SENTRY-MS Mono-static Multi-gas Open Path Analyzer Air Monitoring Where You Need it... The Cerex Sentry-MS Multi-gas Open Path Analyzer is specifically designed for rapid deployment for a variety of indoor and outdoor open path monitoring applications. Like all Cerex analyzers the Sentry MS is capable of continuous, long-term unattended monitoring. Multi-Gas Analysis Part per Trillion Sensitivity Integrated Networking Automated Reporting Automated Alarms Simple.csv Data Logging Cannot be Poisoned Easily configured for your application CONTACT: 1816 Briarwood Industrial Court, Suite D Cerex Sentry Analyzer with optional Vortex cooling and sealed stainless steel enclosure for Mercury and SO2 monitoring....when You Need It, How You Need It.
Sentry-MS Features The Cerex Sentry-MS is an autonomous multi-gas analyzer with features defined by end-users in industrial, scientific and environmental remediation installations worldwide. We will be happy to demonstrate the detection capacity and features in real time, via the Internet. Simply contact us to schedule a demonstration. Integrated Computer with Windows Inherent calibration: No need for ongoing calibrations Integrated WiFi / LAN User configurable, multiple, staged alarms Automated data reporting User configurable acquisition cycles External WAN, LAN and USB Ports User configurable automated background acquisition.csv data file output Simplified remote access Simultaneous multi-gas detection capabilities Part per trillion minimum detection limits Common Options Consumables The Sentry-MS may be ordered with options to provide flexibility to meet project specific monitoring goals. Integrated Meteorological Monitoring Internal Flow Through QA Cell Analog inputs, integrated data logging External Flow Through QA Cell Collocated particulate data integration Stainless Steel NEMA Enclosure MODBUS, RS-232, 422, 485 output Extended Temperature Range 4-20mA, 0-5VDC output Alarm driven control outputs RF Modem DC Power USB Cellular Modem HAZLOC Z-Purge Cellular Modem provides remote access to user interface, data and alarms via any computer or smartphone with Internet access. The Sentry-MS is designed to minimize operational costs and maximize uptime. Only two consumable items: The UV source and air intake filter. Both are field replaceable in under fifteen minutes. UV sources are warranted for 2000 hours of half-life. Actual lifetime typically exceeds 3000 hours. Stainless steel Sentry-MS and extended range Retroreflector array. Gear driven pan and tilt heads and tripod mounts make deployment simple and fast. Power is only required at one end of the monitoring path. CONTACT: 1816 Briarwood Industrial Court, Suite D Windows is a registered trademark of Microsoft Corporation in the United States and many other countries.
Cerex CMS Software All Cerex analyzers use Continuous Monitoring Software. CMS provides the user interface, data-logging and analytic gas detection and quantification functionality. Target gas concentrations and alarm parameters are reported each user configured acquisition cycle. Running in user-familiar Windows on the integrated computer, CMS controls are as intuitive as operating a personal computer or smartphone. Installing the Sentry-MS with internet access, or adding an optional cellular modem adds powerful realtime remote control and data access functionality. Alarms may be automatically emailed to any email address when gas concentrations exceed user-configurable alarm thresholds, and data may be automatically emailed daily. For local operation the Sentry-MS is equipped with integrated WiFi. Simply use a common VNC utility for access to CMS, data and instrument status. The CMS Data tab displays per acquisition gas concentration, data validity and visual alarms. Trended concentration data is available at a glance on the CMS Data Summary tab. The instantaneous single beam plot of the UV tab is used for aligning the analyzer and retro-reflector. Not Just For Perimeter Ambient Air Monitoring REFINERY Benzene, Toluene, Ethyl-benzene and Xylene monitoring across tank farms, pipelines, and process units. CHEMICAL MANUFACTURING Chlorine monitoring across process ventilation systems. FOUNDRY OPERATIONS Mercury and Sulfur Dioxide monitoring near smelting processes. MINING Carbon Disulfide monitoring at mining operation sites. WATER TREATMENT Chlorine and Ammonia monitoring at water treatment facilities ENVIRONMENTAL REMEDIATION Naphthalene and BTEX monitoring at remediation sites. Integrated particulate and meteorological monitoring. MOBILE AIR QUALITY LAB Formaldehyde, SO2, BTEX, NO, NO2, Acetaldehyde and 1,3 Butadiene monitoring in response to odor complaints.
