1. Photoacoustic Multi-gas Monitor 1312

2. 1312, page 2 Photoacoustic Multi-gas Monitor 1312 Portable monitor for quantitative analysis of up to 5 gases and water vapour. Available in 1-, 2- and 5-gas version. Detection limits in the ppb range. Dynamic range up to x100.000. Versatile - adjustable measurement time/sample volume. Accurate - compensates for temperature fluctuations, water vapour interference and interference from other known gases. High stability - infrequent calibration. WIN software included.

3. 1312, page 3 Instrument Facilities Stores 5 different calibrations (gases) for each optical filter - in separate memories (filter banks). Built-in Memory, can be divided in 10 separate locations. Stores 12 days of measurements (5 gases + water vapour, sample every 10 min.). User defined alarm limits - independent for each gas. Regular self-tests of all vital parameters, ensures reliable results. Errors reported in error log for easy trouble-shooting. RS-232 and IEEE488 interface - for connection to PC or printer - enables direct export of data to PC - or direct printing of measurements.

4. 1312, page 4 Schematic Diagram

5. 1312, page 5 Optical Filters 26 optical filters, covering the Infrared region of interest. Optical filter to measure water vapour always installed. 5 positions available for installing optical filters for specific gases. Compensation for interference, by simultaneous measurement of gas and interference.

6. 1312, page 6 Cross-compensation S A = a 1,A x c 1 + a 2,A x c 2 + a 3,A x c 3 S B = a 1,B x c 1 + a 2,B x c 2 + a 3,B x c 3 S C = a 1,C x c 1 + a 2,C x c 2 + a 3,C x c 3 Where: S N is Microphone signal measuring with Filter N. a 1,N is absorption of gas 1 on Filter N. C 1 is concentration of gas 1. Gas1 Gas 2 Gas 3 Filter AFilter BFilter C

7. 1312, page 7 Special Features in 1312 Detection and sampling – Optimised measurement sequence for short Response Time. – Improved detection limits with variable Sample Integration Time (S.I.T.). Adjustable Flushing sequence – Low sample volume/ Fast Response. – Thorough flushing for accurate results.

8. 1312, page 8 Sample Integration Time

9. 1312, page 9 Detection Limit vs. Sample Integration Time

10. 1312, page 10 Flushing Volume

11. 1312, page 11 Flushing Performance

12. 1312, page 12 Response Time t r(Tube OFF) = 5 + t chamber + N filters (5 + SIT) t r(Tube ON) = 8 + t chamber + t tube + N filters (5 + SIT)

13. 1312, page 13 1312 PC-Software PC-Software package included with instrument. Compatible with Microsoft ® ODBC - for easy exchange of data. The software package contains: – On-line for monitoring with a PC connected. – Off-line for setting up the monitor and uploading data. – Presentation for viewing and analysing data off-line. – Calibration for evaluation and selection of calibration data. – Database Administration for data backup and export.

14. 1312, page 14 1312 PC-Software, On-line On-line is used for – Setting up sequences: » all measurement parameters » minimum & maximum alarms, activating PC beep, 1312 beep and/or 1312 relays – Presentation of data: » in tables » in graphs – Cursor Values: » data analysis between cursors » view settings at cursor position – Alarm Status: » giving an overview of active alarms – Measurements Status: » 1312 status and latest measurement values

15. 1312, page 15 1312 PC-Software Off-line is used for – Setting up: » all the measurement parameters in 1312 » the alarm actions that 1312 provides (maximum & relays) – Uploading measurement data from 1312 to PC. Presentation is used for analysing uploaded data – From any sequence in the task. – Zoom on any part of the sequence. – Scrolling through data.

16. 1312, page 16 1312 PC-Software, Calibration Displays calibration measurement data, selectable with cursors from either – Graphic curves – Numbers in tables Displays Statistical information during calibration task » minimum » maximum » average » standard deviation » slope Calculates the calibration parameters (Zero-point, Conversion factor, etc.) from the marked data

17. 1312, page 17 1312 PC-Software, Calibration Upload the present gas names and calibration parameters from 1312 Provides Back-up facility for calibration data – Store a single or all calibration banks from the 1312 (including optical filter information and gas names) – Download stored calibration parameters to any bank in the 1312 – Possibility to print out 1312 calibration data

18. 1312, page 18 1312 PC-Software, Calibration

19. 1312, page 19 1312 PC-Software, Calibration

20. 1312, page 20 1312 PC-Software, Presentation