JENCO VisionPlus pH6810 User manual

Operation Manual
Hand-held pH/mV/Temperature Meter
pH6810

1
CONTENTS
GENERAL INTRODUCTION………………....................2
INITIAL INSPECTION……...………………....................2
WATER PROOF…….……...………………....................2
INSTALLING THE BATTERIES..…………....................3
DISPLAY & KEYS FUNCTIONS…..……………...…………4
A. Display ................................................................4
B. Keys.....................................................................5
OPERATIONAL PROCEDURES..…….........................6
A. Buffer Set Selection...............................................6
B. pH Calibration........................................................6
a. Calibration with an ATC/Temp probe in the
pH-AUTOLOCK mode.......................................6
b. Calibration with manual temperature compensation
in the pH-AUTOLOCK mode
……………………..7
c. Calibration with an ATC/Temp probe in the pH
NON-AUTOLOCK mode.................................8
d. Calibration with manual temperature compensation
in the pH NON-AUTOLOCK mode.........................9
C. pH Measurements................................................10
a. Measurement with an ATC/Temp probe in the
pH-AUTOLOCK mode........................................10
b. Measurement with manual temperature compensation
in the pH-AUTOLOCK mode
…………………….10
c. Measurement with an ATC/Temp probe in the pH
NON-AUTOLOCK mode................................11
d. Measurement with manual temperature compensation
in the pH NON-AUTOLOCK mode.......................11
D. Temperature Measurements..................................12
E. mV Measurements................................................12
a. Measurement in the mV-AUTOLOCK mode............12
b. Measurement in the mV NON-AUTOLOCK mode.....12
pH BUFFERS..…………………………….....................13
ERROR DISPLAYS AND TROUBLESHOOTING.......14
SPECIFICATIONS………………..……........................15
WARRANTY………………………….........................16

2
GENERAL INTRODUCTION
Thank you for selecting the pH6810 meter. The pH6810 is a
precision tool that measure pH, mV and temperature. A built-in
microprocessor stores, calculates and compensates for all
parameters related to pH determinations including pH electrode
temperature characteristics, electrode slope deviations and buffer
solutions.
This unit has a waterproof IP67 case. The touch mode keys are
highly reliable with tactile and audio feedback. This meter uses four
“AAA” batteries. Re-calibration is not required when power is
restored.
The front of the meter has a large LCD that displays pH or mV and
temperature simultaneously along with user prompts and mode
indicators. The unit prompts the user through calibration and
measurement procedures.
An AUTOLOCK feature for both pH and mV measurements enables
the unit to automatically sense the end point and “HOLD” the display
to indicate the end point value of a measurement. AUTOLOCK and
user prompts help eliminate most errors in determining pH and mV
values, resulting in precise, repeatable and error-free
measurements. The pH6810 can also be used in non-AUTOLOCK
mode.
The model pH6810 is available with pH, ORP and ATC (Automatic
Temperature Compensation) probes. Other features include
electrode offset recognition, electrode slope recognition, electrode
efficiency display, built-in buffer coefficients, automatic or manual
temperature compensation, long battery life, and 50/60Hz AC noise
rejection. This meter is user-friendly, for field, industrial and
laboratory applications.
INITIAL INSPECTION
Carefully unpack the unit 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.
WATER PROOF
Though the pH6810 meter is housed in a watertight case, DO NOT
use it underwater. The watertight case prevents permanent damage
to the unit if accidentally dropped into non-corrosive solutions.

