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Table of Contents
Summary of Contents for Vaisala Barocap PMB100
- Page 1 USER'S GUIDE Vaisala BAROCAP® Barometer Module PMB100 M010035EN-A...
- Page 2 The contents are subject to change without prior notice. Please observe that this manual does not create any legally binding obligations for Vaisala towards the customer or end user. All legally binding commitments and agreements are included exclusively in the applicable supply contract or Conditions of...
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Page 3: Table Of Contents
1_______________________________________________________ G HAPTER ENERAL NFORMATION 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... -
Page 4: Chapter 1 General Information
NOTE essential procedure, practice, condition or the like. Warranty Vaisala issues a guarantee for the material and workmanship of this product under normal operating conditions for one (1) year from the date of delivery. Exceptional operating conditions, damage due to careless handling and misapplication will void the guarantee. -
Page 5: Chapter 2 Product Description
RODUCT DESCRIPTION CHAPTER 2 PRODUCT DESCRIPTION The PMB100 for OEM applications is a new circuit board mountable barometric pressure transducer that is designed to interface with an AD converter and a microprocessor. The PMB100 module is characterized over 800 to 1100 hPa (mbar) pressure range and over –5 to +45C temperature range. - Page 6 _______________________________________________________________________ UIDE reference chamber for the absolute pressure sensor and to form a pressure sensitive silicon diaphragm. 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.
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Page 7: Chapter 3 Operation
HAPTER PERATION CHAPTER 3 OPERATION Connections The pin assignments of the PMB100 module are according to Figure 2. Connect 8...16 VDC supply voltage to the pin (typically 2 mA) and the ground plane directly to the pin . The output signal (0...2.5... - Page 8 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.
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Page 9: Dimensions In Mm (In Inches)
3________________________________________________________________ O HAPTER PERATION Dimensions in mm (in inches) Pressure calculations Measure the following parameters of the PMB100 barometer module: - output voltage V - reference voltage V - module temperature T (°C) NOTE External T-sensor is required for temperature compensation purpose with minimum ±1°C accuracy. -
Page 10: Offset/Gain Corrections
_______________________________________________________________________ UIDE In pressure calculation, normalized voltage (V ) and temperature (T are required. The normalization of the parameters is performed by using the equations 1 and 2. æ ö ⋅ − ∈ − ç è − ∈ − Constant T is found in the list of coefficient or in the EEPROM Normalized pressure P... -
Page 11: Chapter 4 Technical Data
4____________________________________________________________ T HAPTER ECHNICAL DATA CHAPTER 4 TECHNICAL DATA Specifications Operating range Pressure range (1 hPa = 1 mbar) 800 ... 1100 hPa Temperature range -5°C ... +45°C Humidity range < 80%RH Accuracy ±0.25 hPa Linearity ±0.05 hPa Pressure hysteresis ±0.05 hPa Repeatability ±0.3 hPa... - Page 12 _______________________________________________________________________ UIDE Current consumption operation mode 2 mA (typical) shutdown mode 150 µA (typical) Output voltage output 0...2.5 V 2.5 V ±2% (type LM4431M3) reference Resolution 0.1 hPa Load resistance 10 kΩ minimum Load capacitance 100 nF maximun Settling time at power-up 200 ms Response time 100 ms...
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Page 13: Reading Coefficients From The Eeprom
PPENDIX EADING COEFFICIENTS FROM THE EEPROM APPENDIX A READING COEFFICIENTS FROM THE EEPROM The PMB100 module has a Xicor's memory, type X24C02, EEPROM which uses the I C interface. All the pressure and temperature related coefficients are stored in the memory in form of 32 bit, and can be read by a microprocessor (see Table 1). - Page 14 _______________________________________________________________________ UIDE The form of coefficients (32-bit signed integer) in the eeprom: eeprom: byte_0 xxxxxxxx byte_1 xxxxxxxx byte_2 xxxxxxxx byte_3 xxxxxxxx long_int: bit_31 xxxxxxxx bit_23 xxxxxxxx bit_15 xxxxxxxx bit_7 xxxxxxxx bit_0 32-bit signed integer → (1.0...-1.0) FLOAT float=signed_long_int/2^31 In following there is an example of C-program to convert the 32 bit coefficients to floating point numbers.
- Page 16 *M010035EN*...
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