
Number of channels | 8 |
Signal type | See table |
HART | No |
SOE | No |
Redundancy | Yes |
High Integrity | No |
Intrinsic safety | No |
Mechanics | S800 |
Detailed data | |
Resolution | 16 bits |
Input impedance | > 1 MΩ |
Isolation | GroupWise isolated from ground |
Error | Max. 0.1% |
Temperature drift | Typ. 10 ppm/°C, Max. 25 ppm/°C |
Update cycle time | 320 + 80 * (no of active channels) ms at 50 Hz 267 + 67 * (no of active channels) at 60 Hz |
Input filter (rise time 0-90%) | 1.1 kHz |
Maximum field cable length | 600 meters (656 yards) |
CMRR, 50Hz, 60Hz | 100 dB |
NMRR, 50Hz, 60Hz | >40 dB |
Rated insulation voltage | 50 V |
Dielectric test voltage | 500 V a.c. |
Power dissipation | 1.5 W |
Current consumption +5 V Module bus | 60 mA |
Current consumption +24 V Module bus | 50 mA |
Current consumption +24 V external | 0 |
Diagnostics | |
Front LED’s | F(ault), R(un), W(arning) |
Supervision | Module error: reference channels outside limits, power supply low Channel error: open-circuit, CJ channel error (ch 8): out of range <-40°C (-40°F) and >100°C (212°F) Junction channel) Channel error Linear: none |
Status indication of supervision | Module Error, Module Warning, Channel error |
Environmental and certification | |
CE mark | Yes |
Electrical safety | IEC 61131-2, UL 508 |
Hazardous location | C1 Div 2 cULus, C1 Zone 2 cULus, ATEX Zone 2 |
Marine certification | - |
Protection rating | IP20 according to IEC 60529 |
Corrosive atmosphere ISA-S71.04 | G3 |
Climatic operating conditions | 0 to +55 °C (Storage -25 to +70 °C), RH=5 to 95 % no condensation, IEC/EN61131-2 |
Pollution degree | Degree 2, IEC 60664-1 |
Mechanical operating conditions | IEC/EN 61131-2 |
EMC | EN 61000-6-4 and EN 61000-6-2 |
Overvoltage categories | IEC/EN 60664-1, EN 50178 |
Equipment class | Class I according to IEC 61140; (earth protected) |
Max ambient temperature | 55 °C (131 °F), for vertical mounting 40 °C (104 °F) |
RoHS compliance | DIRECTIVE/2011/65/EU (EN 50581:2012) |
WEEE compliance | DIRECTIVE/2012/19/EU |
Comp ability | |
Use with MTU | TU818, TU830, TU833, TU842, TU843 |
Keying code | BA |
Dimensions | |
Width | 45 mm (1.77”) |
Depth | 102 mm (4.01”), 111 mm (4.37”) including connector |
Height | 119 mm (4.7”) |
Weight | 0.157 kg (0.35 lbs.) |
3. Selection table of I/O Modules
Name | HART | High Integrity | Intrinsic safety | Mechanics | Redundancy | SOE | Type |
AI801 | No | No | No | S800L | No | No | Analog Input |
AI810 | No | No | No | S800 | No | No | Analog Input |
AI815 | Yes | No | No | S800 | No | No | Analog Input |
AI820 | No | No | No | S800 | No | No | Analog Input |
AI825 | No | No | No | S800 | No | No | Analog Input |
AI830A | No | No | No | S800 | No | No | Analog Input |
AI835A | No | No | No | S800 | No | No | Analog Input |
AI843 | No | No | No | S800 | Yes | No | Analog Input |
AI845 | Yes | No | No | S800 | Yes | No | Analog Input |
AI880A | Yes | Yes | No | S800 | Yes | No | Analog Input |
AI890 | No | No | Yes | S800 | No | No | Analog Input |
AI893 | No | No | Yes | S800 | No | No | Analog Input |
AI895 | Yes | No | Yes | S800 | No | No | Analog Input |
AO801 | No | No | No | S800L | No | No | Analog Output |
AO810V2 | No | No | No | S800 | No | No | Analog Output |
AO815 | Yes | No | No | S800 | No | No | Analog Output |
AO820 | No | No | No | S800 | No | No | Analog Output |
AO845A | Yes | No | No | S800 | Yes | No | Analog Output |
AO890 | No | No | Yes | S800 | No | No | Analog Output |
AO895 | Yes | No | Yes | S800 | No | No | Analog Output |
