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What happened to our Hardy Instrument after we lost power?

Last updated 08/04/2014 03:42 AM

Question

Last week during severe weather we lost power in the plant. After power was restored we had an issue with one of our Hardy Instruments. What could have happened to our Hardy Instrument after losing power?

Answer

There are a couple of things that might happen if you suddenly lose power to your HI 1746WS, HI 1756WS, HI 1756-2WS, HI 1756FC, HI 1769WS, HI 1769-2WS, HI 1771WS,  HI 2110WI, HI 2151/30WC, HI 3010, HI 3030, HI 3300, HI 3600, HI 4050, HI 4060 or your obsolete HI 2151/20WC or HI 2160RC Hardy Instrument:

1. If your instrument lost its configuration after a power failure it is possible that the configuration was never saved to non-volatile memory. This would require the unit be re-configured after any power loss. To prevent this you should verify that a save command is performed after any calibration.

2. Another possible problem would be that the memory has become corrupted. During a power failure the power normally doesn't just turn off, it will go through a brown-out stage first with a lower voltage level. During this time of a lower voltage to your instrument, memory can get corrupted. If this happens your instrument may exhibit strange behavior and you will need to go back to factory default settings to clear your RAM memory. There are additional WebTech answers that explain how to go to factory default settings, depending on which model you have. Search on the word "default".

Re-configuring and re-calibrating would normally overwrite the corrupted data and your instrument would go back to operating normally. This corruption would be completely random and intermittent. For example, it may effect one channel of a two channel card without any indication of a problem on the other channel.

NOTE: If the module memory has been corrupted, doing a re-configuration may or may not overwrite the initial corruption. The module may operate correctly until the corrupted register is accessed and at that time it could show problems. If this is the case, the module should be returned to factory default settings and then re-configure it.