NFAR181-S50 Yokogawa RTD Input Module

Yokogawa NFAR181-S50/R8S10 RTD Input Module FIO Subsystem Analog Card

Yokogawa NFAR181-S50/R8S10 RTD Input Module FIO Subsystem Analog Card

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Yokogawa NFAR181-S50 RTD Input Module Configured for high-accuracy temperature acquisition in FIO subsystems, the Yokogawa NFAR181-S50 (NFAR181-S50/R8S10 RTD Input Module)...

رمز المنتج: NFAR181-S50

Manufacturer: Yokogawa
Product No.: NFAR181-S50
Product Type: Analog Input Modules
Product Origin: JAPAN
Payment:T/T, Western Union
Weight: 200g
Shipping port: Xiamen
Warranty: 12 months

وصف التقييمات

Yokogawa NFAR181-S50 RTD Input Module

Configured for high-accuracy temperature acquisition in FIO subsystems, the Yokogawa NFAR181-S50 (NFAR181-S50/R8S10 RTD Input Module) provides direct physical electrical execution for Pt100 sensor integration.

Hardware Specifications

Parameter	Specification
Model	NFAR181-S50/R8S10
Brand	Yokogawa
Origin	Japan
Weight	0.2 kg
Dimensions	Standard FIO rack-mount form factor
Operating Temp	-10 deg C to +55 deg C
Power Consumption	450 mA at 5 V DC
Channel Capacity	12 Isolated channels
Signal Compatibility	Pt100 (3-wire configuration)

Process Control and RTD Signal Processing

The NFAR181-S50 module serves as a specialized input interface for 12-channel Pt100 RTD sensing. It delivers a measurement range of -200 deg C to 800 deg C with a resolution of 1 second per update cycle. Each channel is galvanically isolated to 1500 V AC to prevent ground loop noise and transient voltage propagation into the system backplane. The module employs a 1 mA measurement current to excite the RTD elements, ensuring minimal self-heating errors while maintaining a temperature drift specification of 30 ppm/deg C. Additionally, the unit features configurable burn-out detection, which triggers a status alert within 60 seconds if a sensor open-circuit condition is identified.

Frequently Asked Questions

Q: Can this module accommodate 2-wire RTD configurations?

A: The module is designed specifically for 3-wire Pt100 RTD configurations. Using 2-wire sensors will result in significant measurement inaccuracies due to lead-wire resistance, which cannot be compensated for by the hardware.

Q: Is the update rate of 1 second fixed or adjustable?

A: The data refresh cycle is fixed at 1 second per channel. This timing is optimized for stability in process-level temperature monitoring and cannot be reduced for high-speed dynamic applications.

Q: What is the procedure for clearing a burn-out detection status?

A: Once a sensor fault is detected, the status remains latched in the controller registers. Repair the physical sensor connection, and then perform a reset via the engineering station to clear the diagnostic fault flag.

Field Installation Guidelines

Lead-Wire Resistance: When installing Pt100 sensors, ensure all three lead wires have identical length and gauge. This maintains the bridge balance required for the module to effectively cancel out lead-wire resistance.
Termination and Shielding: Use shielded multi-core cables to connect the RTDs. Terminate the cable shields at a dedicated ground terminal on the cabinet chassis to reduce electromagnetic interference. Avoid routing signal cables in the same conduit as high-voltage AC power or variable frequency drive outputs.
Grounding: The module's isolated architecture relies on a solid cabinet ground connection. Verify that the chassis ground stud is tightly connected to the main earthing bus to ensure that the 1500 V AC isolation rating remains effective.
Environmental Handling: Protect the module from moisture and corrosive gases during installation. Given the -10 deg C to 55 deg C rating, ensure the field enclosure is appropriately ventilated to prevent internal temperatures from exceeding the maximum limit during peak ambient conditions.

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