Extech 407510 Operating Manual

User's Manual

Heavy Duty Dissolved Oxygen Meter

Model 407510

Introduction

Congratulations on your purchase of Extech's Heavy Duty Dissolved Oxygen / Temperature
Meter which simultaneously displays Dissolved Oxygen or Oxygen in air, and Temperature.
Units of measure are mg/l for Dissolved Oxygen, % for Oxygen in air, and

oC/o

temperature. Oxygen is measured with a remote sensor that also contains a thermistor for
measuring temperature. Advanced features include RS 232 PC serial interface, data hold, auto
shut off, and Min/Max/Avg recording.

Meter Description

1. LCD Display

2. POWER ON/OFF key

3. Data HOLD key

4. °C/°F selection key

5. LCD Contrast Adjust

6. RECORD key

7. RECALL key

8. Factor adjust key

9. Probe head

10. Sensor body

11. Sensor plug

12. Sensor jack

13. RS-232 output jack

14. Battery cover (rear)

15. Altitude compensation key

16. O

Cal key

2

17. Zero key

18. O

calibration key

2

19. % Salt key

F for

2

407510 V7.0 10/06

Getting Started

Note: The dissolved oxygen probe assembly may be shipped to you
from the factory dry. If the probe does not contain electrolyte
solution, refer to the Electrolyte Replacement section of this manual
for the instructions for adding the electrolyte solution prior to initial
use.

Filling the Electrolyte Container Prior to Initial Use

1. Unscrew and remove the electrolyte container from the tip of
the probe.

2. Fill the electrolyte container with new electrolyte.

3. Screw the electrolyte container back onto the electrode
holder and probe handle. Excess Electrolyte may be forced
out through the threads. Wipe clean.

4. Lightly tap the probe to remove any air bubbles.

Calibration

For first time use or after long periods (several days) of non-use, calibrate the instrument using
the following steps. The procedure should be performed in an open, well-ventilated area.

1. Ensure that the sensor is DISCONNECTED from the meter.

2. Turn ON the meter.

3. Slide the O

4. Press the zero key to null the meter (the display should indicate "OO").

5. Connect the DO sensor to the top of the meter (remove the plastic probe head
protective cap).

6. Allow the meter to stand for at least five minutes until the display stabilizes.

7. Press the O

/DO selector to the O2 position.

2

Cal key and the display will indicate approx. 20.9 (typical O2 in air).

2

3

407510 V7.0 10/06