Patent Description:
Typically, gas detectors may be deployed in different work environments and industries for detecting presence of unwanted and harmful gases in the ambient air. Such gases may be present in the ambient air due to, amongst other reasons, a leakage in a gas container or a pipe line that stores or supplies the gases. The gas detectors may monitor the concentration of such gases in the ambient air and issue an alert when the concentration of the gases exceed acceptable levels.

There may be different types of gas detectors used for detecting the gases. Some examples of the gas detectors may include, but are not limited to, electrochemical cell-based gas detectors, acoustic gas detectors, solid state gas detector, and/or the like. Usually, the gas detectors detect gases based on at least a chemical reaction between the gas and one or more electrodes in a gas detector. Typically, the rate of chemical reaction in such a gas detector may vary based on one or more parameters such as temperature, pressure, and/or the like. For seamless operation of the gas detectors in the work environment, it may be required to calibrate such gas detectors, prior to deployment, such that the calibrated gas detectors are able to operate in varying work environments.

<CIT> discloses a gas detector with an integrated calibration system.

Applicant has identified a number of deficiencies and problems associated with methods and systems of calibrating a gas detector. Through applied effort, ingenuity, and innovation, many of these identified problems have been solved by developing solutions that are included in embodiments of the present disclosure, many examples of which are described in detail herein.

According to the embodiments disclosed herein, a gas detector calibration system is disclosed. The gas detector calibration system comprises a control unit and a temperature regulation assembly. The temperature regulation assembly is electrically connected with the control unit and has an inlet and an outlet. The temperature regulation assembly is configured to receive ambient air through the inlet of the temperature regulation assembly and modify a temperature of the ambient air. After regulating the temperature of the ambient air, the ambient air is supplied to a gas detector through the outlet of the temperature regulation assembly. The gas detector calibration system comprises a temperature sensor that is electrically connected with the control unit and is placed in proximity to the gas detector to measure a temperature of the gas detector. The temperature sensor sends a signal indicative of the temperature of the gas detector to the control unit. The control unit determines whether the temperature of the gas detector is within a predefined temperature range. When the temperature of the gas detector is within the predefined temperature range, the gas detector is calibrated using a calibration gas.

According to the embodiments disclosed herein, a method for calibrating the gas detector is disclosed. The method comprises causing, by the control unit, the temperature regulation assembly to modify the temperature of the ambient air supplied to the gas detector. The method comprises receiving, by the control unit, a signal indicative of the temperature of the gas detector from the temperature sensor and determining, by the control unit, whether the temperature of the gas detector is within the predefined temperature range. After determining that the temperature is within the predefined temperature range, the method comprises calibrating the gas detector by using the calibration gas.

Terminology used in this patent is not meant to be limiting insofar as devices described herein, or portions thereof, may be attached or utilized in other orientations.

The term "comprising" means including but not limited to and should be interpreted in the manner it is typically used in the patent context. Use of broader terms such as "comprises," "includes," and "having" should be understood to provide support for narrower terms such as "consisting of," "consisting essentially of," and "comprised substantially of.

The phrases "in one embodiment," "according to one embodiment," and the like generally mean that the particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of the present disclosure, or may be included in more than one embodiment of the present disclosure (importantly, such phrases do not necessarily refer to the same embodiment).

The "gas detector" as described in the embodiments herein refers to a device for measuring and indicating concentration of a gas. The gas detector has a sensor that aids in measuring the concentration of the gas in the ambient air. The gas detector is generally a stationary or a portable unit that may be battery operated. The gas detector has one or more audible or visible indicators, such as alarms, lights or a combination of signals to indicate a level of the gas. The gas detector can detect one type of gas or more than one type of gases at once. There are different types of gas detectors based on type of sensors used. Some examples of the gas detector may include, but are not limited to, Electrochemical (EC) sensors, Lower Explosive Limit (LEL) sensors, Nondispersive Infrared (NDIR) sensors, and Photoionization Detector (PID).

The "temperature sensor" is used for detecting a temperature of a device or an ambient. The temperature sensor may generate an electrical signal corresponding to the detected temperature. Some examples of the temperature sensor may include, but are not limited to, a thermocouple, a resistive temperature measuring device, a bimetallic device, a digital thermometer, and a change of state sensor.

The "gas" may either be toxic, flammable or asphyxiant in nature that may be harmful for users working at a workplace. Presence of the gas above an acceptable level may be undesirable and may lead to a hazardous event. Most common toxic gases include, but are not limited to, carbon monoxide, chlorine, nitrogen oxide and hydrogen sulfide.

The "calibration gas" corresponds to a gas in a pure form that is used for calibrating the gas detector. The calibration gas may also have a mixture of gases that is generally compressed and supplied to the gas detector for calibration. An example of the calibration gas may include a pure nitrogen gas used for calibrating a carbon dioxide gas detector.

