Hach DR 3900 Betriebsanleitung Seite 12

Installation of the Pour-Thru module
1. Open the cell compartment.
1
2. Connect the /8 in. Cell Inflow and Outflow Tubes to the Pour-Thru
Cell (Figure 1).
3. Wipe the Pour-Thru Cell with a lint-free cloth and insert it fully into
the cell holder.
4. Connect the Inflow Tube to the fitting at the bottom of the glass
funnel and clamp the glass funnel to the stand. Minimize the tubing
length to eliminate air bubbles and improve flow.
5. Connect the Outflow Tube to the top fitting of the stand pipe.
Minimize the tubing length to eliminate air bubbles and improve
flow.
Note: Make sure there are no kinks in tubes that will impair flow and
retain bubbles.
6. Connect the Drain Tube (rubber tube) to the bottom fitting of the
stand pipe and clamp the stand pipe to the stand.
7. Connect the free end of the Drain Tube to an appropriate waste
vessel.
Note: The drain tube must flow freely to the waste vessel. Keep the
drain pipe horizontal and below the outlet of the stand pipe. Shorten
tubes to minimize flow restrictions.
8. To ensure proper drainage for the funnel, adjust the relative heights
of the stand pipe and funnel as shown in
height determines the speed of sample flow through the cell. The
higher the funnel, the faster the flow. To minimize air bubbles,
adjust the funnel so that it drains completely with the final level of
liquid in the tube.
9. Pour 25 to 50 mL of deionized water into the funnel and allow the
funnel to drain. If necessary, move the stand pipe up or down until
the funnel drains smoothly and stops draining at the correct level
English 12
Figure 1. The funnel
Use of the Pour-Thru Cell
The Pour-Thru Cell is intended primarily for those methods that
specifically call for its use. These use liquid reagents and are typically
denoted as ULR or Rapid Liquid methods. These methods obtain
maximum benefit from the Pour-Thru Cell by avoiding turbidity from un-
dissolved reagents and provide the precision and sensitivity required to
determine very low concentrations. These methods require no
modification when the Pour-Thru Cell is used.
It is possible to use the Pour-Thru Cell for other methods, with a few
minor modifications. The cell requires a minimum volume of 25 mL for
proper flushing of any previous solution from the cell - so methods that
utilize a 10 mL sample volume cannot be used directly. Tripling the
sample and reagent volumes on these methods (or use of 25 mL
reagents and sample volumes) will provide enough liquid to use the cell
The methods listed in Table 1 require extra rinsing or purging of the
Pour-Thru Cell with deionized or distilled water between samples.
Table 1 Methods that require additional purging
Aluminum, Aluminon Chlorine Dioxide, LR
Copper, Porphyrin Hardness, Calmagite
Nickel, PAN Nitrate, MR
The Pour-Thru Cell can also be used for the Nessler Method for
Ammonia and TKN if cleaned properly. Clean the cell by pouring a few
sodium thiosulfate pentahydrate crystals into the cell. Rinse out the
crystals with deionized water.
Cobalt, PAN
Manganese, LR, PAN
Nitrate, HR