JENCO VisionPlus pH618N User manual

pH618
Operation Manual
MODEL pH 618
Microcomputer Based
pH&Temperature
Pocket Meter

1
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 618 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 618...................................... 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 .................................................................... 7
ONGOING MAINTENANCE........................................ 8
A. Replace Electrode......................................................... 8
B. Replace Calendar Battery ............................................ 8
ERROR DISPLAYS AND TROUBLESHOOTING ...... 9
SPECIFICATIONS .................................................... 10
WARRANTY ............................................................. 10

2
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
1. Remove the screws as shown in the
right figure and gently take off the
cover. A small screwdriver is
provided to easily remove the
screws.
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 VisionPlus pH
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
VisionPlus pH 618 must be setup and calibrated before your
first use. Please follow the instructions detailed in section
USING VISIONPLUS pH 618.

3
VISIONPLUS pH 618 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
1
2
3
4
5

4
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 Move 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.

5
Key Operation
Mode Duration Function
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 618
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”.

6
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.

7
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 618 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 Data
1. In “Measure Mode”, press
“SCROLL” key 2-3
seconds, the last set of
saved data will appear.

8
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”.
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.
B. Replace Calendar Battery
1. Unscrew the electrode & ATC
assembly as shown in the right
figure.
2. Remove the two screws at the
lower part of the unit before
detaching the upper part of the
unit from the case as shown in
the right figure.
3. Remove the old battery and
insert a new battery ensuring
that the polarity is correct.
Note: In normal usage, the battery should last for more than 5
years.

9
ERROR DISPLAYS AND TROUBLESHOOTING
pH LCD
Display
ATC
Display
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 .]

10
SPECIFICATIONS
pH
Range Resolution Accuracy
0.00 to 14.00 pH 0.01 pH ±0.02 pH ± 1 LSD
Temperature
Range Resolution Accuracy
0.0 to 99.9 °C 0.1 °C ±0.3 °C
32.0 to 211.8 °F 0.2 °F ±0.6 °F
pH
pH buffer recognition pH 7.00, 4.01, 10.01 or
pH 6.86, 4.00, 9.18
pH Temperature compensation
AUTO 0.0 to 99.9 °C
pH Buffer Temperature range
0.0 to 60.0°C
pH Electrode Offset recognition
±90 mV at pH 7.00
+98.3 mV / -81.7 mV at pH 6.86
pH Electrode Slope recognition
±30% at pH 4.00, 4.01, 9.18 and 10.01
Input impedance >1012ǂ
Temperature
Temperature sensor Thermistor, 10 k at 25°C
Temperature unit Default in factory
General
Power: Meter : LR44 x 4
Timer : CR2032
Battery life Meter: 30~40 Hours
Timer: 5 years
Ambient temperature range 0.0 to 50.0 °C
Display: 98x64 graphic LCD
Case IP67 water-tight case
Weight 105 g
WARRANTY
Jenco Instruments, Ltd. warrants this product to be free from
significant deviations in material and workmanship for a period
of 2 years for the meter and 6 months for the electrode from
date of purchase. If repair or adjustment is necessary and has

11
not been the result of abuse or misuse, within the warranty
period, please return-freight-prepaid and the correction of the
defect will be made free of charge. If you purchased the item
from our Jenco distributors and it is under warranty, please
contact them to notify us of the situation. Jenco Service
Department alone will determine if the product problem is due
to deviations or customer misuse.
Out-of-warranty products will be repaired on a charge basis.
RETURN OF ITEMS
Authorization must be obtained from one of our representatives
before returning items for any reason. When applying for
authorization, have the model and serial number handy,
including data regarding the reason for return. For your
protection, items must be carefully packed to prevent damage
in shipment and insured against possible damage or loss.
Jenco will not be responsible for damage resulting from
careless or insufficient packing. A fee will be charged on all
authorized returns.
NOTE: Jenco reserves the right to make improvements in
design, construction and appearance of our products without
notice.
(Version: 07302004 )
JENCO INSTRUMENTS, INC.
7968 ARJONS DR., SUITE C
SAN DIEGO, CA 92126
TEL: [phone]
FAX: [phone]
E-Mail:[email protected]
JENCO ELECTRONICS, LTD.
P.O. BOX LINKOU-117
TAIPEI HSIEN, TAIWAN,R.O.C.
TEL: [phone]
FAX: [phone]
E-Mail:[email protected]
SHANGHAI JENCO ELECTRONICS, LTD.
18 WANG DONG ZHONG ROAD,SIJING,
SONGJIANG,SHANGHAI, CHINA
TEL: [phone]
FAX: [phone]
E-Mail:[email protected]
Website:www.jenco.com.cn