Gas detectors are installed at different work environments and industries to detect unwanted gases and prevent a gas hazard. The gases may be present in the ambient air due to, amongst other reasons, a leakage in a gas container or a pipe line that stores or supplies the gases. The gas detectors constantly monitor the concentration of such gases and alert users when the concentration of the gases is above the acceptable level.

Usually, the gas detectors may be calibrated prior to deployment, such that the calibrated gas detector is able to operate in varying work environments. For example, the gas detector may be calibrated to operate in different temperature conditions. The gas detectors, upon deployment in a work environment, constantly detect gases and over a period, develop issues such as material consumption and faulty or erroneous operation. Other factors, such as exposure to toxic gases and temperature variations may also affect the operation of the gas detectors. For instance, the Electrochemical (EC) sensors may have material consumption issues and the PID and the NDIR sensors may have component degradation issues. Generally, the gas detectors are calibrated onsite at regular time intervals to prevent such issues. The calibration is performed at a temperature of the work environment and any variations in the temperature can cause improper calibration and lead to erroneous operation of the gas detectors during deployment.

The apparatuses described herein disclose a gas detector calibration system that may calibrate a gas detector to operate at different temperature conditions of work environments. The gas detector calibration system comprises a control unit, a temperature regulation assembly having an inlet and an outlet, a temperature sensor, a gas detector, a pump having a pump inlet and a pump outlet, an atmospheric filter, and a plurality of valves.

In an example embodiment, the inlet of the temperature regulation assembly is fluidly coupled to the atmospheric filter. The inlet of the temperature regulation assembly is fluidly coupled to a gas container storing calibration gas. The outlet of the temperature regulation assembly is fluidly coupled to the pump inlet of the pump. The pump outlet of the pump is fluidly coupled to a chamber. The chamber may be a housing or a container within which the gas detector and the temperature sensor may be positioned. In some examples, which do not form part of the present invention, the gas detector includes the temperature sensor that is configured to measure a temperature of the gas detector. According to the invention, the temperature sensor is positioned in proximity to the gas detector to detect the temperature of the gas detector.

In the present invention, the temperature regulation assembly, the pump, and the temperature sensor are electrically connected to the control unit. The control unit is configured to control the operation of the temperature regulation assembly, the pump, and the temperature sensor.

In an example embodiment, prior to calibrating the gas detector, the control unit may activate the pump. Since the pump is fluidly coupled to the temperature regulation assembly and the temperature regulation assembly is fluidly coupled to the ambient through the atmospheric filter, therefore, when the control unit activates the pump, the temperature regulation assembly receives the ambient air from the ambient. In an example embodiment, a first valve controls flow of the ambient air from the atmospheric filter to the temperature regulation assembly, and the control unit may activate the first valve to an open state to allow flow of the ambient air from the atmospheric filter to the temperature regulation assembly.

Concurrently, the control unit may instruct the temperature regulation assembly to modify the temperature of the received ambient air based on a predefined temperature range, such that the temperature of the ambient air is within the predefined temperature range. In an example embodiment, the predefined temperature range may correspond to a temperature range within which the gas detector is to be calibrated. For example, the control unit may instruct the temperature regulation assembly to reduce the temperature of the ambient air. In some examples, the control unit may instruct the temperature regulation assembly to heat the ambient air. Accordingly, in some examples, the temperature regulation assembly generates ambient air having a first temperature. Since the pump is operating in an active state and the inlet of the pump is fluidly coupled to the outlet of the temperature regulation assembly, the pump receives the ambient air at a first temperature from the temperature regulation assembly. In an example embodiment, the first temperature may correspond to a temperature at which the gas detector is to be calibrated. In some examples, the predefined temperature range includes the first temperature. In an alternative embodiment, the control unit may determine the predefined temperature range based on the first temperature at which the temperature regulation assembly is being operated. For example, the control unit may determine the predetermined temperature range as ± <NUM> degrees of the first temperature.

The pump forwards the ambient air at the first temperature to the gas detector through the pump outlet. The ambient air, at the first temperature, passes through the chamber. As the ambient air passes through the chamber, the ambient air modifies an initial temperature of the gas detector. In an example embodiment, the initial temperature may correspond to a temperature of the gas detector prior to calibrating the gas detector.

In an example embodiment, the temperature sensor, adjacent to the gas detector, determines a second temperature of the gas detector at regular intervals. In an example embodiment, the second temperature of the gas detector corresponds to a current temperature of the gas detector while the ambient air at the first temperature passes through the gas detector. Further, the temperature sensor transmits a signal indicative of the second temperature of the gas detector to the control unit.

