Testing & Monitoring
Online Monitoring Systems (OCEMS)
Real-time stack and effluent monitoring that keeps transmitting accurate data to the regulators, without false alarms.
Quick answer
Highly polluting industries and units directed by CPCB or MPCB must install online continuous emission (CEMS) and effluent (CEQMS) monitoring systems that transmit live data to the CPCB and MPCB servers. Correct analyser selection, installation, calibration and data connectivity are essential to avoid data gaps and false exceedance alerts.
Reviewed by the Aaradhya Enviro compliance team · 18 October 2026
Overview
Highly polluting industries and other units directed by CPCB or MPCB must install online continuous emission monitoring systems (CEMS) on their stacks and continuous effluent quality monitoring systems (CEQMS) at their treatment plant outlets, with data transmitted live to the CPCB and MPCB servers. Data gaps and readings that exceed limits trigger automatic alerts and can lead to action.
We help you select analysers suitable for your parameters and conditions, plan their installation, connect the data acquisition system to the regulator servers, and set up calibration and maintenance routines. We also troubleshoot connectivity problems, drift and false exceedances, which are the most common complaints with existing systems.
Who needs this service
- Industries in categories directed to install online monitoring
- Units with an online monitoring condition in their consent
- Plants with existing systems showing data gaps or false exceedances
- Common treatment facilities and large STPs
What we cover
Requirement study
Parameters, locations and data connectivity requirements for your unit.
Analyser selection
PM, SO₂, NOx, flow, pH, BOD, COD, TSS and other analysers.
Installation support
Mounting, sampling systems, shelters and power backup.
Data connectivity
Data logger configuration and connection to CPCB / MPCB servers.
Calibration & QA
Calibration schedules, comparison with manual sampling and records.
Display boards
Digital display boards at the gate where required.
Our process
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Step 1
Assessment
Which parameters and points need online monitoring.
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Step 2
Specification
Analyser and data logger specifications.
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Step 3
Installation
Installation and commissioning support.
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Step 4
Connectivity
Server connection and data verification.
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Step 5
Calibration
Initial calibration and validation.
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Step 6
Upkeep
Periodic calibration, maintenance and troubleshooting.
What you receive
- Requirement and specification note
- Installation and connectivity report
- Calibration certificates and records
- Maintenance schedule
- Troubleshooting log
Applicable regulations
- CPCB directions on online continuous monitoring
- Online monitoring conditions in your MPCB consent
Regulations are amended from time to time; we always work to the version currently in force and the conditions in your own consent.
FAQ
Online Monitoring Systems (OCEMS): frequently asked questions
Who has to install online monitoring systems?
Why does our system show false exceedances?
How often should analysers be calibrated?
Related services
Air, Water & Soil Testing
Stack, ambient air, effluent, drinking water and soil testing with compliance interpretation.
Learn moreAir Pollution Control Systems
Wet scrubbers, bag filters, cyclones, stacks and ducting to meet emission limits.
Learn moreETP & STP Design and Installation
Turnkey Effluent and Sewage Treatment Plants: design, supply, installation, commissioning and handover.
Learn moreOperation & Maintenance (O&M)
Trained operators, daily logs, testing and preventive maintenance for ETP, STP, RO and ZLD plants.
Learn moreFurther reading
Discuss Online Monitoring Systems (OCEMS) with our team
Share your requirement and get a clear scope, timeline and estimate.