3
Follow these steps immediately if the unit is immersed in any
solution:
1. Rinse unit carefully with distilled water. After rinsing and drying,
inspect and clean connectors to remove all contaminants that
may affect probe connections.
2. Wait for the unit and probe to dry completely before resuming
operation.
3. If the unit does not function correctly after steps1 and 2, call
JENCO for possible repair or replacement (see Warranty).
INSTALLING THE BATTERIES
The pH6810 meter is packaged with 4 “AAA” alkaline batteries
required for operation. To insert the batteries into the meter, follow
the procedure outlined below.
1. Use a screw driver to remove the two screw and battery cover to
expose the battery compartment. (Figure 1.)
2. Note the polarity and insert the batteries into the battery
compartment correctly.
3. Replace the battery cover and make sure to secure the two
screws for the water-tight feature.
[Note: Press the “On/Off” key to turn the unit on. If the unit is
running then you can press the ”On/Off “ key to turn the unit off.
The unit will automatically turn off after 20 minutes of no key
activity.]
Figure 1: Battery compartment

4
DISPLAY & KEYS FUNCTIONS
A. Display
6.86 4.00 9.18 7.00 4.01 10.01
WAIT HOLD
pH
mV
%
ATCSTAND
SLOPE
AUTO MAN °C
BAT
EFF
Figure 2: Active LCD screen
1. WAIT-
This will be displayed when the
unit is still waiting for a stable
reading or end point sensing.
6. HOLD-
This will indicate that the
reading is frozen during
AUTOLOCK mode.
2. BAT-
Low battery indicator.
7. EFF(%)-
This will be displayed if the
user is viewing the efficiency
of the electrode. It is
recommended to use a new
electrode when the efficiency
value is over than 75%.
3. ATC/MAN-
ATC indicator will be displayed
if a temperature probe is
connected otherwise the MAN
indicator will be displayed.
8. pH/mV-
Unit and mode indicators.
4. STAND/SLOPE-
This indicator will flash if the
STAND or SLOPE is not yet
calibrated. This indicator will
remain lit-up if the STAND or
SLOPE has been calibrated
respectively.
9. Main display for pH, mV
and probe efficiency values
5. AUTO-
AUTOLOCK mode indicator. 10. Temperature and unit
display

5
B. Keys
On/Off-
Powers on and shuts off the meter.
Mode
Mode-
Selects display mode. Pressing this key changes the
display sequentially to display pH-AUTOLOCK,
mV-AUTOLOCK, pH and mV. The calibration values
will not be affected by changing the display modes.
In “pH calibration”, press “Mode” key to exit the two
point calibration mode.
Clear
Clear-
It is used to clear the unit when error signal appears.
It clears all calibration values stored in the internal
memory.
Under normal use the key will not be activated unless
pressed and held for 2 seconds to prevent accidental
erasing stored memory.
When the Clear key is pressed, all segments of the
LCD will be on. After about 2 seconds the unit will
enter the pH-AUTOLOCK mode. The “AUTO” will be
on and “STAND” will start to flash. This means that
the unit must be calibrated.
Up/Down-
The two keys are used to manually enter the
temperature values. They have no effect on the unit
when operating in ATC mode.
Stand
Slope
Stand/Slope-
The Stand and Slope keys are used for dual or three
point pH calibration of the unit. Pressing and holding
the Stand key while turning on the power, will
change the buffer set to the other available buffer set.
Mea.
Eff.
Mea. / Eff.-
The key is used to bring the unit out of the
AUTOLOCK condition when operating in the
pH-AUTOLOCK or mV-AUTOLOCK mode.
Press and hold this key for 5 seconds, the LCD will
display the efficiency of the electrode.

