JENCO VisionPlus pH618N User manual

Operation Manual

MODEL pH 618N

Microcomputer Based

pH & Temperature

Pocket

Meter

pH618N

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

VISIONPLUS pH 618N OVERVIEW............................ 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 VISIONPLUS pH 618N.................................... 5

A. Power ON/OFF .................................................... 5

B. Set Date and Time................................................ 5

C. Select Buffer........................................................ 6

D. Calibrate pH......................................................... 6

E. Measure .............................................................. 7

F. Hold Data

........... ................................................. 7

G. Save Data

.................................................…........ 7

H. Recall Data and Erase Data...................................... 7

ONGOING MAINTENANCE......................................... 8

A. Replace Electrode................................................. 8

ERROR DISPLAYS AND TROUBLESHOOTING ....... 9

SPECIFICATIONS ........................................................ 10

WARRANTY ................................................................. 10

INITIAL INSPECTION AND ASSEMBLY

Carefully unpack the instrument and accessories. Inspect for

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

Jenco representative immediately. All packing materials should

be saved until satisfactory operation is confirmed.

BEFORE YOUR FIRST USE

A. Replace the Batteries

Replace the battery when the blinking

low battery indicator “BAT ” appears on

the middle left hand side of the LCD

screen. The instrument can operate

within specifications for

approximately2~3 hours after low battery

indicator appears.

1. Shown in the right figure.

2. Take off the battery cover.

3. 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 VisionPlus pH

meter.

2. Soak the electrode in a 3M KCL solution for 2 hours

before first use or after storage.

C. Setup and Calibrate the Electrode and Meter

VisionPlus pH 618N must be setup and calibrated before your

first use. Please follow the instructions detailed in section

USING VISIONPLUS pH 618N.

VISIONPLUS pH 618N 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. VisionPlus Graphical Display

1. DATE (MM-DD-YY)

2. HOLD mode indicator

3. MEASURE mode indicator

4. CALIBRATION buffer(s)

5. TIME (HH:MM – 24H format)

6. pH reading

7. TEMPERATURE reading

8. NUMBER of calibration point

Note: ℃ or °F is factory pre-set.

OPERATION MODES AND KEYPAD OPERATIONS

A. Operation Modes

VisionPlus pH meter has 6 operation modes:

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

and temperature measurements.

2. Calibration Mode. Calibration Mode is used to perform

1, 2 or 3 point calibration.

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

values for increased ease of use.

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

measured data which have been stored in memory.

5. Date and Time Set Mode. Date and Time Set Mode is used

to change date and time.

6. 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).

B. Keypad Operations

Key Operation

Mode

Duration Function

All, except

Hold 2 seconds

or more

Turns meter on/off.

Measure

0 second

Holds current

measurement

reading. Press

again to resume

measuring.

Hold 0 second Returns to Measure

Mode.

HOLD

Date and

Time Set

0 second Moves cursor to next

set of data.

Measure 2 seconds Enters Calibration

Mode.

Measure 10

seconds

or more

Enters Date and

Time Set Mode.

Calibration 0 seconds Leaves Calibration

Mode.

CAL

Date and

Time Set 2 seconds

or more Leaves Date and

Time Set Mode.

Key Operation

Mode

Duration Function

CAL Recall Data 2 seconds Erases ALL stored

data and return to

Measure Mode.

Measure 2 seconds Stores current pH

reading, date and

time into memory.

Date and

Time Set

0 second Increases current

number.

Recall Data 2 seconds

or more Leaves Recall Data

Mode.

STORE

Buffer Select 2 seconds

or more Leaves Buffer

Select Mode.

Measure 2 seconds Enters Recall Data

Mode.

Measure 5 seconds

or more Enters Buffer

Select Mode.

Recall Data 0 second Scrolls through

stored data.

Date and

Time Set

0 second Decreases current

number.

SCROLL

Buffer

Select

0 second Selects new buffer

set.

USING VISIONPLUS pH 618N

A. Power ON/OFF

Press “HOLD” key for 2 seconds or more. The unit will turn on

and enter the “Measure Mode”. Repeat the process to turn off

the unit. The unit will also automatically turn off after 10 minutes

of no key activity.

B. Set Date and Time

1. Press “CAL” key for 10

seconds or more to enter

“Date and Time Set Mode”.

2. Press “HOLD” key to select

calendar or time parameters.

3. Press “STORE” and

“SCROLL” keys to increase and decrease values respectively.

