PCE Instruments PCE-PH 25 User manual

Operation Manual

PCE-PH 25

Microcomputer Based

pH/Condctivity/TDS/

Sanility & Temperature Pocket

Meter

CONTENTS

INITIAL INSPECTION AND ASSEMBLY........................2

BEFORE YOUR FIRST USE ........................…...................2

A. Replace the Batteries ....................................................2

B. Soak the Electrode.... ....................................................2

C. Setup and Calibrate the Electrode and Meter…..........2

OVERVIEW PCE-PH 25 …………....................................3

A. Meter Description...........................................................3

B. VisionPlus Graphical Display.......................................3

OPERATION MODES AND KEYPAD OPERATIONS 4

A. Operation Modes............................................................4

B. Keypad Operations.......................................................4

USING PCE-PH 25……………............................................6

A. Power ON/OFF .............................................................. 6

B. Temperature Unit Select Mode................................... 6

C. pH Calibration............................................................... 7

D. Conductivity Calibration.............................................. 8

E. Measure ..........................................................................10

F. Hold Data ........... ......................................................... 10

G. Save Data ...........................................................…...... 10

H. Recall Data ...................................................................11

I. Erase Data......................................................................11

ONGOING MAINTENANCE...............................................12

A. Replace Electrode........................................................12

ERROR DISPLAYS AND TROUBLESHOOTING.......12

SPECIFICATIONS ................................................................13

WARRANTY ...........................................................................16

INITIAL INSPECTION AND ASSEMBLY

Carefully unpack the instrument and accessories. Inspect for

damages made in shipment. If any damage is found, notify th

producer immediately. All packing materials should be saved until

satisfactory operation is confirmed.

BEFORE YOUR FIRST USE

A. Replace the Batteries

1. Take off the battery cover

as shown in the right figure.

2. Remove all of the old

batteries and insert a new

set of batteries ensuring

the polarities are correct.

B. Soak the Electrode

1. Remove the electrode cap

covering the PCE-PH 25 meter.

2. Soak the electrode in a pH 4 solution for 10 minutes

before first use or after storage.

C. Setup and Calibrate the Electrode and Meter

PCE-PH 25 must be setup and calibrated before your first use.

Please follow the instructions detailed in section

USING pH-Meter PCE-PH 25.

PCE-PH25 OVERVIEW

A. Meter Description

1. Battery cap

2. LCD screen

3. Keypad

4. Electrode collar

5. Electrode & ATC assembly

(Electrode cap is not shown.)

B. Graphical Display

1. pH BUFFER mode indicator

2. HOLD mode indicator

3. DATA NUMBER indicator

4. CALIBRATION buffer(s)

5. BATTERY indicator

6. pH / CONDUCTIVITY / TDS / SANILITY reading

7. TEMPERATURE reading

8. RECALL DATA mode indicator

BUF:7/4/10

10.00

125.2

7.00

HOLD

Fã¡

REC

HoId Store

ModeScroII

OPERATION MODES AND KEYPAD OPERATIONS

A. Operation Modes

The pH-meter has 6 operation modes:

1. Measure Mode. Measure Mode is used to make pH /

conductivity / TDS / salinity and temperature measurements.

2. Calibration Mode. Calibration Mode is used to perform

1, 2 or 3 point pH calibration and conductivity calibration.

3. Hold Mode. Hold Mode is used to display held measured

values for increased ease of use.

4. Temperature display set mode. This Mode is used to

select °C or °F.

5. pH Buffer Select Mode. Buffer Select Mode is used to select

the buffer set, which can either be 7.00(7.00/4.01/10.01) or

6.86(6.86/4.00/9.18).

6. Recall Data Mode. Recall Data mode is used to display

measured data which have been stored in the memory.

B. Keypad Operations

Key

Operation

Mode

Duration

Function

Hold

All, except

Hold

1 second

Turns meter on/off.

Conductivity

Calibration

0 second

Saves the

Calibration reading.

Recall Data

0 second

Returns to Measure

Mode.

Measure

0 second

Holds current

measurement

reading. Press

again to resume

measuring.

Hold

0 second

Returns to Measure

Mode.

Key

Operation

Mode

Duration

Function

Mode

Measure

0 second

Selects display

mode. Pressing

this key changes

the display

sequentially to

display pH/Temp,

Conductivity/Temp,

TDS/Temp and

Salinity/Temp

modes.

pH Measure

2 seconds

Enters pH

Calibration mode.

Conductivity

Measure

2 seconds

Enters Conductivity

Calibration mode.

TDS

Measure

10 seconds

Selects

Temperature °C or

°F mode.

Recall Data

0 second

Selects whether

or not to erase all

stored data.

Store

Measure

2 seconds

Stores current

pH/Temp,

Conductivity/Temp,

TDS/Temp and

Salinity/Temp

reading into

memory.

Temperature

display mode

Selects

0 second

Selects

Temperature °C

pH Buffer

Select

0 second

Selects 7.00 Buffer

Sets and Leaves

Buffer Select Mode.

Recall Data

0 second

Decreases current

number.

Key

Operation

Mode

Duration

Function

Scroll

Measure

2 seconds

Enters Recall Data

Mode.

Temperature

display mode

Selects

0 second

Selects

Temperature °F

pH Measure

5 seconds

Enters pH Buffer

Select Mode.

pH Buffer

Select

0 second

Selects 6.86 Buffer

Sets and Leaves

Buffer Select Mode.

Recall Data

0 second

Increases current

number.