6
OPERATIONALPROCEDURES
A. Buffer Set Selection
The pH6810 meter has two buffer sets: 7.00, 4.01, 10.01pH and
6.86, 4.00, 9.18pH. The meter is factory pre-set at 7.00, 4.01 and
10.01pH.
To change the buffer set, turn off the unit, then press and hold the
“Stand” key while turning on the unit again.
[Note: There is no need to repeat this procedure every time the unit is
power up unless one decides to change the buffer settings.]
B. pH Calibration
The pH6810 uses 2-point or 3-point calibration. The first point must
be 6.86/7.00, and the second point can either be 4.00/4.01 or 9.18
/ 10.01 .
a. Calibration with an ATC/Temp probe in the pH-AUTOLOCK
mode.
1. Turn the unit on. Press “Clear” key for 2 seconds, all LCD
elements will lit up. The meter clears all calibration values
storedininternalmemory.
2. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit:
“ATC” icon will lit up. “pH” icon and “AUTO” icon lit up. The
“STAND” icon will flash.
3. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution (either 7.00 or 6.86).
Allow temperature reading to stabilize, then press and hold
“Stand” key for 5 seconds to calibrate. The “WAIT” icon will
flash until the unit detects a stable reading. Once the unit
calibrates the first point, the “SLOPE” icon will flash. The unit
is ready to be sloped at the second buffer. .
4. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either 4.00/4.01
or 9.18/10.01). Allow temperature reading to stabilize, then
press “Slope” key to calibrate. The “WAIT” icon will flash until
the unit detects a stable reading. Once the unit calibrates the
second point, the “SLOPE” icon will flash. The unit is ready to
be sloped at the third buffer.
[Note: At this moment, press the “Mode” key, the unit will exit
the calibration mode. Dual point calibration is complete.]

7
5. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the third buffer solution (either 9.18/10.01 or
4.00/4.01). Allow temperature reading to stabilize, then press
“Slope” key to calibrate. The “WAIT” icon will flash until the
unit detects a stable reading. Once the unit calibrates the
third point and the unit will automatically exit the calibration
mode. Three points calibration is complete.
6. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the three
calibration buffers. After calibration, press and hold “Mea./Eff.”
key for about 5 seconds to display the new electrode
efficiency.
b. Calibration with manual temperature compensation in the
pH-AUTOLOCK mode.
1. Turn the unit on. Press “Clear” key for 2 seconds, all LCD
elements will lit up. The meter clears all calibration values
storedininternalmemory.
2. Connect the pH electrode to the BNC connector of the unit,
“MAN” icon will lit up. “pH” icon and “AUTO” icon lit up. The
“STAND” icon will flash.
3. Rinse the pH probes in distilled water and immerse it in the
first buffer solution (either 7.00 or 6.86). Adjust the temperature
reading to that of the first buffer using the up or down keys (0.0
to 60.0℃) before pressing “Stand” key. Then press and hold
“Stand” key for 5 seconds to calibrate. The “WAIT” icon will
flash until the unit detects a stable reading. Once the unit
calibrates the first point, the “SLOPE” icon will flash. The unit
is ready to be sloped at the second buffer. .
4. Rinse the pH probe in distilled water and immerse it in the
second buffer solution (either 4.00/4.01 or 9.18/10.01), then
press “Slope” key to calibrate. The “WAIT” icon will flash until
the unit detects a stable reading. Once the unit calibrates the
second point, the “SLOPE” icon will flash. The unit is ready to
be sloped at the third buffer.
[Note: At this moment, press the “Mode” key, the unit will exit
the calibration mode. Dual point calibration is complete.]
5. Rinse the pH probe in distilled water and immerse it in the
third buffer solution (either 9.18/10.01 or 4.00/4.01), then
press “Slope” key to calibrate. The “WAIT” icon will flash until
the unit detects a stable reading. Once the unit calibrates the
third point and the unit will automatically exit the calibration

