Omega RG-2501 Weather Radio User Manual
Contents
1. OILVIW3HOS S AGOIG NOISS34Mddhs 49405 HOVLLY nu or asa 21 95 NOlLdl42S3Q0 7093 3Sv3l33 s 19079 NIVY 1X 29423981 MO ZX 1 NOILO31O3d M3LNnOO YO M30MOO3M 1N3A3 SQV31 3MIM 09 1300N 39nv9 NIVY ATI8W3SSY NOlLdlJ2S30 003 af OL MIYOS Z 1 Z 39NYHO 201086 9 22000001 moda 39v9 ON va ooo SINO 1 vi t gt 55 uS vf x201 vic POTN 9i OM 30 5 vaz 411424 1061169 NOI153S NL P N 10000049 10000069 10000070 10000072 10000076 10000077 10000078 10000079 10000116 10000224 10000225 21051401 41500302 41900600 46311501 51001802 71010100 72310503 72060401 72083301 72341001 72082002 72302101 72341101 72188003 72083003 72211410 72246310 72300301 72340210 72380000 PARTS LIST FOR TIPPING BUCKET RAIN GAGE MODEL 260 2501 8 INCH ORIFICE 0 01 PER TIP ECO 980102 DESCRIPTION SCREEN DRAIN BRACKET BUCKET SHAFT SUPPORT BRACKET BUCKET SUPPORT MOUNTING LEG RAIN GAGE SUPPORT BODY ASSEMBLY OUTER CASE BRACKET BARREL SWITCH BUCKET WITH SHAFT ASSEMBLY MAGNET WITH BRACKET ASSEMBLY FUNNEL ASSEMBLY 8 INCH SCREEN LOWER FUNNEL 2 DIA SCREEN UPPER FUNNEL 7 5 8 DIA TERMINAL BLOCK 2 PIN STRAIN RELIEF SIGNAL CABL2. Gauge 1 Operator s Manual 1 If you have any questions about the shipment please call the OMEGA Customer Service Department When you receive the shipment inspect the container and equipment for signs of damage Note any evidence of rough handling in transit Immediately report any damage to the shipping agent The carrier will not honor damage claims unless all shipping material is saved for inspection After examining and removing contents save packing material and carton in the event reshipment is necessary TABLE OF CONTENTS Chapter 1 Introduction soe dox Over a oen VS u q KU Sane HER 1 1 General Description 5 ou ue e ha ae SASS NC das P RR 1 2 Specifications o denoted odo Ao ML a ee Chapter 2 InstalIaBioIt pam goes oe x axe Dark XAR e ela a 2 1 Site Requirements sv suo wee wea xd wo xo Sex oS RR A 3 Eod su 2 2 Installation v cvi SAO de TE ANC OC NUR ok QR alode qe Chapter 9 Operation adios RC VR IUS ve Us Ave REUS TQ e ds qus Gh pter s Um re a q w Poles AUC eni Rare tk Table of Standard Calibration Quantities Chapter 5 Maintenance v eoe aro ie AENEIS PK IU vun CU oes Chapter 6 Troubleshootlng asa wee SER A Q Chapter 1 Introduction 1 1 General Description The OMEGA Model RG 250
3. if the unit shows evidence of having been tampered with or shows evidence of being damaged as a result of excessive corro sion or current heat moisture or vibration improper specification misapplication misuse or other operating conditions outside of OMEGA s control Components which wear or which are damaged by misuse are not warranted These include contact points fuses and triacs OMEGA is glad to offer suggestions on the use of its various products Nevertheless OMEGA only warrants that the parts manufactured by it will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHAT SOEVER EXPRESSED OR IMPLIED EXCEPT THAT OF TITLE AND ALL IMPLIED WAR RANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract war ranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages Every precaution for accuracy has been taken in the preparation of this manual however OMEGA ENGINEERING INC neither assumes responsibility for any omissions or errors that may appear nor assumes liability for any damages that res
4. relative to the product relative to the product OMEGA s policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering OMEGA is a registered trademark of OMEGA ENGINEERING INC Copyright 1995 OMEGA ENGINEERING INC All rights reserved This documentation may not be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form in whole or in part without prior written consent of OMEGA ENGINEERING INC Where Do Find Everything Need for Process Measurement and Control OMEGA Of Course TEMPERATURE 4 Thermocouple RTD Thermistor Probes Connectors Panels amp Assemblies 4 Wire Thermocouple RTD amp Thermistor 4 Calibrators Ice Point References 4 Recorders Controllers amp Process Monitors 4 Infrared Pyrometers PRESSURE STRAIN FORCE 4 Transducers Strain Gages 4 Load Cells Pressure Gauges 4 Displacement Transducers 4 Instrumentation amp Accessories FLOW LEVEL 4 Rotameters Gas Mass Flowmeters amp Flow Computers A Air Velocity Indicators A Turbine Paddlewheel Systems 4 Totalizers amp Batch Controllers pH CONDUCTIVITY pH Electrodes Testers amp Accessories Benchtop Laboratory Meters 4 Controllers Calibrators Simulators amp Pumps 4 Industrial pH amp Conductivity Equipment DATA ACQUISITION 4 Data
