Hach 29971-72 Benutzerhandbuch Seite 11

For the first intallation, tighten the fitting by hand. Use the wrench to tighten the fittings another ¼
turn.
2. Install the purge gas outlet with the supplied short length plastic tube. Put the plastic tube in the
orifice opposite the purge gas inlet and push firmly. To remove the tube, push on the ring around
the tube and pull.
3. Make sure that there is no loss of purge gas supply while the sensor is in a liquid sample and
always when the sensor is in line. If necessary, use a backup purge gas cylinder and an
automatic change-over valve, which operates when the first cylinders gas supply has expired.
Change-over valves are frequently known as flip-flop valves and are available from local gas
regulator suppliers.
4. Examine the purge gas flow rate as follows:
a. Connect the sensor to the instrument. Set the instrument to on. The inner solenoid valve in
the sensor opens and lets the gas to flow.
b. Put the open end of the exit tube in water.
c. Adjust the gas flow rate so that there is a minimum of three bubbles each second.
d. Remove the exit tube from the water.
Note: Do not keep the exit tube in the water, because water can go back in the tube and cause damage to
the CO sensor.
2
Install a regulator and filter (optional)
When the beverage package sampler is used for analysis of the CO
sensor is used. TC sensors must have a constant supply of purge gas for operation. The regulator
keeps a constant pressure of the purge gas to the TC sensor.
Use the optional ORBISPHERE model 29089 regulator and filter to make sure that the purge gas is
dry and kept at a correct pressure. The regulator is connected in-line with the purge gas supply,
directly to the purge gas entry port of the TC sensor. Install the regulator with the supplied stainless-
steel tubing connected to the CO
Obey the flow direction: from left to right (with the gauge in the front). Refer to
A gauge on the regulator shows the pressure of the gas. Turn the pressure adjuster knob on the top
of the unit to adjust the pressure of the purge gas. Refer to
gas pressure.
Make sure to drain the condensate at periodic intervals for a correct compressed air filter
maintenance. Open the condensate bleed screw to blow the moisture with pressure. Refer to
Figure 6.The filter is made of sintered metal. An O-ring keeps the filter in the correct position when
the filter bowl is removed. Clean or replace the filter if the filter becomes heavily contaminated. Use
rinsing water and compressed air to clean the filter.
or N sensor. Make sure to install the regulator vertical (±5%).
2 2
or N content of a liquid, a TC
2 2
Figure
Specifications on page 3 for the correct
6.
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