In an example embodiment, the control unit determines whether the second temperature of the gas detector is equal to the first temperature or within the predefined temperature range. In an instance in which the second temperature of the gas detector is within the predefined temperature range, the control unit deactivates the pump to stop flow of the ambient air through the gas detector. Thereafter, the control unit causes flow of a calibration gas to the gas detector for calibrating the gas detector at the determined temperature. In an example embodiment, a second valve controls flow of the calibration gas to the temperature regulation assembly, and the control unit may activate the second valve to an open state to allow flow of the calibration gas to the temperature regulation assembly.

The aforementioned process can be used to calibrate the gas detector in the predefined temperature range that is optimum for calibrating the gas detector. Calibrating the gas detector at a temperature, such as the second temperature, reduces variations in the temperature during calibration thereby eliminating issues related to erroneous operation of the gas detector during calibration.

The details regarding additional components and functioning of various components of the gas detector calibration system is explained further with respect to description of <FIG>.

<FIG> illustrates a gas detector calibration system <NUM>, according to one or more embodiments described herein. In an example embodiment, the gas detector calibration system <NUM> may be capable of calibrating gas detectors, such as a gas detector <NUM>.

In an example embodiment, the gas detector calibration system <NUM> may include the gas detector <NUM>, a control unit <NUM>, a temperature regulation assembly <NUM>, a pump <NUM>, an atmospheric filter <NUM>, a plurality of valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM>, and a chamber <NUM>.

In an example embodiment, the temperature regulation assembly <NUM> may include suitable components such as a heating unit and a cooling unit that may be configured to modify a temperature of a gas passing through the temperature regulation assembly <NUM> based on an instruction received from the control unit <NUM> about the temperature. For example, the temperature regulation assembly <NUM> may modify the temperature of ambient air that passes through the temperature regulation assembly <NUM>. The temperature regulation assembly <NUM> has an inlet <NUM> and an outlet <NUM>.

In an example embodiment, the inlet <NUM> of the temperature regulation assembly <NUM> may be configured to receive ambient air through the atmospheric filter <NUM>. In some examples, the atmospheric filter <NUM> is fluidly coupled to the temperature regulation assembly <NUM> through a first conduit <NUM> and is positioned upstream of the temperature regulation assembly <NUM>. In an example embodiment, the atmospheric filter <NUM> is to receive the ambient air by removing dust particles from the ambient air and supply the ambient air to the temperature regulation assembly <NUM>. In an example embodiment, the atmospheric filter <NUM> may be one of an electrostatic filter, an activated carbon filter, and an Ultraviolet (UV) light filter. In an example embodiment, to control the flow of the ambient air to the temperature regulation assembly <NUM>, the first conduit <NUM> may have a first valve <NUM>-<NUM> that is positioned downstream of the atmospheric filter <NUM>, (along the flow of the ambient air and upstream of the temperature regulation assembly <NUM>). In an example embodiment, the first valve <NUM>-<NUM> may have an open state and a closed state. In the open state, the valve <NUM>-<NUM> allows flow of the ambient air through the first conduit <NUM>, and in the closed state, the valve <NUM>-<NUM> stops the flow of the ambient air through the first conduit <NUM>. The first valve <NUM>-<NUM> may be a gate valve, a globe valve, a plug valve, a ball valve, a butterfly valve, a swing check valve, a diaphragm valve, a pinch valve, a safety valve, and a relief valve.

In some examples, the inlet <NUM> of the temperature regulation assembly <NUM> is further coupled to a gas container <NUM> through a second conduit <NUM>. In some examples, the gas container <NUM> may be a storage container to store a calibration gas in a compressed form. The gas container <NUM> may have a valve opening (not shown) through which the gas container <NUM> may supply the calibration gas. In some examples, the second conduit <NUM> may be coupled to the valve opening of the gas container <NUM>. Similar to the first conduit <NUM>, the second conduit <NUM> includes a second valve <NUM>-<NUM> that may be configured to control the flow of the calibration gas through the second conduit <NUM> to the temperature regulation assembly <NUM>. In an example embodiment, the second valve <NUM>-<NUM> is similar to the first valve <NUM>-<NUM> in structure and function.

In an example embodiment, the outlet <NUM> of the temperature regulation assembly <NUM> may be fluidly coupled to a pump inlet <NUM> through a third conduit <NUM>. Further, a pump outlet <NUM> may be coupled to the chamber <NUM> through a fourth conduit <NUM>. In an example embodiment, the pump <NUM> may cause the ambient air and the calibration gas to flow through the temperature regulation assembly <NUM>. Further, the pump <NUM> may cause the ambient air or the calibration gas to flow through the other components of the system <NUM> connected downstream of the pump <NUM>. For example, the pump <NUM> may cause the ambient air or the calibration gas to flow through the chamber <NUM>. Examples of the pump <NUM> may include, but are not limited to, a centrifugal pump, a vertical centrifugal pump, a horizontal centrifugal pump, a diaphragm pump, a gear pump, a peristaltic pump, a Lobe pump, and a piston pump.