5. 1 Tipping Bucket Rain Gauge provides an inexpensive yet accurate method for measuring and recording rainfall The tipping bucket design provides a means for operating an magnet sensitive switch The switch contact closure may be used with electro mechanical counters event recorders or electronic recording equipment to automatically obtain a record of the rainfall The standard model of the rain gauge Model RG 2501 produces a switch closure for each 0 01 inch of rainfall The Model RG 2501M switch closure represents 1 millimeter of rainfall Other calibrations of the rain gauge are available upon request The tipping bucket design allows unlimited measurements since the tipping action dumps the water out of the bucket on alternating tips Drain holes in the base plate allow the water to drain out of the gauge All OMEGAS rain gauges are made of the highest quality materials to provide long term trouble free operation with a minimum of maintenance as long as each gauge has been properly installed and maintained Parts of the rain gauge are made of aluminum with anodized or painted finishes Fasteners are all stainless steel except for the aluminum pop rivets used to hold the bug screens in place Some components are made of plastic including the terminal block the signal cable strain relief the calibration screw acorn nuts the bearing spacers and the bearing inserts The basic rain gauge assembly includes a removable outer funnel the tipping bucke
6. Acquisition and Engineering Software 4 Communications Based Acquisition Systems A Plug in Cards for Apple IBM Compatibles 4 Datalogging Systems EF Recorders Printers amp Plotters HEATERS 4 Heating Cable 4 Cartridge amp Strip Heaters 4 Immersion amp Band Heaters A Flexible Heaters 4 Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL Metering amp Control Instrumentation Refractometers Pumps amp Tubing Air Soil amp Water Monitors Industrial Water amp Wastewater Treatment pH Conductivity amp Dissolved Oxygen Instruments NIS NJ M2235 0395
7. E SPADE LUG 6 NYLON INSULATED SURGE PROTECTION DIODE 1 5KE27C BARREL SWITCH BEARING NYLON INSERT PRESS FIT SPACER WASHER NYLON 0 44 OD X 0 2 ID X 0 033 THK SCREW 4 40 X 1 4 FLAT HEAD SS SCREW 4 40 X 3 8 PAN HEAD SS WASHER 4 LOCK SS SCREW 6 32 X 3 8 PAN HEAD SS WASHER 6 FLAT SS WASHER 6 LOCK SS SCREW 10 32 X 1 2 PAN HEAD SS SCREW 10 32 X 3 PAN HEAD SS NUT 10 HEX SS NUT 10 ACORN NYLON WASHER 10 FLAT SS WASHER 10 LOCK SS RIVET 1 8 X 1 4 ALUM B gt A O O WARRANTY rants this unit to be free of defects in materials workmanship and to give satisfac tory service for a period of 13 months from date of purchase OMEGA Warranty adds an addition al one 1 month grace period to the normal one 1 year product warranty to cover handling and shipping time This ensures that OMEGA s customers receive maximum coverage on each product If the unit should malfunction it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge However this WARRANTY is VOID
8. can be calibrated by placing an amount of water equal to one tip into the bucket and adjusting the bucket stop on the opposite side of the gauge until the bucket tips and empties its water To move the bucket stop screw first loosen the hex nut on the outside of the rain gauge The nut keeps the screw locked into place With the nut loosened the screw can be rotated by hand or by using a screw driver set into the head of the screw The screw should only be rotated by a small amount between each test Use a large rotation of the screw only if the bucket is out of calibration by a large number of counts Note that moving the bucket stop screw upward means that less water is needed to tip the bucket and moving the screw downward increases the amount of water needed to tip the bucket For inches of rain the amount of water needed for a single tip equal to 0 01 inches is 8 24 milliliters For a 1 millimeter tip the amount of water is 32 43 milliliters Add the amount of water needed to each of the buckets separately and adjust the corresponding stop screws as needed to obtain a single tip form each bucket Several adjustments of each calibration screw may be necessary as there will be some influence from each of the buckets upon the other as the adjustments are changed If there is repeatability in the tip with the calibrated amount of water then the adjustment screw has been correctly set and can be locked into place Use the hex nut located on the adjustm
