Thank you for purchasing the Smart Wireless Absolute Gas Pressure Sensor. We pride ourselves on producing high quality products that meet with the demands of the busy classroom environment. If you have any problems using this sensor, please read this documentation in full before contacting the Data Harvest support team.


Overview
The Smart Wireless Absolute Gas Pressure Sensor is USB and Bluetooth compatible. Using Bluetooth, a sensor can connect to mobile devices, tablets, laptops and desktops.   


The Absolute Gas Pressure Sensor has a single measurement port that measures the total pressure on a system relative to a calibrated absolute zero pressure. When the single port is left open, the sensor will measure atmospheric pressure. For example, if a syringe (for Boyles law practical) is connected to the sensor, and the plunger pushed to give a reading of 300 kPa, it means that the measured pressure is 300 kPa, not that we have added 300 kPa of pressure. The range is 0 to 400 kPascals (kPa), atmospheric pressure is global average of 101.3 kPa at sea level. 


The sensing element of the Gas Pressure Sensor is piezoresistive: when a stress or strain is applied to the sensor, it changes the resistance to the flow of current. The change in resistance is proportional to the stress, and the stress is created by the pressure acting on the sensor. The sensor’s electronics have temperature compensation to minimise the effect of ambient temperature changes to the sensor and electronics.   


The connector on the Gas Pressure Sensor is a female Luer lock (screw) type open-flow style. If a shut off is required, a tap will need to be fitted. Data Harvest have a kit of valves, adapters, tubing etc, which is in the Gas Pressure Accessory Kit (1149). 


The female hub has a half turn lock into threads on a male Luer fitting. Luer lock couplings are a standardised system for making leak-free connections between two fittings e.g. female to male fitting. The female connector on the sensor is made for nylon and will become slack with repeated use and overtightening. We recommend the use of one of the male connectors supplied, and length of tubing to take the use away from the connector to a user replaceable connection.