A sensor probe for the continuous in situ monitoring of ammonia leakage in secondary refrigerant systems

Subramanian, R., Crowley, K., Morrin, A. and Killard, A. (2013) A sensor probe for the continuous in situ monitoring of ammonia leakage in secondary refrigerant systems. Analytical Methods, 5 (1). pp. 134-140. ISSN 1759-9660

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Publisher's URL: http://dx.doi.org/10.1039/C2AY25688F

Abstract

Ammonia is becoming more widely used in refrigeration systems due to the phasing out of CFCs and HCFCs. However, ammonia is a toxic gas and its leakage from refrigeration systems can lead to human exposure and contamination of refrigerated food stuffs. There is a lack of devices capable of the direct and continuous monitoring of leakage of ammonia into secondary refrigerant systems. Here we demonstrate an ammonia measurement probe for continuous contact monitoring of secondary refrigerants. The probe was based on an ammonia-sensitive film of inkjet printed polyaniline nanoparticles deposited onto an interdigitated electrode array and enclosed behind a polytetrafluoroethylene membrane. When operated impedimetrically, the probe was capable of the detection of ammonia across the industrially relevant range of 0 to 100 ppm from +4 to -15oC in water and brine. Operation of the probe as a simple threshold alarm without the requirement for temperature monitoring or calibration is illustrated.

Item Type:Article
Uncontrolled Keywords:ammonia, leakage, secondary refrigerant, sensor, polyaniline nanoparticles, probe, impedance
Faculty/Department:Faculty of Health and Applied Sciences > Department of Biological, Biomedical and Analytical Sciences
ID Code:17680
Deposited By: Professor T. Killard
Deposited On:09 Nov 2012 10:22
Last Modified:17 Feb 2014 20:07

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