Ponpe 8351 User manual

OPERATION MANUAL
PEN TYPE
WATER QUALITY
METER
Model:
8361, Cond.&TDS meter
8351, Cond. meter
8371, Salinity meter

INTRODUCTION
Congratulations on your purchase of
this pen type meter. Please read the
manual completely before using this meter.
Filing and keeping the manual for future
reference. Recommended to soak the
electrode for at least 30 min. before using
to clear up the lazy effect.
Features:
IP65 Waterproof housing.
Dual display with ATC
Data hold to freeze readings.
Pen size, easy to fit in pocket.
Low battery indicator.
Auto power off.
C/F unit switchable.
Power by 4pcs LR44 batteries.
Multi points calibration.
One touch only for calibration.
MATERIAL SUPPLIED
This package contains:
The meter x 1
LR44 button battery x 4
Operation manual
Color box or plain box
POWER SUPPLY
The meter is powered by 4 pcs LR44
batteries. To check the battery when:
1. First time use
2.
3.
1
The battery symbol appears on LCD
The meter can not power on

To install the batteries:
1. Turn off the meter.
2.
3. Replace the old batteries with four new
button cells LR44.
Loose the battery cover in counter-
clockwise direction. (DON'T discard the
black washer!)
4. Make sure the batteries are in place
and the polarity is correct.
5. Put back the battery cover and
turn it
tightly in clockwise direction.
1. Remove battery from instruments
that you do not plan to use for a
month or more. Do not leave battery
in instrument.
NOTE:
2

LCD DISPLAY
-The 1st display
shows the measured
reading.
-The 2nd display
shows the reading
of temp.
-Cal=Calibration mode
-Hold=Data hold
-uS or mS is the unit
of Conductivity
-ppt or ppm is the unit
of TDS and Salinity
-C or F is the unit of
liquid temprature
- is the battery low
icon
8351/8371 8361
KEYPAD
OPERATION
1. Remove the probe cover from meter
to expose the electrode out.
3
2. Press “ " to power on the meter.
LCD will display parameters (ex: tnr,
tCo, tds, rAn) in turns and then enter
normal display.

4
Remove the cover
from the bottom
of meter to expose
the electrode.
Electrode
3.
The meter is default in auto-ranging
status once powered on.
Auto-ranging determines and selects
a range which gives you the greatest
resolution and accuracy. Alternatively,
you can manually select the ranges.
For example, if you prefer the meter
to display a reading as 0.50 mS
instead of 500 µS, you just need to
press “ “ m
select 19.99 mS range when you
are in normal measurement mode.
ore than 2 seconds
to
NOTE:
Accuracy is a percent of full-scale,
so using your meter in the lowest
range will result in the greatest
accuracy.
The LCD will display E02/E03 if the
measured value is below or over the
limit value, please re-select the range.
1.
2.
See page 12
for the detail

Set the temperature coefficient to
the right value. The meter is factory
set to 2.1% per °C and this normally
can provide good results. See page
9 to set the temperature coefficient
if needed.
Select the normalization temperature.
The meter is factory set to 25 °C. If
you need to normalize the meter to
20 °C, see page 9
Rinse the probe with deionized or
distilled water before use to remove
any impurities adhering to the
electrode. If the meter is not
used for a long time, please soak the
probe more than 30 minutes to clear
up the lazy effect of probe.
Dip the probe into the sample. Make
sure there are no air bubbles trapped
in the slot of the probe. To remove
air bubbles, give the probe a gentle
stir. Making sure the electrode tip
is submerged when you stir it.
Stir the probe gently in the sample
to create a homogenous sample.
Allow a few seconds to reach temp.
equilibrium. (Wait about 15 minutes
can get a stable reading)
for the details.
The unit of measurement
will flash on the LCD to
indicate the meter is in
measurement mode. When
the reading is stable, the unit
will stop flashing.
8351
4.
5.
6.
7.
8.
9.
5

“ "
Press to freeze
current readings. The text
"Hold" will appear on the
LCD. P ress " " again to
release.
8351
In 8361 measurement mode, press
" " to switch to conductivity or TDS
mode. The units for conductivity are
uS or mS. The units for TDS are ppm
or ppt.
Cond.
TDS
6
In TDS measurement mode, you can
press " " more than 2 seconds to
select manual ranging. (See details in
page11)
10.
TDS Measurement:
Set the TDS conversion factor to right
value. The factory default is 0.50.
To change the TDS factors, refer
Appendix B in page 24.
11.
Salinity Measurement:
12.
8371 is designed for salt measurement.
When in SALT mode, Built-in NaCL
conductivity to TDS conversion factor,
Temp. Coefficient and Normalization
Temperature are all fixed.
You may follow up steps 3-10 to
proceed the salt measurement.
See page 12
for the detail

