Endress Hauser Gammapilot M FMG60 Pulse Rate

J

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john

In our plant we using Endress hauser Gammapiolt M FMG60 instrument for meauring level in Hutch. The problem is When I conducted background calibration avg pulse rate is getting 1800 cps. after I conducted empty calibration pulse getting zero. Normally in good condition empty calibration avg pulse will be 18000cps. Can any help me solve this problem please?
 
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