Method of and apparatus for quantitative analysis
First Claim
1. A method of continuously and quantitatively determining at least one constituent of a fluid which is passed through a detector, in which a measuring signal is obtained at output terminals of the detector, which signal is a measure of the amount of constituents supplied to the detector, comprising continuously replenishing the amount of constituents to be measured in the fluid with a known amount of the constituents, supplying at least a part of the constituents of the resulting mixture to the detector, comparing the measuring signal from the detector with a reference signal and adjusting by a control device the amount of constituents supplied to the detector so as to minimize a difference between measuring signal and reference signal, the setting of the control device being a measure of the amount of constituents to be measured.
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Abstract
Method of measuring constituents in a fluid which may be gaseous or liquid, which dispenses with calibration procedures which are performed at the expense of the measuring time. The measuring apparatus is continuously supplied with a known amount of constituents from a calibration source, which calibration amount is mixed with the fluid to be measured. Subsequently, a part of the constituents of the mixture is led to a detector, and the resulting measuring signal is compared to a reference signal for adjusting a control device to ensure that the amount of constituents which reaches the detector is the correct value. The setting of the control device is an output signal useful in unattended measuring stations for water and air pollution.
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Citations
16 Claims
- 1. A method of continuously and quantitatively determining at least one constituent of a fluid which is passed through a detector, in which a measuring signal is obtained at output terminals of the detector, which signal is a measure of the amount of constituents supplied to the detector, comprising continuously replenishing the amount of constituents to be measured in the fluid with a known amount of the constituents, supplying at least a part of the constituents of the resulting mixture to the detector, comparing the measuring signal from the detector with a reference signal and adjusting by a control device the amount of constituents supplied to the detector so as to minimize a difference between measuring signal and reference signal, the setting of the control device being a measure of the amount of constituents to be measured.
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9. An apparatus for continuously and quantitatively determining at least one constituent of a fluid, comprising a detector having an inlet connected to a supply line and an outlet connected to a discharge line;
- a first fluid flow controller means in the discharge line for sustaining a fluid flow through the detector from a supply compartment, the fluid constituents to be measured producing a measuring a signal at output terminals of the detector; and
a calibration source for supplying a known amount of constituents, wherein the apparatus also comprises a control device having a reference source for a reference signal, a comparator circuit, an electrical controller and an adjusting device, a first input of the comparator circuit being connected to the output terminals of the detector, a second input being connected to the reference source, the output being connected to the input of the controller and the output of the controller being connected to the adjusting device;
the supply line comprising a first branch to which a calibration line is connected which includes the calibration source, the adjusting device comprising a second fluid flow controller, which influences the amount of constituents supplied to the detector, and wherein the first fluid-flow controller means is included in the discharge line. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- a first fluid flow controller means in the discharge line for sustaining a fluid flow through the detector from a supply compartment, the fluid constituents to be measured producing a measuring a signal at output terminals of the detector; and
Specification