In an example embodiment, the chamber <NUM> may be a housing or an encasing to receive the gas detector <NUM> and a temperature sensor <NUM>. The chamber <NUM> provides a closed environment to the gas detector <NUM> for calibration and insulates the gas detector <NUM> from outside temperature during calibration. The chamber <NUM> has a first opening to receive an end of the fourth conduit <NUM> and a second opening to receive an end of a feedback conduit <NUM>. In an example embodiment, the gas detector <NUM> is positioned in proximity to the first opening of the chamber <NUM> and the temperature sensor <NUM> is positioned adjacent to the gas detector <NUM> for determining temperature of the gas detector <NUM>.

In an example embodiment, the chamber <NUM> is coupled to the inlet <NUM> of the temperature regulation assembly <NUM> through the feedback conduit <NUM>. Further, the feedback conduit <NUM> has an exhaust conduit <NUM> and a third valve <NUM>-<NUM> is connected to the exhaust conduit <NUM>. In an example embodiment, the third valve <NUM>-<NUM> is similar to the other two valves <NUM>-<NUM> and <NUM>-<NUM> in structure and function.

In an example embodiment, the temperature regulation assembly <NUM>, the pump <NUM>, the temperature sensor <NUM>, the valves <NUM>-<NUM>, <NUM>-<NUM>, and <NUM>-<NUM> are electrically connected to the control unit <NUM>. In some examples, the control unit <NUM> is configured to control the operation of the temperature regulation assembly <NUM> by sending a signal regarding the first temperature at which the temperature regulation assembly <NUM> is to be operated for modifying temperature of the ambient air, as is further described in <FIG>. In an example embodiment, the control unit <NUM> is configured to activate the pump <NUM>. The control unit <NUM> is configured to operate the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM> to switch states between an open state and a closed state to control the flow of the ambient air or the calibration gas through the system <NUM>, as described in <FIG>. The control unit <NUM> is configured to receive signals from the temperature sensor <NUM> regarding the second temperature and any other temperature between the first temperature and the second temperature of the gas detector <NUM> during modification of the temperature of the gas detector <NUM>. In an example embodiment, the first temperature corresponds to a temperature at which the gas detector <NUM> is to be calibrated, and the second temperature corresponds to a current temperature of the gas detector <NUM> while the ambient air at the first temperature passes through the gas detector <NUM>.

The details of the components of the control unit <NUM> and the working of the components is described with reference to <FIG>, <FIG> and <FIG>.

<FIG> illustrates a block diagram of the control unit <NUM>, according to one or more embodiments described herein. The control unit <NUM> includes a processor <NUM>, a memory device <NUM>, a first input/output (I/O) device interface unit <NUM>, a temperature controller <NUM>, and a valve and pump controller <NUM>.

The processor <NUM> may be embodied as means including one or more microprocessors with accompanying digital signal processor(s), one or more processor(s) without an accompanying digital signal processor, one or more coprocessors, one or more multicore processors, one or more controllers, processing circuitry, one or more computers, various other processing elements including integrated circuits such as, for example, an application specific integrated circuit (ASIC) or field programmable gate array (FPGA), or some combination thereof. Accordingly, although illustrated in <FIG> as a single processor, in an embodiment, the processor <NUM> may include a plurality of processors and signal processing modules. The plurality of processors may be embodied on a single electronic device or may be distributed across a plurality of electronic devices collectively configured to function as the circuitry of the control unit <NUM>. The plurality of processors may be in operative communication with each other and may be collectively configured to perform one or more functionalities of the circuitry of the control unit <NUM>, as described herein. In an example embodiment, the processor <NUM> may be configured to execute instructions stored in the memory device <NUM> or otherwise accessible to the processor <NUM>. These instructions, when executed by the processor <NUM>, may cause the circuitry of the control unit <NUM> to perform one or more of the functionalities as described herein.

Whether configured by hardware, firmware/software methods, or by a combination thereof, the processor <NUM> may include an entity capable of performing operations according to embodiments of the present disclosure while configured accordingly. Thus, for example, when the processor <NUM> is embodied as an ASIC, FPGA or the like, the processor <NUM> may include specifically configured hardware for conducting one or more operations described herein. Alternatively, as another example, when the processor <NUM> is embodied as an executor of instructions, such as may be stored in the memory device <NUM>, the instructions may specifically configure the processor <NUM> to perform one or more algorithms and operations described herein.

Thus, the processor <NUM> used herein may refer to a programmable microprocessor, microcomputer or multiple processor chip or chips that can be configured by software instructions (applications) to perform a variety of functions, including the functions of the various embodiments described above. In some devices, multiple processors may be provided which are dedicated to wireless communication functions, and one processor may be provided which is dedicated to running other applications. Software applications may be stored in the internal memory before they are accessed and loaded into the processors. The processors may include internal memory sufficient to store the application software instructions. In many devices, the internal memory may be a volatile or nonvolatile memory, such as flash memory, or a mixture of both. The memory can also be located internal to another computing resource (e.g., enabling computer readable instructions to be downloaded over the Internet or another wired or wireless connection).

