11066 Searchpoint Optima Plus v2.indd - Merkantile

MAN0551.P65 Issue 06 - 03/042108M05015. COMMISSIONINGOption A) System Test Using FORCE’d 4-20mA(1) The easiest way of performing system level functionaltests is to use the SHC-1 interrogator to FORCE the 4-20mA output to currents that are just above therelevant alarm thresholds.(2) The FORCE 4-20mA option is available from theCALIBRATE menu. Using this option, FORCE the 4-20mA output to a current just above the A1 alarmthreshold. For example, with an A1 of 20% LEL, acurrent of 7.5mA should suffice. Verify that the systemreports and responds as intended to this A1 signal.(3) FORCE the 4-20mA output to a current just above theA2 alarm threshold. With an A2 of 60% LEL, a currentof 14mA should suffice. Verify that the system reportsand responds correctly to this A2 signal.(4) RELEASE the 4-20mA output. Confirm that the systemreturns to normal, with no active alarms or faults.Option B) System Test Using GasIf system level functional tests must be performed using gas,test gas concentrations at least 5% LEL (ideally 10% LEL)above each alarm threshold are required in order to allow forsystem tolerances.(1) Using either the gassing cover or the remote gassingcell, apply test gas to the detector at the concentrationrequired to reliably exceed the A1 alarm threshold. Forexample, with an A1 alarm threshold of 20% LEL, theminimum nominal test gas concentration should be25% LEL (ideally 30% LEL). Verify that the systemresponds as intended to an A1 signal generated in thismanner.45