Maintenance Schedule - Hach WPC-21 Manual Del Usuario

Identify the analog input values
Push the F1 until "Input 1/Input 2" shows, then push ENTER. The voltage supplied by the auxiliary
instrument connected to each analog input shows. This information is not buffered in stand alone
mode but it can be retrieved in network mode.
Calibration
The instrument cannot be calibrated by the user. Contact the manufacturer for instrument calibration.
Refer to the label on the instrument for the calibration due date.
Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.

Maintenance schedule

Table 12 shows the recommended schedule of maintenance tasks. Facility requirements and
operating conditions may increase the frequency of some tasks.
Task
Calibration on page 19
Clean the instrument on page 19
Clean the sensor flow cell
Replace the desiccant pack
Replace a fuse on page 21
Clean the instrument
Clean the exterior of the instrument with a moist cloth and a mild soap solution and then wipe the
instrument dry.
Clean the sensor flow cell
Do not insert the cleaning brush into the sample line fitting when the sensor flow cell is dry or damage to the
sensor flow cell may occur.
Periodically, clean the sensor flow cell. In addition, clean the sensor flow cell before use if the
instrument has not been used for a long time.
Items to collect:
• Factory supplied cleaning brush
• Clean water
1. Open the enclosure door. Loosen all four captive screws that attach the enclosure door.
2. Set the power switch to off.
3. Stop the flow of water to the instrument.
4. Remove the sample line and drain line from the compression fittings.
1
Required to keep compliance with JIS B 9925-1997 standards
W A R N I N G
Table 12 Maintenance schedule
on page 19
on page 20
N O T I C E
1 year As necessary
1
X
X
X
X
X
English 19