Using wireless data transmission to maintain intrisnic safety of a gas meter
View Patent ↗A gas meter is outfit with near field communication (NFC) devices for in-situ exchange of data. The NFC devices reside in separate compartments. A first compartment houses electronics necessary to generate values for volumetric flow of material in a pipe. The gas meter includes a second compartment with an access point that allows data, including telemetry data, to transmit from the gas meter to a remote device. In operation, the NFC devices exchange data between the first compartment and the second compartment, often through a wall or barrier that prevents flow of fluid between the compartments.
1. An apparatus, comprising:
a flow responsive unit with mechanics that interact with flow of material in a pipe, the flow responsive unit having a cover sealing the mechanics and forming a connection; and
an electronics unit coupled with the connection and fluidly-sealed from the mechanics of the flow responsive unit, the electronics unit generating a value for volumetric flow rate for flow of material in the pipe, the electronics unit comprising,
a first housing attached to the connection;
a second housing attached to the first housing, wherein a peripheral wall of the first housing separates a first compartment of the first housing and a second compartment of the second housing to prevent flow of fluid between them;
a signal transfer unit disposed in each of the first compartment and the second compartment to wirelessly transmit data through the peripheral wall; and
an antenna disposed in the second compartment and connected directly to the signal transfer unit,
wherein the signal transfer unit comprises a pair of components that bi-directionally exchange data with each other, one each disposed in the first compartment and the second compartment and separate from one another by the peripheral wall, and each being configured to operate both as an initiator that controls data exchange and a target that responds to requests for data from the initiator.
2. The apparatus of claim 1 , wherein the electronics unit comprises a battery in the second compartment with a wired connection to the signal transfer unit.
3. The apparatus of claim 1 , wherein the signal transfer unit includes a component that generates a field in each of the first compartment and the second compartment.
4. The apparatus of claim 1 , wherein the signal transfer unit comprises inductive coils.
5. The apparatus of claim 1 , wherein the signal transfer unit comprises a pair of inductive coils, one each disposed in the first compartment and the second compartment proximate the peripheral wall.
6. The apparatus of claim 1 , wherein the signal transfer unit comprises a pair of dynamic NFC tags, one each disposed in the first compartment and the second compartment proximate the peripheral wall.
7. The apparatus of claim 1 , wherein the peripheral wall forms a contiguous surface that is free of openings proximate the signal transfer unit.
8. A gas meter, comprising:
a meter body with mechanics disposed therein and a cover that seals the mechanics and forms a connection;
a first housing coupled with the connection of the meter body and fluidly-sealed from the mechanics;
a second housing fastened to the first housing so that a wall of the first housing creates a barrier that prevents flow of fluid between interior space of the first housing and the second housing;
a signal transfer unit with first and second components comprising inductive coils, one disposed in each of the first housing and the second housing proximate the barrier; and
an antenna disposed in the second housing and connected directly to the signal transfer unit,
wherein the first and second components bi-directionally exchange data with each other, and both operate as an initiator that controls data exchange and a target that responds to requests for data from the initiator.
9. The gas meter of claim 8 , further comprising:
a battery disposed in the second housing and coupled with the inductive coils.
10. The gas meter of claim 8 , further comprising:
an NFC tag disposed in each of the first housing and the second housing and coupled with the inductive coils.