LumaSense Technologies, Inc.

- Model 1512 - Photoacoustic Multi-Gas Monitor

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The LumaSense Photoacoustic Gas Monitor INNOVA 1512 is based on the photoacoustic infrared spectroscopy and delivers superior sensitivity in a very compact form factor. Extremely versatile by design, the 1512 is capable of measuring almost any gas that absorbs infrared light.

Accuracy of these measurements is ensured by the 1512’s ability to compensate for temperature and pressure fluctuations, water vapor interference, and interference from other gases known to be present.

Reliability of measurement results can be ensured by regular self tests. This measurement system requires no consumables and very little regular maintenance. For most applications, recalibration is only necessary one to two times a year.

The monitoring system is easily operated through either the front panel, with its push-buttons and display providing short explanatory texts, or through the PC software.

Both interfaces allow the user to configure the monitor, start a measurement sequence, and view the resulting concentration values of specific gases.

The monitor is equipped with standard interfaces: USB, Ethernet, and RS232. These enable the monitor to be integrated into automated process systems.

The 1512 has a built-in pump system that allows samples to be drawn from up to 50 meters away.

Example of Applications

  • Occupational Health and Safety measurements – of possible production or accumulation of toxic/ carcinogenic substances in working areas
  • Monitoring of anesthetic agents in hospitals
  • Emission monitoring of greenhouse gases from agricultural production
  • Emission monitoring of exhaust from chemical processes
  • Indoor Air Quality (IAQ) measurements
  • Ventilation and air exchange using tracer gas

Key Features

Our product design leverages the unique strengths of the photoacoustic sensor technique and has consistently delivered the following high value features that make our differentiation:

  • Selectively measures a wide range of gases/vapors
  • Linear response over a wide dynamic range
  • Stable and Reliable: ensuring a maximum of only two calibrations a year
  • User-friendly: easy calibration, configuration, and viewing/analyzing of data via PC
  • Accurate: compensates for temperature and pressure fluctuations, water vapor interference, and interference from other known gases
  • Extremely low-volume flushing possible
  • Operates immediately: virtually no warm-up time necessary
  • Remote control capability via TCP/IP network interface protocol
  • Expandable up to 24 locations with INNOVA 1409 Multipoint Sampler: the Gas Monitor can operate as the system controller for full standalone operation
  • Includes BZ7002 Calibration Software
  • Includes BZ7003 Offline Software to set up the Gas Monitor without connecting it to a PC and to download data stored in the gas monitors internal memories.

Gas Detection Limits

Gas selectivity is achieved through the use of optical filters. By installing up to five filters, the 1512 can measure the concentration of up to five component gases and water vapor in any air sample. The detection limit is gas-dependent, but is typically in the ppb region.

The Photoacoustic Field Gas-Monitor – INNOVA 1412 is a highly accurate, reliable and stable quantitative gas monitoring system. It uses a measurement system based on the photoacoustic infrared detection method, and is capable of measuring almost any gas that absorbs infrared light.

Gas selectivity is achieved through the use of optical filters. By installing up to five of these filters in the 1412, it can measure the concentration of up to five component gases and water vapor in any air sample. Although the detection limit is gas-dependent, it is typically in the ppb region. The accuracy of these measurements is ensured by the 1412’s ability to compensate for temperature and pressure fluctuations, water vapor interference and interference from other gases known to be present. Reliability of measurement results is ensured by regular self tests, which the 1412 performs. By the nature of this measurement system, it requires no consumables and very little regular maintenance, for example, for most applications recalibration is only necessary one – two times a year.

The monitoring system is easily operated through either of the two user interfaces: the front panel with its push buttons and display providing short explanatory texts, or the PC Software, with its graphical interface. Both interfaces enable the monitor to be set-up, a measurement sequence started and the resulting concentration values of the specified gases viewed while monitoring.

The monitor is equipped with two standard interfaces: IEEE-488 and RS-232 (optional JV 0901 converter RS-232 to USB). These enable the monitor to be integrated into automated process systems. The 1412 has a built-in pump system that allows samples to be drawn from up to 50 m away.

