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User Guide
Heavy Duty Dissolved Oxygen Meter
Model 407510
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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/oF for 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. RECORD key
6. RECALL key
7. Factor adjust key
8. Probe head
9. Sensor body
10. Sensor plug
11. RS-232 output jack
12. Battery cover (rear)
13. Altitude compensation key
14. O2 Cal key
15. Zero key
16. Mg/L (DO), O2 (Air) selection key
17. % Salt key
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Dissolved Oxygen (DO) Measurements
Measurement Preparation
Before taking measurements, perform the calibration described above if necessary. In addition,
perform the % SALT and ALTITUDE compensation adjustments as described below:
% SALT Compensation
Slide the O2/DO switch to the DO position. If the measured liquid is pure water or is known not to
have a salt content, set the % Salt factor to 0%.
1. Press the % Salt key. The display will indicate 0% on the middle portion of the LCD display
and S on the bottom portion of the LCD.
2. Pressing the Factor Adj. key once will add 1% to the salt factor.
3. Press the Factor Adj. key until the correct factor is displayed.
4. Press the % Salt key to store the factor.
ALTITUDE Compensation
The meter has a default calibration for sea level operation (0 meters). Any significant deviation
from sea level requires a compensation adjustment. Perform the following steps to do so:
1. Press the ALTITUDE key and the display will indicate a 0 in the middle of the LCD and an
H on the lower portion of the LCD.
2. Press the Factor Adj. key once to add 100 meters, twice to add 200 meters, and so on.
Maximum compensation is 3900 meters.
3. Once the desired compensation is displayed, press the ALTITUDE key again to store the
value.
Taking Measurements
1. Immerse the probe in the solution under test. For best automatic temperature compensation,
immerse the probe to a depth of at least 4" (10 cm).
2. Wait until the display stabilizes.
3. The velocity of the liquid coming into contact with the probe must be at least 40 to 60 ft/min
(0.2 to 0.3 m/s). If the solution is standing, stir the solution with the probe or use an agitator.
4. Rinse the probe with clean water after each use.
Oxygen in Air (O2) Measurements
Follow the same steps above for DO measurements except for the variations described below:
1. Slide the O2/DO switch to the O2 position.
2. The display will indicate the oxygen air value in %.
Temperature Measurements
The lower display will indicate the temperature of the measured solution. Press the oC/oF key to
change the temperature units.
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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. For streaming of data to a PC via the RS232 Output
jack, the optional 407001-USB kit (RS232 to USB cable and driver CD) along with the 407001
software (available free at www.extech.com) are required.
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Probe Storage
For short term storage, the probe should be stored in a moist environment to keep the membrane
from drying out and needing replacement. Moisten the sponge with distilled water in the protective
cap. Do not store it directly in the water since that could encourage algae growth on the probe.
Probe Head Replacement
The probe head on the tip of the probe holds a thin Teflon® membrane and an electrolyte
container. Calibration or reading errors could indicate loss of electrolyte or a dirty/damaged
membrane. The membrane is very delicate and can easily be damaged if it comes in contact with
solid objects. Replacement probe heads are available from your local distributor.
Replacement procedure
1. Unscrew the probe head and electrolyte container from the probe handle and discard.
2. Fill the new probe head/electrolyte container with electrolyte.
3. Screw the probe head onto the probe handle. Excess electrolyte may be forced out through the
threads. Wipe clean.
4. Lightly tap the probe to remove any air bubbles.
1. Probe handle
2. Temperature sensor
3. Probe Head
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Battery Replacement
The low battery indication LBT appears on the LCD when the battery runs low.
To replace the battery:
1. Remove the meter's rubber protective cover to access the rear battery compartment.
2. Remove the battery compartment cover using a small coin or screwdriver and remove the 9V battery.
3. Replace the 9V battery and reinstall the cover and holster.
You, as the end user, are legally bound (Battery ordinance) to return all used batteries and
accumulators; disposal in the household garbage is prohibited!
You can hand over your used batteries / accumulators at collection points in your community
or wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at the end
of its lifecycle
Specifications
General Specifications
Circuit Custom one-chip LSI microprocessor circuit
Display Dual function 13 mm (0.5") 1999 count LCD w/ contrast adjust
Measurements Dissolved O2: mg/l (milligrams per liter); Oxygen in air: %; Temperature:
Data hold Data hold key freezes displayed reading
Sensor Structure Remote Polarographic Dissolved Oxygen Sensor
Data recording Min/Max/Avg readings stored for later recall
Auto power off Meter turns off after 10 minutes
Sample rate 0.4 Sec (approx.)
Data Output RS 232 PC serial interface
Operating conditions Temperature: 0 to 50 °C (32 to 122 °F); Humidity: < 80% RH
Battery power 9V alkaline battery
Power Consumption Approx. 6.6 mA DC
Weight 335 g / 0.74 lbs.(including batteries & probe)
Dimensions Main instrument: 180 x 72 x 32mm (7.1 x 2.8 x1.3")
Accessories Carrying case, 9V battery, and 5 membranes
Optional accessories Membranes, data acquisition software & RS232 interface cable
Electrical Specifications
Measurement Range Resolution Accuracy
Dissolved Oxygen 0.0 - 19.9 mg/L 0.1mg/L + 0.4 mg/L
Oxygen in air 0 - 100% O2 0.1 % O2 + 0.7% O
Temperature (probe
only)
Compensation
adjustments
All rights reserved including the right of reproduction in whole or in part in any form.
°C/°F
Temperature sensor: Precision thermistor
Probe: 190x28mm (7.5" x 1.1") length/diameter
32 to 122 oF
0 to 50 oC
Temperature (automatic) 0 to 50oC (32 to 122 oF)
Salt 0 to 39%
Altitude 0 to 3900 meters
0.1oF/C ±1.5 oF
Copyright © 2014-2015 FLIR Systems, Inc.
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+ 0.8 oC
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