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• Position one of the two gasketed (soft rubber) sensing chamber cover plates <br /> provided in the conversion kit on the front side of the sensing chamber. Insert <br /> and tighten the included socket head screw firmly making sure that the plate is <br /> aligned perfectly with the top of the sensing chamber.Similarly, attach the other <br /> cover plate on the back side of the sensing chamber; <br /> • Identify the two black cups of the pDR-ASC conversion kit. One of them has an <br /> external o-ring(filter holder cup), and the other has no o-ring(cyclone cup); <br /> refer to Figures 2 and 4 for the location of these cups on the pDR-1200 sensing <br /> chamber.These cups can be installed on either side of the sensing chamber,i.e., <br /> the cyclone can be either on the left or the right side of the sensing chamber <br /> (Figure 2 shows the case where the cyclone is on the right side); <br /> • Attach one cup to the left side of the sensing chamber using the two black socket <br /> head screws.Tighten screws firmly. Similarly, attach the other cup to the right <br /> side of the sensing chamber; <br /> • Take the cyclone/filter holder unit provided as part of the conversion kit, and <br /> separate the 37-mm plastic filter holder from the metal cyclone by firmly pulling <br /> the two units apart; <br /> • Carefully slide the large open end of the plastic filter holder over the cup with <br /> the external o-ring,previously attached to the sensing chamber. Ensure that the <br /> cup is fully inserted into the filter holder; <br /> • Carefully insert the large diameter open end of the metal cyclone into the other <br /> cup on the opposite side of the sensing chamber. The cyclone inlet(small short <br /> metal tube on side of cyclone) can be oriented as desired (upwards, as shown in <br /> Figure 2,sideways, downwards,etc.). Ensure that the cyclone is fully inserted <br /> into the cup; <br /> • When ready to operate, connect a length of tubing between the barbed fitting at <br /> the downstream end of the plastic filter holder and the pump to be used in <br /> combination with the pDR-1200. <br /> • Perform a zeroing sequence (see Sections 6.5.2 and 8.1) before starting a run. <br /> This completes the conversion of the pDR-1000AN to the pDR-1200. <br /> 15.2 Conversion Procedure from pDR-1200 to pDR-1000AN <br /> To effect this conversion use model pDR-UB conversion kit. As you remove parts <br /> from the pDR-1200,in order to attach the conversion kit components, store these <br /> parts carefully for possible future re-conversion. Proceed as follows: <br /> • Pull off both the cyclone and the filter holder from their respective cups on the <br /> two sides of the sensing chamber; <br /> • Loosen the two screws that hold each of the two cups on the sides of the sensing <br /> chamber (total of 4 screws), and remove the two side cups; <br /> • Loosen the single screw on each of the two (front and back) gasketed sealing <br /> covers enclosing the sensing chamber, and remove the two covers; <br /> • Identify the two flat sensing chamber cover plates provided in the conversion <br /> kit;one face of each of each of these two plates has a dull black finish <br /> (antireflective);avoid touching those surfaces; <br /> 34 <br />