User`s Manual Model 7150 Series Digital Barometer
Contents
1. ER ER 3 2 9 2 5 3 2 9 5 1 3 8 lol olol1 1 0 0 7150 A Pressure Sensor 1 reading indicates missing or out of range this is a Model 7150 A barometer Pressure Sensor 2 reading 32 925 inHg this is a Model 7150 A barometer Pressure Sensor 3 reading 32 951 inHg this is a Model 7150 A barometer Temperature is 38 C Trend 0 001 inHg over past 3 hours Pressure Sensor 1 has a problem no errors in Pressure Sensor 2 and Pressure Sensor 3 Model 7150 Series Digital Barometer User s Manual x x x x ALL Barometer has just been powered up this response is sent in response to a poll only for the first 10 seconds or so until the sensor has stabilized subseguent polls will be responded to with normal data 3 1 2 Boot Counter The barometer keeps track of the number of times it has reset as a result of a watchdog timeout or a power off on cycle since the last time the boot counter was cleared This allows the user to know whether the barometer has been rebooting resetting on a regular basis The command to retrieve the number of resets since the last time the counter was cleared is BOOT lt CR gt lt LF gt The barometer will respond with the numbe2. Serial CONNECIONS ienratacianticdeo soda Tu cias oh FWYD Lace HYNY TE du YF ND Cwn NN DF sis 8 4 4 Power Supply Conmections miccional ic rienda cias 8 A A O O 8 5 MAINTENANCE Ie ddad dT Go Ga ddi o bie 9 5 1 Periodic Maintenance Schedule ircen annaa a a aa ai 9 51 1 Monthly Maintenance cnn teina a rr Do DOD CG a ia 9 5 1 2 Triannual Maintenance 0 0 0 0 ccccccsesscececcceeeesessaecececeeeceesssseseeeccesesesenseaeeeseeeesenes 9 5 1 3 Annual Maintenanc amp ue Y Yg DW NG Bl Y 9 52 Maintenance Procedures eiu nd ia 9 3 241 Eguipment REUS e Gn a YU Cg Ub RD E 9 5 2 2 Debris Obstruction Removal cccnnonoooononncncononnnaononononocnononnnnonononcocononnnnononnnnnccnonnnns 9 5 2 3 Quad Plate Pressure Port Vent Cleaning if equipped oooooccnoccconcccnoonccononccinnnncnnnos 10 5 2 4 Barometric Pressure Check rasini ea a aa a aA a at 10 5 2 5 Barometric Pressure Offset AWOS systems ONly oooonoococnoncccconcccnnnccononccnnananinnos 10 5 2 6 Altimeter Setting Check AWOS systems only ocooococnoccccnonccnonncnnonnccnnanaconnnccnnnos 10 05 PECIFIDA TON Sian 11 7 ELECTROMAGNETIC COMPATIBILITY E 12 O A AN A A TN OA A NR RAA A NN TOO 13 Model 7150 Series Digital Barometer User s Manual 1 OVERVIEW The Model 7150 Series of digital barometers is designed to provide accurate pressure measurements over a wide range of environmental temperatures and pressures The fully compensated digital barometer is ideal for use in
3. BP GND lug to chassis GND lug Figure 3 Connect BP Sensor Ground Lug to Chassis Ground Figure 4 shows the mounting specifications for the 7150 Digital Barometer 120 mm 104 mm E q 6 5 mm 1 8 I D x 1 4 O D pressure fittings connect tubing here 120 mm 7 145 mm 133 mm DB9 female Figure 4 7150 Digital Barometer Mounting Specifications Model 7150 Series Digital Barometer User s Manual 4 2 PRESSURE CONNECTIONS The barometer is equipped with a barbed pressure fitting for 1 8 internal diameter tubing The barbed pressure fitting is not recommended for turbulent or high speed static wind conditions the accuracy quoted for the 7150 Series Digital Barometers does not include any wind effects The pressure fitting must also be carefully protected from rain to keep water from getting into the pressure connector where it may cause errors in the pressure measurement 7150 Series Digital Barometers are designed to measure the pressure of gases that are clean non condensing non conducting and non corrosive 4 3 SERIAL CONNECTIONS Figure 5 shows the wiring diagrams for the RS 232 and RS 485 serial communication options The RS 232 option has no hardware handshaking RS 232 TX 2 RS 485 6 RS 232 RX o Zs 485 ns GND 5 GB Figure 5 7150 Digital Barometer Serial Connection Wiring Options Both the RS 232 and the RS 485 serial ports are available on the DB9 serial interface but only