13.Turn off the meter by pressing " ".
a) Make sure your electrode is clean!
b) Store the electrode carefully!
Before storage, rinse it carefully in
deionised water and store dry. Put
back the cap and store the meter
under
See the details in page 20.
o
0~50 C.
14.Electrode Maintenance:
This meter will shut off automatically 20
minutes of inactivity. For operating longer
time, you can disable the sleep mode.
To disable the auto power off:
NOTE:
The disable sleep mode will
be invalid after every power off.
AUTO POWER OFF
(SLEEP FUNCTION)
" "
Before power on, pressing " " +
keys simultaneously until a
"n" appeared on the screen
and then release keys to return
to normal mode.
SETUP
The advanced setup mode lets you
customized your meter’s preferences
and defaults.
7
14.Accuracy & Air bubbles:
The air bubbles are easy to adhere
around the gap between electrode
and meter and will affect the accuracy
a lot. See page 21 for the details of
how to remove the air bubbles.

When meter is in measurement mode,
press " " more than 2 sec to enter
setup mode. Press " "or " " or
" " to select
momentarily again to enter unit setting.
Press " " or " " to select C /F.
Press " " momentarily to confirm the
unit or press " " more than 2 sec to
return to P1.0 without saving.
After confirming the unit, you can
continuously set another temp. related
parameters (except 8371) or press
" " more than 2 seconds to return
to P1.0.
While in P1.0, press " " for more
than 2 seconds to return to measure-
ment mode.
P1.0, then press " "
or
Short
press
Long
press or
Long
press
P1.0: temperature parameter setting: (t)
To change the parameters, you can
press " " more than 2 sec. to enter
setup mode when the meter is in
measurement mode.
P1.1: Change temperature unit (tUt):
8

9
After saving the unit setting, the meter
will automatically enter normalization
temp. adjustment.
P1.3:
In temp. coefficient adjustment
P1.2: Normalization temp.(tnr):
Press " "or " "
o
to change the temperature to 20 C
o
or 25 C. Press " " momentarily to
confirm the value and meter will enter
next step or press " " more than 2
sec to return to P1.0 without saving.
Temp. Coefficient (tCo)
, press
" " or " " or " " to change the
temperature coefficient from 0.0 to
4.0. Press " " momentarily to
confirm the value or press " " more
than 2 sec to return to P1.0 without
confirming the P1.3 value.
NOTE:
The text P1.1, P1.2, P1.3, P2.1, P3.1
will not display on LCD.
NOTE:
P1.2, 1.3 are invalid in 8371.
P1.1 P1.2 P1.3

P2.0: TDS factor setting: (tdS,8361 only)
P2.1: Setting TDS factor(tds):
In P2.0, press " " momentarily to
enter P2.1. (P2.1 will not display on
LCD). The factor will flash on LCD.
Press " " or " " to change factor
from 0.40 to 1.00. Press " " momen-
tarily to confirm the value and meter
will return to P2.0. Or pressing " "
more than 2 seconds to return to
P2. 0 without confirming the value.
P3.0: Reset meter: (rSt)
In P2.0, press " " or " " to enter P3.0.
When you decide to reset the meter, all
parameters will be reset to factor default
values include the calibration info.
NOTE:
Pay attention
to the diffe-
rence between
short or long
press " "
after setting
the tds value.
10
In P1.0, press " " to select P2.0.
P3.1: Reset
In P3.0, press " " momentarily to
enter P3.1. Press " " or " "to select
Y or N. Press " " momentarily to
confirm the state and return to P3.0.
Or press " " more than 2 seconds
to return to P3. 0 without confirming
the P3.1 value.

P4.0: Review Calibration Info.: (CAL)
Select measure range: (rAn, 8351/61/71)
11
NOTE:
P4.1 & 4.2 are
only for you
to "review" the
calibration
information.
Not for
calibration.
P4.1: Range 1 calibration info.:
In P4.0, press " " momentarily to
enter P4.1 and you can see the last
calibration concentration. If the meter
is not yet calibrated, "---" will display
on the LCD.
In P3.0, press" " or " " to select P4.0.
P4.2: Range 2 calibration info.:
In P4.1, press " " or " " to enter
P4.2 and you can see the last cal.
concentration. If range 2 is not yet
calibrated, "---" will display on LCD.
In P4.1 or P4.2, press " " momen-
tarily to confirm the state and return
to P4.0.
Two measurement ranges are available
for 8351/61/71. The default mode
is automatically ranging.
Range 1
Range 2
0~1999uS 0~1999uS or 1999ppm
0~19.99mS 0~19.99mS or 19.99ppt
8351 8361
ppt=parts per thousand
COND. COND. TDS
8371
SALT
0~10.00ppt
10.1~70.0ppt
NOTE:
In P1.0, P2.0, P3.0, P4.0, you can
press " " more than 2 seconds to
return to normal measurement mode.