8
mode. Three points calibration is complete.
6. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the three
calibration buffers. After calibration, press and hold “Mea./Eff.”
key for about 5 seconds to display the new electrode
efficiency.
c. Calibration with an ATC/Temp probe in the pH NON-
AUTOLOCK mode.
1. Turn the unit on. Press “Clear” key for 2 seconds, all LCD
elements will lit up. The meter clears all calibration values
storedininternalmemory.
2. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit:
“ATC” icon will lit up. “pH” icon is on. The “STAND” icon will
flash.
3. Rinse the pH and ATC/Temp probes in distilled water and
immerse them in the first buffer solution (either 7.00 or 6.86).
Allow temperature reading to stabilize, then press and hold
“Stand” key for 5 seconds to calibrate. Once the unit calibrates
the first point, the “SLOPE” icon will flash. The unit is ready to
be sloped at the second buffer. .
4. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the second buffer solution (either 4.00/4.01
or 9.18/10.01). Allow temperature reading to stabilize, then
press “Slope” key to calibrate. Once the unit calibrates the
second point, the “SLOPE” icon will flash. The unit is ready to
be sloped at the third buffer.
[Note: At this moment, press the “Mode” key, the unit will exit
the calibration mode. Dual point calibration is complete.]
5. Rinse the pH and ATC/Temp probe in distilled water and
immerse them in the third buffer solution (either 9.18/10.01 or
4.00/4.01). Allow temperature reading to stabilize, then press
“Slope” key to calibrate. Once the unit calibrates the third
point and the unit will automatically exit the calibration mode.
Three points calibration is complete.
6. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the three
calibration buffers. After calibration, press and hold “Mea./Eff.”
key for about 5 seconds to display the new electrode
efficiency.

9
d. Calibration with manual temperature compensation in the
pH NON-AUTOLOCK mode.
1. Turn the unit on. Press “Clear” key for 2 seconds, all LCD
elements will lit up. The meter clears all calibration values
storedininternalmemory.
2. Connect the pH electrode to the BNC connector of the unit,
“MAN” icon will lit up. Press “Mode” key until “pH” icon is on.
The “STAND” icon will flash.
3. Rinse the pH probes in distilled water and immerse it in the
first buffer solution (either 7.00 or 6.86). Adjust the temperature
reading to that of the first buffer using the up or down keys (0.0
to 60.0℃) before pressing “Stand” key. Then press and hold
“Stand” key for 5 seconds to calibrate. Once the unit calibrates
the first point, the “SLOPE” icon will flash. The unit is ready to
be sloped at the second buffer. .
4. Rinse the pH probe in distilled water and immerse it in the
second buffer solution (either 4.00/4.01 or 9.18/10.01), then
press “Slope” key to calibrate. Once the unit calibrates the
second point, the “SLOPE” icon will flash. The unit is ready to
be sloped at the third buffer.
[Note: At this moment, press the “Mode” key, the unit will exit
the calibration mode. Dual point calibration is complete.]
5. Rinse the pH probe in distilled water and immerse it in the
third buffer solution (either 9.18/10.01 or 4.00/4.01), then
press “Slope” key to calibrate. Once the unit calibrates the
third point and the unit will automatically exit the calibration
mode. Three points calibration is complete.
6. The unit calculates and compensates for the pH electrode
slope deviation corresponding to the values of the three
calibration buffers. After calibration, press and hold “Mea./Eff.”
key for about 5 seconds to display the new electrode
efficiency.
[Note: For accurate measurements, it is recommended that pH
calibration is preformed once a week and after replacing the
electrode.]

10
C. pH Measurements
To take pH measurements, “STAND” and “SLOPE” icon must be on,
indicating the unit is either dual-point or three-point calibrated and
ready for measurements. If “STAND” and “SLOPE” flash, perform a
pH calibration before taking measurements.
a. Measurement with an ATC/Temp probe in the pH-
AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit. The
“ATC” icon will lit up.
2. Press “Mode” key until “pH” icon and “AUTO” icon lit up.
3. Rinse the pH electrode and ATC/temp probe with distilled
water and immerse in the sample to be measured. Remove
any air bubbles trapped around the probe by shaking or
stirring the probe.
4. Press the “Mea.” key. The “WAIT” icon will start flashing. The
unit is waiting for a stable reading. The display will track the pH
value as sensed by the pH electrode and the ATC/Temp
probe.
5. When the “WAIT” icon disappears, the reading is then “HOLD”
and will not respond to further changes from the sample. The
pH value shown is the pH value of the sample at the displayed
sample temperature.
[Note: For samples that are inherently unstable, the unit will
not AUTOLOCK. In this case, use the pH NON- AUTOLOCK
mode for measurements.]
b. Measurement with manual temperature compensation in
the pH-AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector of the unit.
The “MAN” icon will lit up. Set unit to display the sample
temperature by pressing the up and down keys(-10.0 to 120.0
℃).
2. Press “Mode” key until “pH” icon and “AUTO” icon lit up.
3. Rinse the pH electrode probe with distilled water and immerse
in the sample to be measured. Remove any air bubbles
trapped around the probe by shaking or stirring the probe.

