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
1

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.
2
12

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.
3
1
2
3
4
5

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.
4

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”.
5

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.
6

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”.
7

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.
8

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 .]
9

SPECIFICATIONS
pH Ran
g
eResolution Accurac
y
0.00 to 14.00
p
H0.01
p
H±0.02
p
H±1LSD
Temperature
Ran
g
eResolution Accurac
y
0.0 to 99.9 °C
32.0 to 211.8 °F 0.1 °C 0.2 °F ±0.3 °C ±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
pH Buffer Temperature range
pH Electrode Offset recognition
AUTO 0.0(32.0℉) to 99.9
°C(211.8℉)
0.0 (32.0℉)to 60.0°C(140.0
℉)
±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 >10
12
Ω
Temperature
Temperature sensor Thermistor, 10 k
Ω at 25°C
Temperature unit Default in factory
General
Power Meter : LR44 x 4
Calendar : CR2032
Battery life Meter: 200 Hours
Calendar: 5 years
Ambient temperature range 0.0 to 50.0 °C
Display 98x64 graphic LCD
Case IP67 water-tight case
Weight 107 g
WARRANTY
Jenco Instruments, Ltd. warrants this product to be free from
significant deviations in material and workmanship for a period
of 1 year for the meter and 6 months for the electrode from date
of purchase. If repair or adjustment is necessary and has
10

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:05202009)
JENCO INSTRUMENTS, INC.
7968 Arjons Drive, Suite C
San Diego, CA 92126 USA
TEL: [phone]
FAX: [phone]
E-Mail: [email protected]om; [e-mail]
Website: www.jencoi.com
JENCO ELECTRONICS, LTD.
P.O. BOX 117 Jhong Jheng RD, Linkou Shiang,
Taipei, Taiwan
TEL: [phone]
FAX: [phone]
E-Mail:[email protected]
SHANGHAI JENCO INSTRUMENTS, LTD.
18 Wang Dong Zhong RD,Sijing Town, Songjiang
Shanghai, China
TEL: [phone]
FAX: [phone]
E-Mail:[email protected]
Website:www.jenco.com.cn
11

使用说明书（英文）
机型：618N 编制：TC CHEN 日期：2008-7-20
文件编号：K618N-01 修改：杨启娜 日期：2009-4-3
版本：02 核准：杨健寿 日期：2009-4-3
版本01：由618 MANUAL修改，纸型仍沿用618模式。删除了更换
日期电池部分，增加了清楚所有数据命令。
09-01-14：封面改为印刷版面，P2改插图。
09-4-3：修改P2~5，P8，P10，P11页码内容，增加BAT画面及地
址信息更正.
09-4-15: 电极头浸泡液改用3M KCL FOR 2 HOURS。