Fiber Optic ATR Probes for Harsh Environment

FlexiSpec® probes include new type of Attenuated Total Reflection (ATR) probes designed for harsh application conditions.
HT-ATR immersion IR-fiber probes can be used for process-spectroscopy in Near & Mid IR range to monitor reactions in-line in a broad temperature range from -100° to +250°C. HT-ATR immersion IR-fiber probes can withstand pressures up to 200Bar and used with FTIR or any other IR-spectrometers and spectral sensors in automated process control with process-interfaces.

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Key Features

  • High throughput in selected parts of near and mid-infrared-spectra
  • ATR tip shaped for immersion in the liquid flow without dead zone
  • Robust for industrial applications in harsh environment up to 250°C
  • Resistant to high pressure
  • Compatible with all spectrometers and automated process-interfaces


  • Remote reaction monitoring in-line in the temperature range -100/+250°C
  • PAT applications in lab, pilot plant or industries with process-interfaces for automated process control
  • Polymerization process control
  • In-situ IR-spectroscopy for PAT in chemical, petrochemical, atomic, biopharmaceutical and food industry


Probe typeDiamond ATRSilicon ATRCubic Zirconium ATR
Transmission5.2-17μm (600-1900cm -1) + 3.2-4.5μm (2300-3100cm-1)5.2-17μm (600-3100cm -1)1.5-6.5μm (1550-6650cm-1)
Fiber typePIR-900/1000 Silver HalidePIR-900/1000 Silver HalideCIR 500/550 Chalcogenide glass (As-S)
Temperature range-100°C / + 250°C-100°C / + 250°C-100°C /+ 200°C
Pressure (max)200Bar100Bar100Bar


Total Length1.5m (opt.: 1m to 5m)*
Shaft Length300 mm (opt.: 300-700 mm)*
Shaft Diameter12 mm
Shaft MaterialHastelloy C22
Length of Legs500 mm (opt.: 200 mm to 500 mm)
Protective Tube MaterialLiquid Tight SS-Conduit, KOPEX-Tube
Minimal Bending Radius130 mm
Input / Output ConnectorsLong SMA (opt.: any other type)
Cooling Air Flow ParametersExcess pressure 0.5 Bar, Flow 2300l/h
Inner temperature controlInside shaft to control ATR tip temperature