Campbell-scientific 0871LH1 Freezing Rain Sensor Uživatelský manuál

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INSTRUCTION MANUAL
Copyright © 2007
Campbell Scientific (Canada)Corp.
0871LH1
Freezing Rain Sensor
November 2012
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Strany 1 - INSTRUCTION MANUAL

INSTRUCTION MANUALCopyright © 2007Campbell Scientific (Canada)Corp.0871LH1Freezing Rain SensorNovember 2012

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7 9 Wiring The wiring of the 0871LH1 will depend on the required communication outputs of your application. If you require the use of the discrete

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8 Figure 5 General Hook-up Diagram 99.2 0871LH1CBL-L Wiring for RS422 Output The MD485 Multidrop Interface, the L15966 Wall Charger and the SC110

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9 If the application requires the monitoring of the discrete outputs the 5Vdc connection must be made. Isolate wires that are not connected as they m

Strany 5 - 2 General

10 Scan (5,Sec,0,0) 'Start timer to corrdinate monitoring of ice signal output from sensor TimeCount = Timer (1,Sec,0 ) 'Dur

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11 4: 30 Then Do 7: Do (P86) 1: 10 Set Output Flag High (Flag 0)

Strany 7 - 4 Specifications

12'CR1000 Series Datalogger 'Declare Public Variables Public PTemp, batt_volt Public LH1_Byte_Count As Float Public Read_LH1 As Boolean Pu

Strany 8 - 5 Physical Description

13 DataInterval (0,15,Sec,10) Minimum (1,batt_volt,FP2,0,False) Sample (1,PTemp,FP2) Sample (1,Ice,IEEE4) Sample (1,Ice_mm,IEEE4) EndTable

Strany 9 - 8 Mounting Considerations

14 'update the byte count Old_Byte_Count = LH1_Byte_Count 'reset and start the timer Timer (1,mSec,2) '

Strany 10 - 9 Wiring

15 'BIT 1 - Ice Output If (LH1_Byte(1) AND &B00000010) <> 0 Then LH1_Ice_Output = "Ice" Else LH1_Ice_

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16 ElseIf (LH1_Byte(5) AND &B011000000) = &B01000000 Then LH1_ERR_PROBE_HEATER = "Always On" ElseIf (LH1_Byte(5) AND &

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17Appendix A 1 RS-422 Output Format for non-Campbell Datalogger Applications This output operates at 9600 BAUD (One Start Bit, 8 Data Bits, No Par

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18• The MSO is operating correctly. Frequencies between 39000 and 40150 Hz are valid. • The probe heater is de-icing correctly. After turn-on, the

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196 Operator-Initiated Tests The operator can test the freezing rain sensor functionality by squeezing the tip of the probe between the index finge

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20perform the MSO capacitor selection process without activation of the probe heater.) Activation of the Press-to-Test (PTT) input for greater than

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9 Ice Detector RS-422 String Format Table 8. Serial String Format Byte Bit Definition Comments/Interpretation/Range 0 (First) 7 (MSB) String ID

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22Table 8. Serial String Format (Continued) 5 - 7 ON-TIME CNT Power-On Time (In Hex) in 10-Minute Increments 00 - 01FFFF 8 - 9 COLD START CNT

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23Appendix B 1 Freezing Rain Sensor Block Diagram The block diagram in Figure 4: Functional Block Diagram providunderstanding of the functionality

Strany 20 - Appendix A

2411.1 Microcontroller The freezing rain sensor uses an Intel 87C51-type microcontroller to control the freezing rain sensor functions. This 8-bit mi

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2511.6 Drive Coil The drive coil modulates the magnetic field of the magnetostrictive oscillator and causes an ultrasonic axial movement of the probe

Strany 22 - 6 Operator-Initiated Tests

260871LH1 model uses this feedback to verify that the ice output is operating correctly. To interface to the 0871LH1, the power supply must provide

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273 Input/Output Specification 33.1 Input/Output Pin Designations Table 10. Input/Output Pin Designations Signal Name Connector Pin Input or Outpu

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Campbell Scientic Canada Corp. | 11564 149 Street | Edmonton AB T5M 1W7 | 780-454-2505 | www.campbellsci.caAUSTRALIA | BRAZIL | C

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1 TABLE OF CONTENTS 1 Purpose ...

Strany 27 - Watchdog/Reset Circuit

2 1 Purpose This document provides detailed information about the Rosemount Aerospace model 0871LH1 Freezing Rain Sensor for use in ground-based me

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3 rain sensor remains in an icing environment. The ice signal activates at 0.5mm ice accretion and stays on for 60 seconds after the end of the icing

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4 4 Specifications Power Supply Operating Voltage: 18 – 29.5 VDC Power Draw: 5W max at 24 VDC (sensing mode) 27W max at 24 VDC (deicing m

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5 5 Physical Description The freezing rain sensor is an integrated unit containing both the sensor and processing electronics. It contains a 7.35 c

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6 6 Temperature Considerations In the case of unit malfunction causing strut heater lock-on, the probe temperature can exceed 204.4°C. Maintenance

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