Extech Instruments DO700 Manual de usuario

User's Guide

Digital Dissolved Oxygen,

Conductivity, TDS and pH Meter

Model DO700

DO700-en-GB_v2.3 3/15

Introduction

Congratulations on your purchase of the Extech DO700 meter. For best results, please read the

entire manual before use. The DO700 measures Dissolved Oxygen (DO), Conductivity, pH, mV,

and temperature parameters. Conductivity measurements also yield TDS (total dissolved solids),

Salinity, and Resistivity readings.

The built-in microprocessor provides automatic calibration, automatic temperature compensation,

data storage, and self-diagnostics. The digital filter improves measurement speed and accuracy.

The meter offers a backlit LCD display and is dust-proof and waterproof, meeting IP57.

This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable

service.

pH Features

The meter can recognize up to 13 types of pH standard buffer solutions. Two special pH modes

(for distilled water and distilled water mixed with ammonia) are provided. These special modes

offer general slope compensation and non-linearity solution temperature compensation suitable

for the electric power and petrochemical industries.

Conductivity Features

Automatic frequency conversion and voltage regulation increases the Conductivity electrode

range (K = 1 to 10 times). One point Conductivity calibration allows measurements from 0 to

100mS/cm. Up to 8 types of Conductivity standards can be recognized.

The meter has an automatic range feature with non-linear temperature compensation for distilled

water with Conductivity values lower than 10uS/cm greatly improving accuracy and suitable for

the microelectronics and pharmaceutical industries.

Dissolved Oxygen Features

The latest technology DO electrode offers a temperature and salinity sensor with automatic

temperature compensation and automatic salinity compensation as well as manual barometric

pressure compensation.

DO700-en-GB_v2.3 3/15

Supplied Equipment List

DO700 Meter

Dissolved Oxygen, Conductivity, and pH Electrode

Standard pH buffer solutions (4.00pH, 7.00pH, and 10.01pH) / 50ml

Standard Conductivity solution (1413µS/cm) / 50ml

Standard Dissolved Oxygen solution (30ml)

Dissolved Oxygen Membrane cap for DO electrode

Cathode polishing paper

Screwdriver (for removing battery compartment cover)

Batteries (2 x ’AA’ 1.5V)

User’s Guide

Carrying Case

Meter Description

1. LCD Display (detailed in section below)

2. Rubber protective jacket (remove to access the rear battery compartment)

3. Keypad (detailed in section below)

4. Electrode connection jack

5. Electrode plug

6. Electrode cable

DO700-en-GB_v2.3 3/15

Display Description

1. Measurement type icons

2. Measured reading

3. 888 (Stored data serial number), M+ (measurement to be stored icon), RM (reading to be

recalled icon)

4. Units of measure

5. Temperature reading

6. Stable measurement icon

7. Calibration icons

8. Low battery icon

Keypad Description

ON/OFF Power Key

Calibration Key

a) When taking a measurement, press this key to enter the calibration mode

b) When in the programming mode, press this key to change the displayed number or the

ON/OFF state

Mode Key

a) In pH measuring mode, one short press switches between pH and mV measuring

modes. One long press (>2s) enters the parameter setting mode. Subsequent presses

will scroll through the available parameters.

b) In other measuring modes, press to enter the parameter setting modes. The meter will

scroll through the available parameters

Backlight and ENTER Key

a) In the measurement mode, momentary presses toggle the backlight on and off

b) When in the programming or calibration mode, press to ENTER data

c) When in the pH mode, press and hold to change the resolution 0.01 to 0.1pH

d) When in the Conductivity mode, press and hold to scroll through the TDS, Salinity,

Resistivity, and Conductivity modes

e) When in DO mode, press and hold to select the unit of measure (mg/L > ppm > %).

Release the key when the desired unit is displayed

MEMORY STORE and RECALL Key

a) In the measurement mode, momentary presses store the displayed readings. Press and

hold for at least 2 seconds to recall a saved reading

b) In programming mode, press to change the displayed number or ON/OFF state

DO700-en-GB_v2.3 3/15

Store, Recall, and Clear Datalogger Memory

STORE Readings

The meter can store up to 100 DO, 100 pH, 100 mV, and 100 Conductivity readings for a total of

400 data points. To store a reading, wait until the reading stabilizes (the smiling face icon

appears when the reading stabilizes). Press the M+/RM key momentarily to store a reading. The M+

icon appears and the data point serial number increments.

RECALL Readings

In the measurement mode, press the M+/RM key to recall the most recently stored reading. RM and

the data point serial number for the displayed reading will appear on the LCD. The measurement

information will appear on the lower right hand side of the LCD. Use the CAL or M+/RM buttons to

scroll the remaining stored readings. Press the ENTER key to return to the normal measurement

mode.

CLEAR Readings

From the RECALL mode, press and hold the ENTER key for at least five (5) seconds. The LCD

display will show ‘CLR’ indicating that all of the stored readings have been erased. The unit will

automatically return to the normal measurement mode after approximately 2 seconds.

