User manual VAISALA PMB100

[. . . ] All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of Sale. CHAPTER 1_______________________________________________________ GENERAL INFORMATION Table of contents CHAPTER 1 GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 CHAPTER 2 PRODUCT DESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 BAROCAP® pressure sensor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CHAPTER 3 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Dimensions in mm (in inches). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Pressure calculations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Offset/Gain corrections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 CHAPTER 4 TECHNICAL DATA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Operating range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 APPENDIX A READING COEFFICIENTS FROM THE EEPROM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 VAISALA __________________________________________________________________________ 3 USER'S GUIDE_______________________________________________________________________ CHAPTER 1 GENERAL INFORMATION Safety Throughout the manual, important safety considerations are highlighted as follows: WARNING Warning denotes a serious hazard. It calls attention to a procedure, practice, condition or the like, which, if not correctly performed or adhered to, could result in injury to or death of personnel. CAUTION Caution denotes a hazard. It calls attention to a procedure, practice, condition or the like, which, if not correctly performed or adhered to, could result in damage to or destruction of part or all of the product. NOTE Note highlights important information. [. . . ] The thicker silicon layer is the rigid base plate of the sensor and it is clad with a glass dielectric. The thinner piece of silicon is electrostatically bonded to the glass surface to form a strong and hermetic bond. Thin film metallization has been deposited to form a capacitor electrode inside the vacuum reference chamber; the other electrode is the pressure sensitive silicon diaphragm. The coefficients of thermal expansion of silicon and glass materials used in the BAROCAP® pressure sensor are carefully matched together in order to minimize the temperature dependence and to maximize the long-term stability. The BAROCAP® pressure sensor is designed to achieve zero temperature dependence at 1000 hPa and its long-term stability has been maximized by thermal ageing at an elevated temperature. The BAROCAP® capacitive pressure sensor features a wide dynamic range and no self-heating effect. The excellent hysteresis and repeatability characteristics are based on the ideal spring characteristics of single crystal silicon. In the BAROCAP® pressure sensor, the silicon material is exerted to only few percent of its whole elastic range. 6 ____________________________________________________________________ M010035EN-A CHAPTER 3________________________________________________________________ OPERATION CHAPTER 3 OPERATION Connections The pin assignments of the PMB100 module are according to Figure 2. Connect 8. . . 16 VDC supply voltage (typically 2 mA) to the pin VDC and the ground plane directly to the pin GND. The output signal (0. . . 2. 5 VDC) is measured from the pin OUT and the reference signal (2. 5 VDC ± 2%) from the pin REF. If the coefficients are read from the EEPROM, the pin +5 V, SCL and SDA are also connected. The pins SCL and SDA are for data transfer between the EEPROM and a microprocessor. Temperature of the module is measured with an external T sensor, which should be placed as close to the module as possible. The module can also be switched to shut down mode by using a TTL level trigger on the pin SH. A signal 0. 7 V or lower activates and a signal higher than 2 V switches the module off. REF SH Out VDC GND + 5V SCL SDA Figure 2 Pin assignments VAISALA __________________________________________________________________________ 7 USER'S GUIDE_______________________________________________________________________ In applications where adverse electromagnetic fields exist, an additional EMI protection may be necessary. In Figure 3, there is an example of an electromagnetic interference protection of the PMB100 module. [. . . ] The offset and gain adjustments are done after the pressure calculation by the user's host system. 10 ___________________________________________________________________ M010035EN-A CHAPTER 4____________________________________________________________ TECHNICAL DATA CHAPTER 4 TECHNICAL DATA Specifications Operating range Pressure range (1 hPa = 1 mbar) Temperature range Humidity range 800 . . . +45°C < 80%RH ±0. 25 hPa ±0. 05 hPa ±0. 05 hPa ±0. 3 hPa ±0. 3 hPa ±0. 5 hPa Accuracy Linearity Pressure hysteresis Repeatability Accuracy at +20°C Temperature hysteresis Accuracy (-5°C . . . 45°C) Total accuracy after the OFFSET correction (+20 °C, 1000 hPa) performed by the user is obtained by using the following equation: Total accuracy = ± 0. 5 2 + n 2 hPa where n is the calibration uncertainty Without the OFFSET correction performed by the user: Total accuracy (-5 . . . [. . . ]