AI3 Three Channel Isolated Universal Analog Input Module Technical Data Sheet

This three channel isolated analog input module (AI3) is a high precision universal analog input module, it accepts most standard industrial process inputs: mV, V, mA, thermocouple, resistance and resistance temperature detector (RTD). mA inputs require an external shunt resistor and an optional shunt assembly is available to assist with installation. The AI3 module is commonly used for reading industrial process variables, for example, thermocouple temperatures, pressures, and flowrates.

This three channel analog input module (AI3) is a high precision universal analog input module, it accepts most standard industrial process inputs:

Main Characteristics  
Number of channels
3
Compatible terminal block
C12
Input range
Voltage ±40 mV, ±80 mV, ±1 V, 0 to 2 V, ±20 V
Current ±20 mA
Resistance 0 to 400 Ω / 0 to 4kΩ
Contact Closure Active < 3.2 kΩ, Inactive > 3.5 kΩ (2-Wire RTD connection)
Input impedance
40 mV, 80 mV > 10 MΩ (typical)
1 V, 0 to 2 V > 100 MΩ (typical)
Maximum input range Input range ±5%
Input wiring mode
2 or 3 wires

Accuracy (ambient 25°C (77 °F) / (Full Operational 0 to 55°C (32°F - 131 °F))

(%FS) (FS= Zero to Full span)
±40 mV 0.06 % / 0.11 %
±80 mV 0.05 % / 0.1 %
±1 V 0.05 % / 0.1 %
0 to 2 V 0.05 % / 0.1 %
±20 V 0.09 % / 0.2 %
±20 mA (Assuming external shunt 0.05% tolerance and 10 ppm/°C (5.6 ppm/°F ) drift ) 0.11 % / 0.2 %
0 to 400 Ω / 0 to 4kΩ 0.05 % / 0.1%
Internal cold junction compensation measurement(CJC) 0.5 °C / 0.7 °C (0.9 °F/1.3 °F)

CJ rejection ratio (AI3 only)
150:1
Offset and gain drift error
±40 mV, ±80 mV, ±1 V, 0 to 2 V 0.16 μV/°C + 12 ppm/°C (0.09 μV/°F + 6.7 ppm/°F)
±20 V 29 μV/°C + 32 ppm/°C (16.1 μV/°F + 17.8 ppm/°F)
±20 mA (External 0.05% 10ppm Shunt) 0.003 μA/°C + 22 ppm/°C (0.002 μV/°F + 9.9 ppm/°F)
0 to 400 Ω / 0 to 4kΩ 0.001 Ω/°C + 7 ppm/°C (0.001 Ω/°F + 3.9 ppm/°F)

Thermocouple long term drift

Types T, R, B, E, J, K, N, S, C and M
Over a 90 day interval, suitable for Class 1 furnace AMS2750 Applications:
< 1.1°C (33.98°F) for "Control, monitoring and recording Instruments"
< 0.6°C (33.08°F) for "Field Test Instruments"
Resolution (peak to peak - no software filter)
Voltage 0.45 μV on ±40 mV
  0.65 μV on ±80 mV
  3.3 μV on ±1 V
  3.3 μV on 0 to 2 V
  70 μV on ±20 V
Current 0.1 μA on ±20 mA
Resistance 0.004 Ω on 400 Ω
Resistance 0.014 Ω on 4 kΩ
Protection Overvoltage protection maximum ±30 Vdc no damage
Input diagnostic
Broken wire on mV / 1 V / TC / Resistance / RTD / input types
AC sensor break, Low > 5 kΩ, High > 20 kΩ , 0 to 2 V offline impedance measurement
RTD lead resistance >22 Ω
Hart tolerance
Yes
Cold junction compensation measurement(CJC)
Temperature sensor on board and terminal block
Differential mode Rejection
> 80 dB (50/60 Hz)
Common mode Rejection
> 150 dB (50/60 Hz)
Non-linearity (Relative to Full scale)
±40 mV, ±80 mV, ±1 V; 0 to ±2 V, ±20 V < 0.0008 %
0 to 400 Ω / 0 to 4kΩ < 0.004 %
Input filter
Software run-time configurable filter 0 (Off) to 1000 seconds - Default 1.6 s
Current consumption
36.0 mA at 24 Vdc on the bus current
18.0 mA at 24 Vdc on the internal field current minimum
21.6 mA at 24 Vdc on the internal field current maximum
Power dissipation
1.2 W maximum at 24 Vdc
Isolation
Between channels 1500 Vac Basic
Between channels and bus 3000 Vac Reinforced
Between channels and ground 3000 Vac Reinforced
Maximum cable length
Unshielded Maximum length 30 m (98' 5")
Shielded Current maximum length 1000 m (3280' 10")
Shielded Voltage maximum length 200 m (656' 22")
Weight
Module 44.4 g (1.57 oz)
Terminal Block 48.0 g (1.69 oz)
Hot swap
Yes
Housing color
Grey

