407510 Datasheet, PDF (5/8 Pages) Extech Instruments Corporation. – Heavy Duty Dissolved Oxygen Meter

Advanced Features
Data Hold
Press the Data Hold key to freeze the displayed value. The LCD will display DH for Data Hold
mode along with the held reading. Press the Hold key again to release the data hold function.
MIN/MAX/AVG Data Recording
When selected, the Data Recording function records the Min, Max, and Average readings. To
start a data recording session:
1. Press the RECORD key once. The REC indicator will appear on the display and the meter
will begin to record the lowest (min), highest (max), and average (avg) readings.
2. To recall the data, press the RECALL key once. The MAX indicator will appear along with
the highest reading recorded since the RECORD key was pressed.
3. Press the RECALL key again to view the MIN value.
4. Press the RECALL key again to view the AVG reading.
5. To exit the Record mode, press the RECORD key again. The display indicators REC,
MIN, MAX, and AVG will disappear.
Auto Power OFF
The meter includes an Auto shut off feature that preserves battery life. The meter will
automatically turn off if no function button is pressed in any 10 minute period. To disable this
feature press the RECORD key to engage the record function.
LCD Contrast Adjust
It may be necessary to adjust the display contrast due to a change in viewing angle or voltage
drift. Use the LCD Contrast adjustment located on the right side of the meter to set the
preferred contrast.
CPU Reset
Certain improper keystroke sequences can cause the meter to “hang” and become inoperable.
The following procedure will reset the meter.
1. Slide the O₂/DO switch to the O₂ position.
2. Turn the meter OFF and disconnect the DO probe.
3. Press and HOLD the O₂ CAL key and then press the POWER key.
4. Release the O₂ CAL key and then press the ZERO key.
5. Connect the DO probe.
6. Wait several minutes for the reading to stabilize and then press the O2 CAL key.
RS-232 PC Interface
The meter includes a RS-232 serial data port. This interface was designed to operate with the
Extech Data Acquisition Software/Hardware kit Part No. 407001. This kit enables the user to
capture, store and display readings using a PC.
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407510 V7.0 10/06