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Device to indicate the concentration of ethylene oxide in the workplace

  • US 4,597,942 A
  • Filed: 08/15/1983
  • Issued: 07/01/1986
  • Est. Priority Date: 05/25/1983
  • Status: Expired due to Fees
First Claim
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1. A dosimeter for providing a contemporaneous, on-going visual indication of the total cumulative concentration of ethylene oxide to which a wearer of said dosimeter has been exposed, said dosimeter comprising,first sensor means responsive to ethylene oxide for enabling a continuous determination of the current concentration of ethylene oxide in an ambient environment,said first sensor means constituting a control reference area,gas-absorbing means for extracting, absorbing, retaining and cumulatively integrating ethylene oxide gas concentration present in an ambient environment,second sensor means in gas-sensing communication with said gas-absorbing means for reacting with ethylene oxide gas absorbed in and concentrated by said gas-absorbing means to permit a cumulative, quantitiative determination of total gas absorbed by said gas-absorbing means, and to indicate a wearer'"'"'s total exposure to ethylene oxide over a time-weighted average,said first and said second sensor means comprising liquid crystal compositions which exhibit color changes when exposed to ethylene oxide gas and siad first sensor means and said second sensor means being responsive to undergo color changes upon exposure to ethylene oxide whereby temperature effects between the two sensor means are cancelled, and wherein differences in color between said first sensor means and said second sensor means provide a quantitative indication of a concentration of ethylene oxide to which said dosimeter has been exposed.

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