Thermocouple

Thermocouple Data  
Temperature scale
ITS-90
Cold junction Compensation types
Automatic (Internal CJC measurement), Fixed (user entered value) , None, Remote (Software configured)
Upscale/downscale drive
User defined Value, Range High, Range Low
Thermocouple Types Range °C (°F) Standard Max Linearization error °C (°F)
B
0 to 1820 (32 to 3308)
IEC 584.1
0 to 400 (32 to 752) = 1.7 (3.06)
400 to 1820 (752 to 3308) = 0.03 (0.054)
C
0 to 2300 (32 to 4172)
Hoskins
0.12 (0.22)
D
0 to 2495 (32 to 4523)
Hoskins
0.08 (0.14)
E
-270 to 1000 (-454 to 1832)
IEC 584.1
0.03 (0.05)
G2
0 to 2315 (32 to 4199)
Hoskins
0.07 (0.13)
J
-210 to 1200 ( -346 to 2192)
IEC 584.1
0.02 (0.04)
K
-270 to 1372 (-454 to 2501.6)
IEC 584.1
0.04 (0.07)
L
-200 to 900 (-328 to 1652)
DIN43710:1985 (To IPTS68)
0.02 (0.04)
N
-270 to 1300 (-454 to 2372)
IEC 584.1
0.04 (0.07)
R
-50 to 1768 (-58 to 3214.4)
IEC 584.1
0.04 (0.07)
S
-50 to 1768 (-58 to 3214.4)
IEC 584.1
0.04 (0.07)
T
-270 to 400 (-454 to 752)
IEC 584.1
0.02 (0.04)
U
-200 to 600 (-328 to 1112)
DIN43710:1985
0.08 (0.14)
NiMo/NiCo
-50 to +1410 (-58 to 2570)
ASTM E1751-95
0.06 (0.11)
Ni/NiMo
0 to 1406 (32 to 2562.8)
Ipsen
0.14 (0.25)
Platinel
0 to 1370 (32 to 2498)
Engelhard
0.02 (0.04)
Pt20%Rh/ Pt40%Rh
0 to 1888 (32 to 3430.4)
ASTM E1751-95
0.07 (0.13)
MoRe
0 to 1990 (32 to 3614)
Eurotherm
0.016 (0.)
Resistance Inputs  
Temperature scale
ITS-90
Influence of lead resistance
Matched - Negligible
Mismatched - 1 Ω/Ω
Measurement source current
250 µA
Resistance Temperature Detector (RTD) Type Range °C (°F) Standard Maximum Linearization Error °C (°F)
Cu10
-20 to 250 (-4 to 482)
General Electric Co.
0.02 (0.036)
Cu53
-70 to 200 (-94 to 392)
RC21-4-1966
0.01 (0.018)
JPt100
-220 to 630 (-364 to 1166)
JIS C1604:1989
0.01 (0.018)
Ni100
-60 to 250 (-76 to 482)
DIN43760:1987
0.01 (0.018)
Ni120
-50 to 170 (-58 to 338)
DIN43760:1987
0.01 (0.018)
Pt100
-200 to 850 (-328 to 1562)
IEC 751
0.01 (0.018)
Pt100a
-200 to 600 (-328 to 1112)
Eurotherm Recorders SA
0.09 (0.162)
Pt1000
-200 to 600 (-328 to 1112)
IEC 751
0.01 (0.018)
Environment  
IP degree of protection
IP20
Product certification
CE
CULus
RCM
Standards
EN/IEC 61326-1
EN 61010-2-201
UL 61010-2-201
Directives
2014/30/EU - Electromagnetic compatibility
2014/35/EU - Low voltage
2011/65/EU, 2015/863/EU RoHS
Operating temperature
0 to 55 °C (32 to 131 °F)
Storage temperature
-5 to 60 °C (23 to 140 °F)
Relative humidity
5 % to 95 % without condensation
Operating altitude
0 to 2000 m (0 to 6561 ft)
Pollution degree
2
Vibration
2 g
Shock
15 g for 11 ms

