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Rosemount 42718053 Unheated O2 Transmitter | Oxygen Transmitter

Rosemount 42718053 Unheated O2 Transmitter (Oxygen Transmitter), core spare part for O2 measurement channel of Rosemount continuous gas analyzers, range 2-25% O2, output 4.0V, unheated design, for continuous oxygen concentration detection in industrial process gas and flue gas. Order available.

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Product Details

【Detailed Description】

1. Product Overview

The Rosemount (Emerson) 42718053 is an Unheated O2 Transmitter (Oxygen Transmitter), serving as the core spare part for the oxygen (O2) measurement channel in Rosemount continuous gas analyzers, specifically designed for continuous detection of oxygen (O2) concentration in gas samples.

This oxygen transmitter has a measurement range of 2-25% O2, output signal of 4.0V, and uses an unheated design that operates stably at ambient temperature without a heater, featuring simple structure, low power consumption, and easy maintenance. The transmitter integrates an oxygen sensing element, signal conditioning circuit, and temperature compensation circuit, converting oxygen concentration signals to standard voltage signals output to the analyzer mainboard for processing and display.

Oxygen (O2) concentration measurement is one of the most basic and important parameters in industrial process gas analysis and combustion control. In combustion processes, oxygen concentration directly reflects combustion efficiency: too high oxygen concentration indicates excess air, large heat loss, and fuel waste; too low oxygen concentration indicates incomplete combustion, producing CO and other incomplete combustion products, with safety hazards. By accurately monitoring oxygen concentration in flue gas, air-fuel ratio can be optimized, combustion efficiency improved, fuel consumption reduced, and pollutant emissions minimized.

In chemical processes, oxygen concentration monitoring is used for reaction process control, safety interlock (preventing flammable gas and oxygen mixture from reaching explosion limits), inert gas protection, and product quality control. In natural gas, refining, metallurgy, cement, glass, power industries, oxygen analysis is a key parameter for process control and safety monitoring.

Rosemount Analytical is a globally leading process gas analyzer manufacturer. Its MLT, NGA 2000, X-STREAM series continuous gas analyzers are widely used in petrochemical, natural gas, power, metallurgy, cement, environmental industries. The 42718053 unheated O2 transmitter, as a key spare part for the oxygen measurement channel of these analyzers, has broad applications in industrial process gas analysis worldwide.

As the core component of the analyzer's oxygen channel, the performance of the oxygen transmitter directly affects the accuracy, stability, response speed, and long-term reliability of oxygen measurement. After long-term use, the oxygen transmitter may experience sensitivity decline, zero drift, and slow response, requiring periodic replacement to maintain analyzer measurement performance. For critical applications such as combustion control and safety interlock, it is recommended to keep a spare transmitter for timely replacement when performance declines.

Note: This product is a dedicated oxygen transmitter spare part for gas analyzers. Specific detection principle (paramagnetic/electrochemical), compatible analyzer model, electrical interface, installation method, and other parameters need to be confirmed based on the analyzer model and configuration. Some parameters are marked "Contact via email for confirmation."

2. Specifications

表格

Parameter	Value
Brand	Rosemount (Emerson, USA)
Model	42718053
Product Type	Unheated O2 Transmitter (Oxygen Transmitter)
Measured Gas	O2 (Oxygen)
Measurement Range	2-25% O2
Output Signal	4.0V
Heating Type	Unheated (no heater required)
Detection Principle	Contact via email for confirmation (paramagnetic/electrochemical, subject to analyzer config)
Application	O2 measurement channel spare part for Rosemount continuous gas analyzers
Compatible Analyzers	Contact via email for confirmation (MLT/NGA2000/X-STREAM series, subject to specific config)
Supply Voltage	Contact via email for confirmation (reference analyzer internal power supply)
Operating Temperature	Contact via email for confirmation (reference analyzer internal 0-50°C)
Storage Temperature	Contact via email for confirmation (reference -20 to 70°C)
Weight	Contact via email for confirmation
Installation	Contact via email for confirmation (analyzer O2 channel dedicated interface)
Similar Part Number	42718059 (Heated O2 transmitter, 2-25% O2, HEATED)
Certifications	Contact via email for confirmation (with analyzer overall certification)
Origin	Contact via email for confirmation (Emerson global manufacturing)
HS Code	Contact via email for confirmation (reference 90271000)
Stock Status	Order available
Warranty	12 months

