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 magnet 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 switch 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 at 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.

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Omega RG-2501 manual Troubleshooting
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RG-2501 specifications

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