The memory device <NUM> may include suitable logic, circuitry, and/or interfaces that are adapted to store a set of instructions that is executable by the processor <NUM> to perform predetermined operations. Some of the commonly known memory implementations include, but are not limited to, a hard disk, random access memory, cache memory, read only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, a compact disc read only memory (CD-ROM), digital versatile disc read only memory (DVD-ROM), an optical disc, circuitry configured to store information, or some combination thereof. In an example embodiment, the memory device <NUM> may be integrated with the processor <NUM> on a single chip, without departing from the scope of the disclosure.

The I/O device interface unit <NUM> may include suitable logic and/or circuitry that may be configured to communicate with the one or more components of the gas detector calibration system <NUM>, in accordance with one or more device communication protocols such as, but not limited to, I2C communication protocol, Serial Peripheral Interface (SPI) communication protocol, Serial communication protocol, Control Area Network (CAN) communication protocol, and <NUM>-Wire® communication protocol. In an example embodiment, the I/O device interface unit <NUM> may communicate with the temperature sensor <NUM> and the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM> for facilitating the transmission and reception of the data and signal to and from the temperature sensor <NUM> and the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM>, as is further described in conjunction with <FIG>. Some examples of the I/O device interface unit <NUM> may include, but are not limited to, a Data Acquisition (DAQ) card, an electrical drives driver circuit, and/or the like.

The temperature controller <NUM> may include suitable logic and/or circuitry that may instruct the temperature regulation assembly <NUM> to operate at a particular temperature (e.g., first temperature), as is further described in <FIG>. The temperature controller <NUM> may be configured to receive a signal from the temperature sensor indicative of the temperature, as is further described in <FIG>. Further the temperature controller may be configured to compare the temperature with the predefined temperature, as is further described in <FIG>. The temperature controller <NUM> may be implemented using one or more hardware components, such as, but not limited to, FPGA, ASIC, and the like.

The valve and pump controller <NUM> may include suitable logic and/or circuitry that may operate the pump <NUM> to operate and control flow of the ambient air and the calibration gas to the gas detector <NUM>, as is further described in conjunction with <FIG>. The valve and pump controller <NUM> may be further configured to switch states of the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM> between an open state and a closed state to control flow of the ambient air and the calibration gas in the gas detector calibration system <NUM>. The valve and pump controller <NUM> may be implemented using one or more hardware components, such as, but not limited to, FPGA, ASIC, and the like.

The operation of the control unit <NUM> is described later in conjunction with <FIG>.

Referring to <FIG>, in conjunction with <FIG> and <FIG>, a flowchart illustrating operations for calibrating a gas detector, such as the gas detector <NUM>, is described. <FIG> shows the flowchart illustrating operation of the control unit, in accordance with the example embodiments described herein.

Turning first to step <NUM>, the gas detector calibration system <NUM> includes means, such as, the control unit <NUM>, the processor <NUM>, the temperature controller <NUM>, and/or the like, causing the temperature regulation assembly <NUM> to operate at a first temperature. For this, the temperature controller <NUM> is configured to send a signal to the temperature regulation assembly <NUM> regarding the first temperature at which the temperature regulation assembly <NUM> is to be operated. In an example embodiment, the temperature controller <NUM> may receive an input regarding the first temperature from a user. In an alternative embodiment, the temperature controller <NUM> may receive the first temperature from another temperature sensor (not shown) installed in a work environment.

At step <NUM>, the gas detector calibration system <NUM> includes means, such as, the control unit <NUM>, the processor <NUM>, the valve and pump controller <NUM>, and/or the like, to cause opening of the first valve <NUM>-<NUM> by activating an open state of the valve <NUM>-<NUM> and closing of the second valve <NUM>-<NUM> and the third valve <NUM>-<NUM> by activating closed states of the second valve <NUM>-<NUM> and the third valve <NUM>-<NUM>. In an example embodiment, each of the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM> may have an open state and a closed state. In the open state, the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM> allow flow of the ambient air or calibration gas. In the closed state, the valves <NUM>-<NUM>, <NUM>-<NUM> and <NUM>-<NUM> stop the flow of the ambient air or the calibration gas.

At step <NUM>, the gas detector calibration system <NUM> includes means, such as, the control unit <NUM>, the processor <NUM>, the valve and pump controller <NUM>, and/or the like, to activate the pump <NUM> to cause the ambient air to flow to the temperature regulation assembly <NUM> from the atmospheric filter <NUM>.

