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Voltage Levels?
i am working with a 0871LH1. i have 3 voltage levels in discrete output . 1: ice:0.7 vdc , 2. de-ici...
i am working with a 0871LH1. i have 3 voltage levels in discrete output . 1: ice:0.7 vdc , 2. de-ici...
(Posted by porojepajoohan 8 years ago)
Popular Campbell Scientific 0871LH1 Manual Pages
0871LH1 Freezing Rain Sensor - Page 1
INSTRUCTION MANUAL
0871LH1 Freezing Rain Sensor
November 2012
Copyright © 2007 Campbell Scientific (Canada)Corp.
0871LH1 Freezing Rain Sensor - Page 4
... 22
Appendix B: 1 Freezing Rain Sensor Block Diagram 23
1.1 Microcontroller...24 1.2 Watchdog/Reset Circuit...24 1.3 Serial EEPROM...24 1.4 Probe Oscillator ...24 1.5 Heater Control ...24 1.6 Drive Coil...25 1.7 Feedback Coil ...25 1.8 Heater...25 1.9 DC Power Supply ...25 1.10 Status Output ...25 1.11 Ice Signal Output ...25 2 Qualification Capabilities ...26 3 Input/Output Specification ...27...
0871LH1 Freezing Rain Sensor - Page 5
...set point plus an additional delay factor to decrease in the pickup coil. This tube exhibits magnetostrictive properties: it expands and contracts under the influence of an icing event, ice collects on the sensing probe again to be taken.
3 Detailed Principle of the probe to the freezing rain sensor... the Rosemount Aerospace model 0871LH1 Freezing Rain Sensor for the drive coil...
0871LH1 Freezing Rain Sensor - Page 6
... Termination
Strut Heaters
Figure 1 MSO Circuit Sectional View
Figure 2 MSO Circuit Schematic 3
The Status output indicates whether the freezing rain sensor is functioning correctly using tests that are described in more detail in an icing environment. Specifically, when the output is activated, a 60-second timer is reset. rain sensor remains in following sections of this document.
0871LH1 Freezing Rain Sensor - Page 8
The maximum weight of a unit is an integrated unit containing both the sensor and processing electronics. 5 Physical Description
The freezing rain sensor is 318 grams (0.7lbs).
Figure 3 Ice Detector 5 It contains a 7.35 cm (2.9") square faceplate for mounting to the 0871LH1MNT and a 7.28 cm (2.86") diameter housing containing the processing electronics.
0871LH1 Freezing Rain Sensor - Page 9
... output.
8 Mounting Considerations
Figure 4 Mounting (part number 0871LH1 MNT) The freezing rain sensor should be mounted to a sturdy crossarm located away from buildings or other obstacles that the sensing probe is a minimum of 92cm (36") above horizontal to be installed so that could shadow the sensing element from strut. 2. Position the freezing rain sensor on the unit.
6 Attach to...
0871LH1 Freezing Rain Sensor - Page 12
... outputs of the 0871LH1 for the datalogger to receive data from the 0871LH1, 'ports 1 & 2 must be configured as they may cause problems if shorted to the sensor status.
NOTE:...24VDC Return
Pin Colour
A
Red
B
Black
Connection V+ V- WARNING:
Isolate wires that are updated only after an icing event or status change occurs.
'Declare Public Variables Public TimeCount Public ...
0871LH1 Freezing Rain Sensor - Page 14
... [ FaultStat ]
11: End (P95)
;Check to see if there is Ice on the sensor and output it to final storage. 12: If (XF) (P89) 1: 2 X Loc [ IceStat ] 2: 1 = 3: 0 F 4: 30 Then Do
13: Do (P86) 1: 10 Set Output Flag High (Flag 0)
14: Set Active Storage Area (P80)^10755 1: 1 Final Storage Area 1 2: 20 Array ID
15: Real...
0871LH1 Freezing Rain Sensor - Page 20
... capabilities of the freezing rain sensor consist of hardware, continuous, power-up, and operator-initiated tests. A 24-byte string is detected and verified, the freezing rain sensor stops detecting and ...BAUD (One Start Bit, 8 Data Bits, No Parity, One Stop Bit). To eliminate nuisance errors, failures are counted and enunciated once they have been verified. See Section 9, Table 3 for...
0871LH1 Freezing Rain Sensor - Page 22
... STATUS output will be set in the RS-422 string and on the discrete outputs so monitoring electronics or test equipment can verify activation.
• The freezing rain sensor heater is turned on...datalogger use a digital voltmeter (DVM); 6 Operator-Initiated Tests
The operator can test the freezing rain sensor functionality by squeezing the tip of the probe between the Ice signal (blue wire in ...
0871LH1 Freezing Rain Sensor - Page 23
...for greater than 100 ms also causes the ice detector to perform Initiated BIT. The freezing rain sensor compensates by adding a value (ranging from 0 to 255, indicates the number of times...the correlation count is a value tracked by ice build-up .
8 Correlation Counting
The freezing rain sensor tracks the amount of ice accumulation on the probe during the icing encounter. The correlation ...
0871LH1 Freezing Rain Sensor - Page 25
...-Minute Increments Cold Start Power-On Count Ice Events Total Failures Encountered. F Not Used Not Used
0 - FFFF 00 - FF
10 Electrostatic Discharge (ESD) Consideration
The freezing rain sensor internal components are ESD sensitive, class 1, so proper ESD precautions must be observed (wrist straps, conductive surfaces) when handling.
22 LAST ERR 1 16 - PERM ERR...
0871LH1 Freezing Rain Sensor - Page 26
Figure 6 Functional Block Diagram 23
Appendix B
1 Freezing Rain Sensor Block Diagram
The block diagram in Figure 4: Functional Block Diagram provid understanding of the functionality of the freezing rain sensor.
0871LH1 Freezing Rain Sensor - Page 27
...Oscillator
The probe oscillator is measured by the end user and also to confirm and repair failures reported by the microcontroller. The watchdog also provides reset pulses on initial power...ice sensing probe. Upgraded microcontrollers that it is this frequency change that is the electronic control portion of RTCA DC-160C, Section 16, Category Z. The freezing rain sensor uses about 75% ...
0871LH1 Freezing Rain Sensor - Page 28
... Hz, equivalent to meet RTCA DO-160C power input, voltage spike, and lightning requirements.
1.10 Status Output
The status output provides a ground output when the freezing rain sensor is in the
25 This output is 25 seconds.
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