3. Key Features

Genuine Rosemount Spare Part, Compatible with Continuous Gas Analyzer O2 Channel — 42718053 is a genuine Rosemount unheated O2 transmitter spare part, specifically designed for the O2 measurement channel of Rosemount continuous gas analyzers. O2 channel interface, electrical connection, and signal output all meet original factory specifications, ensuring the analyzer restores original oxygen measurement performance after replacement.
Unheated Design, Simple Structure Low Power Consumption — Unheated design operates stably at ambient temperature without heater or temperature control circuit, featuring simple structure, low power consumption, low heat generation, and easy maintenance. Suitable for oxygen concentration measurement of ambient temperature gas samples, reducing analyzer overall power consumption and maintenance cost.
2-25% O2 Wide Range, Covers Common Industrial Oxygen Range — Measurement range 2-25% O2 covers the common range of oxygen concentration in industrial process gas and flue gas (from low-oxygen inert gas protection to near-air 20.9%), suitable for combustion control, process monitoring, safety interlock and other applications, one transmitter meets multiple oxygen measurement needs.
4.0V Standard Voltage Output, Stable Signal Anti-interference — Outputs 4.0V standard voltage signal with large signal amplitude, strong anti-interference capability, and stable transmission. Transmitted to mainboard via analyzer internal cable for signal processing and concentration calculation, ensuring accuracy and stability of oxygen concentration measurement signal, reducing interference and attenuation during signal transmission.
Integrated Signal Conditioning and Temperature Compensation, Accurate Stable Measurement — Transmitter integrates signal conditioning circuit and temperature compensation circuit, amplifying, filtering, linearizing, and temperature-compensating the original signal from the oxygen sensing element, ensuring oxygen concentration measurement accuracy and stability at different ambient temperatures, reducing the impact of temperature changes on measurement results.
Core Component for Oxygen Measurement, Key for Combustion Optimization — O2 transmitter is the core component of the analyzer's O2 measurement channel. Its performance directly determines oxygen concentration measurement accuracy, stability, and response speed. Accurate oxygen concentration measurement is the foundation for combustion process optimization (air-fuel ratio control, improved combustion efficiency, reduced fuel consumption, reduced NOx/CO emissions), process control, and safety interlock.
Plug-and-play Module Design, Easy Replacement and Maintenance — Modular design installed in analyzer O2 channel, connected through dedicated interface for quick connection. During replacement, simply remove old transmitter and install new one, easy operation, professional maintenance personnel can complete replacement in short time, reducing analyzer downtime and maintenance cost.
Long-life Design, Reduced Maintenance Frequency — Uses high-quality oxygen sensing element and stable signal conditioning circuit, with long service life under normal operating conditions, reducing frequent replacement maintenance costs and downtime losses. It is recommended to replace promptly when the transmitter shows significant sensitivity decline, excessive zero drift, or slow response, based on analyzer maintenance cycle and performance calibration results.
Wide Applications in Industrial Process and Environmental Monitoring — Oxygen concentration measurement is widely used for flue gas oxygen monitoring and combustion optimization in coal-fired power plants, industrial boilers, waste incinerators, cement kilns, glass furnaces; process gas oxygen monitoring in petrochemical, natural gas, refining, metallurgy industries; and inert gas protection, reaction process control, safety interlock applications. It is one of the most basic measurement parameters in industrial process analysis.
Emerson Quality Assurance, Professional Channel Supply Worldwide Delivery — As a globally leading process analytical instrument brand under Emerson, Rosemount products undergo strict quality control and factory testing. Supplies genuine gas analyzer spare parts through professional procurement channels, supports single unit and bulk project orders, can provide analyzer overall spare parts packages (O2 transmitter + IR detector + source + chopper + sample cell + pump + filter combination) and annual spare parts framework agreements, supports worldwide delivery and expedited service.

5. Model Explanation

Product Model: 42718053

Product Description: Rosemount Unheated O2 Transmitter (Oxygen Transmitter), range 2-25% O2, output 4.0V, core spare part for O2 measurement channel of Rosemount continuous gas analyzers

Model Explanation:

42718053 is the part number for Rosemount gas analyzer spare parts, corresponding to the Unheated O2 Transmitter (Oxygen Transmitter). In this spare part numbering system, different numbers correspond to oxygen transmitters with different configurations.

Similar Part Numbers Reference:

表格

Part Number	Description
42718053	Unheated O2 Transmitter (UNHEATED), 2-25% O2, 4.0V, this product
42718059	Heated O2 Transmitter (HEATED), 2-25% O2

Note: The above similar part number information comes from public import/export trade data. Specific correspondence is subject to Emerson official spare parts list, marked "Contact via email for confirmation."

