General DPH230SD User manual

DPH230SD

USER’S MANUAL

pH METER WITH DATALOGGING D CARD

Please read this manual carefully and thoroughly before using this product.

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 –4

Operating Instructions . . . . . . . . . . . . . . . . . . . . . 4 – 12

What’s in the Case . . . . . . . . . . . . . . . . . . . . 4 –5

etup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 –7

Calibrating the pH Electrode . . . . . . . . . . . . . 7 –8

Normal Operation . . . . . . . . . . . . . . . . . . . . . 8 –9

Holding and toring Measurements. . . . . . . . . . 9

Automatic vs. Manual Datalogging . . . . . . . . . 10

Transferring Data from an

D Card to a Computer . . . . . . . . . . . . . . . 11 – 12

pecifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Maintenance & Troubleshooting Tips . . . . . . . . . . . . 14

Optional Accessories. . . . . . . . . . . . . . . . . . . . . . . . . 14

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . 15

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . 15

INTRODUCTION

Thank you for purchasing General Tools & nstruments’ DPH230SD pH Meter with

Datalogging SD Card. Please read this user’s manual carefully and thoroughly before using

the instrument.

The DPH230SD is a general-purpose handheld instrument suitable for measuring the

pH and oxidation-reduction potential (ORP) of a solution. Using optional probes with a BNC

connector, the meter can measure pH from 0 to 14 and ORP from -1999 mV to +1999 mV.

The meter also accepts an optional automatic temperature compensation (ATC) probe that

configures the pH electrode to measure solutions whose temperature is between 32º and

150ºF (0º and 65ºC). For measuring the pH of solutions at temperatures between 32º and

212ºF (0º and 100ºC), the temperature compensation can be set manually. pH electrodes

must be calibrated for pH 4, pH 7 and pH 10 using buffer solutions.

Among the applications and environments suitable for the DPH230SD are water

conditioning, wastewater monitoring, beverage production, aquaculture (fish farming),

aquariums, pulp and paper processing, electroplating, and photography.

The DPH230SD has the performance and features needed to satisfy the most demanding

aspects of the above applications. A front-panel pushbutton enables rapid switching

between the two measurement modes. Measurement accuracies are ± (0.02 pH units

+ 2 digits) for pH readings and ± (0.5% of the reading + 2 digits) for ORP readings.

Because it is microprocessor-based, the DPH230SD can make full use of the portability,

reliability and large storage capacities that SD memory cards offer. Measurements can be

made automatically at any sampling rate between one second and nine hours. After time-

stamping and storing the measurements on an SD card plugged into the instrument (a

process called datalogging), the user can remove the card and plug it into a laptop or

desktop computer either directly or via a USB card reader. The data logs are stored on the

card as files with the .xls extension, which can be opened by Microsoft’s Excel application.

The DPH230SD has a backlit 2-1/2 in. diagonal display and is powered by six “AA” Alkaline

batteries or an optional 9-VDC AC adapter.

KEY FEATURE

• Measures pH and ORP using optional electrodes

• Measured parameter can be changed by pressing front-panel button

• Optional ATC temperature probe automatically calibrates pH electrode to pH 4,

pH and pH 10

• Displays maximum and minimum readings

• Performs real-time automatic datalogging at sampling time settable from 1 second

to 9 hours

• Also supports manual logging and changing of card storage location

• Outputs Excel-compatible data logs

• Accepts SD memory cards of up to 16 GB capacity

• Big (2.5 in. diagonal) front-panel green backlit LCD is easy to read

• Auto power off function

• Powered by six “AA” batteries or optional 9V AC/DC adapter

OPERATING IN TRUCTION

WHAT’S IN THE CASE

The DPH230SD comes fully assembled in a carrying case along with a 2 GB SD memory

card and this user’s manual.

Optional accessories available from General Tools & nstruments include pH electrodes, a

probe that enables automatic temperature compensation (ATC) of pH electrodes, an ORP

electrode, pH 4 and pH 7 buffer solutions, and a 9VDC adapter for a 110V power supply.

See the Optional Accessories section of this manual for more details.

Figure 1 shows all of the controls and indicators on the front, back, top, bottom and right

side of the DPH230SD. Familiarize yourself with the positions and functions of these

controls, indicators and connectors before moving on to the setup procedure.

TOP

RIGHT

SIDE

BACK

BOTTOM

FRONT

Fig. 1. The DPH230 D’s controls and indicators and other physical features

SETUP

1. Choose the power source. Before using the DPH230SD, be sure it is powered by fresh

batteries or an optional 9VDC AC adapter plugged into the bottom jack on its right side

(callout 1-15).

To remove the battery compartment cover, remove the two screws holding it in place

(callout 1-11). Then install six “AA” batteries in the correct orientation, using the polarity

marks on the inside of the compartment as a guide. Replace the cover by replacing the two

screws.