4. al el x olo 7150 Pressure Sensor 1 reading 29 932 inHg Pressure Sensor 2 reading 29 935 inHg Pressure Sensor 3 reading indicates missing this is a Model 7150 barometer Temperature is 25 C Trend indicates barometer has been operating for less than 3 hours No errors in Pressure Sensor 1 or Pressure Sensor 2 Pressure Sensor 3 is missing this is a Model 7150 barometer 3 0 4 3 2 30 4 2 5 30 4 2 9 37 0 0 0 7 0 0 1 7150 A Pressure Sensor 1 reading 30 432 inHg Pressure Sensor 2 reading 30 425 inHg Pressure Sensor 3 reading 30 429 inHg this is a Model 7150 A barometer Temperature is 37 C Trend 0 007 inHg over past 3 hours No errors in Pressure Sensor 1 or Pressure Sensor 2 Pressure Sensor 3 has a problem 2 1 jojo ojo 2 JO 7150 B Pressure Sensor 1 reading 29 836 inHg Pressure Sensor 2 reading indicates missing this is a Model 7150 B barometer Pressure Sensor 3 reading indicates missing this is a Model 7150 B barometer Temperature is 21 C Trend 0 002 inHg over past 3 hours No errors in Pressure Sensor 1 Pressure Sensor 2 and Pressure Sensor 3 are missing this is a Model 7150 B barometer
5. e Perform the monthly maintenance visual check of the Quad Plate Pressure Port if equipped and clear any debris from the Quad Plate Pressure Port or transducer area e Clean the Quad Plate Pressure Port vents s if Quad Plate Pressure Ports are used e Perform a barometric pressure check e Enter the offset s for the barometric pressure sensors if the barometer is being used in an AWOS system 5 1 3 Annual Maintenance e Perform the procedures outlined for triannual maintenance e Perform an altimeter setting check if the barometer is being used in an AWOS system 5 2 MAINTENANCE PROCEDURES 5 2 1 Eguipment Reguired The following eguipment is reguired for the 7150 Series Digital Barometers maintenance procedures e Setra Model 370 pressure standard or equivalent All Weather Inc P N Z003919 5 2 2 Debris Obstruction Removal Visually check the Quad Plate Pressure Port 1f equipped and clear any debris from the Pressure Port or transducer area Model 7150 Series Digital Barometer User s Manual 5 2 3 Quad Plate Pressure Port Vent Cleaning if equipped 1 Remove the Quad Plate Pressure Port drain plug the Phillips screw on the underside of the bottom plate using a Phillips screwdriver and drain any accumulated moisture 2 Remove both flexible tubes from the transducer inlets and blow gently into the tubes to clear any accumulated debris 3 Replace the tubes and the Quad Plate Pressure Port drain plug 5 2 4 Barometric P
6. one communication protocol is normally used Fail safe biasing ensures that there is no interference from the unused serial port regardless of whether termination and bias resistors are used 4 4 POWER SUPPLY CONNECTIONS Figure 6 shows the wiring diagram for the power supply connections The power supply is connected using the same DB9 connector that is used for serial communication Figure 6 7150 Digital Barometer Power Supply Wiring 4 5 CHECKOUT Check the device the barometer is connected to verify that barometric pressure data are being output corresponding to the number of pressure transducers or model of the 7150 Series Digital Barometer No further checks are reguired when the barometer is first installed Subseguent maintenance checks must be done based on the schedule described in Chapter 5 Model 7150 Series Digital Barometer User s Manual 5 MAINTENANCE The routine maintenance described in this chapter must be performed according to the schedule presented in Section 5 1 using the maintenance procedures described in Section 5 2 5 1 PERIODIC MAINTENANCE SCHEDULE Periodic maintenance procedures for the 7150 Series Digital Barometers are divided into three categories within the maintenance cycle monthly triannual and annual maintenance 5 1 1 Monthly Maintenance e Visually check the Quad Plate Pressure Port if equipped and clear any debris from the Pressure Port or transducer area 5 1 2 Triannual Maintenance