9. cket tips causing a momentary closure of the reed switch and sending an electrical signal to the event recorder or other data collection device The precipitation sample is discharged out of the gauge at the same time Chapter 4 Calibration The rain gauge is calibrated at the factory Recalibration should not be necessary unless damage during shipment or mishandling during installation has occurred If the damage is extensive the gauge may need to be repaired or replaced before it can be used properly Verify the calibration by using a calibration bottle a graduated cylinder or a calibrated burette The calibration is verified by allowing a known volume of water to flow into the funnel at a rate of 1 to 2 inches per hour producing a specific number of bucket tips Before putting the volume of water into the funnel run some water into the gauge to wet the funnel and the buckets The gauge calibration test must be made while the gauge is wet Do not wipe off any water especially from the buckets between tests and calibration screw adjustments Add the measured amount of water at the specified flow rate refer to Table 1 The bucket should tip within the published gauge tolerances and should give the calculated number of tips within the gauge accuracy If the number of counts is not within the gauge accuracy then the bucket stops must be adjusted to increase or to decrease the amount of water needed to tip the buckets The individual buckets
10. ent screw at the outside the rain gauge base to lock the screw into position Take care and do not allow the screw to rotate as the nut is being tightened In case the screw has turned slightly retest the tip of the bucket after the nut has been tightened Table 1 Standard Calibration Quantities 260 2501M 1 mm std Cal 32 43 milliliters 260 2501M 5 mm Cal 16 215 milliliters 260 2501 01 std Cal 8 24 milliliters 260 2501 05 41 2 milliliters Flow rate for calibration 1 2 ml per second Accuracy desired is 4 of volume at 1 6 inches precipitation per hour After making changes to the bucket stop screws retest the rain gauge operation using the calibration bottle and a large volume of water to produce 50 to 100 tips at a rate of 1 to 2 inches per hour Remember to thoroughly wet the funnel and buckets first The total number of tips generated should correspond to the volume of water run through the gauge expressed in milliliters 1 quart 946 3 milliliters divided by the calibration quantity indicated in milliliters in Table 1 A tolerance of 6 or better should be obtained through testing using this method A more accurate test can be made in the lab using controlled conditions and more accurate test equipment Chapter 5 Maintenance Rain gauges require regular maintenance Gauges located in heavily forested areas or where airborne debris is a consideration should be serviced more often The bucket asse
11. er hour Switch magnetic sensitive 3 W 28 Vac Construction Fabricated parts anodized aluminum Fasteners stainless steel except for aluminum rivets Mounting 3 legs 1 4 diameter bolt holes on a 9 1 2 diameter bolt circle Dimensions 8 4 D x 15 H Shipping weight 8 lbs Optional Accessories Wind Screen Alter Type Model RG 952 Event Recorder Drum Chart Model RG 952 Calibrator Bottle Model RG 2596 Digital Event Counter Model RG 2596 Chapter 2 Installation 2 1 Site Requirements Finding the best possible site for the gauge is important and careful consideration should be given to the quality of precipitation catch prior to the final installation The most accurate rainfall measurements are made in sheltered areas that block wind and eddy currents in the vicinity of the gauge The best exposures are often found in orchards or openings within a grove of trees bushes or shrubbery Fences or other objects can act together to serve as an effective windbreak As a general rule in such areas the heights of the objects and the distance from the gauge should be uniform The height of nearby objects above the gauge should not exceed about twice their distance from the gauge Individual or small groups of isolated objects near a gauge may set up serious eddy currents Since it is not always possible to select sites that provide adequate protection from adverse wind effects an open site away from isolated objects may be the only location a
12. fE RG 2501 Series LY Tipping Bucket Rain Gauge PE e Operator s Manual An OMEGA Technologies Company OMEGA An OMEGA Technologies Company Servicing USA and Canada Call OMEGA Toll Free USA Canada One Omega Drive Box 4047 976 Bergar Stamford CT 06907 0047 Laval Quebec H7L 5A1 Telephone 203 359 1660 Telephone 514 856 6928 FAX 203 359 7700 FAX 514 856 6886 Sales Service 1 800 826 6342 1 800 TC OMEGA Customer Service 1 800 622 2378 1 800 622 BEST Engineering Service 1 800 872 9436 1 800 USA WHEN TELEX 996404 EASYLINK 62968934 CABLE OMEGA Servicing Europe United Kingdom Sales and Distribution Center 25 Swannington Road Broughton Astley Leicestershire I LE9 6TU England Telephone 44 1455 285520 FAX 44 1455 283912 The OMEGA Complete Measurement and Control Handbooks amp Encyclopedias Temperature Data Acquisition Systems Pressure Strain Force Electric Heaters Flow and Level Environmental Monitoring pH and Conductivity and Control Call for Your FREE Handbook Request Form Today 203 359 RUSH MSS0395FVR1B Unpacking Instructions Remove the Packing List and verify that you have received all equipment including the following quantities in parentheses RG 2501 Tipping Bucket Rain