Selectivity
The gas selectivity of the 1412 is determined by the optical filters installed in its filter wheel. Because water is nearly always present in ambient air and absorbs infrared light at most wavelengths, it contributes to the total acoustic signal in the analyses cell. Therefore, the monitor is permanently fitted with a special filter, which measures water vapor and enables the 1412 to compensate for water vapor’s interference. By selecting different filters, this technique can also be used to cross-compensate for known interferent gases.

Calibration
After the relevant optical filters are installed, the monitor must be calibrated. This is achieved through easy-to-use menu-driven instructions. With its high stability, calibration of the 1412 is seldom necessary more than once a year.

Calibration is performed using either the PC Software for Photoacoustic Field Gas-Monitor 7304 or directly from the front panel.

Operation
The 1412 monitoring system is easy to operate using either the PC Software or the front panel push-keys (which can be locked and accessed at three levels using passwords). The monitor can be operated as both an on-line and off-line instrument. Using these user-interfaces with their logical division of information, everything that needs to be defined is achieved prior to starting the monitoring task.

Setting-up the Monitor
The Set-up option enables all the parameters necessary to complete the monitoring task to be defined. Within this option, the Sample Integration Times (S.I.T.) is set – enabling measurement results to be weighted – sensitivity versus speed.

Starting Measurements
Once the set-up parameters have been defined, measure¬ments can be started either immediately or later using a delayed start time. Once started, the monitoring task then continues until it is stopped either manually or using a defined stop time.

Alarms
When measuring, two Alarm trigger levels, which provide high alarm limit for each measured gas, can be defined. These can also be linked to audible alarms. Using LumaSoft Gas Multi Point 7850, four alarm levels can be displayed.

Measurement Results
Online Measurements
Using one or more of the monitor’s standard interfaces, measurement results are transferred directly to a PC. Here they can be displayed on screen as real-time values in tables and graphs (see Fig. 1) or integrated into the process system.

In 7850, the graphs can be set up to display only the desired gases, defined concentration ranges and results from statistical analyses. Also, when using 7850, all measurement data is stored in the user-defined SQL Server 2005 database.

Offline Measurements
Gas-measurement result data is displayed on the 1412’s screen (Display Memory) as soon as it is available, and is constantly updated. During a task, the 1412 performs running statistical analyses of the measured gas concentra¬tions, calculating a variety of values for each monitored gas.

This data in Display Memory can be copied to the Background Memory, which is a non-volatile storage area. Data stored in Background Memory can be recalled to Display Memory. From this memory, data can, if necessary, be uploaded to 7304 and printed out in a list form on any standard text printer via the 1412’s IEEE and RS-232 interfaces.

Reliability
Executive self test check: software, data integrity, and the 1412’s components to ensure that they function properly. If a fault is found, it is reported in the measurement results, so that the integrity of the results can be ensured.
If the power supply fails, the 1412 will automatically start up again when power is restored. Measurement data stored in the monitor’s memory is not affected.

Maintenance
The only maintenance tasks necessary are calibration and changing the air filter. Both tasks are easily performed, and the frequency for changing the air filter depends on the individual applications.

Remote Control Options
LumaSense Technologies offers the LumaSoft Gas Multi Point 7850 software and the Application Software – INNOVA 7620.
Using 7850, a computer can remotely control a 1412 together with one or two Multipoint Sampler – INNOVA 1309 or up to four Multipoint Sampler and Doser – INNOVA 1303 for sequentially monitoring air samples from up to 24 locations. Measurement data is stored in the SQL Server 2005 database. Online acces to the measurement data from Microsoft Excel.

Using the 7620, a computer can control a 1412 together with up to two 1303 units. This enables up to 12 locations to be dosed with a tracer gas and air samples to be drawn from each location for analyses by the 1412. The software uses the resultant measurements to calculate the air change or ventilation efficiency of each location.

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