Product Details
The Yokogawa ZR402G-T-E-E-A/H/SCT, also cataloged as the ZR402G Separate type Zirconia Oxygen Analyzer, Converter, operates as a dedicated hardware component for continuous gas phase oxygen concentration signal processing within Yokogawa process automation networks.
Suffix Breakdown & Model Matrix
The Yokogawa ZR402G oxygen analyzer converter uses a structured order option code matrix to specify thread entry interfaces, display languages, protective hardware, and physical tagging.
| Suffix / Option | Specification & Hardware Definition |
|---|---|
| ZR402G | Base model converter for separate-type zirconia oxygen measurement systems |
| -T | Conduit thread connection: 1/2 NPT |
| -E | Display language interface: English |
| -E | Instruction manual documentation: English |
| -A | Standard functional revision: Always -A |
| /H | Hardware Option: Protective rain and sun hood |
| /SCT | Material Tagging Option: Stainless steel tag plate |
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | ZR402G-T-E-E-A/H/SCT |
| Brand | Yokogawa |
| Origin | Japan |
| Weight | Approx. 6 kg (Shipping weight 10 kg) |
| Dimensions | Standard enclosure sizing for panel/wall/pipe mounting |
| Operating Temp | -20 to 55 deg C |
| Power Consumption | Max 300 W (Approx 100 W nominal operation) |
| Display Type | 320 x 240 dot matrix LCD screen with integrated touchscreen |
| Analog Output Signal | Two-point 4-20 mA DC (Maximum load resistance 550 ohm) |
| Contact Output Signal | Four points (Includes one fail-safe normally open contact) |
| Contact Input | Two points |
| Analog Input | One point (4-20 mA temperature/process input) |
| Power Supply Voltage | Rated 100 to 240 VAC (Operating range 85 to 264 VAC) |
| Ambient Humidity | 0 to 95% RH (non-condensing) |
| Cable Conduit Entries | Eight entry ports (1/2 NPT interface configured) |
| Enclosure Material | Aluminum alloy with polyurethane corrosion-resistant finish |
Process Control & DCS Instrument Characteristics
The ZR402G converter processes raw millivolt electromotive force (EMF) signals generated by remote zirconia oxygen detectors. Operating across a dual 4-20 mA HART loop protocol layer, the unit provides high channel-to-channel isolation between internal AC power supplies, detector heater drives, and low-level analog I/O loops. The hardware incorporates automated dynamic cold junction compensation (CJC) algorithms and sensor diagnostics to track cell resistance and probe response decay. Isolated contact inputs and relay outputs execute automated calibration sequence timing, fault signaling, and blowback purges in coordination with main distributed control systems.
Frequently Asked Questions
Q: How is the fail-safe contact output configured inside the ZR402G unit?
A: The converter incorporates four total contact outputs, one of which is specifically configured as a fail-safe relay with a normally open (NO) contact configuration. Upon total loss of AC power supply or critical internal processor fault, this contact drops out to signal an immediate hardware failure state to the DCS.
Q: What load resistance limits apply to the dual isolated 4-20 mA analog outputs?
A: Each 4-20 mA DC current output channel supports a maximum external loop load resistance of 550 ohm. Exceeding 550 ohm causes signal clipping and degrades communication stability when HART field devices or line recorders are connected in series.
Field Installation Guidelines
- Mount the aluminum alloy housing securely to a 2-inch vertical/horizontal pipe, flat panel, or wall using approved mounting brackets. Ensure the rain hood (/H) is correctly fitted over the top casing when exposed to outdoor environments.
- Maintain a minimum thread engagement of 5 full 1/2 NPT thread turns on all electrical conduit connections. Seal unused conduit holes with the provided 1/2 NPT threaded plugs to preserve enclosure weatherproofing.
- Route low-voltage zirconia sensor signal wires and AC power lines in separate grounded metal conduits to prevent inductive noise interference with cell EMF measurements.
- Ground the main internal and external enclosure chassis lugs to a dedicated low-impedance earth ground point (less than 10 ohm ground resistance).
- Ensure operating AC supply voltage remains strictly within 85 to 264 VAC before powering on the converter touchscreen interface.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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