Unheated vs Heated Difference:

Unheated (42718053): No heater required, operates at ambient temperature, simple structure, low power consumption, easy maintenance, suitable for ambient temperature gas sample oxygen measurement
Heated (42718059): Built-in heater maintains sensing element at constant operating temperature, more stable measurement, faster response, suitable for applications requiring higher precision and response speed, higher power consumption

Oxygen Measurement Technology (Contact via email for confirmation, subject to analyzer config):

Paramagnetic: Utilizes paramagnetism of oxygen, oxygen molecules attracted in non-uniform magnetic field, calculates O2 concentration by measuring magnetic pressure/torque changes, high precision, good stability, long life, mainstream technology for industrial process oxygen measurement
Electrochemical: Utilizes reduction reaction of oxygen at electrochemical sensor cathode to generate current proportional to oxygen concentration, simple structure, low cost, high sensitivity, suitable for trace and constant oxygen measurement

Compatible Analyzer Series (Contact via email for confirmation):

Rosemount MLT / MLT1 / MLT3 multi-component gas analyzers
Rosemount NGA 2000 series gas analyzers
Rosemount X-STREAM series continuous gas analyzers
Other Rosemount continuous gas analyzers with O2 measurement channel

Oxygen (O2) Basics:

Molecular formula: O2, molecular weight 32.00
Oxygen content in air approx. 20.9%
Oxygen is one of the three elements of combustion (fuel, oxidizer, ignition source), combustible-supporting gas
Industrial applications: combustion control, process monitoring, safety interlock, inert gas protection, product quality control
Safety notes: too high O2 (>23.5%) has oxygen-enriched combustion/explosion risk; too low O2 (<19.5%) has asphyxiation risk

Related Spare Parts (ordered separately, Contact via email for confirmation):

IR Detector
IR Source
Chopper Wheel / Motor
Sample Cell
Sample pump, filter, flow controller
Analyzer Mainboard / Signal Processing Board

Official Documentation Reference:

Rosemount MLT1 Multi-Component Gas Analyzer Product Data Sheet
Rosemount NGA 2000 Instruction Manual (O2 measurement chapter)
Analyzer Spare Parts List

6. Why Choose Us

Professional Procurement, Genuine Quality Guaranteed — All Rosemount gas analyzer spare parts obtained through professional procurement channels, ensuring genuine Emerson/Rosemount original products with product identification and factory quality documents, 12-month quality warranty. Pre-shipment appearance inspection, model confirmation, part number verification, and packaging check performed.
Worldwide Delivery, Professional Instrument Logistics — DHL/FedEx/UPS international courier, global delivery available. Precision analytical instrument spare parts use shock-proof moisture-proof anti-static professional packaging, ensuring safe transport of O2 transmitters and other precision electronic components. Expedited logistics and customs clearance available, delivery to 200+ countries, meeting emergency repair needs.
Professional Technical Support, Full-process Service from Selection to Installation — O2 transmitter selection consultation (confirming analyzer model, O2 range, heated/unheated type, existing part number, version configuration matching), installation/replacement guidance (O2 channel disassembly, transmitter replacement, calibration verification process), fault diagnosis (measurement abnormality/zero drift/sensitivity decline/slow response cause analysis), and spare parts list review, helping users correctly select, install and maintain.
Flexible Procurement, Analyzer Spare Parts Packages and Framework Agreements — Single transmitter and bulk project orders, tiered discounts. Gas analyzer overall spare parts packages (O2 transmitter + IR detector + UV detector + source + chopper + sample cell + pump + filter + sensor combination) and annual framework agreements available, helping users optimize spare parts inventory, reduce procurement cost, minimize downtime risk.
Pre-shipment Verification, Test Report Available — Appearance, packaging, model, part number checks before shipment; transmitter appearance inspection, interface check, and factory quality document verification report available if necessary, ensuring delivered spare part model-accurate, in good condition, well-packaged. For emergency repair needs (combustion control data loss, safety interlock failure, analyzer failure causing production interruption, process control emergency), priority inventory coordination and expedited shipping available.

7. Frequently Asked Questions (FAQ)

Q1: What is 42718053? Which analyzer is it used in? What does it measure?

A: The 42718053 is a Rosemount (Emerson) Unheated O2 Transmitter (Oxygen Transmitter), a core spare part for the oxygen (O2) measurement channel of continuous gas analyzers.

Basic info: Brand Rosemount (Emerson, USA), model 42718053, type Unheated O2 Transmitter, measured gas O2 (Oxygen), range 2-25% O2, output 4.0V, heating type Unheated (no heater required).

