AMM22T YOKOGAWA Centum Series Datasheet & Technical Manual

AMM22T YOKOGAWA Thermocouple Input Multiplexer

AMM22T YOKOGAWA Thermocouple Input Multiplexer

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YOKOGAWA AMM22T Thermocouple Input Multiplexer Module The YOKOGAWA AMM22T, also cataloged as the AMM22T Thermocouple Input Multiplexer Module, operates as...

SKU: AMM22T

Manufacturer: Yokogawa
Product No.: AMM22T
Product Type: Analog Input Modules
Product Origin: Japan
Payment:T/T, Western Union
Weight: 500g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

YOKOGAWA AMM22T Thermocouple Input Multiplexer Module

The YOKOGAWA AMM22T, also cataloged as the AMM22T Thermocouple Input Multiplexer Module, operates as a dedicated hardware component for multi-channel thermal data acquisition and signal conditioning within Centum CS and Centum VP systems. This module provides direct electrical interface for various thermocouple types, facilitating high-density temperature monitoring while minimizing external wiring requirements through internal signal multiplexing.

Hardware Specifications

Parameter	Specification
Model	AMM22T
Brand	YOKOGAWA
Origin	USA
Weight	0.5 kg
Dimensions	5.1 cm x 7.6 cm x 22.9 cm
Operating Temp	0 deg C to 55 deg C
Power Consumption	5 W
Input Types	J, K, T, E, R, S, B, N
Input Impedance	100 MOhm
Output Range	0 to 20 mA or 4 to 20 mA

DCS Process Control & Cold Junction Compensation

The AMM22T incorporates localized Cold Junction Compensation (CJC) circuitry to maintain measurement precision despite fluctuations in panel ambient temperatures. To ensure signal integrity, the module maintains a Common Mode Rejection Ratio (CMRR) exceeding 60 dB, which mitigates electrical noise interference common in high-density industrial control environments. The hardware supports configurable output scaling (0-20 mA or 4-20 mA) and provides discrete disconnection detection features, allowing for accurate fault monitoring within the process control loop.

Frequently Asked Questions

Q: Does this module support parallel input connections from a single thermocouple to multiple I/O channels?

A: No. Parallel input connections are not permitted as they introduce impedance mismatching and common-mode noise, which compromise the measurement accuracy of the multiplexer.

Q: How should the disconnection detection feature be configured for optimal safety?

A: Disconnection detection should be set based on the specific application safety requirements (UP/DOWN/OFF). If a thermocouple break must trigger a defined safety state in the controller, ensure the logic configuration is aligned with the specific hardware burnout detection setting.

Field Installation Guidelines

Ensure the module is mounted firmly within the designated I/O nest using the M4 screw terminals to guarantee stable ground contact.
Terminate thermocouple leads directly to the module input terminals; avoid splicing or utilizing intermediate terminal blocks where possible to prevent thermoelectric EMF errors at the connections.
Verify that the shield drain wire of the thermocouple cable is grounded at the DCS cabinet earth bus bar to maintain the 60 dB CMRR performance.
Confirm the 24 V DC power supply is stable and free from significant ripple before finalizing the system start-up.
Calibrate the module after initial installation, particularly if the operating environment ambient temperature deviates from the baseline, to compensate for any initial thermal offsets.

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