Thereafter, at step <NUM>, the temperature controller <NUM> is configured to cause the temperature regulation assembly <NUM> to modify a temperature of ambient air based on the predefined temperature range to bring the temperature of the ambient air to the first temperature. The predefined temperature range, as explained earlier, may be an optimum range for the calibration of the gas detector <NUM> and may be stored in the temperature controller <NUM>. The temperature of the ambient air may be modified, for instance, by passing the ambient air through either the heating unit or the cooling unit of the temperature regulation assembly <NUM>. In an example, the predefined temperature range is from about <NUM><NUM>C to about <NUM><NUM>C. For instance, if the room temperature is around <NUM><NUM>C, then the ambient air is passed through the heating unit to heat the ambient air to reach a temperature within the predefined temperature range.

After regulating the temperature, the pump <NUM> receives the ambient air from the temperature regulation assembly <NUM> through the outlet <NUM>, the third conduit <NUM> and the pump inlet <NUM> and supplies the ambient air to the gas detector <NUM> through the pump outlet <NUM> and the fourth conduit <NUM>. In an alternative embodiment, the pump <NUM> supplies the ambient air to the chamber <NUM> having the gas detector <NUM> and the temperature sensor <NUM>. The gas detector <NUM> is positioned in proximity to the first opening of the chamber <NUM> and the temperature sensor <NUM> is positioned adjacent to the gas detector <NUM>.

After supplying the ambient air to the gas detector <NUM>, the temperature sensor <NUM> determines the temperature of the gas detector <NUM>. As the ambient air with the modified temperature passes through the gas detector <NUM>, the temperature of the gas detector <NUM> is modified from the initial temperature to the second temperature. The temperature sensor <NUM> determines the second temperature of the gas detector <NUM>.

At step <NUM>, the temperature controller <NUM> receives a signal indicative of the temperature, for instance the second temperature, of the gas detector <NUM> from the temperature sensor <NUM>. In an example embodiment, the temperature controller <NUM> causes the temperature sensor <NUM> to determine the temperature of the gas detector <NUM> and send the signal after every preset period. For example, the temperature sensor <NUM> may determine the temperature after every <NUM> seconds and send a corresponding signal to the temperature controller <NUM>.

At step <NUM>, the processor <NUM> may determine if the second temperature of the gas detector <NUM> is within the predefined temperature range. In an embodiment, the processor <NUM> may determine if the second temperature is equal to the first temperature. If the processor <NUM> determines the second temperature is not within the predefined temperature range, then the valve and pump controller <NUM> is configured to allow flow of the ambient air back to the inlet <NUM> of the temperature regulation assembly <NUM> through the feedback conduit <NUM>, by keeping the third valve <NUM>-<NUM> closed. The ambient air is again heated or cooled to bring the temperature of the ambient air within the predefined temperature.

The pump <NUM> receives the ambient air and supplies the ambient air to the gas detector <NUM>. The temperature sensor <NUM> then determines a third temperature of the gas detector <NUM> and sends a signal to the temperature controller <NUM>. Thereafter, valve and pump controller <NUM> is configured to operate the third valve <NUM>-<NUM> to open and release the ambient air outside the gas detector calibration system <NUM> through the exhaust conduit <NUM> of the feedback conduit <NUM>, when the third temperature of the gas detector <NUM> is within the predefined temperature range or equal to the first temperature. Further, the valve and pump controller <NUM> is configured to close the first valve <NUM>-<NUM> by activating the first valve <NUM>-<NUM> to a closed state to stop the flow of the ambient air, and activating the third valve <NUM>-<NUM> to a closed state?, and opening the second valve <NUM>-<NUM> by activating the second valve <NUM>-<NUM> to an open state to allow the calibration gas to flow through the second conduit <NUM> for calibration of the gas detector <NUM>.

Thereafter, at step <NUM>, the gas detector calibration system <NUM> includes means, such as the control unit <NUM>, the processor <NUM>, the valve and pump controller <NUM>, and/or the like, to supply the calibration gas to the gas detector <NUM> for calibration by activating an open state of the second valve <NUM>-<NUM> for flow of the calibration gas from the gas container <NUM> to the temperature regulation assembly <NUM> and then supplying the calibration gas from the temperature regulation assembly <NUM> to the gas detector <NUM>.

In an example embodiment, the valve and pump controller <NUM> is configured to supply the calibration gas to the temperature regulation assembly <NUM> prior to supplying the calibration gas to the gas detector <NUM>, by activating the second valve <NUM>-<NUM> in an open state. The calibration gas is supplied to the temperature regulation assembly <NUM> to modify the temperature of the calibration gas to the first temperature.

