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Campbell SnowVUE 10, Руководство по эксплуатации продукта

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8.3 Temperature compensation

Temperature corrections for the speed of sound must be applied to the readings by using
measurements from a reliable and accurate temperature sensor, such as the 109. The
temperature sensor needs to be housed in a radiation shield. Temperature compensation is
applied to the SnowVUE 10 output using either the following formula or the

a

XWT+CC.C!

extended command (

Table 8-2

[p. 16]).

CAUTION:
The SnowVUE 10 calculates distance readings using the speed of sound at 0 °C (331.4 m/s). If
the temperature compensation formula is not applied or manually specified using the

XWT!

command, the distance values will not be accurate for temperatures other than 0 °C.

8.4 SDI-12 measurements

The SDI-12 protocol supports the SDI-12 commands listed in

Table 8-2

(p. 16).

NOTE:
The SnowVUE 10 needs to be powered for at least 1.5 s before it can receive an SDI-12
command.

The different commands are entered as options in the SDI-12 recorder instruction. If the
SnowVUE 10 is unable to detect a proper echo for a measurement, the sensor will return a 0 for
the distance-to-target value.

Table 8-2: SDI-12 commands

SDI-12

1

command

Values returned or

function

Units

Max. sensor

response

time

a

M!

,

a

C!

Distance

m

20 sec

a

M1!

,

a

C1!

1. Distance

2. Quality number

1. m

2. N/A (not

applicable)

20 sec

a

M2!

,

a

C2!

1. Distance

2. Reference temperature

1. m

2. ° C

20 sec

SnowVUE 10 Sonic Ranging Sensor

16

Содержание SnowVUE 10

Страница 1: ...Revision 12 2022 Copyright 2021 2022 Campbell Scientific CSL I D 1380 ...

Страница 2: ...s under guarantee or not Please state the faults as clearly as possible and if the product is out of the guarantee period it should be accompanied by a purchase order Quotations for repairs can be given on request It is the policy of Campbell Scientific to protect the health of its employees and provide a safe working environment in support of this policy a Declaration of Hazardous Material and De...

Страница 3: ... cell phones and aerials may also not be applicable according to your locality Some brackets shields and enclosure options including wiring are not sold as standard items in the European market in some cases alternatives are offered Details of the alternatives will be covered in separate manuals Part numbers prefixed with a symbol are special order parts for use with non EU variants or for special...

Страница 4: ...e beginning work Wear a hardhat and eye protection and take other appropriate safety precautions while working on or around tripods and towers Do not climb tripods or towers at any time and prohibit climbing by other persons Take reasonable precautions to secure tripod and tower sites from trespassers Use only manufacturer recommended parts materials and tools Utility and Electrical You can be kil...

Страница 5: ...ng height 11 7 4 1 Reference point 11 7 5 Mounting 11 8 Operation 14 8 1 Quality numbers 14 8 2 Pitch roll and tilt axis 15 8 3 Temperature compensation 16 8 4 SDI 12 measurements 16 8 5 Updating the operation system OS 19 9 Maintenance and troubleshooting 23 9 1 Disassembly assembly procedures 23 9 2 Data interpretation 25 9 3 Data filtering 25 Appendix A Importing Short Cut code into CRBasic Edi...

Страница 6: ... connector or by disconnecting the cable wires from their termination points l Follow local regulations see Compliance in Specifications p 6 3 Initial inspection Check the packaging and contents of the shipment If damage occurred during transport immediately file a claim with the carrier Contact Campbell Scientific to facilitate repair or replacement 4 QuickStart A video that describes data logger...

Страница 7: ...the 109 temperature probe 3 In the Available Sensors and Devices box type 109 or find the 109 in the Sensors Temperature folder Double click 109 Temperature Probe Under the Properties tab use the default of Deg C 4 Click the Wiring tab to see how the temperature probe is to be wired to the data logger Wire the probe accordingly then click OK SnowVUE 10 Sonic Ranging Sensor 2 ...

Страница 8: ... to the ground this value should be in the same units as the Units of measure The default for Units of measure is m this can be changed by clicking the Units of measure box and selecting another value SDI 12 Address defaults to 0 Type the correct SDI 12 Address if it has been changed from the factory set default value Click the Air temperature Deg C reference box and select the reference temperatu...

Страница 9: ...then click OK 7 Repeat steps five and six for other sensors if necessary Click Next 8 In Output Setup type the scan rate meaningful table names and Data Output Storage Interval Click Next For this sensor Campbell Scientific recommends measurement scans of 15 seconds or more SnowVUE 10 Sonic Ranging Sensor 4 ...