11
4. Press the “Mea.” key. The “WAIT” icon will start flashing. The
unit is waiting for a stable reading. The display will track the pH
value as sensed by the pH electrode probe.
5. When the “WAIT” icon disappears, the reading is then “HOLD”
and will not respond to further changes from sample. The pH
value shown is the pH value of the sample at the set sample
temperature.
[Note: For samples that are inherently unstable, the
instrument will not AUTOLOCK. In this case, use the pH
NON- AUTOLOCK mode for measurements.]
c. Measurement with an ATC/Temp probe in the pH NON-
AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector and the
ATC/Temp probe to the ATC/Temp connector of the unit. The
“ATC” icon will lit up.
2. Press “Mode” key until “pH” icon lit up.
3. Rinse the pH electrode and ATC/temp probe with distilled
water and immerse in the sample to be measured.
4. Allow sufficient time for the display to stabilize. The instrument
will display the pH value of the sample at the displayed sample
temperature.
d. Measurement with manual temperature compensation in
the pH NON-AUTOLOCK mode.
1. Connect the pH electrode to the BNC connector of the unit.
The “MAN” icon will lit up.
2. Press “Mode” key until “pH” icon lit up.
3. Rinse the pH electrode probe with distilled water and immerse
in the sample to be measured.
4. Allow sufficient time for the display to stabilize. The instrument
will display the pH value of the sample at the set sample
temperature.

12
D. Temperature Measure
The pH6810 can measure temperature independently with the
ATC/temp probe without using the pH electrode. Place the
ATC/temp probe in the sample. The unit will display the measured
temperature.
E. mV Measurements
a. Measurement in the mV-AUTOLOCK mode.
1. Connect the optional combination ORP electrode to the BNC
connector of the unit.
2. Press “Mode” key until “mV” icon and “AUTO” icon lit up.
3. Rinse electrode with distilled water and immerse it in sample to
be measured.
4. Press the “Mea.” key. The “WAIT” icon will start flashing. The
unit is waiting for a stable reading. The display will track the mV
value as sensed by the ORP electrode
5. When the “WAIT” icon disappears, the reading is then “HOLD”
and will not respond to further changes from the sample. The
mV value is the sample reading.
[Note: For samples that are inherently unstable, the unit will
not AUTOLOCK. In this case, use the pH NON- AUTOLOCK
mode for measurements.]
b. Measurement in the mV NON-AUTOLOCK mode.
1. Connect the optional combination ORP electrode to the BNC
connector of the unit.
2. Press “Mode” key until “mV” icon lit up.
3. Rinse electrode with distilled water and immerse it in sample to
be measured.
4. Allow sufficient time for the display to stabilize. The instrument
will display the mV value of the sample.

13
pH BUFFERS
The temperature coefficient of pH calibration buffers 4.01, 6.86,
7.00,9.18 and 10.01 are stored inside the instrument. The buffers
used to calibrate the instrument must exhibit the same temperature
characteristics as the stored values.
Temperature coefficient of the pH buffers
℃4.00 6.86 9.18 4.01 7.00 10.01
0 4.01 6.98 9.46 4.01 7.11 10.32
5 4.00 6.95 9.39 4.01 7.08 10.25
10 4.00 6.92 9.33 4.00 7.06 10.18
15 4.00 6.90 9.28 4.00 7.03 10.12
20 4.00 6.88 9.23 4.00 7.01 10.06
25 4.00 6.86 9.18 4.01 7.00 10.01
30 4.01 6.85 9.14 4.01 6.98 9.97
35 4.02 6.84 9.10 4.02 6.98 9.93
40 4.03 6.84 9.07 4.03 6.97 9.89
45 4.04 6.83 9.04 4.04 6.97 9.86
50 4.06 6.83 9.02 4.06 6.97 9.83
55 4.07 6.83 8.99 4.08 6.97 9.80
60 4.09 6.84 8.97 4.10 6.98 9.78
[Note: The actual reading of the instrument can differ from the
values shown by ±0.01pH.]