4. Press “CAL” key for 2 seconds to exit and return to

“Measure Mode”.

C. Select Buffer

1. Press “SCROLL” key for 5

seconds or more to enter

“Buffer Select Mode”.

2. Press “SCROLL” key again

to select either 7.00

(7.00/4.01/10.01) or 6.86

(6.86/4.00/9.18) buffer sets.

3. Press “STORE” key for 2 seconds to exit and return to

“Measure Mode”.

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

unless one decides to change the buffer settings.

D. Calibrate pH

1. Press “CAL” key for 2 to 3

seconds to enter

“Calibration” mode.

2. Clean and dip meter into

either pH 7.00 or 6.86

buffer solution. A ‘WAIT”

icon will flash.

3. VisionPlus pH meter will perform end point sensing to

determine when the calibration reading is stable. Meter is

calibrated when “WAIT” icon disappears, and the unit will

automatically enter the next point calibration 5 seconds

later. One point/first point calibration is now completed.

Press “CAL” key to exit or continue to next step for 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. Continue to next step for three points/third point

calibration or press “CAL” to exit two points calibration

mode.

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

calibration.

7. When “WAIT” icon disappears, 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.

E. Measure

Dip the meter into the test solution in the “Measure Mode”.

F. Hold Data

1. When the pH readings is

stable, press “HOLD” key

once to lock the reading.

2. Press “HOLD” key again

to unlock reading and the

unit will return to “Measure

Mode”. The unit is now

ready for another

measurement.

Note: The unit cannot be power off in “Hold Mode”.

G. Save Data

Either in the “Hold Mode” or the

“Measure Mode”, press “STORE”

key for 2-3 seconds. The “DATA

SAVE” and “M-XX” icons will

appear indicating the reading has

been saved and stored in

memory location XX. The unit

will automatically returns to

“Measure Mode” and ready to

perform other task.

Note: The Model pH 618N is equipped with a non-volatile

memory that can store up to 50 different sets of readings (pH,

temperature, Time and date). Non-volatile memory will be

retained even if power is lost. When all 50 memory locations

are used up, the next set of data saved will overwrite the data

stored in the first location and so on.

H. Recall and Erase Data

1. In “Measure Mode”, press “SCROLL” key 2-3 seconds,

the last set of saved data will appear.

2. By pressing the “SCROLL” key, previous saved data will

appear.

3. Press “STORE” key for 2 seconds to exit and return to

“Measure Mode”.

4. Press “CAL” key for 2-3

seconds to erase ALL

stored data and return to

“Measure Mode.”

ONGOING MAINTENANCE

A. Replace Electrode

1. Unscrew the electrode collar to

remove the electrode & ATC

assembly as shown in the right

figure.

2. Remove the old electrode from

the electrode collar.

3. Insert a new electrode, make sure the electrode fit back

into the meter correctly.

4. Screw back the electrode collar.

5. Soak the electrode in a 3M KCL solution for 2 hours and

recalibrate the pH 618N following the instructions detailed

in section USING VISIONPLUS pH 618N.

ERROR DISPLAYS AND TROUBLESHOOTING

pH LCD

Display ATC

Disp DISPLAY

Mode Possible cause(s)

[Action(s)]

Any

Value

"OVER"

Measure

a. Temperature over 0 to

99.9°C range.

[Bring solution to a

lower/higher

temperature.]

[Replace temperature

probe.]

b. No temperature sensor.

[Use a temperature

probe.]

"OVER"

0.0~

99.9°C

Measure

pH value over 0.00

to14.00pH range .

[Over Range or

Recalibrate.]

"OVER"

0.0 ~

60.0°C

pH CAL

a.pH-

STAND

b.pH-

SLOPE

a. Offset @ 7.00pH:

mV>90mV

[email protected]:

mV>98.3mV

b. New slope>ideal

slope by 30%

[Use a new buffer

solution.]

[Replace electrode.]

"OVER"

0.0 ~

60.0°C

pH CAL

a.pH-

STAND

b.pH-

SLOPE

a. Offset @ 7.00pH:

mV<-90mV

Offset @ 6.86pH:

mV< -81.7 mV

b. New Slope<ideal

slope by 30%

[Use a new buffer

solution.]

[Replace electrode.]

Any

Value

"OVER"

pH CAL

a.pH-

STAND

b.pH-

SLOPE

Buffer temperature over

0 to 60 °C range.

[Bring buffer temperature

within 0 to 60°C range .]

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