Real time air monitoring system for personnel protection at a trichloroethane cleanup site
|Remediation site aerial|
1,1,1 Trichloroethane has been used as a solvent in industry, in home cleaning products and as a fumigant. We are involved in the development of a real time monitoring system for the cleanup of a closed chemical plant that had manufactured 1,1,1 trichloroethane (TCA). More precisely, we were concerned with minimizing the exposure of personnel and neighbors during this cleanup.
Continuous Analyzer Requirements
|Sensor: PID detector|
•The technology employed is photoionization
•The ionization potential (IP) of TCA is 10.70 eV, As a result, we would need an 11.7 eV lamp for this application.
•The IP’s of major components of air are:
•O2= 12.08 eV
These sensors use an integrated, 2.4GHz - 802.11b/g, FCC/CE certified radio transmitter that work with new and existing Wi-Fi networks. One of these transmitters is located in each of the 8 analyzers as well as the weather station.
Monnit’s MoWi sensors communicate through existing Wi-Fi networks to iMonnit, the online data monitoring system, which agrigates sensor information and sends notifications via text or email if user defined conditions are met or exceeded.
A PC at the site will collect the data, process it and store it locally. The data will then be sent via the internet to a protected website. Any change in weather conditions or TCA concentrations and/or alarm levels will be immediately sent to a mobile phone.
Data Collection Schematic
•A battery operated Model 112 uses photoionization to detect low MW chlorinated HC during remediation.
•The HW site has homes and a small town nearby so a fast responding analyzer with weather stations and wireless data logging connected to the internet is used to monitor the site at the remote location during the remediation.
•The remediation site can be shut down remotely by mobile phone if there is a combination of unacceptable levels of chlorinated HC or wind conditions that could affect the workers or residents in the local area
•This automated system will maximize safety at the plant/ fence line and the remote industrial hygienist can control the activities/problems at the plant.