USING PCE-PH 25

A. Power ON/OFF

1. Press and hold “Hold” key for 1 second. The unit will turn

on and enter the “Measure Mode”. Repeat the process to

turn off the unit.

2. The unit will also automatically turn off after 10 minutes of

no key activity.

B. Temperature Unit Select Mode

1. The PCE-PH 25 meter is factory pre-set in “°C”.

2. To change to “°F”, press “Mode” key to enter the “TDS

Measure Mode”.

3. Press and hold the “Mode” key for 10 seconds, the unit will

enter the “Temperature Unit Select Mode”.

4. Press “Store” key to select “°C” and press “Scroll”key to

select “°F”.

TEMPERATURE UNIT

SELECT

MODE: EXIT

SCROLL: ¡ãF

STORE: ¡ãC

C. pH Calibration

a. pH Buffer sets Select

1. In the “pH Measure Mode”, press and hold the “Scroll” key

for 5 seconds to enter the “pH Buffer sets Select Mode”.

2. Press “Store”key to select 7.00 (7.00/4.01/10.01) or press

“Scroll”key to select 6.86 (6.86/4.00/9.18) .

3. Press “Mode”key to exit and return to “pH Measure Mode”.

SELECT pH BUFFER

MODE: EXIT

SCROLL: 6.86

STORE: 7.00

Note: There is no need to repeat this procedure every time

unless one decides to change the buffer settings.

b. pH Calibration

1. Press “Mode” key to enter the “pH Measure Mode”.

2. Clean and dip meter into either pH 7.00 or 6.86 buffer

solution. Press “Mode”key and hold for 2 seconds to enter

the “pH Calibration Mode”. A ‘WAIT” icon will flash. The

pH/EC80 meter will perform end point sensing to determine

when the calibration reading is stable.

BUF:7

7.00

25.2

7.00

WAIT

¡ãC

3. When the “WAIT” icon disappears, one point/first point

calibration is now complete. Press “Mode” key to exit or to

wait 5 seconds for the meter to enter two points / second

point calibration.

4. Repeat Steps 2 and 3 for two points/second point

calibration by dipping the meter in pH 4.01/4.00 or

10.01/9.18 buffers.

5. Repeat Steps 2 and 3 for three points / third point

calibration.

6. When “WAIT” icon disappears. Three points / third point

calibration is now complete. The unit will automatically

return to Measure Mode.

Note: For accurate measurements, it is recommended that

pH calibration is preformed once a week and after replacing

the electrode.

D. Conductivity Calibrate

a. Preparing Standard Solutions

Suitable conductivity standards are available commercially or

the user can prepare them using research grade reagents.

Here are some standard solutions the user can prepare to

calibrate the probe of the model PCE-PH 25.

1. Standard solution of 1413uS at 25°C: Accurately weight out

0.746 grams of research grade dried Potassium Chloride

(KCL). Dissolve in 1000ml of distilled water.

2. Standard solution of 12.90mS at 25°C: Accurately weight

out 7.4365 grams of research grade dried Potassium

Chloride (KCL). Dissolve in 1000ml of distilled water.

[Note: You can store the remaining solution in a plastic

container for one week but the air space between the cap

and the solution must be kept to an absolute minimum.

Storing the excess solution below 4°C can increase the

storage life. If you have any doubt of the accuracy of the

stored solution, a fresh batch should be prepared.]

b. Conductivity Calibration

1. Press “Mode” key to enter the “Conductivity Measure

Mode”.

2. Clean and dip meter into Standard Solution. Allow

temperature reading to stabilize. Press and hold “Mode”key

for 2 seconds to enter the “Conductivity Calibration Mode”.

The “CAL” icon appears on the LCD.

3. Press “Store”, “Scroll” and “Hold” keys to sequentially view

previous calibration settings.

TEMP.COE.: 1.91%

147 uS/cm

TDS FACTOR: 0.65

TEMP.REF.: 25¡ãc

CAL 25.2¡ãc

TDS FACTOR:

The default factor value is 0.65. To change the TDS factor,

use the “Store” and “Scroll” keys to adjust the value

between 0.30 and 1.00. Press “Hold” key to save the new

value and the unit will automatically go into the next

calibration parameter. If “Mode” key is pressed instead of

the “Hold” key, any changes made will be cancelled and

the previous calibration settings will be retained.

TEMP. COE.:

The unit uses the temperature coefficient to calculate

temperature compensated conductivity. The default value

is 1.91%. To change the temperature coefficient, use the

“Store” and “Scroll” keys to adjust the value between 0

and 4.00%. Press “Hold” key to save the new value and

the unit will automatically go into the next calibration

parameter. If “Mode” key is pressed instead of the “Hold”

key, any changes made will be cancelled and the previous

calibration settings will be retained.

TEMP. REF.:

The unit uses the temperature reference value to calculate

temperature compensated conductivity. The default value

is 25°C. To change the temperature coefficient, use the

“Store” and “Scroll” keys to adjust the value between 15°C

and 25°C. Press “Hold” key to save the new value and the

unit will automatically go into the next calibration parameter.

If “Mode” key is pressed instead of the “Hold” key, any

changes made will be cancelled and the previous

calibration settings will be retained.

4. Immerse the probe in a standard of known conductivity,

preferably a standard in the middle range of the solutions to

be measured. Immerse the probe (at least 2” to 3” or

5~7cm from the tip) into standard solution without touching

the sides of the calibration container. Shake the probe

lightly to remove any air bubbles trapped in the conductivity

cell.

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