The temperature of the calibration gas is modified to bring the temperature of the calibration gas within the predefined temperature range. The regulation of the temperature of the calibration gas may be performed such that the calibration gas has the same temperature as the gas detector <NUM>, as the temperature difference between the gas detector <NUM> and the calibration gas may cause error during calibration. After modifying the temperature of the calibration gas, the valve and pump controller <NUM> is configured to cause the pump <NUM> to receive the calibration gas from the temperature regulation assembly <NUM> and supply the calibration gas to the gas detector <NUM> for calibration. During the calibration, the calibration gas having a predetermined concentration is supplied to the gas detector <NUM>. The processor <NUM> may receive a calibration result from the gas detector <NUM> in response to the calibration gas being supplied to the gas detector <NUM>. The calibration result is indicative of actual calibration of the gas detector <NUM> achieved after the calibration gas, having the predetermined concentration, is supplied to the gas detector <NUM>. The processor <NUM> may then compare the calibration result with the predetermined concentration of the calibration gas to determine if there is an error in the calibration. In an example embodiment, the error is indicative of a difference between the actual calibration of the gas detector <NUM> and a calibration to be achieved in response to the predetermined concentration of the calibration gas. Thereafter, the processor <NUM> may cause the gas detector <NUM> to correct based on the error in the calibration.

<FIG> illustrates a flowchart for calibrating a gas detector, such as the gas detector <NUM>, in accordance with the example embodiments described herein. At step <NUM>, the gas detector calibration system <NUM> includes means, such as, the control unit <NUM>, the processor <NUM>, the temperature controller <NUM>, and/or the like, to cause the temperature regulation assembly <NUM> to modify a temperature of the ambient air. The ambient air is being supplied to the gas detector <NUM>. At step <NUM>, the temperature controller <NUM> is configured to receive a signal from the temperature sensor <NUM>. The signal is indicative of the temperature of the gas detector <NUM> after supplying the ambient air to the gas detector <NUM>.

At step <NUM>, the processor <NUM> determines if the temperature of the gas detector <NUM> is within the predefined temperature range. If the temperature is within the predefined temperature range, the valve and pump controller <NUM> is configured to open the second valve <NUM>-<NUM> to receive the calibration gas for calibration of the gas detector <NUM>, at step <NUM>.

<FIG> and <FIG> illustrate example flowcharts describing operations performed in accordance with example embodiments of the present disclosure. It will be understood that each block of the flowcharts, and combinations of blocks in the flowcharts, may be implemented by various means, such as devices comprising hardware, firmware, one or more processors, and/or circuitry associated with execution of software comprising one or more computer program instructions. For example, one or more of the procedures described above may be embodied by computer program instructions residing on a non-transitory computer-readable storage memory. In this regard, the computer program instructions which embody the procedures described above may be stored by a memory of an apparatus employing an embodiment of the present disclosure and executed by a processor of the apparatus. As will be appreciated, any such computer program instructions may be loaded onto a computer or other programmable apparatus (e.g., hardware) to produce a machine, such that the resulting computer or other programmable apparatus provides for implementation of the functions specified in the flowchart blocks. When executed, the instructions stored in the computer-readable storage memory produce an article of manufacture configured to implement the various functions specified in the flowchart blocks. Moreover, execution of a computer or other processing circuitry to perform various functions converts the computer or other processing circuitry into a machine configured to perform an example embodiment of the present disclosure. Accordingly, the operations set forth in the flowcharts define one or more algorithms for configuring a computer or processor, to perform an example embodiment. In some cases, a general-purpose computer may be provided with an instance of the processor which performs algorithms described in one or more flowcharts to transform the general-purpose computer into a machine configured to perform an example embodiment.

Accordingly, the described flowchart blocks support combinations of means for performing the specified functions and combinations of operations for performing the specified functions. It will also be understood that one or more flowchart blocks, and combinations of flowchart blocks, can be implemented by special purpose hardware-based computer systems which perform the specified functions, or combinations of special purpose hardware that execute computer instructions.

In some example embodiments, certain operations described herein may be modified or further amplified as described below. Moreover, in some embodiments, additional optional operations may also be included.

As will be appreciated by one of skill in the art, the order of steps in the foregoing embodiments may be performed in any order. Words such as "thereafter," "then," "next," and similar words are not intended to limit the order of the steps; these words are simply used to guide the reader through the description of the methods. Further, any reference to claim elements in the singular, for example, using the articles "a," "an" or "the," is not to be construed as limiting the element to the singular and may, in some instances, be construed in the plural.

In one or more example embodiments, the functions described herein may be implemented by special-purpose hardware or a combination of hardware programmed by firmware or other software. In implementations relying on firmware or other software, the functions may be performed as a result of execution of one or more instructions stored on one or more non-transitory computer-readable media and/or one or more non-transitory processor readable media. These instructions may be embodied by one or more processor-executable software modules that reside on the one or more non-transitory computer-readable or processor-readable storage media. Non-transitory computer-readable or processor-readable storage media may in this regard comprise any storage media that may be accessed by a computer or a processor. By way of example but not limitation, such non-transitory computer readable or processor-readable media may comprise RAM, ROM, EEPROM, FLASH memory, disk storage, magnetic storage devices, or the like. Disk storage, as used herein, comprises compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc™, or other storage devices that store data magnetically or optically with lasers. Combinations of the above types of media are also included within the scope of the terms non-transitory computer-readable and processor-readable media. Additionally, any combination of instructions stored on the one or more non-transitory processor-readable or computer-readable media may be referred to herein as a computer program product.