Which analyzer? Mainly used in Rosemount MLT, NGA 2000, X-STREAM series continuous gas analyzers' O2 measurement channels, installed in the analyzer's O2 channel module as the core sensing and transmission component for oxygen concentration measurement. Specific compatible models need to be confirmed based on your analyzer model and configuration. Contact via email for confirmation.

What does it measure? Continuously measures oxygen (O2) concentration in gas samples, range 2-25% O2, covering the common range of oxygen concentration in industrial process gas and flue gas. Main applications: flue gas oxygen monitoring and combustion optimization (air-fuel ratio control) in coal-fired power plants, industrial boilers, waste incinerators, cement kilns, glass furnaces; process gas oxygen monitoring in petrochemical, natural gas, refining, metallurgy industries; inert gas protection, reaction process control, safety interlock (preventing flammable gas and oxygen mixture from reaching explosion limits); product quality control and process optimization.

Note: 42718053 is unheated. The same series also has 42718059 heated. Please confirm whether your analyzer uses heated or unheated O2 transmitter to avoid purchasing wrong. If uncertain, contact via email for confirmation, provide analyzer model and old transmitter label photo, we can help identify.

Q2: What are the symptoms of a failed O2 transmitter? How to judge replacement need? How often to replace?

A: The O2 transmitter is the core component of the analyzer's O2 measurement channel. After long-term use, it will age and performance decline. Common failure symptoms and replacement criteria:

Common symptoms of failed/aging O2 transmitter:

Abnormal measurement when passing known concentration O2 standard gas (e.g. air 20.9% O2 or high purity nitrogen 0% O2), cannot recover via calibration
Severe zero drift, unstable zero when passing zero gas (high purity nitrogen), cannot recover via auto zero
Span drift / poor linearity, span calibration goes out of tolerance shortly after calibration
Slow response, T90 response time significantly longer than specification
Measurement value jumping / high noise, especially obvious at low concentration
Analyzer alarms: "O2 channel fault", "sensor fault", "signal abnormality" (refer to analyzer manual for specific alarm codes)
Calibration cannot pass, zero/span calibration fails or calibration parameters exceed allowable range

How to judge replacement need?

Performance verification: Periodically pass O2 standard gas (e.g. air 20.9% O2) for zero and span verification. If measurement error exceeds analyzer allowable range (usually ±2%FS or ±5%FS), and cannot recover after cleaning, calibration, adjustment — transmitter needs replacement.
Calibration trend analysis: Record zero and span parameters each calibration. If sensitivity (span gain) continuously declines, zero offset continuously increases — transmitter is aging.
Response time test: Pass step O2 concentration change, measure T90 response time. If significantly exceeds analyzer spec (usually 10-30 seconds) — transmitter aging.
Preventive replacement: Per analyzer maintenance manual recommended cycle, combined with actual operating environment (high temp, high humidity, corrosive gas, high dust accelerate aging), perform preventive replacement.

How often to replace? Service life depends on multiple factors:

Good conditions (clean gas, constant temp, ambient): 3-5+ years
General industrial process gas: 2-4 years
Harsh conditions (high temp, high humidity, corrosive gas, high dust): 1-3 years
Combustion flue gas continuous monitoring: 2-3 years (recommend preventive replacement)

Recommendation: Comprehensive performance verification every 6-12 months (pass standard gas test zero, span, response time); establish calibration parameter trend records; for critical applications (combustion control, safety interlock, environmental monitoring), recommend keeping a spare transmitter for timely replacement. After replacement, must perform zero and span calibration, and linearity verification if necessary.

Q3: How to replace the O2 transmitter? Is calibration needed after replacement? Can I do it myself?

A: O2 transmitter replacement requires certain professional knowledge and skills, recommended to be performed by trained professional maintenance personnel.

General replacement steps (refer to analyzer manual for specifics):

Preparation: Confirm analyzer stopped and powered off (or enter maintenance mode per manual); prepare new O2 transmitter (confirm model 42718053 match, unheated); prepare tools (screwdriver, hex wrench, anti-static wrist strap, lint-free cloth); record current analyzer calibration parameters.
Remove old transmitter: Open analyzer housing, locate O2 measurement channel module; disconnect transmitter electrical connection (plug/ribbon cable); loosen fixing screws/clips, carefully remove old transmitter. Note: avoid collision and contamination of other components.
Install new transmitter: Check new transmitter appearance and interface; align to installation position, gently push in until seated; tighten fixing screws (moderate force); connect electrical plug, confirm firm connection.
Close housing, power on warm up: Check no tools/foreign objects left inside; close analyzer housing; power on, let analyzer warm up and stabilize (usually 30 min to 2 hours, refer to manual).
Calibration verification: Pass zero gas (high purity nitrogen), perform zero calibration; pass O2 span standard gas (e.g. air 20.9% O2 or known concentration O2 standard gas), perform span calibration; perform multi-point linearity verification if necessary; confirm measurement error within allowable range.