2. Install an D card. To prepare for setup, also install the supplied 2 GB SD memory card

or another card with a capacity from 1 GB to 16 GB in the socket on the bottom of the

DPH230SD (callout 1-18). When installing the card, make sure its gold contacts are

facing front and push the card into the socket until you hear a click. To remove the card,

push it in until you hear a click and the card pops out.

Now power on the instrument by pressing the POWER button (callout 1-2) to generate a

short beep. (To power off the DPH230SD, press the POWER button and hold it until the

instrument responds with a long beep.)

When the meter powers on, a series of transient startup screens will briefly appear. Once

the display has stabilized, perform the following eight setup steps in the order presented.

3. Format the D card. LOGGER SET button (callout 1-8) and hold it for at least five

seconds, until “Sd-F” appears in the lower half of the display. Quickly (within three

seconds) press the REC/ENTER button.

( f you press buttons too slowly in setup mode, the screen will revert to the normal display.

To return to the setup sequence, press and hold the LOGGER SET button again. To move

ahead to the next field in the sequence or to the next parameter, press the HOLD/ESC

button.)

Pressing the REC/ENTER button causes the word “no” or “yES” to appear over the term

“Sd-F”. Press the ▼button to make a selection. Choose “yES” whenever a new SD card is

being used, or when a used card is being repurposed (from use with another SD card

instrument or a camera, for example) and all data on it is to be erased. Choose “no” to

preserve any data on a card previously used with this instrument.

1-1 Liquid-crystal display

1-2 POWER button

1-3 HOLD/ESC button

1-4 REC/ENTER button

1-5 ▲button

1-6 ▼button

1-7 T ME button

1-8 LOGGER SET button

1-9 Kickstand

1-10 Battery compartment cover

1-11 Battery compartment cover screws

1-12 Tripod attachment nut

1-13 Socket for ATC temperature probe

1-14 Socket for pH electrode

1-15 Socket for 9VDC AC adapter

1-16 Reset button

1-17 RS232 output jack

1-18 SD card socket

f you choose “yES”, after you press the REC/ENTER button the instrument will prompt you

to confirm that decision by displaying the term “Ent” below “yES” and sounding three

beeps. To confirm that you want to begin the erasure/formatting procedure, press the

REC/ENTER button. “Ent” will then flash several times and the instrument will sound

another three beeps to confirm that the SD card has been erased and formatted.

4. et the date and time. Once the SD card has been formatted (or not), the meter will

automatically move to the next step in the startup sequence: setting the current date and

time. When the word “dAtE” appears in the center of the display, along with the flashing

value “00.00.00” at the lower left, above “yy.mm.dd”, set the current year by pressing

the ▼or ▲button repeatedly until the correct value appears above “yy”. Press the

REC/ENTER button to store the setting. The next screen that appears will have the value

above “mm” flashing. Use the ▼or ▲button to navigate to the current month and press

the REC/ENTER button to store the setting. When the next screen flashes the value above

“dd”, again use the ▼or ▲button to navigate to the current day and press the

REC/ENTER button to store the setting.

Once you have set the date, the display will prompt you to set the hour, minute and second

of the current time. Again use the  or  buttons to navigate to the correct values, and the

REC/ENTER button to store the settings.

5. et the datalogging sampling time. Once the date and time have been set and stored,

the display will show a value below the letters “SP-t”. Press the ▼or ▲button to

decrease or increase the flashing hour value until the desired number appears below

“SP-t”. Press the REC/ENTER button to store that setting. The minutes value will then

flash. Press the ▼or ▲button to decrease or increase the value and then press the

REC/ENTER button to store that setting. Finally, press the ▼or ▲button to decrease or

increase the flashing seconds value and then press the REC/ENTER button to store

that setting.

6. Enable or disable auto power off. Once the sampling time has been set and stored,

the display will show the word “yES’ over the term “PoFF”. Press the ▼button until the

desired automatic power off management scheme (“yES” for enable; “no” for disable)

is displayed. Press the REC/ENTER button to store the selection. f enabled, the power off

function shuts off the DPH230SD after a period of inactivity of ten minutes.

7. Enable or disable the beeper. Once the auto power off function has been enabled

or disabled, the display will show the word “yES” over the word “bEEP”. Press the

▼button until the desired setting (“yES” or “no”) is displayed, and then press the

REC/ENTER button to store the selection.

8. Choose a decimal point or comma to represent the decimal division between integers

and fractions (for example, American-style 20.88 vs. European-style 20,88). Once the

beeper has been enabled or disabled, the display will show the word “bAS C” above the

phrase “dEC”. Press the ▼button to make “bAS C” (American style) or “Euro” appear in

the upper display, as desired. Press the REC/ENTER button to store the selection.

