AI2 Two Channel Isolated Analog Input Module Technical Data Sheet

This two channel isolated analog input module (AI2), is used for standard V and mA process inputs. Channel based isolated loop power supplies are provided to support 2-wire connection to field transmitters. It is commonly used for reading industrial process variables, for example, temperature or pressure.

Main AI2 Characteristics
Number of channels	2
Compatible terminal block	D12
Analog input type	Current ±20 mA Voltage ±10 V
Input wiring mode	2, 3 or 4 wires
Analogue input resolution	Voltage Resolution 6uV pk=pk Current Resolution 0.03uA pk-pk
Permitted overload on inputs	30 V maximum voltage 30 V at 50 mA maximum current
Input impedance	Current 250 Ω + 10 Ω (typical) internal current protector Voltage >10 MΩ
Sampling duration	100 ms
Sensor power supply protection	Over current protection per channel Short circuit protection on loop power supply per channel
Input diagnostic channel	Module field power fault detected Module hardware fault detected Loop power supply fault detected ADC Range Underflow detected ADC Range Overflow detected Hardware fault detected Calibration Invalid
Hart tolerance	Yes
Temperature drift	±0.001 % FS / °C (±0.0018 % FS / °F)
Measurement error	<= 0.05 % FS 25 °C (<= 0.05 % FS 77 °F) <= 0.1 % FS -20 to 55 °C (<= 0.1 % FS -68 to 131 °F)
Non-linearity	<= 0.01 % FS
Common mode rejection	90 dB
Sensor power supply Output	19.2 to 30 Vdc sensor power supply 24 Vdc isolated loop power
Typical current consumption	36 mA at 24 Vdc on the bus current 38.4 mA at 24 Vdc on the internal field current minimum 246.1 mA at 24 Vdc on the internal field current maximum
Power dissipation	1.3 W maximum at 24 Vdc
Isolation	Between channels 530 Vac Between channels and bus 1500 Vac Between channels and ground 1500 Vac Between channels and field power No for sensor power supply 1000 Vac for loop power supply Between field power and bus 1500 Vac
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' 2')
Weight	Module 47.6 g (1.68 oz) Terminal Block 47.7 g (1.68 oz)
Hot swap	Yes
Housing color	Grey

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

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")

A12 Two Channel Isolated Analog Input Terminal Wiring

NOTICE
INOPERABLE EQUIPMENT Do not connect the 24 Vdc sensor power supply with the 24 Vdc loop power supply of the module Failure to follow these instructions can result in equipment damage

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

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)

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").

Key	Description
1	The sensor power outputs, pins 1, 3, 5 and 7, are protected within the module by a common self-resetting eFuse (nominally 500 mA). The module has two power supply diagnostics flags, one for the field power incoming from the backplate, and one for the outgoing power to the sensor.
2	24 V is isolated loop power
3	24 V_1 and 24 V_2 is Sensor power
4	For 3-wire sensors, note the connections required between pins 4 and 11, and 8 and 12

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

You may damage the analog circuit if you do not verify that the physical wiring of the analog circuit is compatible with the software configuration for the analog channel.