JENCO 6350M Manuel utilisateur
OPERATION MANUAL
JENCO MODEL 6350M
MICROCOMPUTER BASED
pH/mV/Conductivity/
Salinity/Temperature
PORTABLE METER
JENCO ELECTRONICS,LTD.
MANUFACTURER OF PRECISION INSTRUMENTS
1
CONTENTS
Page
I. INITIAL INSPECTION 2
II. GENERAL INTRODUCTION 2
III. USING THE JENCO MODEL 6350M 3
A. PRECAUTIONS 3
B. THE KEYPAD 4
C. SPECIAL KEY COMBINATION 6
D. THE DISPLAY 6
E. CONNECTORS 7
F. REPLACING THE BATTERIES 8
G. TURNING OFF/ON THE INSTRUMENT 8
IV. MODEL 6350M MODES 9
V. AUTO/MANUAL RANGING IN CONDUCTIVITY 11
A. AUTORANGING 11
B. MANUAL RANGING 12
VI. AUTOMATIC AND MANUAL TEMPERATURE 12
A. AUTOMATIC TEMPERATURE COMPENSATION 12
B. MANUAL TEMPERATURE COMPENSATION 13
VII. CALIBRATION SET-UP 13
A. STAND AND SLOPE CALIBRATION 13
B. TEMPERATURE COEFFICIENT 15
C. TEMPERATURE REFERENCE 15
D. CELL CONSTANT CALIBRATION 16
VIII. SAVING AND RECALLING DATA 17
A. SAVINGS READINGS TO MEMORY 17
B. RECALLING READINGS FROM MEMORY 18
C.ERASINGDATA 18
IX. RS232C INTERFACE OPERATION 19
A. INTRODUCTION 19
B. PREPARING THE METER 19
C.SOFTWARE 19
X. ERROR DISPLAYS AND TROUBLESHOOTING 20
XI. SPECIFICATIONS 22
XII.pHBUFFERS 24
XIII. PREPARING STANDARD SOLUTIONS 25
XIV.WARRANTY 26
2
I. INITIAL INSPECTION
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.
II. GENERAL INTRODUCTION
The Jenco Model 6350M Handheld pH, mV, Conductivity, Salinity
and Temperature System, is a rugged microprocessor based
instrument designed for use in field laboratories and process control
applications. Using a four-electrode cell for conductivity and a
glass electrode for the pH probe, it becomes an essential tool for
precise measurements of conductivity, pH, salinity, mV and
temperature.
The model 6350M microprocessor allows the user to easily
recalibrate the parameters for the probe. A few keystrokes will
adjust all the parameters for compensated, uncompensated
conductivity and pH and will also give the user the option to select
two types of probe cell constant for a better selection of available
probes and applications. The microprocessor also performs a self-
diagnostic routine every time you turn on the unit providing you
with basic information about the current cell constant and stability
of the instrument.
The system simultaneously displays temperature in °C along with
either Compensated Conductivity, Uncompensated Conductivity,
Salinity, pH or mV. The user can switch back and forth from all
these displays by just pushing a single key.
The model 6350M is also equipped with a non-volatile memory
allowing the user to store 50 different sets of readings. This model
3
6350M will also assign a site number for each set of readings to let
the user an easy review of the data.
This instrument is powered by six AAA-size alkaline batteries or a
UL/CE approved AC adapter. The instrument also displays a "LO
BAT" message when the batteries are in need of replacement.
The model 6350M comes with a RS232C interface which can easily
let the user log all data simultaneously or download the stored 50
sites in a RS232 equipped personal computer.
This instrument is also splash proof and CE approved making it a
versatile tool for conductivity/salinity/pH/mV and temperature
applications.
III. USING THE JENCO MODEL 6350M
A. PRECAUTIONS
The Model 6350M case is SPLASH
PROOF in a watertight case. But the
instrument should not be used under
water since the instrument and the
whole cable of the probes are not
WATERPROOF. The SPLASH PROOF
feature is to prevent permanent damage
to the instrument when accidentally
splashed with non-corrosive solutions.
