Hach LANGE HQ440d Basic User Manual page 9

Option Description
Date Use the and
Time Use the and
The current date and time will be shown on the display.
Connect a probe after the date and time setup, so that the meter is ready
to take a measurement.
Connect a probe
1. Make sure the display shows the current time and date. Refer to
Change the date and time on page 8.
Note: The time stamp for a probe is set when the probe is first connected to the
meter. This time stamp makes it possible to record the probe history and record
the time when measurements are made.
2. Plug the probe into the meter
3. Push and turn the locking nut to tighten.
Figure 8 Probe connection
keys to enter the current date.
keys to enter the current time.
(Figure 8).
Standard operations
About calibration
Each probe uses a different type of calibration solution. Make sure to
calibrate the probes frequently to maintain the highest level of accuracy.
Note: For step-by-step instructions, refer to the documents that are included with
each probe.
The calibration icon can indicate that:
• the calibration timer has expired
• the LDO sensor cap should be replaced
• the calibration is out of range
• the calibration results are outside acceptance criteria settings
About sample measurements
Each probe has specific preparation steps and procedures for taking
sample measurements. For step-by-step instructions, refer to the
documents that are included with the probe.
About check standards
Run Check Standards verifies equipment accuracy by measuring a
solution of a known value. The meter will indicate if the Check Standard
passed or failed. If the Check Standard fails, the calibration icon
shown until the probe is calibrated.
The meter can be set to automatically show a reminder for check standard
measurement at a specified interval with a specified acceptance criteria.
The reminder, value of the check standard, and acceptance criteria can
be changed. For step-by-step instructions, refer to the documents that are
included with the probe.
Use a sample ID
The sample ID tag is used to associate measurements with a particular
sample location. If assigned, stored data will include the sample ID.
1. Push the key.
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