FR2814545A1 - Digital counter for displaying the amount of air sampled during a sampling period based on an analogue display meter with rotating counter wheels, the rotation of which is optically sensed and used with the digital display - Google Patents

Abstract

Meter (1), especially Gallus type meter, has a digital display (14) showing the amount of gas that has been sampled since it was last zeroed. The meter has an output in the form of counter wheels, the rotation of which is proportional to a calibrated volume of air. The meter has an infrared reflection sensor that (2) that transmits to a counter impulses representing the volume of air passing through the counter.

Description

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The present invention relates to an electronic device making it possible to display and reset the volume of air taken by a pump during air sampling on a filter for analysis.

 The volume of air sampled, for a period ranging from one hour to several days, must be precisely indicated to the laboratory in charge of the analysis.

 The air volume reading is traditionally indicated by the casters of a Schlumberger Gallus type mechanical gas meter without resetting possible.

 It is therefore necessary to read the volume indicated by the meter at the start of the sample and then at the end of the sample to subtract the latter by the first.

- Le système peut être alimenté avec un ensemble de piles sans nécessité de composants autres que deux résistances et le couple capteur type HOA./ Compteur totalisateur. The device according to the invention overcomes this drawback. The electronic counter has a reset button which can be used at the start of air sampling, the total air volume withdrawn will then be directly that read at the end of sampling. It includes a Gallus 2000 Schlumberger counter allowing, as before, to count the air passing through it, the wheel indicating the unit of liters is then fitted with reflective bands on each figure while the intermediate portions are painted in black. An opto-electronic sensor is then grafted in front of the modified caster while an electronic totalizing counter counts the pulses transmitted by the passage of a reflective strip in front of the Diode IRJPhoto-Transistor couple formed by the reflection sensor.
According to the particular embodiments:

- The system can be supplied with a set of batteries without the need for components other than two resistors and the sensor couple type HOA./ Total counter.

- The system can be equipped with an electronic card connected to the mains allowing the electrical supply of the sensor only and the transmission of the pulses sent to the meter by the phototransistor.

The system can be equipped with an electronic card connected to the mains allowing the electrical supply of the sensor and the meter

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 - The casing of the wheel used for counting can be a set of reflective adhesive strips for each number (Aluminum tape). with black paint on intermediate areas.

- The casing of the wheel used for counting can be a single strip of transparent plastic, of length equal to the circumference of the drum on which we will have printed black bands representing the intermediate areas of the drum figures and then glued a strip of tape adhesive aluminum, the strip then being presented turned over.

 - The sensor can be positioned directly in front of the wheel counting the units on the Gallus counter, the latter being covered with a set of 10 reflective strips and 10 blackened areas.

 The sensor can be positioned in front of a caster fitted with a casing comprising 12 reflective bands and 12 black bands of manufacture other than that supplied with the Gallus, which itself is placed above the only cost-effective wheel emerging from the metallic part of the Gallus once the mechanical counting part removed from the counter.

 The accompanying drawings illustrate the invention.

Figure 1 shows in section on the right, the device of the invention with the sensor fixed in front of the liter wheel on the mechanical part of the meter.

Figure 2 shows from the front, the device with the sensor in front of a manufacturing wheel other than those supplied with the original Gallus counter. The mechanical counting part supplied with the Gallus being removed. Figure 3 shows in the form of a structural diagram the electronic card supplying the IR reflection sensor and transmitting the pulses to the counter. reflection 1 R and transmitting the pulses to the counter
With reference to these drawings, the device comprises a gas meter (1), to which an infrared reflection sensor (2) has been added placed in front of a caster driven by the mechanical gear system of the Gallus meter.

 The roller (3) is fitted with reflective strips placed at intervals representing 1 liter of air counted by the Gallus (1).

 The number of reflective strips present on the caster (3) is 10 if you use the liter caster existing on the complete Gallus (1) and 12 if you use the

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 internal gear wheel of the Gallus stripped of its mechanical accounting part (4).

 On the electronic assembly, the supply part (5) is equipped with a 2x12V 6Va transformer (6) as well as a rectifier diode bridge (7), a 100elf smoothing capacitors (8), 2 suppressor capacitors 1001! F (9 and 10), a 12V regulator (11) and a 5V (12).

 With the 12V voltage source, the phototransistor (13) is supplied and the pulses produced are transmitted to the totalizing counter (14). With the 5V voltage source and by means of the divider bridge (15), the supply voltage of the infrared diode (16) is produced. The pulse height is adjusted by varying the supply voltage of the diode (16) by means of the potentiometers (17 and 18). Experience shows that with a HOA 1405 sensor (2) and a HED-261-B totalizer counter (14), a voltage of 1.2 V obtained under load is necessary to have the tilt levels corresponding to the desired operation with the resistors polarization 9 and 20) of the phototransistor (13) recommended by the manufacturer The printed circuit (fig4) shows the location of the components described above.

 The device according to the invention is particularly intended for the volumetric reading of gas.

Claims (7)

 1) Device giving a volume of air taken from a digital display (14) characterized by the use of a Gallus type meter (l) or any other gas meter having an outlet in the form of a toothed wheel or not and whose revolution being proportional to a calibrated air volume 2) Device according to claim 1 characterized in that it comprises an infrared reflection sensor (2) transmitting to an electronic totalizing counter equipped with a reset (14) of the pulses representing the passage of a volume of air calibrated through the counter (1).  3) Device according to any one of the preceding claims, characterized in that it is powered only by means of a set of batteries and resistors.  4) Device according to any one of the preceding claims, characterized in that it is supplied by means of an electronic card supplying the supply of the diode I. R. (16) and the Photo-transistor (13).  5) Device according to any one of the preceding claims, characterized in that it is supplied by means of an electronic card supplying the phototransistor (13).  6) Device according to any one of the preceding claims, characterized in that it is supplied by means of an electronic card providing the transmission of the pulses to the electronic totalizing counter (14).  7) Device according to any one of the preceding claims, characterized in that it is supplied by means of an electronic card supplying the supply to the totalizing counter (14).