FR2715223A1 - Portable testing device for gas sensor - Google Patents

Abstract

The device includes a container (1) filled with a gas suitable to be detected by the sensor being tested and connected to a balloon (6). The gas is transferred into the balloon where it reaches the room temperature and a low pressure. A diffuser (8) is attached to the balloon output and coupled to the gas sensor thus ensuring dispersion of the gas over the sensor. If the sensor is functional is should detect the gas and generate a signal.

Description

OPERATION MONITORING DEVICE
GAS DETECTION CELLS
Technical field: security, detection and analysis of gases in all places where they can be accumulated or measured.

Solution provided: expose the detector cell to a calibrated gas to verify the triggering of the detector cell while remaining below the dangerous threshold (asphyxiation, explosion).

Currently, the system used consists of a high pressure standard bottle, filled with a specific gas, a pressure reducer assembly, a hose and an adapter.

Weight: about 30 kg
Price: 6,500.00 Francs.

Consequence: no control.

We offer a very light device: around 80 grams, inexpensive, 100% reliable.

Presentation - A pressurized container (aerosol) filled with gas to which the detector cell must be sensitive. This container complies with the legislation.

- A transfer flask allowing the gas which stays there to reach room temperature and a very low pressure. Indeed, it turns out that the projection of the gas directly from the container onto the cell appreciably modifies the characteristics of the latter by the cold resulting from the expansion of the gas to a pressure of 8/10 bar at atmospheric pressure.

- A diffuser making it possible to adapt, without tools and in a sealed manner, to the detection cell, thus ensuring the dispersion of the calibrated gas on the cell.

Industrial application
If this device does not innovate in the nature of the various components used, it innovates in the extreme ease of use and will find its use in all the places where gases can accumulate in a dangerous way, being able to cause several types of incidents, some of which could be very serious:
- underground parking lots (CO)
- cold rooms (freon, ammonia)
- boiler rooms (methane)
- premises located in hazardous environments (gas storage, chemical plant, refinery of
oil, etc.).

Mode of use - Adapt the diffuser (8) on the detector cell.

- Fill the transfer flask (6) with gas by pressing on the valve (2) of the container.

- If the cell is in good condition, the device measured must indicate the presence of gas or trigger
a signal.

 Otherwise, the cell must be replaced immediately (by others than us).

The accompanying drawing illustrates the invention.

With reference to this drawing, the invention comprises -1 'aerosol; - the aerosol valve (2); - the transfer nozzle (3); - the transfer tube (4); - the non-return valve (5); - the transfer ball (6); - the shut-off valve (7) - the diffuser (8).

The capacity of the container being 75 ml of diluted gas, the gas released during the test does not present any risk. Active gas concentrations are in the range of 200 to 15,000 PPM of air, depending on the gas.

Claims (1)

1) Device for checking the operation of the gas detection cells, characterized  in that it comprises an aerosol (1) filled with the control gas linked to a transfer flask (6) and  to a diffuser (8) intended to adapt to the detector cell.