11066 Searchpoint Optima Plus v2.indd - Merkantile

MAN0551.P65 Issue 06 - 03/042108M05015. COMMISSIONINGa. If there are any ACTIVE FAULTS, the cause(s) ofthese must be identified and remedied before theunit will become fully operational.b. If there are any ACTIVE WARNINGS, the unit canoperate correctly despite the warning(s). However,for reliable long term operation it is stronglyrecommended that problems causing warnings arefixed before a unit is fully commissioned.5.2.2 Gas Response Testing (SHC-1 & Multimeter)The procedure for testing gas response as part of thecommissioning process is described below:-(1) Select the DISPLAY mode on the SHC-1 HandheldInterrogator. Check that the displayed gas reading is0.0% LEL. If the displayed gas reading is not 0.0%LEL, check that their is no background gasconcentration present, the optics are clean and freefrom condensation and that the unit has been givensufficient time to stabilise in it’s intended operatingenvironment. (For best results, it is recommended thata unit is left powered up for one hour before performingzero or span calibration / test activities.)(2) Using the SHC-1 interrogator, put the detector intoINHIBIT (this will prevent gas readings from beingsignalled on the 4-20mA output).(3) Making use of either the gassing cover, or the remotegassing cell (where fitted), perform a functional gastest. The procedure for performing functional gas testsis detailed in Section 5.5. For a nominal 50% LEL testgas concentration, the displayed reading should bebetween 45% LEL and 55% LEL. (If necessary, testgas concentrations between 20%LEL and 95%LEL canbe used with the same +/- 5% LEL test tolerance.)43