info@cerexms.com CEREX Sentry-MS Open Path Multi-Gas Analyzer Minimal maintenance The only consumables are the UV source and intake filter. Cannot be poisoned Individual gas species detection Data and alarms can automatically be sent to email addresses, website or control room. Analog outputs available 4-20mA, 0-5 VDC MODBUS available RTU, TCP/IP Inherent calibration No ongoing calibration required User-configurable autobackground functionality Analyzer Application Maintenance Bulb Life Filter Life Installation Operating Temperature Cooling Operating Humidity Power Enclosure Weight Dimensions Mounting Performance Dynamic Range Background Drift (TYP) Linearity Drift (TYP) Accuracy Technology UV Source Data Output Data Output Options Alarms User Configurable Networking Sentry MS Open Path Mono-static Multi-Gas Analyzer 2000 Hour Half-Life Warranty (Xenon and Deuterium) Replace as needed 0 to +50ºC (extended ranges optional) Instrument AC 0-100% TYP 120 or 240VAC, 100W (DC Optional) Thermoplastic or Stainless Steel NEMA 4X 37 55 Lbs. 16 x 16.9 x 12.3 (in) Pan and Tilt Head via Dovetail Application Specific < 2% FS / 24hr, Self-Compensating < 2%, Self-Compensating Application Specific UVDOAS Application Specific: Deuterium or Xenon.CSV native via Ethernet and WiFi RS-232, 422, 485, RF Stream, MODBUS RTU, MODBUS TCP/IP, Email, 4-20mA, 0-5VDC Fully configurable concentration and TLV averaged concentration alarm functionality Sealed LAN, WAN and USB Ports, optional cellular modem, optional radio modem Dimensions: Left: Retro-reflector Cube Below: Sentry-MS with optional stainless steel enclosure CONTACT: 1816 Briarwood Industrial Court, Suite D
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 cube (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 per USEPA TO-16 Methodology. Beer s Law is used to report accurate gas concentrations. Mono-static Design and Installation The Sentry-MS is a mono-static design and may be installed and collecting data in minutes to allow rapid response to odor complaints, for toxic spill, leakage and release monitoring, plume dispersion modeling, IAQ characterization, community and work site hazard mitigation, and more. The use of a retro-reflector results in the UV beam passing through the same air twice. This creates a sample path twice the separation distance between the analyzer and retro-reflector. The double-pass allows low minimum detection limits at relatively small separation distances between the analyzer and retro-reflector. Appx. 1000 meters max for Xenon Appx. 225 meters max for Deuterium Sentry MS Analyzer (Transceiver) uses a pan and tilt head for tripod or fixed mounting. Power is required only at this end. UV Source Options The Sentry-MS is available with either a Deuterium or Xenon UV source. The advantage of Deuterium is high sensitivity to a larger set of detectable gases. The advantage of Xenon is long distance monitoring. Detection Capabilities The Cerex Sentry-MS is a multi-gas analyzer. Available with our standard gas reference files (Table on right), or with application specific reference files to accommodate the minimum detection limit requirements of the exact monitoring installation. Individual gas species or aggregate concentrations may be reported at your specified MDL. To determine the Path Averaged MDLs for a particular installation using the standard Cerex library, divide the Path Integrated Minimum detection Limit (PPMm) value (Table on Right) by the sample path length in meters (twice the distance between the analyzer and retro-reflector). See Table on next Page. Retro-reflector offers simple alignment and reliable performance. Sentry-MS Single Gas Minimum Detection Limits for Deuterium and Xenon Sources Path Integrated MDL (PPM-m) Compound Xenon Source Deuterium Source Ammonia (NH 3 ) 0.6* 0.20 Acetaldehyde (C 2 H 4 O) 3.20 3.00 1,3 Butadiene (C 4 H 6 ) Non-detect 0.20 Benzene (C 6 H 6 ) 0.27 0.27 Carbon Disulfide (CS 2 ) 13.31 13.31 Chlorine (Cl 2 ) 5.00 5.00 Ethylbenzene (C 6 H 5 CH 2 CH 3 ) 0.30 0.30 Formaldehyde (CH 2 O) 3.20 3.20 Mercury (Hg) 0.00002 0.00002 Naphthalene (C 10 H 8 ) 0.20 0.20 Nitrogen Oxide (NO) 0.29* 0.29 Nitrogen Dioxide (NO 2 ) 3.04* 3.04 Ozone (O 3 ) 2.00 2.00 Phenol (C 6 H 5 OH) 0.30 0.30 Styrene (C 8 H 8 ) 0.60 0.60 Sulfur Dioxide (SO 2 ) 0.68 0.32 Toluene (C 7 H 8 ) 0.84 0.84 m-xylene (C 8 H 10 ) 0.35 0.35 o-xylene (C 8 H 10 ) 3.77 3.77 p-xylene (C 8 H 10 ) 0.24 0.24 *Detection requires limited path lengths and/or high acquisition times.
