Hach HQ440d Basic User Manual page 11

Figure 8 Probe connection
Standard operation
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.
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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.
2. Select, create or delete a sample ID:
Option Description
Current ID Select an ID from a list. The current ID will be
associated with sample data until a different ID is
selected.
Create a New Sample Enter a name for a new sample ID.
ID
Delete Sample ID Delete an existing sample ID.
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