The sensors that can be used with this board all contain signal conditioning and temperature compensation. The final calibration of a system using the SX-10506 must be done as part of the application set up. As an example, say we wish to measure the height of water in a tank to a maximum height of 8 metres. Using an SX10506 loaded with a 14.5 PSI (100kPa, 10 metres H20) sensor, we need to calibrate the system to so that the sensing system reads zero when there is no water and 1 metre when the water head is at a height of 1 metre.<\/p>\n\n\n\n
To do this, we need to take a reading with no water present (Poffset). This becomes the offset of the system. Then we take a reading with 1 metre of water (Pcal_1m). The span of the pressure measurement system is Pcal_1m – Poffset for 1 metre of water. The pressure for a given sensor reading is then:<\/p>\n\n\n\n
Water height = (PressureSensorReading – Poffset) \/ (Pcal_1m – Poffset)<\/p>\n\n\n\n
If during calibration, the reading with no water was 0.1107 (Poffset) and the reading with 1 metre of water was 0.1956 Pcal_1m, then a sensor reading of 0.6334 would give a water height of:<\/p>\n\n\n\n
(0.6334 – 0.1107) \/ (0.1956 – 0.1107) = 6.16 metres<\/p>\n\n\n\n
In practice it is always better to calibrate the system at the maximum pressure (more span), but this is not always practical. If we did calibrate at 8 metres, the equation would look like this:<\/p>\n\n\n\n
Water height = (PressureSensorReading – Poffset) \/ ((Pcal_8m – Poffset) \/ 8)<\/p>\n\n\n\n
Typically in your application program, Pcal and Poffset would be stored in non volatile memory once the calibration procedure had been done. Typically this procedure would be<\/p>\n\n\n\n
By knowing what height of water or pressure was used during the calibration procedure, the above equation can be used.<\/p>\n","protected":false},"excerpt":{"rendered":"
The sensors that can be used with this board all contain signal conditioning and temperature compensation. The final calibration of a system using the SX-10506…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1933,"menu_order":5,"template":"","class_list":["post-1944","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\n