9. elect the temperature unit. Once the format of decimal point divisions has been set

and stored, the lower portion of the display will show the term “t-CF”. Press either the

▼or ▲button to change the letter displayed at the right of the display to “C” (for

Celsius units) or “F” (for Fahrenheit units), as desired. Then press the REC/ENTER

button to store the selection.

10. et the compensation temperature for pH electrode measurements when operating

without an ATC temperature probe. The default value is 77ºF (25ºC). The value is

adjustable between 32º and 212ºF (0º and 100ºC).

Once the display temperature unit has been set and stored, the lower portion of the display

will show the term “t-SEt”. Press either the ▼or ▲button until the value above “t-SEt”

matches the desired compensation temperature, in ºC or ºF. Press the REC/ENTER button to

store the setting.

The display will then either return to the first of the eight steps in the setup sequence—

choosing whether or not to format the SD memory card—or show the term “ESC”. f “ESC”

appears, press either the HOLD/ESC button or the LOGGER SET button to exit the setup

procedure and enter normal operating mode.

CALIBRATING THE pH ELECTRODE

The optional pH electrode you are using must be calibrated before

making pH measure ments with it for the first time. The electrode

also should be calibrated whenever you wish to maximize the

accuracy of measurements. Calibration is necessary because not

every pH electrode is an “ideal” electrode that generates 0 mV at

pH 7 and 177.4 mV at pH 4.

1. To calibrate the pH electrode, perform the following procedure

while referring to Figure 2.

2. Calibrating a pH electrode using the buffer solution

2-1 Electrode plug

2-2 Electrode handle

2-3 Electrode head

2-4 pH buffer solution

1. Insert the plug of the pH electrode into the BNC socket

at the top of the meter (callout 1-14 of Fig. 1).

2. Power on the meter by pressing the POWER button.

3. Using the procedure detailed earlier, manually adjust the compensation

temperature so it matches the temperature of the buffer solution. Alternatively,

use an ATC temperature probe to make the adjustment automatically.

4. Holding it by its handle, immerse the pH electrode in the bottle of buffer solution.

( f you are using the ATC temperature probe, immerse its head in the bottle as well.)

5. Gently shake the electrode (and the probe, if used). The display will show the

pH value.

Fig. 2

6. Use two fingers to press the REC/ENTER and HOLD/E C buttons at the

same time. When this screen appears, release the buttons.

7. Press the ▼or ▲button until this screen appears. Press the REC/ENTER

button to calibrate the electrode for pH 7.

8. Press the ▼or ▲button again until this screen appears. Press the

REC/ENTER button to calibrate the electrode for pH 4.

9. Press the ▼or ▲button again until this screen appears. Press the

REC/ENTER button to calibrate the electrode for pH 10.

10. The pH electrode has now been calibrated once. To maximize measurement

accuracy, General recommends rinsing the head of the electrode (and the head of

the ATC temperature probe, if used) in distilled water and then repeating the above

steps at least twice more.

11. To recalibrate the electrode in the future, you must clear the existing

settings. To do so, press the ▼or ▲button until this screen appears. Then

press the REC/ENTER button to clear the saved settings before repeating

the steps above to calibrate the electrode for pH 7, pH 4 and pH 10.

NORMAL OPERATION

The DPH230SD can measure either the pH or the oxidation-reduction potential (ORP)

of a solution.

1. To select the type of measurement, press the ▼button (which has the word

“Function” stenciled above it) until the display shows either the term “pH” or “mV”

(the unit of ORP measurements).

Following are the default states for the DPH230SD:

• pH measurement

• Temperature unit of ºC

• Manual temperature compensation

• Auto power off

• Sampling time of 2 seconds

To change any of these parameters, use the specific procedure for it detailed in the Setup

section.

2. To measure the pH of a solution, press the ▼button until the display shows the term

“pH”. Make sure the pH electrode is seated firmly in the BNC socket (callout 1-14 of

Fig. 1) on the top of the meter. f the ATC temperature probe is being used, make sure it

is seated firmly in its socket (callout 1-13 of Fig. 1) on the top of the meter as well. f the

ATC probe is not being used, perform the last step of procedure to manually match the

compensation temperature to the temperature of the solution being tested.

Holding the pH electrode by its handle, immerse it in the solution under test. ( f you are

using the ATC temperature probe, immerse its head in the solution as well.) Gently shake

the electrode (and probe, if used) to help any air bubbles escape and to ensure an accurate

reading.

The display will simultaneously show the solution’s pH in the center and either the

manually selected compensation temperature or the actual temperature of the solution

(as measured by the ATC probe) below it. By default, the temperature reading will be in ºC,

unless ºF has been selected.

3. To measure the ORP of a solution, press the ▼button until the display shows the term

“mV”. Plug an optional ORP electrode with a BNC connector into the same socket on the

top of the meter (callout 1-14 of Fig. 1) that accepts the plug of a pH electrode.

