JENCO 6308CST User manual
Operation Manual
MODEL 6308CST
Conductivity/Salinity/Temperature
Transmitter/Controller
6308CST
1
CONTENTS
GENERAL INTRODUCTION......................................................................................... 2
ASSEMBLY...................................................................................................................2
A. Mounting Procedure............................................................................................2
B. Cleaning The Meter..............................................................................................3
DISPLAY & KEY FUNCTIONS..................................................................................... 3
A. Display................................................................................................................3
B. Operational Keys Description............................................................................... 4
REAR CONNECTORS..................................................................................................5
TURNING ON/OFF THE METER.................................................................................. 6
MODEL 6308CST MODES............................................................................................6
A. Measure Mode.....................................................................................................6
B. Calibration/Setting Mode...................................................................................... 8
1. Password check page.................................................................................... 9
2. User setting page........................................................................................... 9
3. Conductivity calibration page.......................................................................1 0
4. Conductivity (or salinity) control settings page.......................................... 12
5. Current out page..........................................................................................13
6. Temp./RS485/password settings page.......................................................... 13
CONTROLLING THE RELAYS...................................................................................14
A. Isolation Voltage................................................................................................14
B. Output Load.......................................................................................................14
C. Relay Action, Relay Setpoint& Hysteresis Value................................................. 14
D. Conductivity/Salinity Relays...............................................................................15
E. Temperature Relays...........................................................................................15
4 - 20 mA OUTPUT.....................................................................................................15
A. Isolation Voltage................................................................................................15
B. Output Load.......................................................................................................16
C. Conductivity/Salinity Linear Output.................................................................... 16
RS485 INTERFACE OPERATION..............................................................................16
A. Introduction.......................................................................................................16
B. Preparing The Meter...........................................................................................17
PROBE HANDLING AND MAINTENANCE................................................................ 17
A. Handling The Probe...........................................................................................17
B. Storing The Probe..............................................................................................17
ERROR DISPLAYS AND TROUBLESHOOTING.......................................................18
SPECIFICATIONS...................................................................................................... 18
WARRANTY............................................................................................................... 20
2
GENERAL INTRODUCTION
The Jenco model 6308CST (Conductivity, Salinity and Temperature) system is a rugged
microprocessor based meter assembled in a watertight ¼ DIN case, designed for use in
laboratories and process control applications.
The model 6308CST microprocessor allows the user to easily recalibrate the parameters for the
probes. The conductivity system requires only a single calibration. The microprocessor also
performs a self-diagnostic routine every time you turn on the unit providing you with basic
information about the stability of the meter.
The system simultaneously displays conductivity, salinity, temperature, cell constant, relay
status and mA output in one graphic LCD screen. The LCD also includes a backlight for low-lit
environments. This system uses a four-wire type probe for the conductivity and a precise
thermistor for temperature, providing you with accurate readings for all your measurements.
The model 6308CST is equipped with three relays: two programmable high/low control relays for
conductivity/Salinity and one programmable high/low control relay for temperature. All relays are
hysteresis driven and configurable to EDGE mode. The system also has an isolated 4-20 mA
analog output, offset and span configurable for conductivity/salinity display.
The model 6308CST is using the standard RS485 MODBUS RTU protocol, which can easily let
the user log all data (from multiple model 6308 or 6309) with an PC.
ASSEMBLY
Carefully unpack the meter 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.
A. MOUNTING PROCEDURE
1. Make a cutout on any panel,
with a thickness of 1/16 in.
(1.5 mm) to 3/8 in. (9.5mm).
2. Remove the mounting
assembly from the controller
and insert the controller into
the cutout.
3. Replace the mounting bracket
assembly onto the controller
and secure the controller to
the mounting panel.
3.66"
0.04
0.00
93.00mm
1.00
0.00
93.00mm
3.66"
0.00
0.00
1.00
0.04
0.04"R(1.0mm) MAX.
PANEL CUTOUT DIMENSIONS
3
Warning: If the equipment is used in a manner not specified by the manufacturer, the
protection provided by the equipment may be impaired.
B. Cleaning The Meter
1. Be sure to remove the power before attempting to clean the meter.
2. Use a lint free cloth and clean water or neutral detergent.
3. Wipe the outer surface of the meter only.
4. Wipe-dry the meter before powering again.
DISPLAY & KEY FUNCTIONS
A. Display
Figure 1
1. CELL CONSTANT-
Actual cell constant of the probe computed
from the last cell constant calibration.
2. CURRENT OUT-
This will display the actual output of the
isolated 4-20 mA output.
3.
-
This will be displayed if Calibration/Setting
pages are password locked meaning the
user can’t change the values unless the
correct 4 digit number has been entered.
4. H1 or L1-
This is the status of conductivity/salinity
RELAY 1, if this is displayed then the relay
is ON. (H stands for high action control and
L stands for low action control).
5. H2 or L2-
This is the status of conductivity/salinity
RELAY 2, if this is displayed then the relay
is ON.
6. H3 or L3-
This is the status of the temperature
RELAY 3, if this is displayed then the relay
is ON.
7. Conductivity or Salinity display.
8. Temperature display.
4
B. Operational Keys Description
Figure 2
NO.
Key
Description
1
MODE-
In the measure mode, pressing this key will change the display to conductivity
or salinity.
In the Calibration/Setting mode, pressing this key will move to the next digit of
the current active parameter.
In the Calibration/Setting mode, pressing this key for two seconds will move the
user back to the previous parameter.
2
CAL/VIEW-
Pressing this key for about two seconds, during normal display mode will switch
to Calibration/Setting mode.