DO700-en-GB_v2.3 3/15

pH Measurement Mode

Preparation for Measurement

1. Unscrew the protective cap on the probe jack located on the bottom of the meter (store the

protective cap in the carrying case for later use).

2. Carefully connect the pH probe to the meter’s probe jack. The probe can only be inserted in one

orientation. Once it is firmly connected, screw the probe collar onto the meter to secure the

probe.

3. Turn the meter on using the power key .

4. Press the MODE key momentarily to switch to the pH mode only if the meter is in the mV mode.

Otherwise, the unit of measure should already display pH units.

3-Point Calibration (7.00pH, 4.00pH and 10.01pH)

1. Press the CAL key to enter the Calibration mode. The meter’s display will show a blinking ‘C1’

2. Rinse the probe in distilled water, allow it to dry, and submerge it into a pH 7.00 buffer solution.

Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is reached

3. Press CAL again and the display will show a blinking ‘7.00’

4. This portion of the calibration procedure is complete when the display stops blinking and shows

the ‘C2’ icon. The unit will automatically switch to the second point of the calibration

5. Rinse the probe in distilled water again, allow it to dry, and submerge it into a pH 4.00 buffer

solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is

reached

6. Press CAL again and the display will show a blinking ‘4.00’

7. This portion of the calibration procedure is complete when the display stops blinking and shows

the ‘C3’ icon. The unit will automatically switch to the third point of the calibration

8. Rinse the probe in distilled water again, allow it to dry, and submerge it into a pH 10.01 buffer

solution. Stir the solution briefly and allow it to stay in the buffer solution until a stable reading is

reached

9. Press CAL again and the display will show a blinking ‘10.01’

10. After the display stabilizes the 3-point calibration icon will appear

1-Point and 2-Point Calibration

A one or two point calibration is acceptable if the expected measurement result is known.

For example, if the expeced pH is 4pH, it is acceptable to perform only a 1-Point Calibration (4pH).

If the expected measurement is between 4.00pH and 7.00pH, the user can perform a 2-Point

Calibration (4.00 and 7.00pH), and so on.

For a 4pH calibration, only the circled L will appear on the LCD. For a 7.00pH, only the circled M will

appear on the LCD. For a 10.01pH Calibration, only the circled H will appear (Low, Medium, and

High).

For all other applications, a 3-Point Calibration is recommended. Always perform a 3-Point

Calibration on new probes and probes that have been in use for long periods. This maximizes

measurement slope linearity.

Press the ENTER key to exit the Calibration mode.

DO700-en-GB_v2.3 3/15

Testing the pH of a Sample

1. Perform the pH Calibratoin as described above

2. Rinse and dry the pH Probe and submerge it in a sample liquid

3. Stir the solution briefly with the probe and allow it to stand until the display stabilizes

4. Note that the closer the temperature of the sample solution to the calibration solution, the more

accurate readings

Programming pH Parameters

The Table below shows the available programming menu items P1 ~ P7. Each parameter is

explained in detail in the subsequent sections.

Parameters Code Selections

P1 pH buffer solution series selection

s ol

USA (Europe &

U.S.A)

NIS (NIST)

CH (China)

Distilled water pH temperature

compensation setting (see notes

below this Table) OFF / ON

Distilled water with Ammonia pH

temperature compensation setting

(see Notes below this Table) OFF / ON

P4 Temperature unit setting ℃/ ℉

P5 Back light display time setting 0-1-3-6min

P6 Auto power off setting 0-10-20min

P7 Restore to default factory settings OFF / ON

Notes on P2 and P3 Parameters: Measurements of distilled water and distilled water mixed with

ammonia affect the temperature compensation and the slope linearity of the pH probe. Such

measurements are sometimes used in the electrical power and petrochemical industries. Set these

parameters to ON only if necessary, otherwise leave these parameters in the OFF state.

DO700-en-GB_v2.3 3/15

Parameter P1 (pH Buffer Solution Setting)

1. From the pH measurement mode, press and hold MODE for at least 2 seconds and then

release, the ‘P1’ icon appears on the LCD.

2. Use the CAL or the M+/RM keys to toggle through the three (3) selections: USA (for use in the

USA or Europe, NIS (for NIST calibration purposes), and CH (for use in China).

3. Momentarily press MODE to move to the next parameter (P2), or press ENTER to return to the

normal measurement mode.

Parameter P2 (Distilled Water Temperature Compensation Setting)

1. From the P2 menu, use the CAL or the M+/RM keys to turn this feature ON or OFF.

2. Momentarily press MODE to move to the next parameter (P3), or press ENTER to return to the

normal measurement mode.

Parameter P3 (Distilled Water with Ammonia Temperature Compensation Setting)

1. From the P3 menu, use the CAL or the M+/RM keys to turn this feature ON or OFF.

2. Momentarily press MODE to move to the next parameter (P4) or press ENTER to return to the

normal measurement mode.

Parameter P4 (Temperature Measurement Units Setting)

1. From the P4 menu, use the CAL or the M+/RM keys to turn this feature ON or OFF.

2. Momentarily press MODE to move to the next parameter (P5) or press ENTER to return to the

normal measurement mode.