7. x ON ON ON x PROG x x x x x x OFF x The communication protocol uses 8 data bits no parity and one stop bit 8 N 1 for all baud rates and is not selectable by the user Model 7150 Series Digital Barometer User s Manual All commands sent to the barometer must end in a carriage return 0x13 and line feed 0x10 The barometer will output an identification message out of its serial port upon being powered up This identification message will include the software version as shown in the example below 7150 BP Sensor Firmware Version 1 00 3 1 1 Sensor Polling The sensor only outputs its data stream after receiving a poll command The poll command for the barometer is SEND 0 lt CR gt lt LF gt The poll response with the calibration coefficients applied appears below lt SP gt lt SP gt aa aaa lt SP gt bb bbb lt SP gt cc ccc lt SP gt tt lt SP gt xx xxx lt SP gt yyy lt SP gt Empty space aa aaa Pressure Sensor 1 bb bbb Pressure Sensor 2 cc ccc Pressure Sensor 3 XX XXX 3 hour pressure trend tt Temperature associated with Pressure Sensor 1 lt gt Empty space for positive temperature reading or minus sign for negative temperature reading yyy Error code one character for each pressure sensor Pressure values are output in inches of mercury inHg Temperature is output in degrees Celsius C These values are each averaged over 5 seconds A minus sign pr
8. 6 928 1165 Contact Customer Service e Phone support is available from 8 00am 4 30pm PT Monday through Friday Call 916 928 1000 and ask for Service e Online support is available by filling out a request at www allweatherinc com support online support e E mail your support request to support allweatherinc com Model 7150 Series Digital Barometer User s Manual Revision History Revision Date Summary of Changes Clarified description of boot counter operation rotated mounting diagram in Figure 4 to c 2012 Jan 6 match photo in Figure 3 matched dimensions in specifications to those in Figure 4 corrected year of EN61326 1 2006 report to 2005 adapted warranty to match FAA Advisory Circular 150 5220 16D Section 2 4 h p 12 D 2014 Apr 4 Added non default baud rates to specifications to match options described in Chapter 3 Model 7150 Series Digital Barometer User s Manual TABLE OF CONTENTS TOE PAM EW Wiis vacua nds cade AAA i 1 1 1 Data Collection Platform Kit Options ui cvciessccssccvsdencecascassecdacea ches GAFN AD WY DO GYR O NW O DD del 1 2 THEORY OF OPERATION o LG WG GG Cd Cd GG CG 2 2 1 Pressure TAO UC E nei A Ra DT Tdd YG a 2 O d i o NON rana WR I RT rat 3 3 1 Communication rn dd DU apa iii 3 E OT 4 3 1 2 Boot Connteb tt ii 6 ING FAELAEION Se CHECKOUT a RY Y Y Y YR 7 BT NODIR Gu CR lata O OCS GR GR OO On 7 4 2 Pressure ConrnectiOll u 1i ie nu ai ay O O REINS 8 4 3
9. Model 7150 Series Digital Barometer 2 ce o RIN so 1 450 ew xxv one aon gt aa 5 an so e User s FAA APPROVED Manual E FAA APPROVAL PENDING Rev D NOT FAA APPROVED allweatherinc All Weather Inc 1165 National Drive Sacramento CA 95834 USA 800 824 5873 www allweatherinc com Copyright O 2012 2014 All Weather Inc All Rights Reserved The information contained herein is proprietary and is provided solely for the purpose of allowing customers to operate and or service All Weather Inc manufactured equipment and is not to be released reproduced or used for any other purpose without written permission of All Weather Inc Throughout this manual trademarked names might be used Rather than put a trademark TM symbol in every occurrence of a trademarked name we state herein that we are using the names only in an editorial fashion and to the benefit of the trademark owner and with no intention of infringement All Weather Inc and the All Weather Inc logo are trademarks of All Weather Inc Disclaimer The information and specifications described in this manual ate subject to change without notice Latest Manual Version For the latest version of this manual see the Product Manuals page under Reference on our web site at www allweatherinc com 79 aliweatherinc All Weather Inc 1165 National Drive Sacramento CA 95834 Tel 916 928 1000 Fax 91