During Calibration/Setting mode, pressing this key will switch to the next
available Calibration/Setting page. Pressing this key at the last User/Calibration
page will return the user to the normal display mode.
3
UP-
During Calibration/Setting mode, pressing this key will increment the current
blinking digit of the active parameter.
4
DOWN-
During Calibration/Setting mode, pressing this key will decrement the current
blinking digit of the active parameter.
5
ENTER-
During Calibration/Setting mode, pressing this key will save the current
modified parameter and move to the next parameter.
5
6
LIGHT-
Pressing this key will turn on or turn off the backlight of the LCD.
The backlight will automatically turn off if there is no key activity within two
minutes.
REAR CONNECTORS
Figure 3
For wiring the probes, relays, analog output, RS485 and power cord, please see proper wiring
instructions indicated below. Be sure the AC plug is not plugged-in. Remember that the unit is
ON once the user plugs in the power cord to an AC power supply.
1. Connect the AC line to the rear of the meter. The model 6308CST can be used with 115 or
230 VAC 50/60 Hz. Power consumption is 6 watts. Make sure the EARTH connector is
connected to the earth lead of the AC power line.
2. Connect the proper load to the output relays. Make sure that the load does not exceed
the relay rating, 5 Amp at 115 VAC and 2.5 Amp at 230 VAC.
3. Set the proper load to the 4-20 mA-output connector. Make sure that the load impedance
is less than 500 Ohms.
[Note: MAKE SURE YOU CONNECT THE AC POWER CORD TO THE CORRECT AC
TERMINALS. CONNECTING INCORRECTLY MAY DAMAGE THE UNIT
PERMANENTLY.]
6
TURNING ON/OFF THE METER
By just plugging the unit to a correct AC voltage, the unit will be ready for use. There is no
Power key so unplugging and plugging the unit will turn OFF or turn ON the unit respectively.
After the unit is turned on, it will perform some basic self-diagnostics and will display “OK” or
“BAD”. If you received any “BAD” messages turn OFF the unit and turn it ON again. (See
ERROR DISPLAYS AND TROUBLESHOOTING).
If the message persists then you might need to call your Jenco distributor. (See WARRANTY)
After the self-diagnostic is completed, the temperature reading will be shown on the lowest part
of the screen and the user is ready to make conductivity or salinity measurements.
MODEL 6308CST MODES
A. Measure Mode
Turning ON the unit will always display in the conductivity measure mode.
This meter is designed to provide 3 distinct measurements:
1. Temperature
Current temperature of the solution, which is always displayed.
7
2. Compensated Conductivity
A conductivity reading adjusted to a calculated value which would have been read if the
sample had been at the user reference temperature.
The conductivity of solutions of ionic species is highly dependent on temperature, varying
as much as 3% for each change of 1°C (Temperature Coefficient (TC) = 3%/°C). In
addition, the temperature coefficient itself varies with the nature of the ionic species
present.
Because the exact composition of a natural media is usually not known, it is best to report
a conductivity at a particular temperature, e.g. 10.2 mS/cm at 15 °C. However in many
cases, it is also useful to compensate for the temperature dependence in order to
determine the measurement at a glance if gross changes are occurring in the ionic content
of the medium over time. For this reason, the model 6308CST allows the user to output
conductivity in either raw or compensated form. If the user Temperature Coefficient (TC) is
set to 0.00% then an uncompensated conductivity is output to the screen. If the TC is
not zero then the model 6308CST uses the temperature, TC, raw conductivity and the
reference temperature to display the compensated conductivity.
The calculation is carried out as in the equation below:
Compensated conductivity = conductivity/(1+TC*(T- RT))
Where: TC = Temperature Coefficient
T = Solution temperature
RT =Reference Temperature
3. Salinity
Salinity is the ratio of the mass of dissolved matter to the mass of solution. This is
expressed in ppt (parts per thousand).
Temperature and conductivity (or salinity) are always simultaneously displayed in the
graphic LCD screen in measure mode. The user can select conductivity or salinity reading
by pressing the “MODE” key in measure mode.
8
B. Calibration/Setting Mode
Pressing the “CAL/VIEW” key for about two seconds during the measure mode will bring-
up the first page of six pages of the Calibration/Setting mode. Pressing “CAL/VIEW” key
will switch to the next page. At the last page, press “CAL/VIEW” key again will return the
user to measure mode.
Below is a simple flowchart showing the path of the “CAL/VIEW” key:
The user can change any blinking words or digit by pressing the “UP” or “DOWN” keys.
For options in digit format, the user needs to press the “MODE” key to move to the next
digit. If the user is satisfied with the selection made, press the “ENTER” key to save the
changes and move to the next option. If the user does not need to change the current
blinking option just press the “ENTER” key to move to the next selection.
9
1. Password check page
a. Screen illustration
The user will only see this page if the unit is password locked.
To change any settings or calibration, the user needs to unlock the system to remove the
“PASSWORD LOCKED” message by entering the correct 4-digit password.
The user can still view all the pages of Calibration/Setting mode if the system is
password locked by just pressing the “CAL/VIEW” key on this page. If the unit is
“PASSWORD LOCKED”, going to Calibration/Setting mode will not affect the function
of the relays.
[Note: If the unit is not locked then every time the user enters the Calibration/Setting
mode the relays and analog out will be frozen.]
2. User setting page
a. Screen illustration
The user will only see this page if the unit is not password locked. This page is just a
warning, telling the user that all relays are frozen and that the user can calibrate and
change the settings.
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