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 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 +5 V-pin is used for supply voltage of the EEPROM. 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 EMI filters should be placed as close to the pins as possible. GND directly connected to ground plane + filter filter PMB100 module GND VDC OUT REF filter Power regulator - Vout Copper pour connected to ground. Vref Vout VDC GND Vref Figure 3 Electromagnetic interference protection of the PMB100. Filters, for example, T-type EMI suppression filters with capacitance of 47pF (like Murata, DSS310-55Y5S470M100). [. . . ] +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 . . . +45 °C)±1. 00 hPa Long-term stability Effect of thermal or mechanical shocks ±0. 20 hPa/year (typical) <0. 20 hPa (5) An error of 1 °C in temperature measurement causes an error of 0. 14 hPa in pressure. General Supply voltage range 9. . . 16 VDC Shutdown control with TTL level trigger <0. 7 V module ON >2. 0 V module OFF Supply voltage sensitivity less than 0. 1 hPa VAISALA _________________________________________________________________________ 11 USER'S GUIDE_______________________________________________________________________ Current consumption operation mode shutdown mode Output voltage output reference Resolution Load resistance Load capacitance Settling time at power-up Response time Warm-up shift Pressure hose Maximum pressure limit Electrical connectors Weight 2 mA (typical) 150 µA (typical) 0. . . 2. 5 V 2. 5 V ±2% (type LM4431M3) 0. 1 hPa 10 k minimum 100 nF maximun 200 ms 100 ms less than 0. 05 hPa 1/16'' id 1/8'' OD, vinyl hose 300mm 2000 hPa two 6-pin pin headers, 2. 54 mm grid 70 g 12 ___________________________________________________________________ M010035EN-A APPENDIX A _______________________________________ READING COEFFICIENTS FROM THE EEPROM APPENDIX A READING COEFFICIENTS FROM THE EEPROM The PMB100 module has a Xicor's EEPROM memory, type X24C02, which uses the I2C interface. [. . . ]