Environmental monitoring
Continuous monitoring of emissions, ambient air quality, water and effluent with data transmission to the regulator.
Sites
From the probe to the state platform
Continuous emission monitoring in the stack with data transmitted to the regulator. A rise in emissions is the first sign of a torn bag.
- Components: SO₂, NOₓ, CO, CO₂, O₂, PM, HCl
- Standards: EN 14181, USEPA
- Averaging 20 min / 1 h / 24 h
- Integration: Ecoonline.uz (Uzbekistan), ASM (Kazakhstan)
- Calibration: QAL2 / AST annually
For aggressive media and outdoor sites
- Probe: SS316L, titanium for aggressive media
- Heated PTFE line
- Sample conditioning cabinet with a chiller
- Analysers: NDIR, UV, FID, laser dust monitor
- Modbus RTU / TCP, OPC UA protocols
- IP54–IP65 cabinet, climate control
- Met mast: wind, temperature, humidity
- Cabin with climate control (AQMS)
CEMS technical data
| Parameter | Value |
|---|---|
| Components | SO₂, NOₓ, CO, CO₂, O₂, PM, HCl |
| Accuracy | ≤ ±1 – 2% FS |
| Response time | ≤ 60 s |
| Frequency | continuous; averaged over 20 min / 1 h / 24 h |
| Operating temperature | 0–50 °C (option −20…50) |
| Power supply | 220 V AC / 24 V DC |
| Protection | IP54 / IP65 |
| Interfaces | Ethernet, Modbus, 4G, OPC or Profibus |
| Integration | with DCS, SCADA or PLC |
| State platforms | Ecoonline.uz (Uzbekistan), ASM system (Kazakhstan) |
| Standards | USEPA 40 CFR 60/75, EN 14181, ISO 14956, QAL1/2/3 |
| Calibration | annual, QAL2 / AST |
CEMS configuration: from the probe to the state system
Data is available to both the operator and external systems: local HMI, archive, trends and alarm limits; industrial protocols and API/gateway; integration with a state or corporate platform once its technical interface is confirmed.
- 01Sampling probe
Representative sampling from the duct; back-purge and inlet filter.
- 02Heated line
Transports the sample to the analyser above dew point (120–180 °C).
- 03Sample conditioning
Gas cooler (Peltier) and 2 – 5 µm filter; a spare filter cuts downtime.
- 04Analyser and data processing
Gas analysers, dust monitor, PLC cabinet, archive and reports.
- 05Data transfer
Fibre / 4G / Ethernet; link to Ecoonline.uz or ASM with redundancy.
Oʻz MSt 195:2024: thresholds above which a CEMS station is mandatory, g/s
The standard defines at what emission levels a station is mandatory and what requirements it must meet. In force since 28 August 2024.
| Pollutant | Threshold, g/s |
|---|---|
| Particulates | 0.833 |
| Sulphur dioxide (SO₂) | 8.333 |
| Nitrogen oxides (NOx) | 8.333 |
| Carbon monoxide (combustion completeness indicator) | 1.388 |
| Carbon monoxide (other cases) | 27.777 |
| Hydrogen fluoride (HF) | 0.083 |
| Hydrogen chloride (HCl) | 0.417 |
| Hydrogen sulphide (H₂S) | 0.083 |
| Ammonia (NH₃) | 0.417 |
A station is also mandatory if any substance exceeds 60% of the total emission of all stationary sources. We determine which station your industry needs free of charge by comparing your emissions with the thresholds of the standard.
To Oʻz MSt 195:2024 (CEMS) and Oʻz MSt 194:2024 (AQMS)
Oʻz MSt 194:2024 has been in force since 28 August 2024 and is mandatory for impact categories I and II; developed in line with BS EN 14181, with data sent to the Unified geoinformation database in real time. Our AQMS stations are built to these requirements.
- Protection rating: CEMS — at least IP54, AQMS — at least IP55
- Response time (T90) — no more than 45 seconds
- Measurement frequency: CEMS — at least once a minute, AQMS — at least once every 180 seconds
- MTBF: CEMS — at least 24,000 hours, AQMS — at least 15,000 hours (P=0.95)
- Zero and span drift — ±2% of full scale per week
- Backup power — at least 4 hours
- Permitted annual downtime for maintenance — no more than 28 calendar days (CEMS)
- Data archive — at least 12 months (AQMS); transmission — 4G and GPRS, Wi-Fi for local setup
- AQMS operating range −40 °C to +60 °C, station weight 5–50 kg
- Service life: CEMS — at least 10 years, AQMS — at least 5 years; sensors — at least 2 years
- AQMS monitors: NO₂, SO₂, NH₃, CO, O₃, H₂S; PM2.5, PM10, total dust; met block
What monitoring delivers
- Proof of regulatory compliance
- Early detection of filter failure from rising emissions
- Automatic reporting without manual data collection
- Protection from fines during inspections
What not to expect
- It does not replace cleaning — it only measures
- Requires regular calibration and span gases
- Will not work without stable power and a data link
- The sampling point must meet the requirements of the standard
Monitoring questions
Can CEMS replace gas cleaning?
No — the station only measures. But it gives early diagnostics: a rise in emissions is the first sign of a torn bag, and a jump in the dust monitor reading means a bag has failed. The dust monitor is fitted after the filter, before the ID fan.
Why is sampling the weakest link?
80% of CEMS failures are the probe, the line and the sample filter. A line below dew point loses SO₂ and HCl, so it is heated to 120–180 °C. Back-purging extends the service interval and a spare filter cuts downtime.
How is the analyser range chosen?
From the actual emissions, not «with margin»: ranges from 0–50 to 0–5,000 mg/Nm³, accuracy ±2% of full scale, response under 60 s. A stock of calibration gases is required; calibration uses span gases and auto-zero.
What happens to the data when the link drops?
Without a stable link the regulator does not accept the data, so the link is duplicated and a local archive (at least 3 years) keeps the measurements during the outage. The cabinet has a UPS and lightning protection.
Why does AQMS need a weather station?
Without met data the AQMS results cannot be tied to an emission source. The mast height is set by the method statement (2 / 10 m) and sensors are heated against icing. The station shows your site’s own contribution and works in tandem with CEMS.
How often is calibration required?
Annually, under the QAL2 / AST procedures. The standard allows zero and span drift of no more than ±2% of full scale per week, so regular span and calibration gases are needed.
What data is needed for a water and effluent monitoring station?
Water analysis, ranges, installation point, sampling conditions, communications and reporting requirements. Integration with a state or corporate platform follows once its technical interface is confirmed.
CEMS and AQMS stations in 3D
Standards and guides
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