Страница 10: ...flected from that target The time from pulse transmission to echo return is the basis for obtaining the distance measurement Since the speed of sound in air varies with temperature an independent temperature measurement is required to compensate the distance reading The SnowVUE 10 requires an external temperature sensor such as the 109 to provide the measurement The SnowVUE 10 is designed for extr...

Страница 11: ... CR1000X CR800 series CR300 series CR3000 and CR1000 6 Specifications Power requirements 9 to 18 VDC Quiescent current consumption 300 µA Active current consumption 210 mA peak 14 mA average 20 C Measurement time 5 s typical 20 s maximum Output SDI 12 version 1 4 Measurement range 0 4 to 10 m 1 3 to 32 8 ft Accuracy 0 2 of distance to target Accuracy specification excludes errors in the temperatur...

Страница 12: ... ft IP rating Electrical housing Transducer Compliance M12 5 pole A coded pin connector 60 m 197 ft 3 conductor polyurethane sheathed screened cable 4 8 mm 0 19 in nominal diameter Corrosion resistant type III anodized aluminium 9 9 cm 3 9 in 7 6 cm 3 0 in 293 g 10 3 oz 250 g 8 2 oz IP67 IP64 This device complies with Part 15 of the USA Federal Communications Commission FCC Rules Operation in the ...

Страница 13: ... are automatically configured by the SDI12Recorder instruction To use more than one sensor per data logger either connect the different sensors to different terminals on the data logger or change the SDI 12 addresses so that each sensor has a unique SDI 12 address Using unique SDI 12 addresses reduces the number of terminals used on the data logger and allows sensors to be connected in a daisy cha...

Страница 14: ...mming The SDI12Recorder instruction sends a request to the sensor to make a measurement and then retrieves the measurement from the sensor See SDI 12 measurements p 16 for more information For most data loggers the SDI12Recorder instruction has the following syntax SDI12Recorder Destination SDIPort SDIAddress SDICommand Multiplier Offset FillNAN WaitonTimeout Valid values for the SDIAddress are 0 ...

Страница 15: ...he face of the transducer is perpendicular to the intended target surface The SnowVUE 10 has a beam angle of approximately 30 degrees which means that objects outside this 30 degree beam will neither be detected nor interfere with the intended target Any unwanted target must be outside the 30 degree beam angle Determine the required clearance for the beam angle using the following formula and Figu...

Страница 16: ...er snow depth errors 7 4 1 Reference point The front grill on the ultrasonic transducer is used as the reference for distance values Because of the difficulty of measuring from the grill itself most users measure the distance from the target to the outer edge of the plastic transducer housing Figure 7 2 p 11 and then add 8 mm 0 3 in to the measured distance Figure 7 2 Depth of space from edge of t...

Страница 17: ...rews fasten the SnowVUE 10 securely to the bracket The SnowVUE 10 mounting stem Figure 7 4 p 13 attaches to the crossarm using the 1 inch 1 inch Nu Rail fitting Figure 7 5 p 13 CM221 right angle mount CM230 adjustable angle mount or CM230XL extended adjustable angle mount Use the CM230 or CM230XL if the ground surface is at an angle Figure 7 3 Crossarm installation using the SnowVUE 10 mounting ki...

Страница 18: ...Figure 7 4 SnowVUE 10 mounting stem Figure 7 5 SnowVUE 10 mounted to a crossarm using the mounting stem and a 1 inch 1 inch Nu Rail fitting SnowVUE 10 Sonic Ranging Sensor 13 ...

Страница 19: ...data These numbers indicate the measurement certainty The quality number is calculated as the standard deviation of multiple readings used to return one distance value A 0 indicates that the reading was not obtained Numbers greater than 300 indicate a degree of uncertainty in the measurement Causes of high numbers include l sensor is not perpendicular to the target surface l target is small and re...

Страница 20: ... are considered to be on the sides of the sensor with the product model name on one side and the company logo on the other Pitch occurs when the vent tilts forward or backward around the x axis Figure 8 2 p 15 roll occurs when the sensor rotates side to side around the axis of the vent and connector y axis Figure 8 1 Tilt axis with the black vent on the y axis representing the front of the sensor ...

Страница 21: ...the XWT command the distance values will not be accurate for temperatures other than 0 C 8 4 SDI 12 measurements The SDI 12 protocol supports the SDI 12 commands listed in Table 8 2 p 16 NOTE The SnowVUE 10 needs to be powered for at least 1 5 s before it can receive an SDI 12 command The different commands are entered as options in the SDI 12 recorder instruction If the SnowVUE 10 is unable to de...

