Yokogawa K9471DS Cover Assembly for ZR22G/ZR402G/ZR802G Zirconia Oxygen Analyzer
Overview
The Yokogawa K9471DS Cover Assembly is a genuine replacement protective cover for Yokogawa’s ZR22G, ZR402G, and ZR802G Zirconia Oxygen and High-Temperature Humidity Analyzer detector units. This assembly forms the outer housing lid that shields the detector’s internal zirconia sensor, terminal connections, and heater components from dust, moisture, and mechanical damage in combustion monitoring environments such as boiler flues, furnace stacks, and incinerator exhausts. Seven Star LLC supplies the Yokogawa K9471DS to power plants, cement plants, refineries, and industrial boiler operators across Oman and the GCC who maintain Yokogawa in-situ zirconia oxygen analyzers as part of their combustion control and emissions monitoring programs.
The detector unit of a zirconia oxygen analyzer is mounted directly on or near the flue or duct being measured, placing it in one of the harshest locations in a combustion monitoring system — exposed to high ambient temperature, vibration, airborne particulate, and, in outdoor installations, weather. The K9471DS cover assembly is the physical barrier that keeps these conditions away from the sensitive zirconia cell and electrical connections inside, and a cracked, corroded, or missing cover is a direct path to premature detector failure or unsafe operation.
Operating Principle
As a structural and protective component rather than active sensing element, the K9471DS cover assembly does not perform a measurement function itself; instead, it maintains the environmental integrity of the ZR22G/ZR402G/ZR802G detector housing so that the zirconia cell inside can perform its oxygen measurement reliably. The zirconia sensor beneath the cover operates at high temperature, generating a voltage signal proportional to the oxygen partial-pressure differential between the flue gas sample and a reference air path; maintaining a sealed, correctly fitted cover assembly protects this reference air path and the cell’s electrical connections from the contamination and moisture ingress that would otherwise skew or destroy the oxygen reading.
Engineering Design
The K9471DS is manufactured to Yokogawa’s original equipment specification for the ZR22G, ZR402G, and ZR802G detector series, ensuring the replacement cover matches the exact mounting bolt pattern, seal interface, and material specification of the factory-installed original. This precise fit is critical on a detector unit that must maintain an environmental seal in continuous outdoor or high-temperature duct-side service. The cover assembly is designed for straightforward field replacement during routine detector maintenance, allowing plant instrumentation technicians to restore full environmental protection without removing the entire detector unit from its process connection.
Key Features
As a factory-specification spare part, the Yokogawa K9471DS gives plant maintenance teams a direct, reliable path to restoring detector housing integrity on in-situ zirconia oxygen analyzers without waiting on a full detector replacement or manufacturer service visit.
- Genuine Yokogawa factory part number K9471DS, matched exactly to ZR22G, ZR402G, and ZR802G detector specifications
- Restores the environmental seal protecting the zirconia sensor cell and internal wiring from dust, moisture, and process contamination
- Engineered for field replacement without full detector removal from the process connection
- Suited to continuous outdoor and high-temperature flue-mounted installation
- Maintains compatibility with existing detector wiring and mounting hardware
Applications
The Yokogawa K9471DS cover assembly is used as a maintenance spare part for ZR22G, ZR402G, and ZR802G zirconia oxygen analyzer detector units installed on boiler flues, industrial furnace stacks, waste incinerators, cement kiln exhausts, and other combustion sources where continuous oxygen monitoring supports combustion efficiency control, fuel savings, and emissions compliance. It is stocked by power generation facilities, cement and lime plants, refineries, and industrial boiler operators across Oman and the GCC maintaining an active fleet of Yokogawa in-situ combustion analyzers.
