Hach EZ Serie Manuel De L'utilisateur page 24

Component Description
Peristaltic Sets the pump to on and off to examine the operation. If there is no flow,
pump(s) examine if there is a blockage in the pump tubing between the two pump
halves. Keep the drain pump set to on during the test to let fluids drain.
Micropump(s) Sets the micropump to on and off to examine the operation. If the micropump
does not operate during the start-up, there may be a blockage in the
micropump duckbill (e.g., caused by calcium carbonate). Carefully flush the
micropump with a syringe filled with demineralized water while the micropump
is active. Enter a number of pulses and push Pulse. If the blockage continues
and the micropump does not activate, replace the micropump duckbills. Refer
to
Dispenser(s) Examine the dispensers operation with the empty and filling button. If the
Emergency stop button was pushed, startup the dispensers with the INIT
button.
Drain/Level pinch Sets the pinch valve and drain pump to on and off to examine the operation.
valve(s) When the pinch valve is set to off and the drain pump is set to on, the analysis
vessel is drained. When the pinch valve and the drain pump are set to on, the
level procedure is done. If the component is not operating correctly, make sure
that the tubing is not clogged or there is a blockage. Examine the tube position
in the pinch valve. The tubing in the rear side is for level procedure. The tubing
in the front is for drain procedure.
Stirrer Sets the stirrer to on and off to examine the operation.
Colorimetric Do the steps that follow to examine the operation:
sensor
1. Fill the analysis vessel with water.
2. Set the voltage of the sensor output to 9.5 V.
3. Do a calibration.
4. Absorbance output value is ~0 mAU.
5. Drain the analysis vessel.
6. Absorbance output value is approximately 300 mAU.
If there is no difference in the result values, the photometer operation is not
correct.
Titrimetric and Do the steps that follow to examine the operation:
ion-selective
1. Do a calibration.
analyzer unit
2. Drain the analysis vessel.
Stream selection Sets the stream selection valve to on and off to examine the operation.
valve(s)
7.2 Do an input/output signal test
Do a test on the analyzer inputs/outputs before the unit is put into operation.
1. On the analyzer display, push F2 > RIGHT arrow.
A list with all of the installed components shows. Refer to
24 English
Replace the micropump duckbills on page 33.
Figure 9.