Dimensions

Dimension Size
a 15 mm (0.59")
b 100 mm (3.94")
c 66 mm (2.60")
c plus Terminal Block 101.9 mm (3.98")

Shunt Assembly

Description Value
Resistance
49.9 Ω
Tolerance
±0.05 %
Thermal stability
<±10 ppm
Connector system
Blade 18 mm (0.7")long, 2.3 mm (0.09") wide and 0.8 mm (0.03") thick.
Bare conductor <1.4 mm (0.06")
Dimensions Size
a
17.6 mm (0.69")
b
7.3 mm (0.29")
c
11.6 mm (0.46")
d
3 mm (0.12")
Thickness
1.2 mm (0.05")
   
Tip - We recommend the use of blade terminals with the AI3 shunt board:

Blade Dimension Size
G
18 mm (0.7")
B
7.3 mm (0.29")
T
11.6 mm (0.46")

AI3 Universal Analog Input Terminal Wiring

DANGER

HAZARD OF ELECTRICAL SHOCK, EXPLOSION OR ARC FLASH

  • Do not exceed the device’s ratings.

  • Ensure all cables and wiring harness are secured using a relevant strain relief mechanism.

Failure to follow these instructions will result in death or serious injury

 

WARNING

UNINTENDED EQUIPMENT OPERATION

  • Ensure wires are routed to minimize the pick-up of Electromagnetic interference (EMI) keeping cable lengths to a minimum.

  • Only use copper cables (except for the thermocouple wiring).

Failure to follow these instructions can result in death, serious injury, or equipment damage
Tip - Where signal and power wiring cannot be separated, signal wiring should be shielded.
Terminal Wiring Cross Section
1 solid conductor 0.2 to 2.5 mm² (American Wire Gauge (AWG) 24 - AWG 14)
2 solid conductors 0.2 to 1.5 mm² (AWG 24 - AWG 16) - both conductors must be the same cross section
1 stranded conductor without ferrule 0.2 to 2.5 mm² (AWG 24 - AWG 14)
1 stranded conductor with single ferrule 0.2 to 1.5 mm² (AWG 24 - AWG 16)
2 stranded conductors with twin ferrule 0.2 to 0.75 mm² (AWG 24 - AWG 20)
Note - Minimum individual conductor size in stranded connectors when no ferrule is used is a cross section of 0.05 mm² (AWG 30).

Terminal block captive screws are not supplied tightened and must be tightened to 0.5 to 0.6 Nm (0.30 lb-ft) using a flat tipped screwdriver with a diameter of 3.5 mm (0.14"). Stripping length for all cable types is 10 mm (0.39").

Note - Shielded cable not required if the cable connected to the I/O terminals is under 30 m (98' 5") in length.
Key Description
1 - Shunt Resistor This is required for mA inputs. The parameter configuration defaults to 49.9 Ω to match the value of the EPM Shunt Assembly (available separately), if a different resistor is used, its value must be entered in the parameter configuration. Shunt resistors below 50 Ω use the ±1 V range and resistors above 50 Ω use the ±20 V range. For the best results, use a resistor with a value closest to 50 Ω for the most demanding applications. Ensure the terminals used match the value of resistor selected.
2 - Contact Closure This input type uses the 2-wire resistance input arrangement to detect the state of a volt free contact (VFC) as open/closed. This is provided for legacy use cases and the preferred connection method is to use a digital input module type because to provide a current through the contacts that is designed to work over a wide range of conditions. The resistance based approach used by the AI3 only provides a very small current and the switching of the VFC may not be reliably detected, for example, contacts becoming dirty over time.

NOTICE

INOPERABLE EQUIPMENT

Do not physically wire the analog channel for a voltage signal and configure the channel for a current signal.

Failure to follow these instructions can result in equipment damage
Note - You may damage the external shunt resistor if you do not verify that the physical wiring of the external shunt resistor.
See Ordering an EPM Solution and/or EPM Spares for details.