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