Technical Specifications
| Manufacturer | Yokogawa Electric Corporation |
| Part Number | K9471DS |
| Description | Cover Assembly (detector housing lid) |
| Compatible Models | ZR22G, ZR402G, ZR802G Zirconia Oxygen / High-Temperature Humidity Analyzer |
| Function | Protective housing cover for detector-mounted zirconia sensor cell and wiring |
| Installation | Field-replaceable, factory bolt pattern and seal interface |
| Typical Service Location | Boiler flue, furnace stack, incinerator exhaust, kiln duct |
Maintenance Considerations
Flue-mounted zirconia oxygen detectors operate continuously in some of the most thermally and mechanically demanding locations in a combustion plant, and the housing cover is the first line of defense against the ingress of soot, moisture, and corrosive flue gas condensate that would otherwise reach the sensor and terminal compartment. Yokogawa recommends inspecting the detector cover assembly during scheduled zirconia cell replacement intervals, since a cover gasket or housing that has degraded from prolonged heat cycling is a common but easily overlooked cause of intermittent detector faults, moisture-related signal drift, or accelerated cell wear. Replacing the K9471DS as part of a planned maintenance cycle, rather than waiting for a visible failure, helps combustion control and emissions monitoring systems maintain the continuous, reliable oxygen readings that boiler efficiency optimization and regulatory compliance reporting depend on.
Because Yokogawa zirconia oxygen analyzers are frequently installed in locations that require scaffolding, hot-work permits, or process shutdown coordination to access, plant maintenance teams benefit from keeping a genuine K9471DS cover assembly in stock ahead of a scheduled outage window rather than sourcing it reactively once a fault is identified. Seven Star LLC supports this planning by stocking Yokogawa combustion analyzer spares for fast dispatch to sites across Oman and the wider GCC region.
Why Choose Seven Star LLC
Seven Star LLC is an experienced supplier of Yokogawa combustion analyzer spare parts across Oman and the GCC, helping power, cement, and refining operators keep in-situ zirconia oxygen detectors sealed and protected against the harsh conditions of flue-side installation. Our team can help confirm the correct cover assembly and related detector spares for your specific ZR-series analyzer model and supports fast regional delivery to minimize combustion monitoring downtime.
Get a Quote
Contact Seven Star LLC for pricing, lead time, and availability on the Yokogawa K9471DS cover assembly, or to confirm compatibility with your ZR22G, ZR402G, or ZR802G detector unit.
Browse the full Yokogawa range or see more Gas Analyzer Accessories products supplied by Seven Star LLC in Oman and the GCC.
Yokogawa product families on this page
Pressure is covered by the DPharp transmitters: the EJX110A differential pressure transmitter, the EJX530A and EJA530E in-line gauge pressure transmitters and the EJX910A multivariable transmitter. The ADMAG AXW is the magnetic flowmeter line, and the YTA610 and YTA710 are temperature transmitters. Analyzers include the FLXA402 four-wire and FLXA21 two-wire liquid analyzers, the TDLS8000 tunable diode laser gas analyzer and spare parts for zirconia oxygen analyzers, such as the E7042UD cell assembly kit for the ZR22 detector. Control hardware includes CENTUM VP I/O modules like the ADV161 digital input module and the YS1700 programmable indicating controller.Where Yokogawa instruments are used
EJA and EJX transmitters measure pressure, level and DP flow throughout oil and gas, chemical and power plants. Zirconia oxygen analyzers and the TDLS8000 are used for combustion control on boilers and fired heaters. FLXA analyzers monitor pH, conductivity and dissolved oxygen in water and process streams, and CENTUM modules are bought as replacements for running control systems.Ordering Yokogawa parts: what we need
Send the model and suffix code and the serial number from the nameplate, and for CENTUM modules the style code as well. For transmitters without a code we need span, output protocol, wetted materials, process connection, housing and the approval required. For oxygen analyzer spare parts give the detector and converter models, for example ZR22G and ZR402G, and the part number.Browse Yokogawa products by category: PLC & I/O Cards, Flowmeters, Pressure Instrumentation, Automation Accessories, Temperature Instrumentation.
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