<FIG> illustrates a flow of the ambient air in a gas detector calibration system, such as the gas detector calibration system <NUM>, prior to calibration of the gas detector, in accordance with the example embodiments described herein. For flow of the ambient air, the valve and pump controller <NUM> closes the second valve <NUM>-<NUM> and the third valve <NUM>-<NUM> and opens the first valve <NUM>-<NUM> to allow flow of the ambient air from the atmospheric filter <NUM>. The ambient air flows through the first conduit <NUM>. The ambient air then enters the temperature regulation assembly <NUM> through the inlet <NUM>. The ambient air is supplied to the pump <NUM> through the outlet <NUM>, the third conduit <NUM> and the pump inlet <NUM>. Through the pump outlet <NUM> and the fourth conduit <NUM>, the ambient air flows into the chamber <NUM> for calibration of the gas detector <NUM>. In an alternative embodiment, if there is no chamber <NUM>, the ambient air is supplied to the gas detector <NUM>, the gas detector being placed adjacent to an end of the fourth conduit <NUM> supplying the ambient air.

In an example, when the temperature of the gas detector <NUM> is not within the predefined temperature range, the ambient air may be supplied to the inlet <NUM> of the temperature regulation assembly <NUM> from the chamber <NUM> through the feedback conduit <NUM>. The temperature of the ambient air is modified by the temperature regulation assembly <NUM> and is supplied to the pump <NUM>. Thereafter, the ambient air is supplied to the chamber <NUM>.

<FIG> illustrates a flow of the calibration gas in the gas detector calibration system <NUM> during calibration of the gas detector <NUM>, in accordance with the example embodiments described herein. The valve and pump controller <NUM> may close the first valve <NUM>-<NUM> and the third valve <NUM>-<NUM> and open the second valve <NUM>-<NUM> to allow flow of the calibration gas from the gas container <NUM>. The calibration gas flows through the second conduit <NUM>. The calibration gas then passes through the temperature regulation assembly <NUM> through the inlet <NUM>. The calibration gas is supplied to the pump <NUM> through the outlet <NUM>, the third conduit <NUM> and the pump inlet <NUM>. Through the pump outlet <NUM> and the fourth conduit <NUM>, the calibration gas flows into the chamber <NUM>. In an alternative embodiment, the ambient air is supplied to the gas detector <NUM> if there is no chamber. The gas detector is placed adjacent to the end of the fourth conduit <NUM> supplying the calibration gas.

In an example, when the calibration of the gas detector <NUM> is not at the desired level, the calibration gas may be supplied from the chamber <NUM> to the inlet <NUM> of the temperature regulation assembly <NUM> through the feedback conduit <NUM>. The temperature of the calibration gas is modified by the temperature regulation assembly <NUM> and is supplied to the pump <NUM>. Thereafter, the calibration gas is supplied to the chamber <NUM> for calibration of the gas detector <NUM>.

Claim 1:
A calibration system (<NUM>) for calibrating a gas detector (<NUM>) to operate at different environmental temperature conditions, the calibration system (<NUM>) comprising:
a control unit (<NUM>);
a temperature regulation assembly (<NUM>) electrically connected with the control unit, the temperature regulation assembly having an inlet (<NUM>) and an outlet (<NUM>), wherein the temperature regulation assembly is configured to:
receive ambient air through the inlet (<NUM>) of the temperature regulation assembly;
modify a temperature of the ambient air; and
supply the ambient air, having the modified temperature, to the outlet (<NUM>);
the calibration system (<NUM>) further comprising:
a pump (<NUM>) electrically connected with the control unit (<NUM>), the pump (<NUM>) having a pump inlet (<NUM>) and a pump outlet (<NUM>), wherein the outlet (<NUM>) of the temperature regulation assembly (<NUM>) is fluidly coupled to the pump inlet (<NUM>);
a temperature sensor (<NUM>) electrically connected with the control unit (<NUM>); and
a chamber (<NUM>) fluidly coupled to the pump outlet (<NUM>) of the pump (<NUM>), wherein the chamber (<NUM>) encloses the temperature sensor (<NUM>) and the gas detector (<NUM>), the temperature sensor (<NUM>) being in proximity to the gas detector (<NUM>) to measure the temperature of the gas detector (<NUM>), and wherein the chamber (<NUM>) provides a closed environment to the gas detector (<NUM>) for calibration and insulates the gas detector (<NUM>) from outside temperature;
wherein the control unit (<NUM>) is configured to:
determine whether the temperature of the gas detector (<NUM>) is within a predefined temperature range; and
calibrate the gas detector (<NUM>) in an instance in which the temperature is within the predefined temperature range.