13. mbly and drain screens should be inspected to ensure they are clean and free from debris such as leaves and insects The tipping buckets should be carefully wiped clean to remove mud and dirt Inspect the small tube of the main funnel and remove any obstructions inside it Test the gauge for correct operation and accuracy of the tipping buckets Refer to Section 4 Annually or after 6 months of heavy operation put a drop of light machine oil onto each rotating part specifically the bucket assembly shaft at the bearings Should the tipping bucket fail to rotate freely about its axis check the two small right angled brackets that hold the shaft and the bearings onto the main mounting bracket These two brackets can become loosened or misaligned causing the shaft to bind The brackets edges should be at the same level Severe friction will create excessive wear in the plastic bushings resulting in the magnet making contact with the switch and stopping the bucket assembly from tipping Replace worn 5 or damaged bushings Too many bushings may cause the bucket shaft to bind as well If a bushing needs to be removed remove it from the side away from the mapnet and switch allowing more room between the magnet and switch The number of bushings will vary from gauge to gauge depending upon variations in the materials used Typically there are four bushings on each side of the shaft Check the magnetic switch for proper operation The standard swi
14. t assembly the magnet and switch assemblies and the outer housing assembly The main sensor assembly with the tipping buckets switch magnet and signal terminal block is mounted onto a bracket that is fastened to the base plate Two adjustable screws provide the calibration of the buckets by changing the position of the bucket stop point Three adjustable legs allow the gauge to be fastened permanently onto a platform or deck using standard fasteners Slots in the legs provide some adjustment for leveling the gauge A two conductor shielded cable with a wire size between 18 and 24 AWG should be used to connect the rain gauge output into the monitoring or recording equipment A two position terminal block is provided for attaching the cable into the switch Power for operating the switch originates within the monitoring recording equipment and is typically a pulse ranging from 5 to 12 VDC The Model RG 2501 and RG 2501M rain gauges are not available in heated versions for use in cold climates These two gauges are designed and sold as low cost general purpose rain gauges and are best suited for standard rainfall measurements only Refer to the NovaLynx catalog or contact the company to obtain information regarding other types of rain gauges that are available for more specialized uses 1 2 Specifications a Capacity unlimited Orifice 8 20 cm diameter Calibration 0 01 1 mm 0 5 mm 0 25 mm Accuracy 4 for rainfall rates of 1 to 6 p
15. t all during a precipitation event check for debris in the inlet funnel and drains that might be blocking bucket movement If the gauge registers high during precipitation check the level bubble indicator to ensure the sensor is properly installed and leveled Recheck calibration Whenever the gauge is to be used with an electro mechanical counter or event recorder surge protection diodes must be installed between the gauge and the equipment Failure to install these diodes will result in a stuck magnetic switch due to electrical interference from the counter or recorder solenoids Some gauges have been shipped with these diodes installed across the signal terminal block inside the gauge If it appears that the diodes have not been included on your gauge and that they will be needed for your application please contact OMEGA and arrange to have a set of diodes sent one set per gauge jOfW9 LIMON SNIddll DILJNOVW HOLIMS QILVW3H2S 3711 I QNO23S 390 019 1VOldAL NAWIXV IGA S41 WAWIXVIN SLLVM 20 ZZ L3NOVN HOLIAS 30010 WOIdAL NOILDALOYd 39 5 220 1300W 340 ATIVWYON 318V9 14 SZ HOLIMS OILJNDOVW o JV NIWH3L Nld c OMA 40 4 133HS 00 2 092 10 09 3ovsn 1300W YSLNNOOD dO NOLLO3IOMd FJOYNS HOLIMS 1 OL YO HOLIMS 39nVv9 OL j9nv9
