Campbell-scientific 0871LH1 Freezing Rain Sensor Manual de usuario

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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1 TABLE OF CONTENTS 1 Purpose ...

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

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

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

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

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