Is calibration needed after replacement? Must calibrate. After O2 transmitter replacement, due to differences in sensitivity, zero, and response characteristics between new and old transmitters, zero and span calibration must be performed, and linearity calibration if necessary. Using without calibration will result in inaccurate oxygen concentration measurements. Calibration O2 standard gases must be Certified Reference Material (CRM) with accurate traceable concentration values covering the analyzer measurement range.

Can I do it myself?

If you or your maintenance personnel have received Rosemount gas analyzer maintenance training, are familiar with analyzer structure and calibration procedures, and have appropriate tools and O2 standard gases — you can replace it yourself.
If no experience — recommend contacting Emerson official service or professional gas analyzer maintenance service provider for replacement and calibration.
Notes: Wear anti-static wrist strap to avoid electrostatic damage to transmitter electronics; do not touch transmitter sensing element sensitive surface with hands; avoid touching other analyzer optical/electronic components during replacement; for flameproof analyzers, replacement must comply with explosion-proof regulations by qualified personnel.

Q4: What is the difference between unheated and heated O2 transmitters? How to choose? Which is 42718053?

A: The 42718053 is an Unheated O2 transmitter. The same series 42718059 is a Heated O2 transmitter. Main differences:

Unheated (42718053):

Design: No heater required, transmitter operates at ambient temperature
Advantages: Simple structure, low power consumption, low heat generation, easy maintenance, lower cost
Disadvantages: Measurement precision and stability relatively more affected by ambient temperature, relatively slower response
Suitable for: Ambient temperature gas samples, general industrial process O2 monitoring, applications with moderate precision and response speed requirements

Heated (42718059):

Design: Built-in heater and temperature control circuit, maintains sensing element at constant operating temperature
Advantages: High measurement precision, good stability, less affected by ambient temperature, fast response
Disadvantages: Complex structure, high power consumption, high heat generation, higher maintenance cost, higher cost
Suitable for: Applications requiring high measurement precision and fast response, scenarios with large ambient temperature fluctuations, critical process control and safety interlock

How to choose?

Choose per analyzer original configuration: The safest way is to check your analyzer's existing O2 transmitter model or part number — if originally unheated, replace with unheated; if originally heated, replace with heated, keeping configuration consistent.
Choose per application needs:
- General combustion control, process monitoring, ambient temperature gas → unheated (42718053) is sufficient
- High-precision process control, fast response requirement, large ambient temperature fluctuation → heated (42718059) more suitable
Choose per budget: Unheated lower cost, heated higher cost, can weigh based on budget and application importance.

Note: Although both 42718053 and 42718059 are 2-25% O2 range O2 transmitters, they have different heating types, and electrical interfaces and power consumption may differ — cannot be interchanged arbitrarily. Please confirm your analyzer configuration before purchasing. If uncertain, contact via email for confirmation, provide analyzer model and existing old transmitter information, we can help identify.

Q5: In stock? Lead time? Price?

A: Currently Order Available. The 42718053 is a dedicated unheated O2 transmitter spare part for Rosemount gas analyzers, a professional analytical instrument spare part with limited market inventory, specific stock fluctuates.

Lead time: Standard 4-8 weeks (ordering from Emerson through professional channels or global stock allocation). Dedicated gas analyzer spare parts usually need to be allocated from Emerson factory or regional spare parts centers; some common spare parts may be in stock, specific subject to formal quotation.
Price: Subject to formal quotation, depends on quantity, supply channel, whether includes technical service and calibration support. As a core electronic spare part for gas analyzers, it is a medium-to-high value spare part; bulk procurement enjoys tiered discounts.
Expedited service: For urgent needs (combustion control data loss, safety interlock failure, analyzer failure causing production interruption, project commissioning emergency), we can try to coordinate global stock or expedited ordering, please contact sales team.
Please indicate: complete analyzer model, O2 range, heated/unheated type, existing old transmitter model, required quantity, desired delivery time and destination when inquiring; we will coordinate fastest delivery and optimal price.
If you need to purchase other related analyzer spare parts simultaneously (IR detector, IR source, chopper wheel, sample cell, sample pump, filter, other gas transmitters, etc.), we can provide complete gas analyzer spare parts package combined quotation with more favorable pricing, and annual spare parts framework agreement service.

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