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The AutoStep Plus is a microprocessor-controlled instrument for leak detection, survey work, area monitoring and emergency response involving isocyanates. The AutoStep produces a color reaction on a paper tape cassette that is gas specific. The alpha-numeric LCD display shows concentration and an 80 dB alarm alerts the user to a preset level of isocyanate exposure. Software is included with the rental unit. The paper tape cassette, which is a purchased item, supplies 16 hours of continuous monitoring. A single tape is used for TDI, MDI or HDI, with the user selecting the gas type. The tape does not have to be refrigerated.

Key Features

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  • Response time of 12 seconds.\r
  • Instrinsically safe, UL listed.

Technical Specifications

Measurement Range TDI and HDI: 0 to 500 ppb at 1 ppb resolution
Accuracy ± 15% of reading or 1 ppb, whichever is
Datalogging 2000 data points
Output RS-232 port, analog output or 0 to 1V
Approvals UL intrinsically safe for Class I, Division 1
Power Lead acid cells, 12 hours operation, or AC operation


  US Metric
H x W x D 8.55 x 3.85" x 9.62"" 217 x 98 x 244 mm


  US Metric
H x W x D 4.75 lbs 2.2 kg