16. tch closure is a momentary single pole normally open SPNO contact Connect an ohmmeter to the gauge at the signal cable terminal strip With the bucket assembly at rest upon one of the calibration screws the ohmmeter should read infinite resistance Slowly move the bucket assembly to simulate a rain event until the bucket assembly has fully rotated As the magnet passes over the end of the barrel switch the resistance of the switch should change to a short zero or less than one ohm As the tipping bucket comes to a complete tip and rests upon the other calibration screw the ohmmeter will again read an infinite resistance Upon completion of all testing and maintenance replace the funnel into the gauge housing Confirm that the gauge is still level by checking as described in Section 2 3 In order to maintain the accuracy of the rainfall catch the rim of the funnel should be protected from dents or other damage that might alter its shape Chapter 6 Troubleshooting If it becomes necessary to correct an operation problem always perform the following step first Check the cable connections to ensure a solid connection A loose or faulty cable is often the problem to missing data Next check to see that the bucket assembly moves freely upon its pivoting shaft Make sure that the magnet has not become loose and is securely in place on the bucket Check to ensure proper contact closure Refer to Section 5 4 If the gauge registers low or not a
17. top of the gauge The gauge housing must be mounted as level as possible on its platform The holes in the mounting legs are sized for 1 4 diameter mounting bolts For correct measurement of precipitation the open end edge of the rain gauge funnel must lie in a horizontal plane This can be tested by laying a carpenter s level across the top edge of the gauge funnel using two 90 directions one direction crossing the other at right angles If the top is not level in both directions the condition should be corrected Washers can be used as leveling shims between the mounting legs on the gauge and the platform or tower mounting plate Place the bug and debris screens into place inside the funnel Upon completion of the rain gauge mounting route the signal cable to the monitoring recording equipment Use the most direct route possible avoiding sharp or jagged objects that may rub against the cable jacket during high winds causing exposure of the wires Attach the cable to the structure or support using plastic wire ties or other appropriate devices When using plastic wire ties use only black ultraviolet resistant wire ties placing them at a spacing of two to three feet along the cable length for best results whenever possible the signal cable should be routed through conduit Chapter 3 Operation Precipitation entering the collection orifice fills the calibrated tipping bucket assembly When the calibrated amount has been collected the bu
18. ult from the use of the products in accordance with the information contained in the manual SPECIAL CONDITION Should this equipment be used in or with any nuclear installation or activity purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatso ever arising out of the use of the equipment in such a manner RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the OMEGA ENGINEERING Customer Service Department BEFORE RETURNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID PROCESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence FOR WARRANTY RETURNS please have the FOR NON WARRANTY REPAIRS OR CALIBRA following information available BEFORE con TION consult OMEGA for current repair tacting OMEGA calibration charges Have the following infor 1 RO number under which the product was mation available BEFORE contacting OMEGA PURCHASED 1 P O number to cover the COST of the 2 Model and serial number of the product repair calibration under warranty and 2 Model and serial number of product and 3 Repair instructions and or specific prob 3 Repair instructions and or specific problems lems
19. vailable Wind Shields help minimize loss of precipitation catch by breaking up the air flow immediately over the gauge funnel Wind effects on catch losses are much greater during snowfall than rainfall Windshields are not generally installed at gauge site locations where snowfall constitutes less than 20 of the mean annual precipitation Good exposures are not always permanent The growth of vegetation trees and shrubs can change an excellent exposure into an unsatisfactory one within a relatively short time Sites should be inspected and groomed regularly In areas where heavy snowfall occurs rain and snow gauges are mounted onte supports tower at a height well above the average snow level A location with this type of exposure would be improved if the tower can be located within an area of trees of comparable height 2 2 Installation The RG 2501 rain gauge may be shipped from the factory with the three mounting legs attached upside down on the 1 4 20 bolts If this is the case detach and replace the legs into the correct position with the legs pointing downward and the leg end facing outward away from the gauge Refer to the assembly drawing Be sure the leg mounting bolts are tightly fastened Carefully remove all packing material and any tape foam pieces or rubber bands used to keep the tipping bucket from moving during shipment Operate the tipping bucket to verify that the bucket can now move freely Place the funnel into the
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