Hach QuikChem 8500 2 Series, Operations

Page: 14 / 54

8. Set the power to the power strip to off.
Note: If a lower set-point temperature is not given in the software, the heater controller stays at the original set
temperature. If the method makes it necessary for a temperature higher than 60 ºC (140 ºF), lower the
temperature setting to 60 ºC (140 ºF) or less before power is removed from the system.
Troubleshooting
Do a pump test
Do the steps that follow to make sure that the pump speed is correct.
1. Use an accurate watch or chronometer to measure the time for the pump to make 10 revolutions.
2. Remove all pump cartridges from the pump. Look for the index marks as shown in Figure 11 .
Index marks let the pump revolutions be counted. Manually move the rollers to find the index
mark on the roller mounting. If either mark is hard to read, make new index marks with a marker.
3. Attach a new green-green pump tubing. Make sure that the tension lever is set correctly at the
12 o'clock (vertical) position.
4. Set the pump power to on. Push NORMAL RUN . The display must show a speed of 35 to
continue this test. If the display shows anything else, refer to the installation manual.
5. Use an accurate watch or chronometer to measure the time for the pump to make 10 revolutions.
Make sure the time is 50 seconds ±1 second.
6. If the recorded time is less than 49 seconds or more than 51 seconds, contact technical support
or a local sales representative for assistance.
Figure 11 Index marks on the pump
1 Index mark that turns with the rollers 2 Stationary index mark
14 English