RD01 Rain Detector - Campbell Scientific
Contents
1. CallTable RainEvents PreviousRainingState Raining EndIf Save regular data CallTable RainData NextScan EndProg RDO1 Rain Detector 5 Technical Data Specifications Sensor Type Sensor sensing area Angle of element Sensitivity ON delay Trip delay OFF gt gt ON OFF delay Shut off delay ON gt gt OFF Dimensions Weight Cable length Material Electrical Features Outputs Supply Voltage Current Consumption Sensor Power Consumption Rain ON OFF Analogue Output Frequency Output Operating Conditions Operating Temperature 15 55 C Storage Temperature 40 65 C Capacitive with integrated heater 6 6cm 30 Min wet area 0 05cm lt 0 1ms lt 5 min Diam x height 4107 x 70 mm 450g 5m BASF LURAN S777K 12Vdc 10 130mA typical 230mA max 10mA with heater disabled 0 5 2 3W Open by default closed in case of rain Max Voltage 15V Max Current SOmA 0 1V OV rain 1V dry sensor 1500 6000Hz wet dry Not calibrated CAMPBELL SCIENTIFIC COMPANIES Campbell Scientific Inc CSD 815 West 1800 North Logan Utah 84321 UNITED STATES www campbellsci com info Ocampbellsci com Campbell Scientific Africa Pty Ltd CSAf PO Box 2450 Somerset West 7129 SOUTH AFRICA www csafrica co za sales csafrica co za Campbell Scientific Australia Pty Ltd CSA PO Box 444 Thuringowa Central QLD 4812 AUSTRALIA www campbells2. Installation and Maintenance 4 Programming Place the detector clear from all buildings trees etc taking care that no object is over the detector The supplied bracket will accommodate any 30 to 50mm diameter horizontal or vertical post A standard 5m cable is supplied with an IP68 connector to connect the cable to the bottom of the instrument the colours of the leads and the relating functions are listed above To ensure good noise immunity we recommend connecting the cable braid to the earth and keeping the heater and the electronics earth leads separate Clean the sensor regularly with a cotton bud soaked in distilled water in case of more substantial dirt mild cleansers can be used in moderation The sensor is fragile the sensor element is a thin ceramic disk Handle it with care The following program shows two methods for reading the sensor with a Campbell Scientific logger Firstly by measuring the analogue signal and secondly by reading the rain on off state The program scales the analogue signal to give a value between 0 Dry and 100 Heavy Rain and returns a true false value for whether it is raining or not To determine the rain on off state a 10k resistor must be placed between the control port where the rain on off wire is attached and 5V on the logger User Manual Example CR1000 Program to measure the RDO1 Rain Detector This program shows how to measure the sensors analogue output and scale it from 0 Dry
3. RDO1 Rain Detector User Manual Issued 22 10 08 Copyright 2008 Campbell Scientific Ltd CSL 789 Guarantee This equipment is guaranteed against defects in materials and workmanship This guarantee applies for twelve months from date of delivery We will repair or replace products which prove to be defective during the guarantee period provided they are returned to us prepaid The guarantee will not apply to e Equipment which has been modified or altered in any way without the written permission of Campbell Scientific e Batteries e Any product which has been subjected to misuse neglect acts of God or damage in transit Campbell Scientific will return guaranteed equipment by surface carrier prepaid Campbell Scientific will not reimburse the claimant for costs incurred in removing and or reinstalling equipment This guarantee and the Company s obligation thereunder is in lieu of all other guarantees expressed or implied including those of suitability and fitness for a particular purpose Campbell Scientific is not liable for consequential damage Please inform us before returning equipment and obtain a Repair Reference Number whether the repair is 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 When returning equipment the Repair Reference Number must
4. be clearly marked on the outside of the package Note that goods sent air freight are subject to Customs clearance fees which Campbell Scientific will charge to customers In many cases these charges are greater than the cost of the repair CAMPBELL SCIENTIFIC EUROPE WHEN MEASUREMENTS MATTER Campbell Scientific Ltd Campbell Park 80 Hathern Road Shepshed Loughborough LE12 9GX UK Tel 44 0 1509 601141 Fax 44 0 1509 601091 Email support campbellsci co uk www campbellsci co uk Contents PDF viewers note These page numbers refer to the printed version of this document Use the Adobe Acrobat bookmarks tab for links to specific sections 4 Programming u ee 2 5 Technical Data Specifications Figure RDO1 Rain Detector Table 1 RDO1 Datalogger Wiring Details RDO1 Rain Detector 1 Description RDO1 Rain Detector The RDO is a rain detector based on the principle of measuring the capacitance of the material present on a sensing element The capacitance of the sensor element set at an angle changes according to the accumulation of raindrops on the sensor surface An integral heater keeps it free of frost and condensation and helps speed drying to detect the end of a rain event The heater will also activate at low temperatures to detect snow fall by melting it An external circular windshield protects the element from damage and improves its sensitivity to light rain The instrument has t