10. demanding automated weather station applications The barometers use pressure transducers with silicon peizoresistive absolute pressure sensors The pressure sensors have excellent hysteresis and repeatability characteristics low temperature dependence and a very good long term stability The ruggedness of the pressure transducers is outstanding Three models are offered based on the number of pressure transducers in the digital barometer Additional pressure transducers allow for operational redundancy and can be used by a system incorporating the digital barometer as a basis to flag the digital barometer for maintenance or replacement if the difference in readings between transducers exceeds a predefined amount Model Number Eid 7150 2 7150 A 3 7150 B 1 The 7150 digital barometer which has two pressure transducers is the standard digital barometer recommended for Automated Weather Observing Systems AWOS The digital barometers communicate using full duplex RS 232 and half duplex RS 485 serial protocols Both the RS 232 and the RS 485 serial ports are available on the DB9 serial interface but only one communication protocol is normally used Fail safe biasing ensures that there is no interference from the unused serial port The 7150 Series of digital barometers is traceable to National Institute of Standards and Technology NIST in the United States 1 1 DATA COLLECTION PLATFORM KIT OPTIONS The Model 7150 Seri
11. ecedes the temperature value if the temperature reading is less than 0 C The 3 hour pressure trend is based on 5 minute averages This value will be reported as until the barometer has accumulated 3 hours of data The trend will show the increase or decrease in the 5 minute average over the previous 3 hours All the pressure readings for the installed pressure transducers are averaged together to obtain this value The error code displays whether each pressure sensor has an error There will be a one or a zero for the pressure sensor in each pressure transducer installed If a pressure transducer is not installed there will be an empty space for that sensor The standard 7150 barometer with two pressure transducers used in AWOS systems will display two digits one or zero followed by an empty space A zero represents no error A one reports a problem with that sensor Asterisks indicate values that are out of range or not present in the sensor The standard 7150 barometer with two pressure transducers used in AWOS systems will always display cc ccc as since the third pressure transducer is not installed All of the values will be represented initially by asterisks when polled immediately after being powered up Model 7150 Series Digital Barometer User s Manual Sample Poll Responses 2 9 9 3 2 2 9 9 3 5 ENE xn 1215 x x
12. es of digital barometers is also available as part of a complete kit for installation in the All Weather Inc Model 1190 or Model 1190 I Data Collection Platform DCP used in AWOS systems These kits include the digital barometer the M105037 Quad Plate Pressure Port and their associated tubing and power data cables Three kits are offered corresponding to the digital barometer models Digital Barometer Model Number MEL 7150 11906 7150 A 11906 A 7150 B 11906 B Model 7150 Series Digital Barometer User s Manual 2 THEORY OF OPERATION The 7150 Series Digital Barometer measurements are based on a peizoresistive pressure sensor and a temperature sensor which are measured continuously A microprocessor in the barometer calculates the pressure reading based on compensations for pressure linearity and temperature dependence As the pressure changes a silicon diaphragm in the pressure sensor bends and changes the height of the vacuum gap inside the sensor The resistivity of the sensor then changes in turn and this change in resistance is measured and converted into a pressure reading The pressure sensor operates over a wide dynamic range and includes a built in overpressure blocking mechanism The basic pressure and temperature compensations for the pressure transducers in the 7150 Series Digital Barometer are based on 37 calibration values that are applied to the current pressure and temperature readings The individual p