CONTACT: 1816 Briarwood Industrial Court, Suite D Detectable Compounds and Typical Detection Performance of the Cerex Standard Gas Library In this example installation, the Sentry-MS and retro-reflector are separated by 150 meters to create a 300 meter sample path. The table below specifies the minimum detection limits when using the Cerex standard reference library. For specialized, application specific detection ranges contact us. 150 meters between the Sentry-MS and Retroreflector creates a 300 meter sample path. Currently there are a number of definitions of detection limits used to characterize the performance of air monitoring systems. A common definition of is the magnitude of the absorbance spectra that is twice the system noise. The U.S. Environmental Protection Agency s Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air - Second Edition Compendium Method TO-16 Long-Path Open-Path Fourier Transform Infrared Monitoring Of Atmospheric Gases defines detection limits as the following: The detection limit of the Sentry-MS system is a dynamic quantity that will change as the atmospheric conditions change. The variability of the target gas, and all of the other interfering species concentrations contributes to the variability of this measurement. The detection limit as determined in this procedure is the result of a calculation using a set of 15 individual absorption spectra. The 16 individual single beam spectra used for this determination are acquired in 5-min intervals and no time is allowed to elapse between them. The absorption spectra are then created by using the first and the second single beam spectra, the second and the third, and the third and the fourth, and so on until the 15 absorption spectra are obtained. These absorption spectra are analyzed in exactly the same way that all field spectra are to be analyzed and over the same wave number region. The analysis should result in a set of numbers that are very close to zero because most of the effects of the gas variability have been removed. The numerical results should be both positive and negative and for a very large set of data should average to zero. Three times the standard deviation of this calculated set of concentrations is defined to be the detection limit. Although Method TO-16 was written for open path FTIR, the Cerex Sentry-MS system is unique among UV systems in that the raw data is essentially identical to an FTIR Single beam file. Hence the direct correlation drawn to TO-16. Using the detection limit definition described in TO-16, CEREX developed the detection limits that are listed here, however it should be noted that the actual detection limits achieved in the field will vary. This is primarily due to the fact that variations in interfering species will result in variability in detection limits. Cerex considers the detection limits listed to be a very conservative estimate. The end-user of the equipment will likely achieve much better results in the field. Cerex believes it is a good policy to not oversell a capability to our potential customers. Sentry-MS Single Gas Minimum Detection Limits: Deuterium Source Compound Path Integrated MDL Path Averaged MDL (PPM-m) 300 Meter Path (PPB) 1,3 Butadiene 0.2 0.7 Acetaldehyde 3 10.0 Ammonia 0.2 0.7 Benzene 0.267 0.9 Carbon Disulfide 13.31 44.4 Chlorine 5 16.7 Ethyl Benzene 0.3 1.0 Formaldehyde 3.2 10.7 Mercury 0.00002 0.00007 m-xylene 0.35 1.2 Naphthalene 0.2 0.7 Nitrogen Dioxide 3.04 10.1 Nitrogen Oxide 0.292 1.0 o-xylene 3.77 12.6 Ozone 2 6.7 Phenol 0.3 1.0 p-xylene 0.237 0.8 Styrene 0.6 2.0 Sulfur Dioxide 0.32 1.1 Toluene 0.838 2.8