- Before you start, make sure the pump is switched off. Lift the flowmeter to a vertical position.
- Close the sample valve by turning it clockwise as far as it goes.
- If the process is not pressurized (600 ... 1200 mbar), continue from step 3. If the process is pressurized (1.2 ... 20 bar), detach the flexible tube from the flowmeter. See Figure 1.
- Remove the inlet/outlet plugs.
- Insert the 1/4" tubing into the IN fitting. Tighten the nut 11/4 turns with an open-ended, 14-mm spanner to make a gas-tight fitting. In future, only slight tightening with an open-ended spanner is needed to make a gas-tight fitting. Insert the tubing into the OUT fitting, if needed.
- If the process is not pressurized, turn on the pump. If the process is pressurized, do not turn the pump on.
- Adjust the sample flow using the sample valve, for example, 150 l/h = 2.5 l/min.
- Turn on the MI70 indicator.
- Set the pressure to represent the sample pressure. For instructions, see Configuring pressure settings.
- Wait until the reading has stabilized.
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After the measurements, turn off the pump, remove the tubes, and put the inlet/outlet
plugs back into their places.
CAUTION Be careful when taking samples from hot processes. Do not touch the hot sampling lines without suitable protective clothing. The measured dew points must always be lower than the ambient temperature or DSS70A probe temperature to avoid condensation in the system. If condensation occurs, stop sampling and dry the system by circulating ambient air in the system. Prevent liquids from entering the DSS70A sampling line as this may damage the product.