Sper Scientific 850038 User Manual
Conductivity, TDS,
Salinity Meter
850038
Instruction Manual
SPER
SCIENTIFIC
INDEX
Introduction..............................................1
MaterialSupplied....................................1
Ports&Probe ............................................1
Specifications .........................................2
LCDDisplay ..................................................2
KeypadOperation ........................................4
Auto Shut Off .................................. 6
RecallMode ..............................................7
ReviewMode.................................................7
Peparation For Calibration.............. 8
ConductivityCalibration .........................11
TDS Calibration.......................................14
SaltCalibration .......................................16
ConductivityMeasurement....................18
TDS Measurement ................................20
SalinityMeasurement.............................21
ParametersSetting.................................23
Maintenance& Storage..........................35
Trouble Shooting..................................... 36
Warranty ......................................................... 37
IrDATransmission..................................38
RS232Output ........................................39
AppendixA..............................................40
AppendixB .............................................41
AppendixC..............................................41
AppendixD..............................................42
INTRODUCTION
This meter measures conductivity value
in uS and mS, as well as total dissolved
solids (TDS) and Salinity. Simultaneously
displays readings, time, date, and temperature in °C or °F.
Features a detachable probe, ATC, 99
memory points, min-max-average, hold,
RS232 port, large LCD, auto shut off, and
indicators for low battery and over range.
MATERIAL SUPPLIED
This package contains:
Meter
Probe
Batteries AAA x 4pcs
Instruction manual
Hard carrying case
Meter
PORTS & PROBE
Top view
Conductivity probe
connector port
Probe
Connector
to meter
~ 87 cm
Right side view
IrDA port
3x10mm sensing
area on each side
Standard probe
*ABS body, graphite cell.
*Highest durability with
Temp.
reliable measurements.
sensor
*Integral temperature.
inside
*Temperature steady
time <10 seconds.
1
DC 9V
RS232
DISPLAY
Themeterwill briefly displayall
LCDsegmentswhen it is first
turnedon.
The primary display shows:
Themeasuredconductivityvalue
(CON) in uS or mS per cm.
TDS in ppm or ppt
Salinity in ppt
The secondary display below
the primary display shows:
The temperature of the reading.
Year/Month/Date and
Hour/Min/Sec (displayed
at the bottom of the screen).
HLD(Hold),Max,Min,Avg,
ReadyandATC are shownon
theleftside of the screen.
REC (Recall)isshownatthe left
bottom left.
The top right number ("88")
indicates the records in
memory.
3
KEYPAD OPERATION
1. SET (Power) key:
Turn on the meter by pressing
the SET key. The entire display
flashes. Once the m,eter is on,
press this key for more than 2
seconds to enter the
settings m,ode.
Manually turn the meter off by
pressing and releasing this key.
2. ▲ MODE key:
Press the Mode key to switch
between the displayed
measurements for conductivity
(CON), TDS, or Salinity (SALT).
4
3. CAL/Esc key:
ATC
CON
H:M:SouS
ATC
Y.M.D
CON
o
uS
In normal mode, press this key > 2
seconds to enter calibration mode.
While the meter is in calibration, setting
or recall mode, press this key (Esc) to
return to previous mode.
4. MEM :
In normal mode, press this key to store
the current reading with RTC (real time
clock), the primary display will flash 3
times. The occupied memory number
(88 on the top right corner) changes
from xx to yy, eg: 00 to 01 .(Fig. A& B)
In setting mode, press this key to
change the setting content. Under
recall mode, press this key to read
memories.
C
Fig.A Fig.B
5-1.HLD/REC :
In normal mode, press the key < 1 sec.
To hold the current reading, then
quickly press the key again to unlock
it. In normal mode, press the key
more than 2 seconds to enter recall
mode. (Fig. C, page 6)
5
Press HLD+ENTER for the backlight.
The backlight will turn off automatically
after 10 seconds.
CON
uS
Fig. C
REC
Y-M-D
o
C
6-1.
MI/MX/AV key:
In normal and recall mode, press this
key to view Max./Min./Avg. readings.
In normal mode, press key > 2 sec. to
clear the value. The entire LCD will
flash for 2 seconds.
In setting mode, press this key to
enter content setting.
7. SET + :
When the meter is off, pressing these
two keys simultaneously for more than
one second disables auto-off mode.
AUTO POWER OFF
The meter will auto-powered off in
20 minutes after last key press.
This function saves battery power.
To override this function, press POWER
and UP keys at the same time until "n"
is displayed. Release the keys and
meter will enter
normal mode.
6
RECALL MODE
In the normal mode, press more
HLDHLD
RecRec
than 2 seconds to enter RECALL (REC)
mode. Press MIN/MAX/AV to view
Maximum, Minimum and Average of the
memorized data ( Fig. D). You
could also press or to review
MODEMODE
MEMMEM
the memories one by one.
"REC" is flashing in recall mode. To exit
recall mode, press more than 2 sec.
Quickly press to return to normal
mode. LCD will show the last memory
CALCAL
Es cEs c
HLDHLD
RecRec
count saved before you entered recall
mode.
CON
MIN
REC
uS
o
C
Fig. D
Press MX/MN/AV key w
hen REC is
flashing, so that the MAX value of the
all memories will diaplay. Press
MX/MN/AV key again to view MIN.
Press again to view Average. The top
right corner record number will not be
displayed while viewing MX/MN/AV.
REVIEW MODE
NN
/AV/AV
XX
In normal mode, press key < 1sec.
MM
to view MAX, MIN, AVG. These values
are cleared when the meter is turned off.
You can press the key > 2 second
NN
/AV/AV
XX
MM
to clear these values (LCD will flash for
2 seconds). Note: Clear the values when
the measurement is stable.
