EDT directION QP451 Instruction manual

QP451 Portable pH Meter –
Quick User Guide

QP451 Portable pH Meter - Quick User Guide
Thank you for choosing the QP451 Portable pH meter from EDT directION. This guide will enable you
to quickly set up and use the instrument.
Description
Series 4 instruments have a dynamic LCD display which guides the user through the calibration and
measurement process. We hope there will be no need to refer to a manual once you have
performed initial set up.
Unpacking
Verify you have received all of the equipment ordered. If you have any questions please contact EDT
directION Ltd or your agent.
Check the package for any signs of damage. If there are any signs of rough handling in transit please
report it to the agent immediately. Provide photographic evidence if possible. Damage should be
reported within 7 days of receipt.
Note: The carrier will not honour any claims unless all shipping material is saved for their
examination. Once removed save all packing material in the event that re shipment may be
necessary.
Packing List:
If you ordered the QP451 Meter only option the package will only contain the QP451 Portable pH
Meter and 4 X AA Batteries. If you ordered the QP451 Portable pH Meter Kit the following items are
packed in the case:
Tough carry case, QP451 Meter, 4 x AA Batteries, E8080 pH combination Electrode. ATC/Temp
probe, pH 4 and 7 Buffer Solutions, user Guide, USB data stick, Mini USB data cable.
- Power (On/Off)
- Contrast/Backlight
- Mode
- Calibrate
- Logging and Printing
- Read/Accept
-Navigate the Menu
-Set Up Menu

Setting up
Battery installation. (refer to figure 1)
Remove the battery cover by loosening the retaining cross head screw. Please note this screw has a
retainer and will therefore remain with the cover to prevent loss.
Once open unpack the 4 AA Batteries supplied and insert ensuring the polarity is correct for each
battery.
Replace the cover.
Setting the Time and Date.
1. Switch the unit on using the on/off button.
2. Press the right arrow Key to Enter the PARAMETERS ADJUST SCREEN
3. Scroll down to the DATE FORMAT option and press READ until you arrive at the desired
format.
4. Scroll down to the CLOCK option using the down arrow key.
5. Press READ to enter the CLOCK screen.
6. Select CANCEL using the down arrow Key and press READ until the current DATE
in the entry box is removed. Select the current date digit by digit by selecting the correct
number and pressing READ.
7. When the entry box contains the correct date select ENTER and press READ.
8. You are now in the TIME screen. Repeat from 5 above to select the correct time.
9. From the PARAMETERS ADJUST screen press READ to return to the pH Mode.
Calibration and Measurement
Accurate pH measurement requires that you do not cross contaminate buffers and samples. Before
using the pH probe ensure it is rinsed with deionised water and blotted dry. Repeat this procedure
when transferring between all standards and samples.
1. Connect the pH Electrode to the BNC connector on the top rear of the instrument.
2. Connect the ATC probe Jack into the 3.5 mm Jack socket next to the BNC socket.
3. Press the on/off switch. The display will light up.
4. The meter is now in the pH mode. Press CAL to start calibration.
Figure 1

5. Insert the pH Probe and ATC electrode into the pH7 Buffer solution and press READ
6. The auto endpoint indicator will show the progress of the calibration. When stable the
meter will set itself to pH 7.00 (or the corrected value)
7. To use this 1 point calibration press CAL. We recommend a 2 point calibration to do this
rinse the pH Electrode and ATC electrode with DI water, blot dry and immerse into the pH 4
Buffer solution.
8.Press READ to start the second point Calibration.
9. The auto endpoint indicator will show the progress of the calibration. When stable the
meter will set itself to pH 4.00 (or the corrected value)
10. To accept the Calibration check the Slope is over 80% and Press CAL.
11. Remove the pH Probe and ATC from the solution. Rinse with deionised water and blot dry.
12. Insert the pH Probe and ATC Electrode into the sample solution and press READ
13. The auto end point will freeze the display when the reading is stable
14. For further samples repeat from 11 above
Using different or Custom Buffer solutions:
The QP451 comes complete with pH 7 and pH 4 Buffer solutions. These Buffers are automatically set
up in the menu as is pH 10 Buffer. The reference temperatures for these buffers is 25 Degrees C. For
20 degree C Buffers or custom values you will need to enter the Set Up menu:
1. After switching the instrument on press the right arrow set up key.
2. In the PARAMETERS ADJUST screen scroll down to “Buffer Set” and press READ

