Vaisala Barocap PMB100 User Manual Download Page 9

Page: 9 / 16

HAPTER

3________________________________________________________________ O

PERATION

AISALA

__________________________________________________________________________ 9

Dimensions in mm (in inches)

Pressure calculations

Measure the following parameters of the PMB100 barometer module:

- output voltage

out

- reference voltage

ref

- module temperature

(°C)

NOTE

External T-sensor is required for temperature compensation purpose
with minimum ±1°C accuracy.

1°C error in temperature measurement causes 0.14 hPa error in
pressure value.

Summary of Contents for Barocap PMB100

Page 1: ...USER S GUIDE Vaisala BAROCAP Barometer Module PMB100 M010035EN A...

Page 2: ...echanical including photocopying nor may its contents be communicated to a third party without prior written permission of the copyright holder The contents are subject to change without prior notice...

Page 3: ...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 calc...

Page 4: ...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...

Page 5: ...All the user needs to do is to measure the temperature of the module and the two voltage outputs and then calculate the compensated pressure reading using the coefficients A final offset correction a...

Page 6: ...er 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 orde...

Page 7: ...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 pin...

Page 8: ...c interference protection of the PMB100 module The EMI filters should be placed as close to the pins as possible Power regulator Vout filter filter filter GND Vref PMB100 module Copper pour connected...

Page 9: ...____ 9 Dimensions in mm in inches Pressure calculations Measure the following parameters of the PMB100 barometer module output voltage Vout reference voltage Vref module temperature Tm C NOTE External...

Page 10: ...he EEPROM Normalized pressure Pn is calculated according to the equation 3 All the module specific coefficients are available in the list of coefficients supplied with each module or in the EEPROM 1 1...

Page 11: ...is 0 3 hPa Accuracy 5 C 45 C 0 5 hPa Total accuracy after the OFFSET correction 20 C 1000 hPa performed by the user is obtained by using the following equation Total accuracy hPa n2 2 5 0 5 where n is...

Page 12: ...pical shutdown mode 150 A typical Output voltage output 0 2 5 V reference 2 5 V 2 type LM4431M3 Resolution 0 1 hPa Load resistance 10 k minimum Load capacitance 100 nF maximun Settling time at power u...

Page 13: ...tailed instructions of the EEPROM are found on Xicor s web pages http www xicor com NOTE EEPROM can not be read if the shut down is active ON Table 1 EEPROM memory map Name Symbol Type Length Memory a...

Page 14: ...t_0 MSB LSB 32 bit signed integer FLOAT 1 0 1 0 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 unsigned char read...

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Page 16: ...www vaisala com M010035EN...