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Ranarex Gas Gravitometer

Ranarex Gas GravitometerRanarex gravitometers excel over more complex and costly analyzers in total performance. The Ranarex principle and design are simple. The chassis of the gravitometer forms two cylindrical, gas-tight measuring chambers; each has a separate inlet and outlet connection. In each chamber there is an impeller and and an impulse wheel, both with axial vanes. These wheels are mounted on separate shafts, facing each other but not touching. An electric motor and drive belt rotate the impellers at the same speed and in the same direction. The impellers draw continuous flow of gas sample in the upper chamber, and reference air into the lower chamber. They spin the gas and air against the vanes of the corresponding impulse wheels. As the spinning gas and air impinge against the vanes, they create torques on the impulse wheels that are proportional to the density of the gas and of the air.

Specific Gravity
These torques are transmitted from the chambers to two external measuring wheels. A flexible tape is wrapped on the measuring wheel rims in the crossed direction so that the torque creates two opposing forces. The measuring wheels are restrained from continuous rotation, but a difference between the torques allows limited motion of the entire system. The measuring system divides the torque of the gas by the torque of the air. This is the same ratio as the density of the gas divided by the density of the air which is -- the specific gravity.

The rim of the gas measuring wheel is contoured so that it rotates through equal angles for equal changes in specific gravities. The uniform motion of the gas measuring wheel is transmitted by a link to the readout elements; these can be either an indicator, a recorder, an electronic transmitter, or high/low contacts. To ensure accuracy, the gas sample and the reference air must be measured at ambient temperature, at barometric pressure, and at equal humidity content (either humidity or dry).

Portable Gravitometer
The portable version operates on the same principle as the stationary unit but is scaled down in size and weight. No elaborate set up is required. The unit can be operated from the floor, a bench or hung from the wall and operated from a standard AC power supply or from a 12-Volt vehicle battery through a DC-AC inverter.


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