How it Works
Extech
Loading...
DO700
Operating Manual
26 pgs426.94 Kb0
Data Sheet
1 pgs217.26 Kb0

Extech DO700 Operating Manual

User's Guide
Digital Dissolved Oxygen, Conductivity, TDS and pH Meter
Model DO700
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 dust­proof 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.
2
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
3
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 Dissolved Oxygen or Conductivity mode, press to enter the P1 programming
parameter. Subsequent presses will scroll through the available parameters
b) In pH mode, momentary presses toggle between pH and mV modes. Press and
hold the MODE key to enter the P1 programming parameter. Subsequent presses 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
4
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 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.
appears when the reading stabilizes). Press the M+/RM key momentarily to
5
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.
6
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
USA (Europe &
P1 pH buffer solution series selection
Distilled water pH temperature
P2
compensation setting (see notes
below this Table)
Distilled water with Ammonia pH
P3
temperature compensation setting
(see Notes below this Table)
P4 Temperature unit setting
sol
U.S.A) NIS (NIST) CH (China)
OFF / ON
OFF / ON
℃ / ℉
P5 Back light display time setting
P6 Auto power off setting
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.
7
0-1-3-6min
0-10-20min
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.
8
Loading...
+ 18 hidden pages
Buy Points How it Works FAQ Contact Us Questions and Suggestions Privacy Policy Cookie Policy Terms of Use