1. General Introduction
The AI820 Analog Input Module has 4 differential, bipolar current/voltage inputs. Each channel can be either a voltage or current input. The current inputs can withstand an accidental maximum normal mode 30 V d.c. connection. To protect the current input circuit against dangerous input levels, that is, by accidentally connecting a 24 V source, the resistor rating of the 250W current sense resistors is about 5 Watts. This is intended only to temporarily protect one channel at a time.
The module distributes the external transmitter supply to each channel. This adds a simple connection (with extended MTUs) to distribute the supply to external 2 wire transmitters. There is no current limiting on the transmitter power terminals.
All 4 channels are isolated from the Module Bus in one group. Power to the input stages is converted from the 24 V on the Module Bus.
2. Specification of AI820
General info | |
Type | Analog Input |
Signal specification | -20..+20 mA, 0(4)..20 mA, -10..+10 V, 0(2)..10 V |
Article number | 3BSE008544R1 |
Number of channels | 4 |
Signal type | Bipolar differential |
HART | No |
SOE | No |
Redundancy | No |
High Integrity | No |
Intrinsic safety | No |
Mechanics | S800 |
Detailed data | |
Resolution | 14 bit plus sign |
Input impedance | 200 kΩ ± 25% (voltage mode, common mode) |
Isolation | GroupWise isolated from ground |
Under/over range | 0/ +15% |
Error | Max 0,1% |
Temperature drift | Voltage: Max. 70 ppm/°C Current: Max. 50 ppm/°C |
Input filter (rise time 0-90%) | 40 ms |
Current limiting | Transmitter power can be current limited by the MTU |
Maximum field cable length | 600 meters (656 yards) |
Rated insulation voltage | 50 V |
Dielectric test voltage | 500 V a.c. |
Power dissipation | 1.7W |
Current consumption +5 V Module bus | 80 mA |
Current consumption +24 V Module bus | 0 |
Current consumption +24 V external | 70mA |
Diagnostics | |
Front LED’s | F(ault), R(un), W(arning) |
Supervision | Internal Power Supply |
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 | Internal Power Supply |
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 | TU810, TU812, TU814, TU830, TU833 |
Keying code | BB |
Dimensions | |
Width | 45 mm (1.77”) |
Depth | 102 mm (4.01”), 111 mm (4.37”) including connector |
Height | 119 mm (4.7”) |
Weight | 0.2 kg (0.44 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 |
