ABB 856666 Oxygen Sensor with Connector

ABB 856666 is an oxygen sensor spare part supplied with a connector for oxygen measurement systems. The assembly is provided as a replacement consumption component and includes the sensor, pressure plate, and installation instructions. It is intended for maintenance and replacement applications where the original oxygen sensing element must be renewed to maintain measurement performance.

Product Function

The oxygen sensor serves as the sensing element within an oxygen measurement system. As a consumable maintenance component, it is periodically replaced according to service requirements and operating conditions.

ABB classifies this item as a consumption part, indicating that it is intended for routine maintenance and lifecycle replacement rather than permanent installation equipment.

Package Contents

The supplied package includes:

• 1 oxygen sensor with connector plug.

• 1 pressure plate.

• 1 letter of instructions.

According to the supplied technical information, the required O-ring material number 650221 is not included and must be ordered separately.

Replacement Information

This product is supplied under ABB product ID 856666 and replaces the previous product number:

• 20404-4-0856666

When ordering replacement parts, users should verify compatibility with the installed oxygen measurement equipment and ensure that the required O-ring is included in the maintenance order if replacement is necessary.

Physical Characteristics

The sensor assembly is supplied as a compact spare part with a net weight of approximately 0.04 kg. The product dimensions are suitable for storage as a maintenance spare and shipment in standard service-part packaging.

Technical Specifications

Ordering and Maintenance Considerations

The sensor is supplied as an individual spare part with a minimum order quantity of one piece. ABB specifies a recommended amount of 0.5 year, which may be used as a maintenance planning reference for spare parts management.

Before installation, maintenance personnel should confirm that the corresponding O-ring (material number 650221) is available if replacement of the sealing element is required.

Frequently Asked Questions

Q: What is included with ABB 856666?

A: The package contains one oxygen sensor with connector, one pressure plate, and one instruction letter. The required O-ring is not included.

Q: Is the sealing O-ring supplied with the sensor?

A: No. ABB specifies that O-ring material number 650221 must be ordered separately.

Q: Does ABB 856666 replace an earlier part number?

A: Yes. ABB identifies 20404-4-0856666 as the replaced product ID for this oxygen sensor assembly.