1. An ultrasonic wave flowmeter, comprising:
a transmitter for transmitting an ultrasonic wave signal;
a receiver for receiving the ultrasonic wave signal which has been transmitted from the transmitter and has been propagated through a fluid;
a reception detecting section for receiving an output of the receiver and detecting the ultrasonic wave signal;
a delay section for receiving an output of the reception detecting section and outputting it to the transmitter so that the ultrasonic wave signal is transmitted again;
a counter for counting the number of detections by the reception detecting section;
a timer for repeatedly measuring a time period from the time when the transmission of the ultrasonic wave signal by the transmitter is started to the time when the counter reaches a predetermined value;
a calculation section for calculating a flow rate of the fluid, based on an output of the timer; and
a delay control section for controlling the delay section to change the delay time of the delay section each time the measurement by the timer is made.
2. An ultrasonic wave flowmeter according to claim 1, wherein the delay control section controls the delay section to maintain the delay time of the delay section to be constant when an output of the calculating section is greater or equal to a predetermined value.
3. An ultrasonic wave flowmeter, comprising:
a transmitter for transmitting an ultrasonic wave signal;
a receiver for receiving the ultrasonic wave signal which has been transmitted from the transmitter and has been propagated through a fluid;
a reception detecting section for receiving an output of the receiver and detecting the ultrasonic wave signal;
a first timer for measuring a time period from the time when the transmitter transmits the ultrasonic wave signal to the time when the reception detecting section detects the ultrasonic wave signal;
a second timer for measuring a time period from the time when the reception detecting section detects the ultrasonic wave signal to the time when an output of the first timer is changed; and
a calculation section for calculating a flow rate of the fluid, based on the time period measured by the first timer and the time period measured by the second timer.
4. An ultrasonic wave flowmeter according to claim 3, wherein the second timer is corrected by the first timer.
5. An ultrasonic wave flowmeter according to claim 3, further comprising a temperature sensor,
wherein the second timer is corrected by the first timer when the change in an output of the temperature sensor is greater or equal to a predetermined value.
6. An ultrasonic wave flowmeter according to claim 3, further comprising a power supply voltage sensor for detecting a power supply voltage for a circuit,
wherein the second timer is corrected by the first timer when the change in an output of the power supply voltage sensor is greater or equal to a predetermined value.
7. An ultrasonic wave flowmeter according to claim 3,
wherein the second timer is corrected by the first timer immediately after the measurement of time by the second timer.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A housing for use in a respiratory gas sampling andor delivery tubing systems comprising:
a primary Luer male connector having a form of a tapered cone, comprising a secondary female section extending from a top distal part of said primary Luer male connector back towards a proximal part thereof, wherein said primary Luer male connector comprises a first inner fluid flow channel extending along its length from a proximal end thereof to and in fluid flow connection with said secondary female section; and
a Luer female connector comprising a second inner fluid flow channel extending along the length thereof;
wherein said first inner fluid flow channel and said second inner fluid flow channel are coextensive so as to form a joined fluid flow channel having an essentially constant diameter and extending along the length of said housing;
wherein said secondary female section of said primary Luer male connector comprises a conducting material; wherein said conducting material comprises at least three conducting pads, each conductor pad separated from its neighboring conducting pad by a non-conducting gap.
2. The housing of claim 1, wherein when said primary Luer male connector mates with a primary Luer female connector, a secondary male section of said primary Luer female is at least partially inserted into said secondary female section.
3. A housing for use in a respiratory gas sampling andor delivery tubing systems comprising:
a primary Luer male connector having a form of a tapered cone, comprising a secondary female section extending from a top distal part of said primary Luer male connector back towards a proximal part thereof, wherein said primary Luer male connector comprises a first inner fluid flow channel extending along its length from a proximal end thereof to and in fluid flow connection with said secondary female section; and
a Luer female connector comprising a second inner fluid flow channel extending along the length thereof;
wherein said first inner fluid flow channel and said second inner fluid flow channel are coextensive so as to form a joined fluid flow channel having an essentially constant diameter and extending along the length of said housing; wherein said Luer female connector comprises a conducting material; and wherein said conducting material comprises at least three conducting pads, each conductor pad separated from its neighboring conducting pad by a non-conducting gap.
4. The housing of claim 3, wherein said secondary female section comprises at least three conducting pads, each conductor pad separated from its neighboring conducting pad by a non-conducting gap.
5. A housing for use in a respiratory gas sampling andor delivery tubing systems comprising:
a primary Luer male connector having a form of a tapered cone, comprising a secondary female section extending from a top distal part of said primary Luer male connector back towards a proximal part thereof, wherein said primary Luer male connector comprises a first inner fluid flow channel extending along its length from a proximal end thereof to and in fluid flow connection with said secondary female section; and
a Luer female connector comprising a second inner fluid flow channel extending along the length thereof;
wherein said first inner fluid flow channel and said second inner fluid flow channel are coextensive so as to form a joined fluid flow channel having an essentially constant diameter and extending along the length of said housing; and
wherein said Luer female connector comprises a first optical element.
6. The housing of claim 5, wherein said first optical element is arranged to optically connect with a second optical element positioned on a Luer male connector of a monitor when said Luer female connector and said Luer male connector of the monitor at least partially mate with one another.
7. The housing of claim 6, wherein said primary male Luer connector further comprises a third optical element, wherein said third optical element is arranged to optically connect with a fourth optical element positioned on a primary Luer female connector of a sampling tube when said primary Luer male connector and said primary Luer female connector of the sampling tube at least partially mate with one another.
8. The housing of claim 7, wherein said third optical element is positioned on said secondary female section.