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Technical specifications for AI2 2500M/AI2/XXXXX/XXXXXX
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Manufacturer:Invensys
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Product Category:DCS Systems
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Spare Part Number:AI2 2500M/AI2/XXXXX/XXXXXX
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Estimated shipping dimensions:2.6x8.8x9cm
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Weight:0.8 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Analog input channels:2
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Supported signal classes:TC, RTD, mV, V, mA, resistance, potentiometer
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RTD connections:2-wire, 3-wire or 4-wire
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High-impedance input location:Channel 2
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Thermocouple millivolt span:-150 to +150 mV
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Current span with mA terminal unit:-25 to +25 mA
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mA terminal burden:5 Ω
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Cold-junction sensor:RTD in the TC terminal unit
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Maximum module consumption:2 W
Information
Overview
Manuals
Common Applications
Product Precautions
Foxboro AI2 2500M/AI2/XXXXX/XXXXXX supports mixed process-measurement duties through channel-specific sensor selection, including temperature, voltage, current and resistance measurements.
- Provides two isolated analog input channels.
- Accepts thermocouples with a suitable cold-junction terminal unit.
- Supports two-, three- and four-wire resistance measurements.
- Channel 2 has a high-impedance mode for zirconia-probe signals.
A thermocouple circuit uses the terminal-unit temperature for cold-junction compensation. Current measurement instead requires the appropriate shunt termination; changing software alone does not convert one terminal arrangement into the other.
Important Notice: Check the complete sensor-to-controller response before enabling automatic control from the restored measurement.
Foxboro AI2 2500M/AI2/XXXXX/XXXXXX Manuals & Downloads
Foxboro AI2 2500M/AI2/XXXXX/XXXXXX Manufacturer Technical Reference — Selected Pages (PDF)Foxboro AI2 2500M/AI2/XXXXX/XXXXXX Installation & Commissioning Guide (PDF)
The manufacturer excerpt covers the module connection and operating principles. The installation guide provides a separate sequence for wiring and functional checks.
Thermocouple temperature
Acquire thermoelectric signals with the matching CJC termination.
Resistance thermometry
Measure an RTD using its selected lead arrangement.
Transmitter current
Acquire a current signal through the mA shunt terminal unit.
Zirconia measurement
Use the second channel high-impedance input in the configured probe application.
Prepare the affected circuits before installing Foxboro AI2 2500M/AI2/XXXXX/XXXXXX.
1
Identify the sensor type on each input separately.
2
Match the terminal unit to thermocouple, current or resistance service.
3
Preserve thermocouple polarity and appropriate extension wire.
4
Retain the RTD lead configuration selected in the channel setup.
5
Include the current-input shunt in the transmitter voltage budget.
6
Reserve channel 2 for a required high-impedance signal.
7
Apply a stable reference before judging a fluctuating process reading.
8
Verify sensor type, scaling and alarm response before releasing the measurement.
Technical notes
Configure only ranges supported by the installed terminal unit. A selectable software range can still be unsuitable for the physical terminal hardware.
FAQ View All FAQ
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Does selecting a current range make every terminal unit suitable for AI2 2500M/AI2/XXXXX/XXXXXX?No. Current measurement requires the mA terminal unit with its shunt. The configured input type and the physical termination must agree.
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Which input of AI2 2500M/AI2/XXXXX/XXXXXX is intended for high-impedance zirconia signals?The special high-impedance input range is available on channel 2.
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How is cold-junction temperature obtained when AI2 2500M/AI2/XXXXX/XXXXXX measures a thermocouple?An RTD in the thermocouple terminal unit measures the local junction temperature used for compensation.
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Can AI2 2500M/AI2/XXXXX/XXXXXX accommodate a four-wire resistance thermometer?Yes. The resistance input supports two-, three- and four-wire connections when paired with the appropriate termination and configuration.
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Why must thermocouple polarity be checked at AI2 2500M/AI2/XXXXX/XXXXXX?Reversed polarity changes the sign of the sensed thermoelectric voltage and can produce an incorrect temperature response.
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What is the burden used for current acquisition by AI2 2500M/AI2/XXXXX/XXXXXX?The mA terminal unit uses a 5 Ω shunt. Include this burden when assessing the transmitter loop.
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How can a temperature loop be checked after replacing AI2 2500M/AI2/XXXXX/XXXXXX?Apply a suitable sensor simulator at several points within the configured span and compare the displayed temperature, including the selected linearization and cold-junction behavior.
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Why can AI2 2500M/AI2/XXXXX/XXXXXX show the wrong physical value despite responding to an input?An incorrect sensor type, range or engineering scaling can convert a valid electrical signal into an incorrect process value. Check these settings against the connected sensor.
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