(1) - LCD
(2) - RS232 connector
(3) - Keypad
Take the following measures immediately in the event that the
instrument is dampened in any kind of solution.
1. Place all the rubber caps tightly in all the instrument's connector
holes then carefully rinse the instrument with distilled water.
JENCO
STAND SLOPE
ON/OFF MODE
C
LO BAT
T
STAND
SLOPE
MAN
AUTO
WAIT
CAL
6350
pH/COND./TEMP METER
CAL
pH
ppt
uS
mS
mV
ENTER
1
2
3
Figure 1- (front view)
4
After rinsing and drying, the connectors should be inspected and
cleaned to remove all contaminants that might affect the probe
connections.
2.Wait for the instrument and probe to be completely dry before
resuming operation.
3. If unsatisfactory results are gained after doing the above, notify
your Jenco representative for possible repair or replacement (See
WARRANTY).
B. THE KEYPAD
1 2
↓↓
←3
8→←4
↑↑↑
7 6 5
1. The [ ON/OFF ] key.
This key will turn on or turn off the instrument. The last
display mode will be saved, except during calibration, recall
and erase mode where it will default to pH display.
2. The [ MODE ] key.
2a. In normal operation this key will change the display to
pH, mV, Conductivity, compensated Conductivity, Salinity,
Recall and Erase mode.
2b. In Calibration mode this key will exit the current
calibration and go to the next calibration parameter.
3. The [ CAL ] key.
3a. During any conductivity mode this key will enable CELL
CONSTANT Calibration.
ON/OFF MODE
STAND SLOPE
CAL ENTER
Figure 2
5
3b. In pH mode this key will enable pH calibration. See
CALIBRATION SET-UP.
4. The [ ∆] key.
4a. During pH readings (ONLY) this key will increment the
temperature in the event the unit detects no temperature
input. (see MANUAL TEMPERATURE COMPENSATION)
4b. This key is used to increment/change the Conductivity
calibration, Temperature coefficient and Temperature
Reference.
4c. During Conductivity and compensated Conductivity
operation this key will change the display from auto ranging
to manual ranging. (see AUTO/MANUAL RANGING IN
CONDUCTIVITY)
4d. In Recall mode this will move to a lower (older) site
number.
5. The [ ∇] key.
5a. During pH readings (ONLY) this key will decrement the
temperature in the event the unit detects no temperature
input. ( see MANUAL TEMPERATURE COMPENSATION)
5b. This key is used to decrement/change the Conductivity
calibration, Temperature coefficient and Temperature
Reference.
5c. In Recall mode this will move to higher (newer) site
number. Moving the site number will in no way change in
which site the next data will be saved. It will always save in
the next open site number.
6. The [ ENTER ] key.
6a. During normal operation pressing this key for about 2
seconds will save all the readings in the next available site
number.
6b. During RECALL mode this key will display the saved
data in the current site. Pressing this key again will display
the 2nd data on the current site and so on.
6
6c. During CONDUCTIVITY CALIBRATION or
PARAMETER setting mode this key will save the current
value of the displayed parameter.
7. The [ SLOPE ] key.
Pressing this key at normal pH display for about 5 sec. will
toggle the buffer set for calibration. The unit will
acknowledge by displaying “7.00” for (7.00,4.01,10.01) and
“6.86” for (6.86,4.00 & 9.18).
During pH calibration this key will initiate the calibration of
the pH slope only if the STAND is calibrated.
8. The [ STAND ] key.
During pH calibration this key will initiate the calibration of
the OFFSET of the pH electrode.
C. SPECIAL KEY COMBINATIONS
A. [ ∇] and [MODE] keys.
Pressing this combination in any conductivity mode will
enable Temperature coefficient and Temperature reference
set-up. (See CALIBRATION SET-UP.)
B. [ ∇] and [ENTER] keys.
Pressing this combination during Erase mode for about 5
seconds will erase ALL data in the non-volatile memory.
