Online Moisture Analyzer
Compact TDLAS moisture analyzer for continuous online monitoring
- Range
- 0–1000 ppm H₂O
- Accuracy
- ±2 ppm or ±2% of reading
- Response
- <5s T90
- Output
- 4-20mA, RS-485 Modbus
Overview
The GS8501-H2O is a compact, panel-mount TDLAS moisture analyzer designed for continuous online monitoring in compressed air, instrument gas, and process drying applications with built-in sample conditioning.
- Compact panel-mount design (1/2 rack width)
- TDLAS optical sensor for online moisture measurement
- Built-in sample conditioning (filter + flow control)
- One-button auto-zero calibration
- Low sample flow requirement (<0.5 L/min)
- 4.3″ color display with trend logging
- TDLAS H₂O capability is shared with the brochure ZS8500 bench-top platform and ZS8200 OEM laser module — same physics, different form factors
Full Technical Specifications
Key Performance
| Metric | Value | Status |
|---|---|---|
| Range | 0-1000 ppm H2O | confirmed |
| Accuracy | ±2 ppm or ±2% of reading | confirmed |
| Response | <5s T90 | confirmed |
| Output | 4-20mA, RS-485 Modbus | confirmed |
| Sample flow | <0.5L/min | confirmed |
Specifications
| Specification | Value |
|---|---|
| Range | 0–1000 ppm H₂O |
| Accuracy | ±2 ppm or ±2% of reading |
| Response | <5s T90 |
| Output | 4-20mA, RS-485 Modbus |
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 | Status |
|---|---|---|
| CE | Approval listed in v1 certification badges | approved |
Request Documentation
Request technical datasheets, certificates, and application notes for this model.
Evidence Note
Compact TDLAS moisture monitoring for utility and process drying
The v1 application set focuses on compressed air, instrument gas, plastics drying, and pharmaceutical gas purity. The architecture uses compact TDLAS, built-in sample conditioning, low sample flow, and auto-zero checks for online moisture trending within the declared ppm range.
Technical & Engineering Details
Secondary engineering detail — expand each topic for the full measurement, envelope, sample-system, calibration and maintenance scope.
01 Measurement Principle and Limits
How the measurement is bounded
Compact TDLAS measures H2O absorption for continuous online moisture monitoring in compressed air, instrument gas, and process drying applications.
Requires
- Built-in filter and flow-control path kept clean for low-flow operation
- One-button auto-zero workflow for site verification
- Matrix review when CO2, CH4, or high moisture may overlap the selected absorption line
Interferents and Limits
- CO2 and CH4 spectral overlap can require matrix review
- High-moisture conditions above the 1000 ppm range can saturate the selected measurement span
- Condensate or particulate carryover can disturb the compact sample cell
- Moisture above the declared 0-1000 ppm H2O range
- Condensing or dirty gas beyond the built-in filter and flow-control assumptions
- Hazardous-area scope is not declared in v1 source data
02 Operating Envelope
Use these limits as selection inputs, then confirm sample condition, ambient exposure, and materials before quotation.
- Moisture above 1000 ppm without alternate range review
- Condensing gas or particulate carryover beyond the built-in sample-conditioning path
- Hazardous-area installation without separate certification review
03 Sample System Boundary
Sampling mode, conditioning components, and exclusions define where the analyzer responsibility ends and the sample system begins.
- built-in sample filter
- flow control
- compact TDLAS sample cell
- 4.3-inch trend display
- No external sampling-conditioning system is declared in v1 source data
04 Calibration & Validation site-specific
Calibration method, interval, traceability, and audit support are shown only when structured data is available.
Zero / Span Method
One-button auto-zero calibration is listed in v1 features
Interval
Not stated in v1 source data
05 Maintenance & Spares site-specific
Tasks, consumables, and access items are shown only when structured maintenance data is available.
- Inspect built-in filter and flow-control path for contamination
- Run one-button auto-zero checks according to the site QA schedule
- Review range selection before moving from compressed-air or instrument-gas service into wetter process duty
- Built-in sample filter or conditioning parts
Frequently Asked Questions
What does the GS8501-H2O measure, and how?
The GS8501-H2O is a compact TDLAS analyzer that measures H₂O absorption for continuous online moisture monitoring in compressed air, instrument gas, and process drying applications. The published range is 0–1000 ppm H₂O with ±2 ppm or ±2% of reading accuracy and a <5s T90 response.
What sample conditioning does the GS8501-H2O require?
It uses a built-in sample filter and flow-control path feeding a compact TDLAS sample cell, kept clean for low-flow operation at <0.5 L/min. No external sampling-conditioning system is declared in the v1 source data, so the built-in conditioning path defines the sample-system boundary.
Which gases or conditions can interfere with the moisture reading?
CO2 and CH4 spectral overlap can require a matrix review. High-moisture conditions above the 1000 ppm range can saturate the selected measurement span, and condensate or particulate carryover can disturb the compact sample cell.
What duty falls outside the GS8501-H2O operating envelope?
Outside the envelope: moisture above 1000 ppm without an alternate-range review; condensing gas or particulate carryover beyond the built-in sample-conditioning path; and hazardous-area installation without separate certification review. Instrument-gas dew-point verification is a listed application, but no numeric dew-point range is stated in the v1 source data.
How is the GS8501-H2O calibrated and validated?
One-button auto-zero calibration is listed in the feature set. The calibration interval is not stated in the v1 source data, so validation cadence is site-specific and should follow the site QA schedule.
What approvals does the GS8501-H2O carry?
CE approval is listed for this model. A hazardous-area rating is not declared in the v1 source data, so any classified-area installation requires a separate certification review.
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Send gas range, sample temperature, pressure, moisture, and certification needs before final model selection.