2.Press " " or " " more than 2
seconds to select the range.
CALIBRATION MODE (CAL)
12
To manual select the measurement
range:
1. Turn on the meter and stay at normal
measurement mode.
(Default)
Press" "
> 2 second
Press" "
> 2 second
PREPARATION FOR CALIBRATION
Two issues need to be prepared and
considered before operation. First,
what is the right calibration standard?
Second, when should you calibrate?
Selecting a calibration standard
For best results, select a conductivity
or TDS (8361) or NaCl (8371) standard
near the sample value you are measuring.
Alternatively, use a calibration solution
value which is approximate 2/3 of the
full scale of the measurement range you
plan to use.
For example, in the 0 to 1999 uS range,
use 1413 uS solution for calibration.
DO NOT reuse the calibration solution.
Contaminants in the solution will affect
the calibration and the accuracy. Be
sure to use fresh solution each time.

13
TDS measuring
range (factor=0.5)
Recommended cal.
solution range
0.00~999ppm
0.0~9.99ppt
300~850ppm
3.00~8.50ppm
1
2
Please refer to below table. Strongly
suggest to use the recommended
solution for different conductivity and
TDS ranges.
Conductivity
measuring range
Recommended cal.
solution range
0~1999uS
0~19.99mS
600~1700uS
6.00~17.00mS
1
2
The previous calibration data will be
replaced after re-calibration. For
example, if you previously calibrated
conductivity meter at 1413 uS in the 0
to 1999 uS range, when you re-calibrate
it at 1500 uS again (also in the 0 to
1999uS range), the previous 1413uS
will be replaced in this range (0~1999uS).
However, the meter will retain the
calibration data for other ranges which
are not yet re-calibrated.
NOTE:
The temperature coefficient of the meter
o
is defaulted at 2.1% per C and provides
good results for most applications.
Please see Program P1.3 on page 9
if you need to reset the coefficient.
You could also refer to Appendix D to
calculate the temperature coefficient
and determine the appropriate
temperature coefficient for solution.
NOTE:
The default value of normalization
o
temperature is 25 C. If you need to
normalize to another value, please see
Program P1.2 on page 9 . Before

14
resetting this value, the calibration
standard value of that normalized temp.
must be known. You could refer to the
datasheet enclosed with your solution.
When should you do the calibration?
Calibration is necessary and should be
done regularly.
-If you are measuring the mid-ranges,
calibrate the meter at least once a month.
Soak the probe for 15 mins
before calibration or measurement can
saturate the probe surface and minimize
drift.
-If measure at the extreme temperatures
or in below concentration, calibrate the
meter at least once a week to get specified
accuracy.
Model Concentration
8351
8361
8371
<100uS
<100uS or
<100*TDS factor ppm
<0.10ppt
>2mS
>2mS or
>2*TDS factor ppm
>5.0ppt
CONDUCTIVITY CALIBRATION
1.
2.
3.
4.
Insert the probe into demineralized
water or distilled water for about 30
minutes to rinse the probe.
Select the conductivity standard for
calibration. ( See page 13)
Pour 3 cm height of the solution into
two separate clean containers.
Power on the meter. Select the mode
as conductivity measurement mode.
5.Rinse the probe into one of above
containers. Gently stir the probe.
Please follow up below steps to proceed
the conductivity calibration:

6.Dip the rinsed probe into the other
container. Tap probe on the bottom
of container to remove air bubbles.
Let the probe stabilize to the solution
temperature ( wait about 15 mins)
7.Press “ “ more than2 seconds to
begin calibration. The conductivity
value of solution will blink on LCD.
limit, the displayed
value will equal to the range limit or
10% of range limit.
NOTE:
If the standard buffer is over the
measuring limit or less than 10% of
measuring
8. Press “ “ or “ “ and “ “ to
change the value in order to match
the value to the standard which is
o
referred to normalization temp. 25 C
You can adjust the conductivity
reading up to +30% from the detected
value. However, if your detected value
and standard value differs by more
than +30%, it means cleaning or
replacing meter is needed.
For example:
Standard: 10uS; Detected value:19uS
Adjustable range: +5.7us (19*30%)
However, under above situation, the
values already differed over 30%.
For example 1:
Standard: 22uS; Detected value:19uS
Adjustable range: +5.7us (19*30%)
The values differ less than 30% but the
22uS is already over range limit. So,
the maximum value could be input is
19.99uS only.
15