3. In the “SELECT BUFFER SET” screen select option 2 and press READ to select a pH 4,7 &10
at 20 degrees.
4. 0r Select Option 3 to input custom Buffer values and Press READ
5. In the USER BUFFER SET screen select the option 1 and press right arrow
6. Press the down arrow to select CANCEL. Press READ to remove the current value.
7. To select a custom buffer highlight the value and press READ.
8. When you have the correct value in the ENTRY box select ENTER and press READ.
9. Repeat for Custom buffers 2 and 3. Note: You can still perform 1,2 or 3 point Calibrations. i.e.
you don’t have to use all 3 buffers.
10. Press READ to return to the PARAMETERS ADJUST screen and press READ again to
revert to the pH Mode.
11. To calibrate follow the Calibration procedure above.
Setting the Time and Date.
1. Switch the unit on using the on/off button.
2. Press the right arrow Key to Enter the PARAMETERS ADJUST SCREEN
3. Scroll down to the DATE FORMAT option and press READ until you arrive at the desired
format.
4. Scroll down to the CLOCK option using the down arrow key.
5. Press READ to enter the CLOCK screen.
6. Select CANCEL using the down arrow key and press READ until the current DATE in the
entry box is removed. Select the current date digit by digit by selecting the correct number and
pressing READ.
7. When the entry box contains the correct date select ENTER and press READ.
8. You are now in the TIME screen. Repeat from 5 above to select the correct time.
9.
From the PARAMETERS ADJUST screen press READ to return to the pH Mode
.
Logging and printing
The QP451 Portable pH Meter has both a log and a print function. You can print and log directly to
an external device when connected via the Mini USB output or straight to file. There is capacity to
store 64 files. The oldest will get overwritten if used files are not deleted.
The data logger will accept up to 10,000 data points. If you have selected a log period /log interval
combination that exceeds this you will be advised to amend your parameters.

Saving Sample Readings.
Once you have measured a sample in any mode and the reading is frozen you will be offered the
option to “Press LOG to print immediate”. Press “LOG” to store the reading in the internal
memory. The file will be stored with the name “AD-HOC x “where x is a sequential number
that increases by 1 each time a result is recorded.
Files are accessed by:
- Press right arrow after unfreezing the display. This takes you to the “PARAMETERS
ADJUST” screen.
- Select “Logging and Print set up” and press READ
- Select “REVIEW Files” and press READ
- Select the desired file and press right arrow to reveal the data.
Logging Data
The Series 4 instruments allow the continuous logging of up to 10,000 data points for up to 99 hours
at intervals as small as 1 second.
To log data it is important to “Set Up” the logging parameters:
- Press
right arrow
from any Mode to access the set up page.
- This takes you to the “PARAMETERS ADJUST” screen.
- Select “Logging and Print set up” and press “READ”
- Select User ID and Press “READ”. Input the USER ID details.
- Select “Set Time Interval” and press “READ”. Input time interval.
- Select “Time Period to Log” and press “READ”. Input Time period.
- Select “Filename” and press “READ”. Input File Name.
- Select “CONTINUE” and press “READ”
- Ensure the instrument is Calibrated in the mode you are about to LOG.
- Press “LOG” then Press “LOG” to start logging.
The instrument will start logging immediately. The Screen will display “LOGGING” then go into a low
energy mode to preserve battery life during the measurement.
To terminate the logging prematurely press “ON/OFF”. The display will show “Logging
Aborted”.
When the Logging is finished press “READ” to finish.
To read the logged data:
- Press
right arrow
to enter SET UP page.

- Select “Logging and Print set up” and press “READ”
- Select “REVIEW Files” and press “READ”
- Select the desired file and press
right arrow
to reveal the data.
- To download the data to Excel use the EDT Data Wizard.
The EDT Data Wizard
The Series 4 Portable Meters have the facility to store Readings, Calibration data and Logged data in
its internal memory filing system.
To transfer this data directly into Excel for printing or further manipulation you will need to install
the EDT data Wizard. This is provided in the Series 4 Data Kit which comprises:
- USB flash drive with the EDT data Wizard Software.
Troubleshooting
The QP451 will automatically diagnose and indicate errors or issues on the display.
Most errors in pH measurement will be a s a result of a problem with the pH probe and not the
meter. Please ensure your Electrode is in good condition, has been cleaned and that before every
measurement it is rinsed in deionised water and blotted dry.
Ensure you have sufficient battery power. There is a battery life indicator in the top right of the
display. If there are no solid sections the battery will need replacing. To save battery life reduce the
screen brightness and contrast by selecting the “Lightbulb” button.

Technical Specifications
QP451 Portable pH Meter
pH Range -2 to 16 pH Units
pH Accuracy +/- 0.01 pH units
mV Range and Accuracy +/- 1999.9 mv to +/= 0.1 mV
Commodity Code 90278011
Environment Operates between 0-50 degrees and 0-100% RH
Relative mV mode Sets any solution to 0mV.
Connection BNC for Combined pH Electrode. 3.5 mm Jack for ATC probe
Data Output Mini USB. Outputs csv at 38400 Baud
Data Storage Dynamic Internal storage of up to 64 files. Logging maximum 10,000 data points
Display Backlit LCD Graphic Display
Power requirement
4 X AA Batteries
.
Over 200 Hours continuous use. Power saving features include:
Auto off, Backlight control, logging sleep mode.
Reference Temperature Set at 25 degrees C.
Size 175x88x48mm (lxwxh). Meter Only
Temperature Coefficient Set at 2% Per degree.
Temperature Range 0 to +105 Degrees Centigrade
Weight 350g Meter Only

Contact Us
For Help and Technical Support take a look at our support pages on www.edt.co.uk or contact us:
Tel: [phone]
Email: [email protected]

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www.edt.co.uk