7
PREPARATION FOR CALIBRATION
Two issues should be considered
before operation:
What is the right calibration standard?
When should you calibrate?
Selecting a calibration standard
For best results, select a conductivity,
TDS or NaCl standard near the
sample value you are measuring.
Alternatively, use a calibration solution
value which is approximately 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.
Refer to below table.
Use the recommended solution for
different conductivity and TDS ranges
for best results.
Conductivity
measuring range
0~19.99uS
1
0~199.9uS
2
0~1999uS
3
4
0~19.99mS
0~199.9mS
5
Recommended cal.
solution range
6.00~17.00uS
60.0~170.0uS
600~1700uS
6.00~17.00mS
60.0~170.0mS
TDS measuring
range (factor=0.5)
0.00~9.99ppm
1
0.0~99.9ppm
2
0~999ppm
3
0.00~9.99ppt
4
0.0~199.9ppt
5
Recommended cal.
solution range
3.00~8.50ppm
30.0~85.0ppm
300~850ppm
3.00~8.50ppt
30.0~85.0ppt
8
This meter has a built-in algorithm
to linearize the measurement of
Sodium Chloride concentration.
For SALT calibration, you only need
to perform one-point calibration.
The previous calibration data will be
replaced after re-calibrating. For
example, if you previously calibrated the
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.
If you use solution to calibrate one range
and then manually input the cell constant
(P5.2), the cell constant of range 1
to 5 will be changed simultaneously.
.
NOTE:
The temperature coefficient of the meter
defaults to 2.1% per C (Fig. E) and
o
provides good results for most
applications. See Program P4.1
on page 27 to reset the coefficient.
Alternatively, refer to Appendix D to
calculate the temperature coefficient
and determine the appropriate
temperature coefficient for solution.
o
C
Fig. E
NOTE:
The default normalization temperature
value is 25°C.
9
To normalize to another value, see
K=0.966
P4.2 on page 28 (Fig. F). Before
resetting this value,
the calibration
standard value of the normalized temp.
must be known. (Refer to the datasheet
enclosed with
your solution.)
o
C
Fig .F
When should you do the calibration?
For first useand for best results,
use solution to calibrate or
manually input the cell constant
if
solution is not readily available.
(refer to the label on the probe).
NOTE: The cell constant has
been programmed into meter.
To completely calibrate the meter,
clear all previous calibration data,
(to erase all calibration data,
see P7.1 on page 32 (Fig. G)).
K=
0.966
Fig .G (8306)
Cell Constant
If the conductivity of measured solutions
are < 100 S, or TDS are < 50 ppm,
calibrate the meter at least once
a week for accuracy.
If the meter is used in the mid ranges,
it is needed to do calibration at least
once a month.
If the measurement is performed at
extreme temperatures, calibrate at
least once a week.
10
CONDUCTIVITY CALIBRATION
Follow the below steps for
conductivity calibration:
Insert the probe into demineralized
1.
water or distilled water for about 30
minutes to rinse the probe.
Select the conductivity standard for
2.
calibration. ( See page 8)
Pour 4 cm (deep) of the solution into
3.
two separate clean containers(A&B).
Turn on the meter, the entire display
4.
flashes three times and then returns
to the normal measurement mode.
5.Rinse the probe in 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.
66
K=0.966
K=0.9
4cm
A(Step 5)
4cm
B( Step 6)
7.Press CAL key more than2 seconds to
enter calibration mode. The probe
auomatically detects the conductivity
value of solution and blinks the value
on the LCD (Fig. H)
CON
uS
READY
H:M:S
o
C
Fig .H
11
8. Press the UP/DOWN keys to change
the value on the primary display to
match the value to the standard
( normalization temp. is 25°C).
Adjust the conductivity reading
up to +20% from the detected
value. However, if the detected value
and standard value differ by more
than +20%, clean or replace the
probe.
Example:
Standard: 10uS; Detected value:19uS
Adjustable range: +3.8us (19*20%)
However, under above situation, the
values already differed over 20%.
NOTE:
* When the calibration is stable,
"Ready" will display. If not,
check that the calibration solutions
aand the input value (step 8) are
correct.
* Cell constant may degrade with time
and usage. Use this feature
as a reminder for changing to a new
probe.
* The meter will automatically detect
the solution, If the standard value is
over the measuring limit or less than
10% of measuring
value will equal the range limit or
10% of range limit. Under this situation,
go to parameter settings first to
manually select a suitable
range. (P1.0, see page 23).
Example 1:
Standard: 22uS; Detected value:19uS
Adjustable range: +3.8us (19*20%)
Although the values differ less than
limit, the displayed
12
20% but the 22uS is already over
range limit so the maximum value
could be input is 19.99uS only.
To exactly adjust the value to 22uS,
please manual select the range as
0~199.9 in P1.3
Example 2:
Standard: 1.6uS; Detected value:2.1uS
Adjustable range: +0.42us (2.1*20%)
Although the values differ less than
20% but the 1.6uS is already less than
10% range limit (1.99) so the max.
value that could be input is 1.99uS.
9.After "Ready" is displayed, press
"ENTER" to confirm the calibration.
The LCD will stop flashing and the
meter will switch back to normal
measurement mode.
10.Repeat 1~9 for other ranges.
NOTE:
* When switching the meter from
measurment to calibration mode, the
meter will auto defect the solution
value based on the previously selected
cell constant (0.1,1.0 or 10), so,
sometimes the primary display
may seem to jump to the auto defected
value after entering calibration. This
means that even in the same solution,
it is normal for the displayed values
in measurment and calibration mode s
to be different.
* To exit conductivity calibration mode
without confirming calibration, DO
NOT press the ENTER key in step 9.
Press Esc to retain the meter's
previous calibration data for the
current range.
13
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