14
ERROR DISPLAYS AND TROUBLESHOOTING
[Note: If the meter still does not perform normally after the above
measures are taken, call Jenco Service Department.]
Main
Display Possible cause(s) Corrective Action(s)
"Er1"
1. “Stand” was pressed
before the electrode and
ATC/Temp probe settled
to within +/-1.5 pH of the
buffer value.
2. pH electrode offset is
greater / less than +/-1.5
pH.
3. pH electrode is faulty.
1. Press “Clear” key, allow
sufficient time for the
electrode and ATC/Temp
probe to stabilize, re-press
“Stand” key to start the
calibration procedure.
2. Replace the buffer and /or
the pH electrode. Press
“Clear” key to recalibrate
meter.
3. Replace electrode.
"Er2"
1. “Slope” was pressed
before the electrode and
ATC/Temp probe settled
to within 30% of the
buffer value.
2. Buffer 4.00, 4.01, 9.18
and 10.01 is not correct.
3. pH electrode slope is off
by more than 30% of
ideal slope.
1. Allow sufficient time for the
electrode and ATC/Temp
probe to stabilize, re-press
“Slope” key to continue the
calibration procedure.
2. Check if the correct buffer is
used.
3. Replace the buffer and /or
the pH electrode. Press
“Clear” key to recalibrate
meter.
"Er3" 1. Temperature is out of the
0.0 to 60.0°C range.
1. Bring the buffer temperature
within range.
"over"
/ ”undr”
1. Measured pH is out of
the –2.00 to 16.00 pH
range.
2. Measured mV is out of
the –1999 to 1999 mV
range.
3. Measured temperature is
out of the –10.0 to
120.0°C range.
1. Bring sample pH into the
correct measuring range.
2. Bring sample ORP into the
correct measuring range.
3. Bring sample temperature
into the correct measuring
range.

15
SPECIFICATIONS
Display Range Resolution Accuracy
pH -2.00 to 16.00 pH 0.01 pH ±0.1%FS ± 2 digits
mV -1999 to 1999 mV 1 mV ±0.1%FS ± 2 digits
Temperature -10.0 to 120.0 °C 0.1 °C ±0.5°C
pH buffer recognition pH 7.00, 4.01, 10.01 or pH
6.86, 4.00, 9.18
pH Temperature compensation AUTO/MAN –10.0°C to
120.0 °C
pH Buffer Temperature range 0°C to 60.0°C
pH Electrode Offset recognition ±90 mV at pH 7.00 or 6.86
pH Electrode Slope recognition ±30% at pH 4.00, 4.01, 9.18
and 10.01
Input impedance >10
12
Ω
Temperature sensor Thermistor, 10 k Ω at 25°C
Power Four “AAA” Batteries
Battery Life ~1000 Hours
Calibration Back-up EEPROM
Audio Feedback All Touch Keys
End Point Sensing & Hold Yes
Display (pH /mV : Temp) 11mm : 7mm high LCD
Ambient Temperature Range 0 to 50 °C
Relative Humidity up to 90%
Case IP67 water-tight case
Dimensions (W x D x H) 75mm x 157mm x 35mm
Weight 230 grams
(Batteries included)

16
WARRANTY
Jenco warrants this product to be free from significant deviations
in material and workmanship for a period of 1 year from date of
purchase. If repair or adjustment is necessary and has not been
the result of abuse or misuse, within the year 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.