9 When the “CAL” stop flashing, you l
can press” “ less than 1 second
to confirm the value. The meter then
return to conductivity measurement
mode.
If the “CAL” always blinks, please
check the calibration solutions and
make sure it is stable and your input
value in step 8 is correct.
For example 2:
Standard: 1.6mS; Detected :2.1mS
Adjustable range: +0.63ms (2.1*30%)
The values differ less than 30% but
the 1.6mS is already less than
10% range limit (1.99).So, the max.
value could be input is 1.99mS only
Repeat 1~9 for other ranges if needed.
NOTE:
When switch the meter from measure-
ment to calibration mode, the meter
will display the factory default value.
So, if the meter was previously
calibrated, the display may seem to
jump to the factory default value when
entering calibration.
NOTE:
To exit conductivity calibration mode
without confirming calibration, you can
press ” “ ( in step9) more than 2
seconds. This lets you retain the meter's
previous calibration data for the current
range which you proceed.
10.
16

Please follow up below steps to proceed
the calibration:
Option1: Using TDS standards
1.
2.
Insert the probe into demineralized
or distilled water for about 30 minutes
to rinse the probe.
Select the TDS standard for calibration.
The factory default setting of the TDS
conversion factor is 0.50. If your
solution has a different TDS factor,
you can improve the calibration
accuracy by setting the TDS factor
before starting the calibration.
To converse the TDS factors to the
correct value, please see Appendix
B or refer to the value provided by
standard solution manufacturer.
3.
4. Turn
Pour 3 cm height of the solution into
two separate & clean containers.
on the meter. Press the “ “
to select TDS mode.
5. Rinse the probe into one of the
containers. Gently stir the probe.
6. Dip the rinsed probe into the other
container. Tap the probe on the bottom
of container to remove air bubbles.
Let the probe stabilize to the solution
temperature.
17
There are two options for you to do the
TDS calibration.
TDS CALIBRATION (MODEL:8361)
7. Press “ “ more than 2 seconds
to begin the calibration. The TDS
value will blink on the LCD.
8. Press the “ “ or “ “ to adjust
the value to match the value to the
standard solution which is referred
to normalization temperature.
o
The meter is defaulted at 25 C

18
NOTE:
Please refer to the three notes
in page 15&16.
9.When “CAL” stop flashing, you can
press “ “ less than 1 second
to confirm the value. The meter will
switch back to TDS normal mode.
10. Repeat 1~9 for other ranges if needed.
TDS values are related to conductivity.
You can calibrate the meter by using
conductivity standards as described
above and then program the meter with
a given conversion factor. Please refer
to below steps:
1. Perform the conductivity calibration
procedure on page 14 ~16.
2. Select the correct Conductivity-to-
TDS conversion factor. You can refer
to Appendix B or calculate the TDS
conversion factor for other solutions
using the formula show in Appendix C
3. Refer to P2.1 (in page 10) to check
the procedures of how to set the
factor.
Option2: Using Conversion Factors
SALT CALIBRATION (MODEL:8371)
Please follow up below steps to proceed
the salinity calibration:
1. Insert the probe into demineralized
or distilled water for about 30 minutes
to rinse the probe.
2. Select the Sodium Chloride standard
which is closed to your measurement
range.

3. Pour 3 cm height of the standard into
two separate & clean containers.
4. Turn on the meter.
5.Rinse the probe in one of the contai-
ners. Gently stir the probe. Rinsing
could remove contaminants that affect
the calibration and could prevent error.
6. Dip the rinsed probe into the other
container. Tap the probe at bottom of
container to remove air bubbles. Let
the probe stabilize to the solution
temperature.
7. Press “ “ >2 sec. to begin the
calibration. The SALT value will blink
on the LCD.
8.Pressing the “ “ or “ “ to adjust
the value to match the value to the
calibration standard.
You can adjust the SALT reading up
to +30% from the detected value. If
the detected value and standard
values differs by more than +30%,
it means clean electrode is needed.
9.When the “CAL” stop blinks. You can
press “ “ to confirm the value.
The meter will switch back to SALT
measurement mode.
If the “CAL” always blinks, please
check the solution and make sure
it is stable and the input in step 8
equals to the solution value.
NOTE:
Please refer to the three notes
in page15 & 16.
19