Description
Diaphragm gas meter with temperature and pressure corrector (ETC, ETPC)
Diaphragm gas meters with temperature and pressure corrector operate similar to the diaphragm gas meters. The diaphragm gas meter is one of the products which is manufactured by Gas Souzan company in different sizes from G4 to G160. The ETC gas meter is equipped with a temperature sensor and the ETPC gas meter is not only equipped with a pressure sensor but also with the temperature sensor. In order to standardize the consumption volume, temperature and pressure sensor are used in the gas meters. The ETC gas meters are used where gas pressure is low such as household applications, but the ETPC gas meters are used where gas pressure is high such as industrial applications.
In order to digitally display the amount of consumption, temperature and other parameters, a box is added under the mechanical counter of diaphragm meter, which includes an electronic board and a battery.
The diaphragm gas meter measures the volume of passing gas in atmospheric conditions, while the tariffs approved by the authority are defined based on standard conditions. It should be noted that the temperature of the gas passing through the gas meter varies during the day and night and during different seasons; Therefore , the temperature must be read instantly by the temperature sensor. But the pressure for domestic use in a place is almost constant and low, and it can be stored as a parameter that can be set in the processor of the electronic board. Add pressure to the meter.
In order to convert the actual volume to the standard volume, there is the electronic board inside ETC gas meter which reads the temperature from the temperature sensor and the pressure from the parameter stored in the electronic board processor and performs the calculations, but for the ETPC gas meter, the temperature and pressure are read from the sensors to calculate the standard volume.
In addition to standardizing the consumption volume, the electronic board has three other important tasks:
- Identification of unauthorized manipulations of the gas meter, such as, gas meter electronic box is unsealed, using a magnet, etc.
- Storing the information of gas meter, including consumption and events, in the stable memory of the board for future reference.
- Digital display of consumption, temperature, alarms, etc. on the gas meter.
Selection of electronic components, circuit board design, microcontroller coding is complicated and time-consuming due to limitations such as the available space in the board, power losses and in compliance with the ATEX design. But the result is a product with the following capabilities, which are important for National Iranian Gas Company.
– Designing low-power circuit the typical estimated life of a A4 Lithium is about 10 years
– using several types of sensors to identify manipulation actions and reduce the possibility of gas manipulation.
– Converting the volume of consumed gas to the standard volume / calculating the cost of gas consumption.
– The design of circuit based on requirements of ATEX design , safe use of this gas meter in domestic, commercial and industrial uses.
The used gas meters can be of the diaphragm type with a mechanical counter that has the ability to send pulses through a magnet embedded in the least valuable digit of the gas meter, which is in accordance with the latest version of the standard IGS-M-IN-101 and EN1359 is made.
The functioning of changing the consumed volume of these gas meters is that the above board has a Read Switch that produces a pulse that is equivalent to the volume of gas passing through the meter as soon as the mechanical counter magnet reaches its position. . The above pulse is processed in the microcontroller board and then corrected with the temperature measured by the temperature and pressure sensor read from the processor board or measured by the pressure sensor, according to the EN12405 standard.
The above electronic board is powered by a lithium battery with a lifespan of at least 10 years without the need for replacement. It is also equipped to a LCD screen with very low power to display the uncorrected index (digital number of mechanical counter) and the corrected of gas meter. At the same time, the alarms related to battery and manipulation, etc. can be displayed on this screen.
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