Abstract: Methods, apparatuses and systems for providing gas-sensitive substrates are disclosed herein. An example apparatus may comprise: a gas-sensitive substrate at least partially disposed within a gas flow channel of the gas detecting apparatus, wherein at least a portion of the gas-sensitive substrate is treated to mimic stain characteristics produced by at least one interferent gaseous substance, and the gas-sensitive substrate is configured to produce a stain in response to making contact with at least one target gaseous substance disposed within the gas flow channel.

Abstract: A method includes forming a gas-sensitive substrate during a production process by dispensing one or more gas-sensitive materials onto the substrate and drying the one or more gas-sensitive materials on the substrate. The method also includes adjusting the production process based on one or more sensor measurements associated with the substrate and/or the production process. Adjusting the production process could include conditioning air around the substrate so that the conditioned air has one or more specified characteristics and adjusting the one or more specified characteristics based on the one or more sensor measurements. The one or more sensor measurements could include one or more measurements of a moisture content of the substrate. Adjusting the production process could also include adjusting a tension of the substrate. The one or more gas-sensitive materials could be deposited in multiple regions of the substrate, such as along multiple tracks extending lengthwise down the substrate.

Abstract: A method includes forming a gas-sensitive substrate during a production process by dispensing one or more gas-sensitive materials onto the substrate and drying the one or more gas-sensitive materials on the substrate. The method also includes adjusting the production process based on one or more sensor measurements associated with the substrate and/or the production process. Adjusting the production process could include conditioning air around the substrate so that the conditioned air has one or more specified characteristics and adjusting the one or more specified characteristics based on the one or more sensor measurements. The one or more sensor measurements could include one or more measurements of a moisture content of the substrate. Adjusting the production process could also include adjusting a tension of the substrate. The one or more gas-sensitive materials could be deposited in multiple regions of the substrate, such as along multiple tracks extending lengthwise down the substrate.

Abstract: A mineral acid detection tape includes a cellulose paper substrate saturated with a formula solution and provides an extended life detection tape of at least a three-month period of time when place in service.

Abstract: A mineral acid detection tape includes a cellulose paper substrate saturated with a formula solution and provides an extended life detection tape of at least a three-month period of time when place in service.