Extech Instruments 407510 User manual

User's Manual

Heavy Duty Dissolved Oxygen Meter

Model 407510

Model 407510 Ver. 2.1 May 2003

Introduction

Congratulations on your purchase of Extech's Heavy Duty Dissolved Oxygen / Temperature

Meter which simultaneously displays Dissolved Oxygen, 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.

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit

Display Dual function 0.5" (13 mm) 1999 count LCD w/ contrast adjust

Measurements Dissolved O2: mg/l (milligrams per liter); Oxygen in air: %;

Temperature: °C/°F

Data hold Data hold key freezes displayed reading

Sensor Structure Remote Polarographic Dissolved Oxygen Sensor

Temperature sensor: Precision thermistor

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: 32 to 122 °F (0 to 50 °C); Humidity: < 80% RH

Battery power 9V alkaline battery

Power Consumption Approx. 6.6 mA DC

Weight 0.74 lbs. / 335 g (including batteries & probe)

Dimensions Main instrument: 7.1 x 2.8 x1.3" (180 x 72 x 32mm)

Probe: 4.9" x 0.8" length/diameter (125 x 20mm)

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% O20.1 % O2+0.7% O2

Temperature

(probe only)

32 to 122 oF

0 to 50 oC

0.1oF/C ±1.5

+0.8 oC

Temperature (automatic) 32 to 122 oF (0 to 50oC)

Salt 0 to 39% (1% = ppt)

Compensation

adjustments

Altitude 0 to 3900 meters

Model 407510 Ver. 2.1 May 2003

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 top

10 Sensor body

11 Sensor plug

12 Sensor jack

13 RS-232 output jack

14 Battery cover (rear)

15 Altitude compensation key

16 DO/O2key

17 Zero key

18 O2calibration key

19 % Salt key

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 O2/DO selector to the O2position.

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.

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

7. Press the O2Cal key and the display will indicate approx. 20.9 (typical O2in air).

Model 407510 Ver. 2.1 May 2003

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 Son 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.

NOTE: 1% = 10 ppt (parts per thousand)

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 0.6 to 1

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 O2position.

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.

Model 407510 Ver. 2.1 May 2003

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 O2position.

2. Turn the meter OFF and disconnect the DO probe.

3. Press and HOLD the O2key and then press the POWER key.

4. Release the O2key 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. 407000. This kit enables the user to

capture, store and display readings using a PC.

Model 407510 Ver. 2.1 May 2003

Membrane & Electrolyte Replacement

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.

Replace the electrolyte or the membrane as follows:

1. Unscrew the tip and well assembly from the probe handle and drain the old electrolyte

2. Unscrew the probe tip.

3. Remove the white O-ring, remove the old membrane and then carefully install the new

membrane and secure with the O ring.

4. Replace the tip on the well.

5. Fill the well to approximately the half way point with new electrolyte.

6. Screw the tip and well assembly back onto the probe handle. Excess electrolyte may be

forced out through the threads. Wipe clean.

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

Probe

Handle

Fill here

Electrode

Well

Membrane

O ring

Tip

Model 407510 Ver. 2.1 May 2003



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: repair@extech.com

Website: www.extech.com

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.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer service for

details on services available. Extech recommends that calibration be performed on an annual

basis to ensure calibration integrity.

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and

workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If

it should become necessary to return the instrument for service during or beyond the warranty period, contact the

Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website at

www.extech.com (click on ‘Contact Extech’ and go to ‘Service Department’ to request an RA number). A Return

Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible

for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does

not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of

specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any

implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,

incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The

warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied.

the right of reproduction in whole or in part in any form.

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