ZS8100-NH3 Process Ammonia Analyzer
TDLAS ammonia slip analyzer for SCR/SNCR optimization and emission control
- Range
- Configured for the NH₃ duty
- Accuracy
- Confirmed for the selected range and matrix
- Response
- Confirmed for the installation and sample path
- Output
- Project-configured I/O package
Overview
The ZS8100-NH3 uses tunable diode laser absorption spectroscopy for low-ppm ammonia measurement at SCR/SNCR catalyst outlets. The selected range, optical path, purge arrangement and sample handling are matched to the application before quotation.
- TDLAS optical NH₃ measurement for low-ppm ammonia-slip duty
- In-situ cross-duct option (no sample conditioning)
- Purge air system for high-dust environments
- Heated extractive option for retrofit installations
- Auto-validation with internal NH₃ reference cell
- Direct SCR/SNCR feedback for closed-loop NOₓ control
- TDLAS NH₃ capability is also available in a wall-mounted/in-situ TDLAS form factor by project review — same physics family, different form factor
Full Technical Specifications
Key Performance
| Metric | Value | Status |
|---|---|---|
| Range | Configured for the required NH₃ duty | quotation confirmation |
| Range Extension | Reviewed against concentration, temperature and matrix | quotation confirmation |
| Accuracy | Confirmed for the selected range and gas matrix | quotation confirmation |
| Response | Confirmed for the optical path and sample arrangement | quotation confirmation |
| Outputs | Analog and digital I/O configured for the control system | quotation confirmation |
Specifications
| Specification | Value |
|---|---|
| Range | Configured for the required NH₃ duty; confirmed at quotation |
| Accuracy | Confirmed for the selected range and gas matrix |
| Response | Confirmed for the optical path and sample arrangement |
| Output | Analog and digital I/O configured for the control system |
Deployment Environments
Common process environments where this model is evaluated.
Certification Scope
Standards are listed with scope and status so engineering review can verify the applicable enclosure, area, and safety case.
| Standard | Scope | Variant | Status | Document |
|---|---|---|---|---|
| CE | Declaration scope and applicable directives are confirmed for the supplied configuration | Project variant | project confirmation | On request |
| ATEX | Hazardous-area availability and final zone scope are confirmed for the supplied enclosure | Project variant | project confirmation | On request |
| CEMS / stack reporting package | Application-listed duty; method and reporting scope confirmed per project | Project variant | conditional | On request |
Documentation
Download the technical datasheet for this model, with application-note evidence for engineering review.
Evidence Notes
SCR/SNCR ammonia-slip monitoring architecture
Low-ppm NH₃ slip is measured on the SCR/SNCR outlet path with TDLAS line selection, purge protection, and optional heated extractive handling so the analyzer signal can feed dosing review without relying on delayed manual sampling.
Technical & Engineering Details
Secondary engineering detail — expand each topic for the full measurement, envelope, sample-system, calibration, and maintenance information.
01 Measurement Principle and Limits
How the measurement is bounded
TDLAS locks onto an NH₃ absorption line for low-ppm ammonia-slip measurement at SCR/SNCR catalyst outlets.
Rejects
- Broad-band gas fitting where NH₃ is inferred from multiple overlapping gas channels
Requires
- Stable optical path
- Purge air for high-dust ducts
- Heated extractive path when a retrofit loop is used
- Application matrix review for wet-stack duty
Interferents and Limits
- H₂O, CO₂, and SO₂ spectral background require line-selection and matrix review rather than a blanket rejection claim
- High-dust ducts require purge design
- Wet-stack or cold extractive runs require heated sample handling
- Higher-concentration NH₃ duty requires a range and matrix review
02 Operating Envelope
Use these limits as selection inputs, then confirm sample condition, ambient exposure, and materials before quotation.
- Cold extractive lines where NH₃ adsorption cannot be controlled
- Unreviewed wet-stack matrix at SCR/SNCR outlet
03 Sample System Boundary
Sampling mode, conditioning components, and exclusions define where the analyzer responsibility ends and the sample system begins.
- Cross-duct optical path
- Purge air system
- Optional heated extractive retrofit path
- Internal NH₃ reference cell
- Unheated extractive line for low-ppm NH₃ slip duty
04 Calibration & Validation site-specific
Calibration method, interval, and traceability requirements for this analyzer.
Zero / Span Method
Auto-validation with internal NH₃ reference cell
Interval
Site-specific
- SCR/SNCR ammonia-slip monitoring
- Stack emission reporting support when project documentation requires it
05 Maintenance & Spares site-specific
Routine service tasks, consumables, and access requirements for this analyzer; exact intervals are site-specific.
- Inspect purge-air path
- Check optical alignment
- Verify heated extractive path when fitted
- Run NH₃ reference-cell validation
- Purge air filtration elements where fitted
Frequently Asked Questions
What NH₃ range does the ZS8100-NH3 cover, and how does TDLAS measure ammonia slip?
The ZS8100-NH3 is configured around the required ammonia-slip range, duct conditions and gas matrix. Final range, accuracy and response are stated in the project datasheet and quotation. It uses tunable diode laser absorption spectroscopy (TDLAS), which locks onto an NH₃ absorption line for low-ppm measurement at SCR/SNCR catalyst outlets.
What does the TDLAS measurement require to perform reliably on an SCR/SNCR outlet?
The measurement requires a stable optical path, purge air for high-dust ducts, a heated extractive path when a retrofit loop is used, and an application-matrix review for wet-stack duty. H₂O, CO₂ and SO₂ spectral background is handled through line selection and matrix review rather than a blanket rejection claim. Higher-concentration NH₃ duty requires a separate range and matrix review.
In-situ or extractive — what sample-system options are available, and what is excluded?
The default sampling mode is in-situ, built around a cross-duct optical path, a purge air system, an optional heated extractive retrofit path, and an internal NH₃ reference cell. High-dust environments are supported with purge air once the purge design is confirmed per duct loading. Excluded configurations are an unheated extractive line for low-ppm NH₃ slip duty, cold extractive lines where NH₃ adsorption cannot be controlled, and an unreviewed wet-stack matrix at the SCR/SNCR outlet. Compatible conditioning systems are referenced as the ZS-SCS-400 and ZS-SCS-600.
How is the ZS8100-NH3 calibrated and validated in service?
Zero/span validation uses auto-validation with the internal NH₃ reference cell; the interval is site-specific. Routine maintenance covers inspecting the purge-air path, checking optical alignment, verifying the heated extractive path when fitted, and running the NH₃ reference-cell validation, with purge-air filtration elements as the only consumable where fitted. The calibration approach supports SCR/SNCR ammonia-slip monitoring and stack-emission reporting where project documentation requires it.
Which certifications apply to the ZS8100-NH3, and where is a CEMS/stack-reporting scope confirmed?
CE documentation, hazardous-area availability and any CEMS or stack-reporting scope are confirmed for the supplied configuration. The applicable enclosure, zone, method and reporting package are not asserted as blanket certifications. For SCR/SNCR architecture, low-ppm NH₃ slip is measured on the catalyst-outlet path with TDLAS line selection, purge protection and optional heated extractive handling.
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