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6. eldNames Raining Average 1 Raining Boolean False FieldNames Raining_1Min_AVG Sample 1 RainIntensity FP2 FieldNames RainIntensity Average 1 RainIntensity FP2 False FieldNames RainIntensity_1Min_AVG EndTable Main Program BeginProg Initialise the raining state by reading the current value Raining NOT CheckPort RainOnOffControlPort PreviousRainingState Raining Main Scan 1 Second Interval Scan 1 Sec 0 0 Only enable the heater if the logger battery voltage is gt heater threshold default 11 5V this will conserve battery power if the logger power levels start to fall Battery Batt_Volt HeaterState IIF Batt_Volt lt HeaterThreshold HeaterOff HeaterOn PortSet HeaterControlPort HeaterState Measure the analogue output of the sensor to determine intensity 0 Dry to 100 Heavy Rain VoltSe ScaledRainIntensityAsRead 1 mV5000 AnalogueMeasurementSEChannel True 0 _50Hz 0 1 100 Select Case ScaledRainIntensityAsRead Case Is lt 0 RainIntensity 0 Case Is gt 100 RainIntensity 100 Case Else RainIntensity ScaledRainIntensityAsRead EndSelect Check the current rain state high rain low dry There is a 2 minute delay in the sensor so that a rain over condition can be detected Raining NOT CheckPort RainOnOffControlPort Log an event for any change in the rain state If Raining lt gt PreviousRainingState Then Raining state has changed so log the event
7. hree different outputs 1 Rain ON OFF output which detects whether it is raining snowing ON or not OFF which can be used to control a relay coil or similar devices This is an open collector output 2 Analogue voltage output calibrated 0 1V which indicates the precipitation rate 3 A1 5 6KHz frequency output not calibrated which provide an indication of current precipitation intensity The ON OFF output has a delay circuit that indicates the end of a rain event with a 5 minute delay so that the end of rain is not indicated too soon in the event of light or intermittent rain The heater can be disabled when power consumption is critical To do it set the Heater OFF input on OV The sensor will still detect rain in this state but will not melt ice nor detect the end of a rain event so quickly RDO1 Rain Detector 2 Wiring The RDO can be used with all Campbell Scientific dataloggers Wiring colours and connections between the sensor and datalogger are shown in Table 1 Table 1 RDO1 Datalogger Wiring Details Analogue Colour Description Wiring SE Red Vin 12Vdc 12V Blue Rain On Off See below Green Heater Off Control Port Yellow Analogue Out SE Channel White Frequency Out Not normally used Black Ground AG Grey Heater ground G For Rain on off connect the blue wire to a control port and insert a 10k resistor between the control port and 5V 3
8. to 100 Heavy Rain along with measuring the rain on off state Note that to use the rain on off state you must have a 10k resistor fitted between 5V and the control port used to measure the rain on off state Ensure any settings are retained PreserveVariables These constants define which ports the sensor will be read on Const AnalogueMeasurementSEChannel 1 SEI Const RainOnOffControlPort 1 Cl Const HeaterControlPort 2 C2 This is the voltage threshold below which the heater will be turned off Const HeaterThreshold 11 5 Defined heater states Const HeaterOn 1 Const HeaterOff 0 This variable contains the battery voltage Public Batt_Volt This variable is used to determine when a change takes place between raining and not raining Dim PreviousRainingState As Boolean This variable is set to true when it is raining Public Raining As Boolean These variables hold the rain intensity reading 0 Dry 100 Heavy Rain Dim ScaledRainIntensityAsRead Public RainIntensity The current heater state Public HeaterState This table stores events as the raining state changes from raining to not raining and vice versa DataTable RainEvents True 1 Sample 1 Raining Boolean FieldNames Raining Sample 1 RainIntensity FP2 FieldNames RainIntensity EndTable This table stores rain information every minute DataTable RainData True 1 Datalnterval 0 1 Min 10 Sample 1 Raining Boolean Fi
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