13. h the CE norms for electromagnetic com patibility The condition for this compliance is the use of braided cables and proper grounding techniques The 7150 Digital Barometer has successfully passed the following emissions and immunity tests EMISSIONS Test Set up according to IMMUNITY Test Set up according to Electrostatic Discharge IEC 61000 4 2 RF Radiated Fields IEC 61000 4 3 Electrical Ffast Transients IEC 61000 4 4 Surge IEC 61000 4 5 Conducted Immunity IEC 61000 4 6 Magnetic Immunity IEC 61000 4 8 12 Model 7150 Series Digital Barometer User s Manual 8 WARRANTY Unless specified otherwise All Weather Inc the Company warrants its products to be free from defects in material and workmanship under normal use and service for one year from date of installation or a maximum of two years from date of shipment subject to the following conditions a The obligation of the Company under this warranty is limited to repairing or replacing items or parts which have been returned to the Company and which upon examination are disclosed to the Company s satisfaction to have been defective in material or workmanship at time of manufacture b The claimant shall pay the cost of shipping any part or instrument to the Company If the Company determines the part to be defective in material or workmanship the Company shall prepay the cost of shipping the repaired instrument to the claimant Under no circumstances will t
14. he Company reimburse claimant for cost incurred in removing and or reinstalling replacement parts c This warranty shall not apply to any Company products which have been subjected to misuse negligence or accident d This warranty and the Company s obligation thereunder is in lieu of all other warranties express or implied including warranties of merchantability and fitness for a particular purpose conseguential damages and all other obligations or liabilities No other person or organization is authorized to give any other warranty or to assume any additional obligation on the Company s behalf unless made in writing and signed by an authorized officer of the Company 13 allweatherinc All Weather Inc 1165 National Drive Sacramento CA 95818 Fax 916 928 1165 Phone 916 928 1000 Toll Free 800 824 5873 7150 001 Revision D April 2014
15. r of times it has reset since the counter was reset to zero as shown in the example below This sensor has reset 84 times The CLEAR lt CR gt lt LF gt command resets the boot counter to zero This command will return a message to indicate that the counter has been cleared as shown in the example below Reboot counter reset to zero Model 7150 Series Digital Barometer User s Manual 4 INSTALLATION amp CHECKOUT 4 1 MOUNTING In AWOS applications the 7150 Digital Barometer has to be installed inside a weather resistant enclosure The user must also pay attention to the fact that the pressure fitting supplied with the barometer is not a static pressure head The barbed pressure fitting 1s not recommended for turbulent or high speed static wind conditions the accuracy quoted for the 7150 Series Digital Barometers does not include any wind effects The pressure fitting must also be carefully protected from rain since water may get into the pressure connector and cause errors in the pressure measurement These wind and rain effects can be eliminated by using the Quad Plate Pressure Port available from All Weather Inc as P N M105037 All AWOS systems supplied by All Weather Inc include the M105037 Quad Plate Pressure Port In benign room temperature conditions i e in laboratory measurements no further environmental protection is reguired In all cases pay close attention to grounding the barometer Connect