Holding the ORP electrode by its handle, immerse it in the solution under test. Gently shake

the head of the electrode to help any air bubbles escape and to ensure an accurate

reading. The display will show the ORP of the solution, in mV.

Whenever the DPH230SD is in measurement mode, you can turn off the backlight (which is

on by default) by briefly pressing (but not holding) the POWER/ESC button. To reactivate the

backlight, briefly press the button again.

Whenever the instrument is in measurement mode, you also can check the current date

and time by briefly pressing the T ME button. Doing so causes both values to appear briefly

at the lower left of the display.

HOLDING AND STORING MEASUREMENTS

1. To hold a measured value of pH or ORP, press the HOLD/ESC button during the

measurement. Doing so will cause the word “HOLD” to appear at the top of the display.

Pressing the HOLD/ESC button again releases the hold.

2. To record and recall readings, press the REC/ENTER button while making

measurements. This will make the term “REC” appear at the top of the display. Pressing

the REC/ENTER button again, briefly, will make the term “MAX” appear to the right of

“REC” and switch the display to the maximum value stored in memory during the last

recording session. Pressing the REC/ENTER button again, briefly, will make the term

“M N” appear to the right of “REC” and switch the display to the minimum value stored

during the last session.

3. To exit recording mode, press and hold the REC/ENTER button for at least three

seconds, until the term “REC” disappears from the top line of the display. The display

will then revert to showing the current reading.

AUTOMATIC VS. MANUAL DATALOGGING

The DPH230SD can automatically log data at a user-selected sampling period from

1 second to 9 hours. To view the sampling time for which the instrument was set up, press

the LOGGER SET button (which has the words “Sampling check” stenciled below it) once.

To change the sampling time, perform Step 5 of the setup procedure.

1. To start automatic datalogging, press the REC/ENTER button once. The top line of the

display will show the term “REC”. Pressing the LOGGER SET button at this point will

make REC flash and add the flashing term “LOGGER” at the top right of the display.

This indicates that the instrument is currently storing measured values and their time

stamps in memory.

2. To pause automatic datalogging, press the LOGGER SET button once; this action

makes the flashing term LOGGER disappear from the top right of the display and changes

the term “REC” from flashing to constant. Pressing the LOGGER SET button again

resumes automatic datalogging.

3. To end automatic datalogging, press the REC/ENTER button and hold it for at least two

seconds. This action causes the “REC” message to disappear.

4. To log data manually, set the sampling time to zero using Step 5 of the setup

procedure. Then press the REC/ENTER button once. The display will show the term “REC”

on the top line, a value in the middle, and below it the letter “P” on the left and

a number from 1 to 99 on the same line to the right. The number indicates the position

on the SD card that will be used to store manually logged data.

Now press the LOGGER SET button. This will cause the beeper to sound and the term

“LOGGER” to briefly appear at the upper right of the display. As in automatic datalogging

mode, in this mode the instrument is storing measurements and their time stamps on the

SD card.

n manual datalogging mode, however, measurements are being stored continuously

(with a sampling time of zero), and their locations on the card can be changed.

5. To change the storage location of manually logged data, press the ▼button once;

this causes the “P” to disappear from the left side of the display and the value on its line

to begin flashing. Once the flashing begins, you can use the ▼and ▲buttons to change

the flashing value to any number between 1 and 99. Once you have chosen the storage

location, press the REC/ENTER button to save the setting. This causes the value to stop

flashing and the “P” to return.

6. To end manual datalogging, press the REC/ENTER button and hold it for at least three

seconds. This action causes the “REC” message to disappear from the top line of the

display.

Table of contents

Other General Measuring Instrument manuals

Popular Measuring Instrument manuals by other brands

Suaoki

Suaoki D40 user manual

Elster

Elster BK-G1.6 operating instructions

Endress+Hauser

Endress+Hauser Deltabar FMD71 technical information

Duratool

Duratool D03128 manual

Vega

Vega VEGAPULS 65 Quick setup guide

Tonghui

Tonghui TH2618B Operation manual

Tenmars

Tenmars TM-801 user manual

MSR

MSR 145 user manual

TPS

TPS WP-82 manual

ELMETRON

ELMETRON CP-511 user manual

PCB Piezotronics

PCB Piezotronics 003C30 Installation and operating manual

Tenma

Tenma 72-10465 manual

Endress+Hauser

Endress+Hauser Proline Promag 50 Brief operating instructions

Siemens

Siemens SITRANS F Coriolis FCT030 Function manual

KLINGER

KLINGER CMF V Series instruction manual

EXFO

EXFO FTB-2 Notice

Keysight

Keysight M8290A Getting started guide

ADTEK

ADTEK MW-5 operating manual