Yokogawa ZR402G-T-E-E-A/HS/SCT Separate Zirconia Oxygen Analyzer Converter

Configured for precise gas-phase oxygen concentration processing, remote sensor cell signal decoding, and automated field-level calibration sequences within industrial combustion control networks, the Yokogawa ZR402G-T-E-E-A/H/SCT, also cataloged as the ZR402G Separate type Zirconia Oxygen Analyzer, Converter, provides direct physical and electrical execution. The instrument-grade control unit manages high-temperature zirconia detector arrays directly through a centralized, robust aluminum alloy field enclosure.

Hardware Specifications

Process Control & DCS Instrumentation Rails

• 4-20 mA HART Loop Protocol and Channel-to-Channel Isolation The converter chassis incorporates dual isolated 4-20 mA DC analog output loops configured to transmit gas concentration values directly to master distributed control networks. Independent galvanic isolation barriers protect the measurement logic from external common-mode voltages and ground loops up to standard high-potential thresholds, ensuring stable data transmission pathways without distorting adjacent 4-20 mA HART loop networks.
• Cold Junction Compensation (CJC) and Sensor Conversion Pathways The internal analog-to-digital processing core manages high-speed voltage transformation pathways from the remote zirconia sensor cell. The unit executes automatic temperature compensation algorithms natively at the hardware tier by tracking the sensor's internal thermocouple emf, converting millivolt raw sensor potentials directly into linear oxygen percentage values within pre-set conversion time indices.

Frequently Asked Questions

Q: How does the maximum 300 W power consumption rating correlate with the standard 100 W ordinary operating load?

A: The converter draws up to 300 W during initial system startup sequences when it energizes the internal heating element of the remote zirconia probe. Once the remote cell reaches its stable, high-temperature operational plateau, the internal thermal regulation loop minimizes power consumption down to an approximate 100 W baseline.

Q: What is the fail-safe behavioral configuration of the contact output signals during a system crash?

A: Of the four integrated contact outputs, one is hardwired as a dedicated fail-safe contact configured normally open (NO). Upon a total loss of input AC power, internal CPU watchdog timeouts, or primary logic processing faults, this relay de-energizes instantly to open the safety loop and flag an alarm to the supervising DCS.