16. ressure Check Using the Z003919 pressure standard compare the output of the pressure sensor with the standard If a sensor reading differs from the standard by more than 0 05 inHg replace the sensor Note that offsets are applied when the 7150 Series Digital Barometers are used with AWOS systems to keep the displayed sensor readings within 0 005 inHg of the standard 5 2 5 Barometric Pressure Offset AWOS systems only With AWOS systems the readings have to be adjusted 1f the sensor reading drifts over time by applying an offset to keep the sensor readings within 0 005 inHg of the standard as explained in the AWOS user s manual for the system to which the barometer is interfaced Note the amount of deviation of the Model 7150 from the standard this will be used as the offset The offset will be negative if the pressure sensor reading is greater than the standard Note that offsets of more than 0 05 inHg are not allowed the sensor must be replaced in this case 5 2 6 Altimeter Setting Check AWOS systems only 1 Use the barometric pressure value obtained with the reference pressure sensor during triannual maintenance to calculate the Altimeter Setting using the formula below Alt Setting in Hg BP SE 1 313x10 3 where a 0 1903 SE Sensor elevation above sea level in feet BP Barometric pressure in in Hg 2 Record the calculated altimeter setting and that reported by the AWOS 3 If the difference be
17. ressure and temperature calibration coefficients are stored in the EEPROM of each pressure transducer The user cannot change these calibration coefficients 2 1 PRESSURE TRANSDUCER The 7150 Series Digital Barometers use Honeywell integrated pressure transducers Figure 1 to measure pressure Each pressure transducer uses an EEPROM to store its temperature and pressure calibration coefficients I Figure 1 Honeywell Pressure Transducer The pressure transducers communicate with the microprocessor on the barometer motherboard over an SPI bus The microprocessor on the 7150 motherboard can communicate with up to three pressure transducers The raw values from the pressure transducers are converted to pressure and temperature readings Model 7150 Series Digital Barometer User s Manual 3 OPERATION 3 1 COMMUNICATION The 7150 Series Digital Barometer communicates over its serial port at one of four baud rates The baud rate is selected by the SW3 DIP switches inside the enclosure Figure 2 shows the location of the SW3 DIP switches CI 9s E oo 90 o o9 o Figure 2 Location of SW3 DIP Switches The first two DIP switches are used to select the baud rate The default baud rate is 4800 bps Baud Rate bps ahi e 4800 OFF OFF x x x x ON x 9600 ON OFF x x x x ON x 19200 OFF ON x x x x ON x 57600 ON ON x x x x ON x RS 232 x x x x OFF ON ON x RS 485 x x x x ON OFF ON x RS 232 RS 485 x x x
18. tween the calculated altimeter setting and that reported by the AWOS is more than 0 01 inHg please advise AWI Customer Service at 1 916 928 1000 10 Model 7150 Series Digital Barometer 6 SPECIFICATIONS 14 7 33 0 inHg Pressure Range 500 1117 hPa 40 to 185 F Operating Temperature 40 to 85 C 67 to 257 F Storage Temperature 55 to 125 C Humidity noncondensing Pressure Units inHg Resolution 0 001 inHg 0 03 hPa Accuracy 0 004 inHg 0 1 hPa Baud Rate 4800 9600 19200 or 57600 bps Serial Port Parameter Setting 8 N 1 8 data bits no parity 1 stop bit Serial Connector DB9 female 9 pin D sub connector Supply Voltage 6 40 V DC reverse polarity protected Current Consumption lt 50 mA continuous operation mode Pressure Fitting barbed fitting for 1 8 1 D tubing Maximum Pressure Limit 60 inHg absolute Minimum Pressure Limit 0 inHg Enclosure powder coated aluminum s 5 71 W x 4 72 H x 2 56 D Dimensions 145 mm x 120 mm x 65 mm Weight 23 oz 0 63 kg Shipping Weight 34 oz 1 kg User s Manual 1 Accuracy is the sum of worst case linearity repeatability hysteresis thermal effects and calibration errors over the operating temperature range 11 Model 7150 Series Digital Barometer User s Manual 7 ELECTROMAGNETIC COMPATIBILITY C The 7150 Digital Barometer is designed to comply wit
Download Pdf Manuals
Related Search