Direct reading quantitative gas measuring device

Claim 2

In a device for determining the amount of a gaseous constituent in a mixed fluid of known salinity at a known altitude and providing a direct reading of the quantitative amount of such constituent including: a gas sensor providing an output variable according to the partial pressure of the constituent in the fluid, amplifier means for receiving the signal from said sensor,

Claim 3

A device as defined in claim 1, including a salinity scale adjustable with respect to said second temperature scale as said first compensating means is adjusted to compensate the indicated output for solubility changes due to variations in the salinity of the fluid.

Claim 4

In a device for determining the amount of oxygen in a mixed fluid at a known altitude and providing a direct reading of the concentration of such oxygen including: a polarographic cell providing an output signal variable according to the partial pressure of the oxygen in the fluid, electronic amplifier means for receiving the signal from said cell, a meter driven by said amplifier means including a first temperature scale and an oxygen concentration scale, a thermistor arranged to respond to the temperature of the fluid to which said cell is exposed, means for selectively connecting the output of said thermistor or the output of said cell or both of said outputs to said amplifier means in order to measure selectively the temperature of said fluid when the thermistor alone is connected or to measure said oxygen concentration, compensated for temperature variations in said cell output, when both said sensors are connected, the improvement comprising: an indicator driven by said amplifier means including temperature and constituent concentration scales, a temperature sensor arranged to respond to the temperature of the fluid to which said gas sensor is exposed, said temperature sensor having a resistance/temperature characteristic suitable for compensating the gas sensor output for variations in the temperature of the fluid, means for selectively connecting the output of said temperature sensor or the output of said gas sensor or both of said outputs to said amplifier means in order to measure selectively the temperature of said fluid when the temperature sensor alone is connected or to measure said constituent concentration, comPensated for temperature variations, when both said sensors are connected, the improvement comprising: a first adjustable compensating means including a second temperature scale corresponding in range to the indicator temperature scale arranged in circuit with said indicator for compensating the gas sensor output for variations in the constituent solubility in the fluid due to changes in the indicated temperature when said temperature sensor and said gas sensor are connected to compensate for temperature variations in the gas sensor output, and a second adjustable compensating means arranged in circuit with said indicator for compensating the gas sensor output for variations in the constituent solubility in the fluid due to pressure changes at said known altitude and an altitude scale on said indicator, whereby said indicator may be adjusted to show the appropriate altitude on said altitude scale when said temperature sensor and said gas sensor are connected to compensate for temperature variations in the gas sensor output. a compensating circuit including a first adjustable element arranged to be preset for compensating the output of said meter according to changes in the solubility of the oxygen in the fluid with changes in temperature when said thermistor and said cell are connected to compensate for temperature variations in the cell output, an adjustable dial connected to said first adjustable element, a second temperature scale cooperating with said dial to provide adjustment of said adjustable element according to the indication of said meter on said first temperature scale, and a second adjustable compensating means arranged in circuit with said indicator for compensating the cell output for variations in the oxygen solubility in the fluid due to pressure changes at said known altitude and an altitude scale on said indicator, whereby said indicator may be adjusted to show the appropriate altitude on said altitude scale when said thermistor and said cell are connected to compensate for temperature variations in the cell output.

Claim 5

In a device for determining the amount of oxygen in a mixed fluid at a known altitude and providing a direct reading of the concentration of such oxygen including: a polarographic cell providing an output signal variable according to the partial pressure of the oxygen in the fluid, electronic amplifier means for receiving the signal from said cell, a meter driven by said amplifier means including a first temperature scale and an oxygen concentration scale, a thermistor arranged to respond to the temperature of the fluid to which said cell is exposed, means for selectively connecting the output of said thermistor or the output of said cell or both of said outputs to said amplifier means in order to measure selectively the temperature of said fluid when the thermistor alone is connected or to measure said oxygen concentration, compensated for temperature variations in said cell output, when both said sensors are connected, the improvement comprising: an indicator driven by said amplifier means including temperature and constituent concentration scales, a temperature sensor arranged to respond to the temperature of the fluid to which said gas sensor is exposed, said temperature sensor having a resistance/temperature characteristic suitable for compensating the gas sensor output for variations in the temperature of the fluid, means for selectively connecting the output of said temperature sensor or the output of said gas sensor or both of said outputs to said amplifier means in order to measure selectively the temperature of said fluid when the temperature sensor alone is connected or to measure said constituent concentration, comPensated for temperature variations, when both said sensors are connected, the improvement comprising: a first adjustable compensating means including a second temperature scale corresponding in range to the indicator temperature scale arranged in circuit with said indicator for compensating the gas sensor output for variations in the constituent solubility in the fluid due to changes in the indicated temperature when said temperature sensor and said gas sensor are connected to compensate for temperature variations in the gas sensor output, and a second adjustable compensating means arranged in circuit with said indicator for compensating the gas sensor output for variations in the constituent solubility in the fluid due to pressure changes at said known altitude and an altitude scale on said indicator, whereby said indicator may be adjusted to show the appropriate altitude on said altitude scale when said temperature sensor and said gas sensor are connected to compensate for temperature variations in the gas sensor output. a compensating circuit including a first adjustable element arranged to be preset for compensating the output of said meter according to changes in the solubility of the oxygen in the fluid with changes in temperature when said thermistor and said cell are connected to compensate for temperature variations in the cell output, an adjustable dial connected to said first adjustable element, a second temperature scale cooperating with said dial to provide adjustment of said adjustable element according to the indication of said meter on said first temperature scale, and a second adjustable compensating means arranged in circuit with said indicator for compensating the cell output for variations in the oxygen solubility in the fluid due to pressure changes at said known altitude and an altitude scale on said indicator, whereby said indicator may be adjusted to show the appropriate altitude on said altitude scale when said thermistor and said cell are connected to compensate for temperature variations in the cell output.