Diagnostic Test For Calibration Solution Delivery; Diagnostic Test For Low Reagent Pressure; Diagnostic Indicators - Hach 5500sc Maintenance And Troubleshooting Manual

3. Collect the reagent from each valve.
4. Measure the volume that was collected.
5. If one valve dispenses less volume than the other valves, look for a blockage in the tubing or
valve.
6. If one valve dispenses more volume than the other valves, replace the valve. Make sure that the
reagent pressure is correct.

Diagnostic test for calibration solution delivery

1. Push diag, then select PERFORM TEST>CAL SOL. DELIVERY.
2. Set the calibration solution valve(s) to supply solution for 1 minute (60 seconds).
3. Collect the calibration solution from the valve(s).
4. Measure the volume that was collected.
5. Compare the measured volume to the specified volume for 1 minute: 55 mL to 300 mL.
Note: The volume collected in 1 minute is the flow rate.
6. If the measured volume is not between 55 mL and 300 mL, replace the applicable valve.

Diagnostic test for low reagent pressure

1. Put the analyzer in shutdown mode. Refer to
2. Push diag, then select PERFORM TEST>AIR PUMP.
3. Change the settings that follow.
• SETPOINT: 4.00 psi
• LOW DEADBAND: 0.00 psi
• HIGH DEADBAND: 1.00 psi
• SET LOW VALUE: 5.00 psi
• SET HIGH VALUE: 6.00 psi
4. Select START. The test starts. The reagent bottles become fully pressurized.
5. Monitor how frequently the air pump operates during a 5-minute period.
6. If the air pump operates only one time in 5 minutes, the reagent pressure is good. Put the
analyzer back into operation.
7. If the air pump operates more than one time during a 5-minute period, stop the test and complete
the steps that follow.
a. Open the lower door.
b. Fully tighten the caps on the reagent bottles and compression nuts.
c. Make sure that all of the tubes are installed correctly.
d. Make sure that the air manifold fittings are installed correctly and are fully tightened.
e. Close the lower door.
f. Start the air pump test again.
g. If the air pump operates more than one time in 5 minutes, more inspection is necessary.

Diagnostic indicators

The display background and the status indicator light will change to red when an error occurs and to
yellow when a warning occurs.
• Error—red display background and status indicator light. A significant problem occurred that
affects the instrument operation. The current measurement stops and the analyzer goes into
shutdown mode.
• Warning—yellow display background and status indicator light. An event occurred that can cause
a future problem. The analyzer continues to operate.
12 English
Put the analyzer in shutdown mode on page 4.