Страница 22: ...l temperature 3 Internal RH 4 Pitch 5 Roll 6 Supply voltage 7 Resonant frequency should be 50 kHz 8 Alert flag 0 good 1 transducer outside of normal operating range 1 C 2 C 3 4 5 6 V 7 kHz 8 N A 3 sec aR3 Returns the CPU temperature C aI a14CampbellSnow10SN nnnnn SDI 12 address a SDI 12 version 14 vendor Campbell model Snow10 SN Serial number 5 digits aV 1 Operating system OS version 2 Hardware ve...

Страница 23: ...nce temperature with a value that remains the same unless power is cycled or a new temperature value is sent the default value on power up is 0 C C aXWT CC C where CC C temperature in degrees Celsius Sets reference temperature which must be a maximum of one decimal place C aXLOADOS rrrrr SNOWVUE_ nnn xobj where rrrrr baud rate SNOWVUE_nnn xobj OS name Sends the new OS to the sensor refer to Updati...

Страница 24: ...and XLOADOS sends the new operating system OS to the sensor NOTE Only the CR6 CR1000X and CR300 series data loggers are compatible with the XLOADOS functionality Verify that the data logger has been updated to the latest OS to ensure compatibility If a compatible data logger is not available to update the sensor send the sensor to the factory to have Campbell Scientific update the OS A returned ma...

Страница 25: ...sing Device Configuration Utility l Connect to the data logger l Open the File Control tab l Click Send and select the SNOWVUE_114 xobj file from the C Campbellsci Lib OperatingSystems directory File type needs to be changed to All Files for the xobj file to show up on the list l Verify that the xobj file is now on the data logger CPU drive 3 Connect the sensor to the data logger digital and power...

Страница 26: ... prompt l Verify that the responding sensor is the SnowVUE 10 that you want to update by using the SDI 12 verify command aI 6 Send the OS to the sensor with the XLOADOS extended command in the following format l address XLOADOS baud rate OS name l For example this update would be entered as 0XLOADOS 57600 CPU SNOWVUE_114 XOBJ NOTE CR300 series data loggers are case sensitive and the file name must...

Страница 27: ...When the OS update is complete the word SUCCESS is displayed 8 Verify that the OS was updated with the verify command aV followed by the aD0 command to read the results SnowVUE 10 Sonic Ranging Sensor 22 ...

Страница 28: ...ures The following figures show the procedure for disassembling the SnowVUE 10 Disassembly is required to change the transducer CAUTION Before proceeding with any maintenance always retrieve the data first Campbell Scientific also recommends saving the data logger program CAUTION Always disconnect the SnowVUE 10 from the data logger or the connector before disassembling SnowVUE 10 Sonic Ranging Se...

Страница 29: ...ws from the transducer housing Figure 9 1 Transducer screws 3 Remove transducer housing and disconnect wires Figure 9 2 Disassembled SnowVUE 10 4 When it is time to reassemble the sensor carefully do so in reverse order SnowVUE 10 Sonic Ranging Sensor 24 ...

Страница 30: ...d number of echo quality numbers returned to the sensor Under these circumstances a SnowVUE 10 can underestimate or overestimate snow depth If the signal is too weak the sensor will output a value of 0 for the distance to target When the echoes are weak the sensor automatically increases sensitivity which makes the sensor prone to erroneous readings from flying debris drifting snow or obstruction ...

Страница 31: ...4 0 10 0 35 0 28 1 1 erroneous reading 0 32 2 0 erroneous reading 0 33 0 37 0 33 0 28 0 34 0 36 0 35 0 10 high error reading 0 36 0 33 0 37 0 32 2 0 The best course of action would be to ignore the five lowest and five highest values and use the sixth median value of 0 33 SnowVUE 10 Sonic Ranging Sensor 26 ...

Страница 32: ... refinement NOTE Once the file is edited with CRBasic Editor Short Cut can no longer be used to edit the program 2 To add the Short Cut wiring information into the new CRBasic program open the DEF file located in the C campbellsci SCWin folder Copy the wiring information found at the beginning of the DEF file 3 Go into the CRBasic program and paste the wiring information at the beginning of the pr...

Страница 33: ...info campbellsci fr www campbellsci fr Germany Location Phone Email Website Bremen Germany 49 0 421 460974 0 info campbellsci de www campbellsci de India Location Phone Email Website New Delhi DL India 91 11 46500481 482 info campbellsci in www campbellsci in South Africa Location Phone Email Website Stellenbosch South Africa 27 21 8809960 sales campbellsci co za www campbellsci co za Spain Locati...

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