FTIR accessory: PA101S  

Sensitivity and low volume 

The PA101 measures low concentrations from very low gas volumes. High sensitivity is obtained by utilizing the patented cantilever based optical microphone technology.

Linearity 

The photoacoustic signal, unlike the conventional infrared detector output, is highly linear in a very wide dynamic range because new photoacoustic technology allows the use of short absorption path length without losing sensitivity. Wide linearity range allows the efficient subtraction of unwanted signals, such as water. Generally water vapor occurs in much higher amounts in gas mixtures than the analyte gas and it is usually very difficult to subtract using conventional detection.

Reliable concentration monitoring 

Absorption is measured directly with photoacoustic technique. This makes the measurement free of drift. It is the key factor for the unbeatable stability and reliability without frequent background measurement. Unlike in conventional transmission technique, interferometer instabilities do not show as large drifts in the photoacoustic spectra.

Applications 

lLow sample volume applications:

Headspace analysis

Analysis of synthesis processes

Analysis of decomposition processes Outgassing of materials

lWet gases

lMeasurements requiring high dynamic range

Features 

lPhotoacoustic detector with cantilever enhanced optical microphone

lVirtual zero-background measurement principle. Background drift of the FTIR instrument does not influence noticeably to the photoacoustic background.

lTotal gas volume of the system is low, approx. 30 ml

lA simple user interface with a display and buttons. The gas exchange procedure is user configurable. The gas exchange can be started manually with a press of a button or the instrument can be programmed to do it automatically using timer or an external trigger.

lThree gas connections in the front. The sample gas has two connections, one for input and one for output. The input is equipped with a particle filter. The purge input is for the IR beam path purging.

lTemperature stabilized gold coated gas cell with user selectable temperature from room temp. to 50 °C

lPatented ultra-sensitive optical microphone based on a MEMS cantilever sensor coupled with a laser interferometer to measure microscopic movement of the cantilever sensor.

lComplies with the following standards or other standardization documents under the Low Voltage Directive 2006/95/EC and EMC Directive 2004/108/EC: EN 613261:2005, EN 61010-1: 2001

l12 months warranty

Technical specifications 

lMaterials in contact with gas:

FPM, FKM (o-ring seals, solenoid valve seals)

PS, EPDM (gas pump)

Resin (solenoid valves)

Stainless steel (solenoid valves, tube connectors)

IR-window (BaF2, KBr, etc.)

Readout window (SiO2)

Nickel (gas exchange unit block, tube connector)

PTFE (tubes, particle filters)

PP (particle filters)

lDimensions: 16,5 cm W x 29,0 cm H x 16,5 cm D (6,5 in W x 11,4 in H x 6,5 in D)

lWeight: 6,0 kg

lTotal internal gas volume: 30 ml

lOperational conditions:

Temperature range: 0 °C – +45 °C

Humidity range: Below 90% RH, non-condensing

Pressure range: Ambient level

Dust/water resistance: IP20 (IEC 529)

Shock/vibration endurance: Vibrations can affect the measurement results

Acoustical level: Loud sounds can affect to the measurement results

lStorage conditions: Temperature  range: 0 °C - +60 °C

lSample gas conditions:

Temperature: Below the gas cell temperature and noncondensing

Pressure: 300 mbar – 1500 mbar

Moisture: Non-condensing at sample temperature

Gas flow with bypass flow: approx. 1 liters/minute

Particulates size < 1 μm

lGas connections: Push-in connector for 6/4 mm tubing

lElectrical connections:

Power supply unit:

Input voltage: 100 - 240 Vac, 50 - 60 Hz

Input power max: 30W

Analog outputs:

Output connectors: BNC

Output signal voltage span: ± 3.3 V

Output signal frequency band: Low pass filtered, 0-10kHz

Output load: >2k resistive

Trigger I/O:

CMOS compatible input

Open collector output

Triggering sequence programmable

lMeasurement specifications:

Detection limit: Gas dependent. Typically in the sub-ppm region.

Optical path length: 80 mm at optical axis

Repeatability: < 1 % of measured value in operational conditions at the calibration concentration

Temperature stability: Ambient temperature change within the operational temperature range will not cause drift Recommended FTIR scan speed: 0.16 cm/s or less (2.5 kHz HeNe frequency)

lFits to following FTIRs:

Bruker Tensor and Vertex series

Thermo Nicolet 6700/8700, Nexus series, iS10 and iS50

Perkin-Elmer Frontier, Spectrum One, Spectrum 100

Varian/Bio-Rad 3000/4000/6000/7000

Agilent/Varian 640/660/670/680

Jasco FT/IR-4000/6000

Shimadzu IRAffinity-1 /IRPrestige-21