- Model Sentry-MS - Open Path Multi-Gas Analyzers

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The Cerex UV Sentry Open Path Multi-gas Analyzer sets the industry standard for time-resolved, gap-less fugitive emissions and chemical emergency monitoring across fencelines, around process units and around tank farms.

The most cost effective perimeter & fenceline monitoring solution…

Multi-gas monitoring over linear distances exceeding 1000 meters, minimal infrastructure requirements and direct integration with existing factory management systems provide cost effective installation. Low consumables, field proven service life, inherent calibration and “hands off” operation provide low cost of ownership.



Offers part per trillion real time detection limits for early warning of fugitive emissions…

Part per trillion to low part per billion detection limits and wide dynamic ranges enhance early leak detection and release characterization. Concentrations of gases below the detection thresholds of traditional sensor arrays are readily detectable with the UV Sentry analyzer. Early detection translates into quicker response times, reduced environmental impact, decreased plant downtime and reduced exposure of site personnel and the community.

Of individual species of prolific hazardous air pollutants…

UV Sentry analyzers quantify individual species of toxic gases within complex mixtures using standard CLS analysis coupled with proprietary real time spectral analysis routines. Monitoring performance is immune to interference from water vapor and the UV Sentry analyzer cannot be poisoned. Typical accuracy and precision are 2.5% and 3.0% of reading respectively. Species include gases commonly of concern in Chemical Manufacturing, Refinery Operations, Acid Plant Operations and Ore Processing, Concrete Manufacturing, Mining Operations, Environmental Remediation and More…

With seamless integration into SAFER Systems chemical emergency management software...

For facilities using SAFER Systems’ emergency response software the UV Sentry analyzer integrates seamlessly. SAFER’s patented software is used in conjunction with Cerex hardware in several different ways; pre-emergency for preparation and training, during an emergency for emergency response, and post-emergency for future event mitigation, regulatory reporting, and litigation response. The complete solution utilizes live streaming data from on-site weather stations and Cerex gas detection sensors to generate a visualized model of the chemical plumes or soot clouds released during an emergency. The models automatically update as weather/sensor data changes so that emergency response teams know who or what will be impacted by the emergency (whether on-site or off-site), who needs to be evacuated or shelter in place, and how long the event will last. In the case of highly flammable chemicals, the models show where the combustion particulates will be deposited as well as the chemical composition of the soot clouds. All of the models and data are archived so they can be used for post-emergency analysis of the event, in response to odor complaints and litigation, and for reporting to regulatory agencies when needed. Not only can response teams use pre-defined scenarios prior to an emergency, but they can also use the archived data and models to base their emergency drills and training on actual events that may have occurred.

The Sentry-MS offers perimeter monitoring with among the lowest cost per meter monitored of any modern gas analysis system. A single analyzer is capable of monitoring more than one kilometer of fenceline. Gapless perimeter monitoring not possible with point sensor technology is the norm, and long life low maintenance design ensures continued value for monitoring investments.

  • Direct SAFER Systems Integration
  • MODBUS TCP Integration
  • VNC Remote Control
  • Part per Trillion Sensitivity
  • Automated Reporting
  • Automated Alarms
  • Simple .csv or .txt Data Logging
  • Easily configured for your application
  • Tripod mount or fixed installation
  • Optional Hazardous Location Hardware

Multi-Compound Detection Capabilities
Offering real time quantification of multiple compounds, the Cerex Sentry-MS provides dramatic cost savings in perimeter monitoring applications. One analyzer is capable of monitoring linear path lengths in excess of 1000 meters, while reliably delivering accurate data without reporting inflated concentrations due to interferent background gases. The Sentry-MS is offered fully configured to meet the requirements of your air quality monitoring application. Target gases are selected from Cerex’s library of UV compounds. Changing target gases incurs no additional costs and is simple as copying and pasting.

Low Maintenance Costs, Increased Uptime
The Sentry-MS is designed for fully autonomous continuous operation. Inherent calibration eliminates the need for time consuming and expensive routine calibration. Quality assurance audits require only small quantities of primary standard gas. Synthetic background implementation zeros the analyzer each acquisition cycle without concern for background gas concentrations. The UV source is the only consumable, and carries a 2000 hour manufacturer half-life warranty. Optical surfaces are sealed and may be cleaned as necessary with household cleaner.

Low Cost Installation and Integration
For many installations complete perimeter monitoring may be achieved with only two power and communication installation locations. MODBUS TCP and VNC via Ethernet are standard communication and remote control protocols.

Enhanced Early Detection Performance
Part per trillion to low part per billion detection limits and wide dynamic ranges enhance early leak detection and release characterization. Concentrations of gases below the detection thresholds of traditional sensor arrays are readily detectable with the Sentry-MS and without interference from common background gases or water vapor. Early detection translates into quicker response times, reduced environmental impact, decreased plant downtime and reduced exposure. The analyzer likewise cannot be poisoned, and even after exposure to high concentrations of gas, clear down is immediate.

