Hach 9531600, User Manual, Page: 6 / 10

Table 1 Display icons
Icon Description
Shows the battery power level. Flashes when the battery power is less than 10%.
Shows when the lock feature is on. When the lock feature is on, the parameter value on the display does not change.
Push to set the lock feature to on or off.
Shows when the tester is in calibration mode.
Keypad description
Figure 5 shows the keypad. Table 2 gives the key descriptions.
Figure 5 Keypad overview
1 Power key 2 Calibration/Settings key 3 Lock key
Table 2 Key functions
Key Description
Push and hold to set the power to on or off.
Push to start a calibration. To exit a calibration, push and hold.
Push and hold until "SEt" shows on the display to go to the settings menu. To exit the settings menu, push and hold
until "End" shows on the display. When in the settings menu, push to scroll through the settings.
Note: Power cannot be set to off while in settings or calibration mode.
Push to set the lock feature to on or off. When the lock feature is on, the lock icon shows and the parameter value on
the display does not change.
Calibration
C A U T I O N
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective equipment
appropriate to the chemicals that are handled. Refer to the current safety data sheets (MSDS/SDS) for safety
protocols.
Calibrate the tester before initial use and when:
• Results drift
• Results are not accurate
Before the initial calibration and after a dry storage, soak the sensor for several minutes in the sample or tap
water.
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