Parameter P5 (Display Backlight Setting)

1. From the P5 menu, use the CAL or the M+/RM keys to select 0, 1, 3, or 6 minute default

backlighting time.

2. Momentarily press MODE to move to the next parameter (P6) or press ENTER to return to the

normal measurement mode.

Parameter P6 (Automatic Power OFF Setting)

1. From the P6 menu, use the CAL or the M+/RM keys to select a 0, 10, or 20 minute Auto Power

OFF time.

2. Momentarily press MODE to move to the next parameter (P7) or press ENTER to return to the

normal measurement mode.

Parameter P7 (Restore Factory Default Settings)

1. From the P7 menu, use the CAL or the M+/RM keys to select ON (reset the factory default

settings) or OFF (cancel edit).

2. Momentarily press MODE to move to the first parameter (P1) or press ENTER to return to the

normal measurement mode.

DO700-en-GB_v2.3 3/15

pH Measurement, Calibration, and Electrode Considerations

Error messages ERR-1: Electrode zero potential error and ERR-2: Electrode slope error; For

either error, check the following:

1. Air bubbles in the electrode bulb. Shake rigorously to remove air bubbles

2. Accuracy of the pH buffers used in calibration. Replace buffers if necessary

3. Set meter to its factory default state in Parameter P7 (previous section of manual)

Calibration intervals depend on the sample, the electrode performance, and the required

accuracy. For high accuracy measurements (≤±0.02pH), the meter should be calibrated

immediately before taking a measurement. For general accuracy (≥±0.1pH), the meter can be

calibrated and used for approximately one week before the next calibration.

The meter must be recalibrated in the following situations:

1. New probe, or probe that is unused for a long period of time

2. After measuring acids (pH<2) or alkaline solutions (pH>12)

3. After measuring a solution that contains fluoride or a concentrated organic solution

4. If the solution’s temperature differs widely from the calibration solution temperature

The soaking solution contained in the supplied protective bottle is used to maintain activation in

the glass bulb and junction. Loosen the capsule, remove the electrode and rinse in distilled

water before taking a measurement. Insert the electrode and tighten the capsule after

measurements to prevent the solution from leaking. If the soak solution is turbid or moldy,

replace the solution.

To prepare a soak solution: Use 25g pure KCL dissolved with purified water and diluted to

100mL. The electrode should not be soaked in a distilled water protein solution or an acid

fluoride solution for long periods of time. In addition, do not soak the electrode in organic silicon

lipids.

For calibration accuracy, the pH of the standard buffer solution must be reliable. The buffer

solution should be refreshed often, especially after heavy use.

For best accuracy, always keep the meter clean and dry, especially the meter’s electrode and

electrode jack. Clean with medical cotton and alcohol if necessary.

The sensitive glass bulb at the front of the combination electrode should not come in contact

with hard surfaces. Scratches or cracks on the electrode will cause inaccurate readings. Before

and after each measurement, the electrode should be washed with distilled water and dried. Do

not clean the glass bulb with a tissue for it will affect the stability of the electrode potential and

increase the response time. The electrode should be thoroughly cleaned if a sample sticks to

the electrode. Use a solvent if the solution does not appear clean after washing.

Electrodes that have been used over a long period of time, used in a strong solution that has

damaged the sensitive bulb, or used with a substance resulting in a jam at the junction will be

become passivated; the sensitivity will decrease, its response will slow, and the readings will be

inaccurate. Replace the electrode as soon as possible in these cases.

For abnormal readings, try calibrating again; if the problem persists replace the Electrode. The

user can also try resetting the meter to factory default conditions per Parameter P7 (detailed in

an earlier section). Electrode life can be shortened by heavy use, extreme conditions, and

improper maintenance.

DO700-en-GB_v2.3 3/15

mV Measurement Mode

1. Unscrew the protective cap on the probe jack located on the bottom of the meter (store the

protective cap in the carrying case for later use).

2. Carefully connect the pH probe to the meter’s probe jack. The probe can only be inserted in

one orientation. Once it is firmly connected, screw the probe collar onto the meter to secure

the probe.

3. Turn the meter on using the power key .

4. Press the MODE key momentarily to switch to the mV mode.

5. Immerse the electrode in the sample solution, slowly stir the solution with the electrode and

then allow it to rest in the solution.

6. When the smile face icon appears on the LCD, the reading has stabilized.

mV Programming Parameters

Prompt Parameters Code Settings

P1 Back light display time

0 -1-3-6 min

P2 Auto power off time

0 -10-20 min

Parameter P1 (Display Backlight Setting)

1. Press MODE to access the P1 Parameter.

2. Use the CAL or the M+/RM keys to select 0, 1, 3, or 6 minute default backlighting time.

3. Momentarily press MODE to move to the next parameter (P2) or press ENTER to return to

the normal measurement mode.

Parameter P2 (Automatic Power OFF Setting)

1. From the P2 menu, use the CAL or the M+/RM keys to select a 0, 10, or 20 minute Auto

Power OFF time.

2. Momentarily press MODE to move back to Parameter P1, or press ENTER to return to the

normal measurement mode.

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