17
Installation
3.8 Connecting sample lines
Measurements can be taken on a continuous or sample by sample basis. In either mode, the
instrument must be connected to the sample line as follows:
1. The sample inlet and outlet connections on the instrument are located on the ON/OFF
sample flow valve (refer to Figure 5 on page 14 and enlarged in the diagram below):
2. Connect the inlet and outlet tubing to the sample source and to the drain, respectively. The
diagram above, shows the valve in the OFF position. To turn the sample flow fully ON, turn
the valve counter-clockwise until it clicks into position (about 1/8th of a turn). To remove any
residual air bubbles from the sample line, turn the valve to the PURGE position for 5
seconds before turning to the ON position.
Note: A length of stainless steel tubing is supplied in the tool kit (4mm instrument) and can be used instead
of plastic tubing on the outlet valve if the pressure in the instrument is high enough to cause excessive
movement of the plastic tubing.
3. If the sample contains particles, it is recommended to use a filter on the inlet tube to avoid
any clogging of the sample flow. The filter (including a box of 10 meshes) is contained in the
tool kit supplied with the instrument. It is also available separately as spare part number
DG33216 (4mm instrument), DG33317 (6mm instrument) or DG33318 (1/4 inch instrument)
and the set of 10 meshes as spare part number DG33217.
4. Control the sample flow using the adjustment valve located above the sample flow valve.
Refer to Figure 5 on page 14.
Flow rate guidelines:
• For cans and bottles the minimum recommended flow rate is 150mL/min. For small volume
packages a lower flow rate can be used but this should not be below 100mL/min.
• For tank and in-line applications the recommended flow rate should be above 200mL/min
and up to a maximum of having the flow adjustment valve fully open.
Note: The flow rates indicated with arrows on the flow meter (as illustrated below) are approximately
150mL/min (lower arrow) and 200mL/min (upper arrow). The silver bead gives an indication of the flow rate.
1. Sample inlet
2. Sample outlet
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