Laserfiche WebLink
• Once the CALIBRATION: OK message appears on the pDR-1200 display,stop <br /> the pump and disconnect the zeroing filter cartridge from the cyclone inlet(or <br /> remove pDR-1200 from clean bench/room). <br /> • The pDR-1200 is now zeroed and ready for a measurement run. <br /> Note:While the pDR-1200 is used to monitor high dust concentrations (>_ 0.5 <br /> Mg/M3),the flow through its sensing chamber should not be stopped before <br /> purging it,which can be done by connecting the green zeroing filter to the <br /> cyclone inlet and continuing to run the pump for about 2 minutes before <br /> shutting it off.This is to prevent dust contamination of the sensing <br /> chamber. <br /> 6.6 pDR-1200 Filter Holder Installation <br /> The 37-mm filter holder provided with the pDR-1200 must be installed before <br /> operation of the instrument, in order to connect a sampling pump.To install the <br /> filter holder,remove protective cover, and insert the open collar over the black <br /> attachment cup with the external o-ring, on the left side of the pDR-1200 sensing <br /> chamber. Ensure complete insertion. <br /> To replace the membrane filter separate the two sections of the plastic holder prying <br /> them apart with screwdriver or a coin. Make sure to place backing under the <br /> membrane filter before rejoining the two plastic rings. <br /> 7.0 OPERATING MODES <br /> The persoiialDataRAM has several different operating modes which will be <br /> described in what follows. The specific commands and displays within each of <br /> these operating modes will be explained in detail in Section 8.0. A complete flow <br /> chart of keystrokes and screens is provided in Section 16.0. <br /> 7.1 Start-Up Mode <br /> The personalDataRAM enters the Start-Up Mode as soon as the instrument is <br /> switched on. The user then has the choice to: <br /> a) Wait before proceeding; <br /> b) Zero the instrument and check its readiness; or <br /> c) Proceed directly to the Ready Mode. <br /> 7.2 Ready Mode <br /> Once the personalDataRAM is in the Ready Mode, the user is presented with the <br /> following alternatives: <br /> a) Start a run immediately,or after any of the subsequent steps; <br /> b) Review (by scrolling the display) all operating parameters, status and <br /> diagnostic data; <br /> 15 <br />