Data in all 50 sites will be erased completely. Do not use the
erase function until all recorded data has been reviewed or
transcribed/downloaded outside the model 6350M. ( SEE
SAVING AND RECALLING DATA.)
D. THE DISPLAY
mV
mS
uS
ppt
pH
CAL
WAIT
AUTO
MAN
SLOPE
STAND
LO BAT
C
1
2
3
4
5
6
7
8
Figure 3
7
1. "LO BAT" -Low battery indicator.
2."RC"- to indicate that the unit is in recall mode and actively
displaying saved data.
3. MAIN DISPLAY (pH, mV, Conductivity & Salinity)
4. "MAN" - used to indicate that a temperature sensor is not
attached and the pH temperature compensation is manual.
"AUTO" - used to indicate that a temperature sensor is attached.
"WAIT" -used when in pH calibration to indicate that the reading
is not yet stable.
"CAL" - used to indicate that unit is in calibration mode.
5."STAND" & "SLOPE" ANNUNCIATORS - during
calibration this will indicate which part of pH is being
calibrated, in normal operation this will indicate (blinking) which
part of pH is not yet calibrated.
6.MAIN (MODE) DISPLAY UNITS -mS/uS units will blink if you
are in manual range. (see AUTO/MANUAL RANGING)
7.SECONDARY DISPLAY (Temperature and Site number)
8.TEMPERATURE UNIT
In Uncompensated Conductivity mode, the temperature unit will
not blink.
In Compensated Conductivity mode, the temperature unit will
blink.
E. CONNECTORS 1. pH electrode input
2. pH REF. input
3. COND/TEMP probe input
4. AC adaptor input
5. Probe holder
6. RS232 connector
Figure 4- (top view)
6
54321
8
F. REPLACING THE BATTERIES
1. Position the meter so that the bottom part of the meter is facing
up . (Refer to figure 5.) Insert a coin in the side closure slot. Tilt
the coin and thrust it upward to open the battery compartment
and lift the closure up.
2. Remove all of the old batteries and insert a new set of batteries
ensuring the polarities are correct.
G. TURNING ON/OFF THE INSTRUMENT
Once the batteries are installed correctly and/or an AC adapter is
installed and plugged in the unit will turn ON at once. Pressing the
[ON/OFF] key will turn on or turn off the instrument. When the
unit is not in use the user should turn off the instrument to save
battery life. By just unplugging the AC adapter will not turn off the
instrument if batteries are present. It would automatically switch to
battery power and will continue to operate.
Figure 5
AAAbattery
BatteryCover
SIDE CLOSURE SLOT
9
After the unit is turned on the unit will display all segments for a
few seconds then it will display the current cell constant. If the
instrument detects a internal problem it will display an error
message for a few seconds. You can learn about these error
messages by consulting the ERROR DISPLAYS of this manual.
After the self-diagnostic is complete the temperature will be
displayed in the lower right of the display and the instrument is
ready to make a measurement. Just immerse the probe half-way to
the liquid. If possible do not allow the probe to touch any solid
object in the solution. There should be no air bubbles around the
probe either. Shaking or moving the probe vigorously before
recording any measurement will dislodge any bubbles formed in
the probes.
IV. MODEL 6350M MODES
This instrument is designed to provide 6 distinct measurements and
2 special modes:
1. Temperature - current temperature of the solution which is
always displayed. If the temperature probe is not available then
a user selectable temperature will be used.
2. pH - the current degree of acidity or alkalinity of the solution
with automatic temperature compensation. If a temperature
probe
is not attached a user selectable temperature will be used.
3. mV - the millivolt value of the pH electrode.
IF THE PROBE /INSTRUMENT IS NEW, A CELL CONSTANT
CALIBRATION MUST BE PERFORMED BEFORE USE, SINCE
THE CELL CONSTANT IS SLIGHTLY DIFFERENT FOR EACH
CONDUCTIVITY PROBE. REFER TO CALIBRATION SET-UP
FOR PROCEDURES.
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