Gas Meter

Smart Gas Metering Solutions from Texas Instruments

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Design Considerations

Gas Meter - Two-way Communication & Time Synchronized Measurement

TI provides the Low Power RF portfolio (both sub-1 GHz and 2.4 GHz solutions) that interface with a TI MCU. This type of communication enables early leak detection in gas meter end equipments as well as monitoring and customer awareness.

Gas Meter - Logging & Billing

With the implementation of flexible tariff rates it is critical to have a system where consumption information is logged. TI MCU solutions provide embedded flash technology to make this type of system a reality. In addition, TI provides solutions for anti-tamper and pre-payment RFID options for the ultimate in flexibility in today's smart gas meter solutions.

Infrastructure life-time extension
In order to optimize service frequency, battery life times in this type of application need to last 10-15 years. TI's MSP430 Ultra Low Power MCU's fit seamlessly into this thought process by combining high-performance with low power.

Gas Meter - Power

As part of maximizing battery life, the correct selection of an ultra-low quiescent current power management device is a key to optimizing the low power of the MSP430. While running the MCU directly from the battery may work (within the specified MCU operating range) and seem to save the cost of power management components, the lack of voltage regulation means much higher MCU stand-by power consumption and lower battery life. This can lead to higher maintenance costs that will far offset any cost savings observed by eliminating the regulator. Regulating the MCU and peripheral communication ICs at the lowest possible voltage will optimize power savings and lengthen battery life.

Depending on the type of battery used and the operating mode (full load) duty cycle of the gas meter, there are multiple choices in power management solutions. For simple, low duty cycle (long stand-by) applications, using batteries with a fairly flat discharge curve (such as primary cell Li-SOCl2) the use of ultra-low Iq LDOs can provide long battery life at very low cost. For higher operating duty cycle applications, the use of a low Iq DCDC regulator with power savings mode (for light loads) provides higher efficiency with a modest increase in cost.

For applications using batteries with a linear discharge curve, such as multi-cell alkaline or NiXX, the use of a low-Iq buck/boost converter will maximize battery life by providing regulation down to discharge voltages as low as 1.8-volts. For use of single-cell or small coin cell batteries, where the battery voltage can be less than the regulated voltage, the use of low-Iq boost converters can provide regulation with input voltages as low as 0.7-volts.

Although full operation of the MCU and peripheral communication ICs can be optimized at one voltage, in stand-by mode, these devices can operate at much lower voltages (simply maintaining RTC and memory). The use of DCDC converters and LDOs with dynamic voltage scaling (usually implemented with a V-Select logic pin) can further increase battery life.

Analog Sensing

The mechanical forces in gas meters can be measured/detected by various types of sensors. Because voltages are very low, precise low-noise amplifiers (for flow and temperature), and instrumentation amps (for pressure) such as the OPA2209 and INA10x, respectively, are needed at the front end. Usually the voltage is digitized with precision ADCs such as the ADS125x.

The ADS125x are precision, wide dynamic range, delta-sigma, Analog-to-Digital (A/D) converters with 18 to 24-bit resolution operating from a single +5V supply and guarantee no missing codes. They are ideal for high-resolution measurement applications like cardiac diagnostics, smart transmitters, industrial process control, weigh scales.

By supporting such features, TI enables you to prepare accurate bills, perform regular balances and reconciliation, and provide real-time usage information for optimal energy savings for gas meters and several other smart grid gas meter solutions.

Application Notes (10)

Title Abstract Type Size (KB) Date Views
HTM 8 KB 07 Sep 2012 2007
HTM 8 KB 08 Feb 2012 2618
HTM 8 KB 11 Jan 2010 2453
HTM 8 KB 16 Dec 2009 3274
HTM 8 KB 18 Sep 2009 2176
HTM 9 KB 18 Aug 2009 110
HTM 8 KB 17 Mar 2009 3127
HTM 8 KB 06 Nov 2008 2293
HTM 8 KB 31 Mar 2008 2043
HTM 8 KB 02 Jan 2008 1496

User Guides (1)

Title Abstract Type Size (KB) Date Views
pdf 510 KB 21 Aug 2012 1176
    

Reference Designs

Selection and Solution Guides

Selection Guides (4)

Title Abstract Type Size (KB) Date Views
PDF 2.83 MB 02 Apr 2014 44425
PDF 234 KB 16 Jan 2013 3608
PDF 302 KB 28 Mar 2012 3449
PDF 175 KB 11 Jun 2010 2268

Solution Guides (2)

Title Abstract Type Size (KB) Date Views
PDF 4.31 MB 15 Jan 2014 17644
PDF 409 KB 10 Jan 2011 5460

Tools and Software

Name Part # Company Software/Tool Type
CC1101 Evaluation Module 433MHz CC1101EMK433 Texas Instruments Daughter Cards
CC1101 Evaluation Module 868-915MHz CC1101EMK868-915 Texas Instruments Daughter Cards
CC1101-CC1190 869 MHz Evaluation Module Kit CC1101CC1190EMK868 Texas Instruments Daughter Cards
CC1120 Evaluation Module Kit 169MHz CC1120EMK-169 Texas Instruments Daughter Cards
CC1120 Evaluation Module Kit 420-470MHz CC1120EMK-420-470 Texas Instruments Daughter Cards
CC1120 Evaluation Module Kit 868-915MHz CC1120EMK-868-915 Texas Instruments Daughter Cards
CC1120 Evaluation Module Kit 955MHz CC1120EMK-955 Texas Instruments Daughter Cards
MSP430 868/915MHZ Wireless Target Board MSP430-3P-AWGH-AMB8423-DEVBD Amber Wireless GmbH Development Kits
SimpliciTI Compliant Protocol Stack SIMPLICITI Texas Instruments Software Libraries
SmartRF Studio SMARTRFTM-STUDIO Texas Instruments Calculation Tools

Product Bulletin & White Papers

Product Bulletin (3)

Title Abstract Type Size (MB) Date Views
PDF 120 KB 21 Jan 2014 3292
PDF 190 KB 09 Nov 2012 1686
PDF 738 KB 05 Oct 2012 3427

White Papers (2)

Title Abstract Type Size (MB) Date Views
PDF 749 KB 08 Mar 2014 1080
PDF 1.46 MB 16 Sep 2013 4356

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