Direct Integration with SAFER Systems Modeling
The Sentry-MS seamlessly integrates with SAFER Systems’ emergency response software. SAFER’s patented software is used in conjunction with Cerex hardware in several different ways; pre-emergency for preparation and training, during an emergency for emergency response, and post-emergency for future event mitigation, regulatory reporting, and litigation response. The complete solution utilizes live streaming data from onsite weather stations and Cerex gas detection sensors to generate a visualized model of the chemical plumes or soot clouds released during an emergency. The models automatically update as weather/sensor data changes so that emergency response teams know who or what will be impacted by the emergency (whether on-site or off-site), who needs to be evacuated or shelter in place, and how long the event will last. In the case of highly flammable chemicals, the models show where the combustion particulates will be deposited as well as the chemical composition of the soot clouds. All of the models and data are archived so they can be used for post-emergency analysis of the event, in response to odor complaints and litigation, and for reporting to regulatory agencies when needed. Not only can response teams use pre-defined scenarios prior to an emergency, but they can also use the archived data and models to base their emergency drills and training on actual events that may have occurred.

Core Data Acquisition and Integrated Meteorological Monitoring
With optional inputs the Sentry-MS may be configured to acquire and integrate data from ancillary analyzers and meteorological monitoring hardware to offer definitive records of site conditions.

Open Path UVDOAS Principle of Operation
The Cerex Sentry-MS operates by sending a beam of UV light through the open air. The UV beam is reflected back to the analyzer by a retro-reflector array (mono-static), where the absorption due to target gases is measured and recorded. The analyzer uses a classical least squares regression analysis to compare the measured absorption spectrum to calibrated reference absorption spectra files. Beer’s Law is used to report accurate gas concentrations.

Mono-static Design and Installation
The Sentry-MS mounts to a precision pan and tilt head which may be used with a tripod for rapid deployment, or with a fixed mount for permanent installations. The retro-reflector array is housed in a protective enclosure and may be tripod or fixed mounted to a mast, pole or superstructure. Power and overhead shelter are required on at the analyzer end of the monitoring path. Maximum path length depends upon the UV source chosen for the analyzer and the target gases. For the deuterium source maximum path length is approximately 225 meters, for a Xenon source path lengths in excess of 1 Km are possible.

Sentry-MS Features
Software and hardware features are specifically designed to simplify integration , automate operation and reduce maintenance. Tedious calibrations are unnecessary and the use of synthetic background functionality allows continuous and accurate quantification of gases that are always present without the need for complex background acquisition procedures.

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  • Simultaneous multi-gas detection capabilities
  • Integrated Computer with Windows®
  • Part per billion minimum detection limits (gas specific)
  • User configurable alarms and data acquisition rate
  • Inherent calibration: No need for ongoing calibrations
  • Integrated WiFi , LAN, USB
  • Automated background acquisition
  • MOBUS TCP and Ethernet VNC Networking
  • Automated synthetic background implementation
  • Integrated instrument air conditioning

  • Integrated Meteorological Monitoring
  • Internal Flow Through QA Cell
  • Analog inputs, integrated data logging
  • External QA Cell
  • Collocated Particulate Monitoring
  • Extended Temperature Range
  • Modbus RTU, 4-20mA, 0-5VDC
  • Alarm driven control outputs
  • RS-232, 422, 485 output
  • HAZLOC Z-Purge, Air Conditioning
  • USB Cellular Modem or RF Modem
  • Intermediate Mirror

Analyzer: UV Sentry

  • Application: Open Path Mono-static Multi-Gas Analyzer
  • Bulb Life: 2000 Hour Half-Life Warranty (Xenon and Deuterium)
  • Operating Temperature: 0 to +40ºC (extended ranges optional)
  • Power: 120 or 220 VAC,6 A
  • Operating Humidity: 0-100%
  • Power: 120 or 240VAC, 100W (DC Optional)
  • Enclosure: Steel, Aluminum
  • Weight: 53 Lbs.
  • Dimensions: 29 x 13.3 x 12.3 (in)
  • Mounting: Pan and Tilt Head via Dovetail
  • Dynamic Range: Application Specific
  • Background Drift (TYP): Not Applicable
  • Linearity Drift (TYP): < 2%, Self-Compensating
  • Accuracy / Precision: > 5% Reading / 5% Reading TYP
  • Technology: UVDOAS
  • UV Source: Application Specific: Deuterium or Xenon
  • Data Output:
    • .CSV via Ethernet and WiFi, ASCII via MODBUS TCP/IP
    • Data Output Options: RS-232, 422, 485, RF Stream, MODBUS RTU,
  • MODBUS TCP/IP, Email, 4-20mA, 0-5VDC
  • Networking: LAN, WAN and USB Ports, optional cellular modem, optional radio modem

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