JENCO 6308CT Manuale utente

OPERATION MANUAL

JENCO MODEL 6308CT

MICROCOMPUTER BASED

Conductivity/TDS & Temperature

CONTROLLER

JENCO ELECTRONICS,LTD.

MANUFACTURER OF PRECISION INSTRUMENTS

CONTENTS page

I. INITIAL INSPECTION and ASSEMBLY 2

MOUNTING PROCEDURE 2

II. GENERAL INTRODUCTION 4

III. USING THE JENCO MODEL 6308CT 5

A.FRONT PANEL 5

B.NORMAL MODE DISPLAY 6

C.REAR CONNECTORS 7

D.TURNING ON/OFF THE INSTRUMENT 8

PROBE HANDLING AND MAINTANCE 9

IV. MODEL 6308CT MODES 10

A. NORMAL MODE 10

B. CALIBRATION/SETTING MODE 13

a.PASSWORD CHECK PAGE 14

b.USER SETTING PAGE 15

c.CONDUCTIVITY CALIBRATION PAGE 15

d.CONDUCTIVITY CONTROL SETTING PAGE 18

e.CURRENT SETTING PAGE 19

f.TEMP. CONTROL SETTING PAGE 20

V. CONTROLLING THE RELAYS 21

A. ISOLATION VOLTAGE 21

B. OUTPUT LOAD 21

C. RELAY ACTION, SETPOINT, HYSTERESIS

MODE & HYSTERESIS VALUE 21

D.CONDUCTIVITY/TDS RELAYS 22

E.TEMPERATURE RELAY 23

VI. 4-20 mA OUTPUT 23

A.ISOLATION VOLTAGE 23

B.OUTPUT LOAD 23

C.CONDUCTIVITY OR TDS LINEAR OUTPUT 23

VII. RS485 INTERFACE OPERATION 25

A.INTRODUCTION 25

B.PREPARING THE METER 25

VIII.ERROR DISPLAYS AND TROUBLESHOOTING 26

IX. SPECIFICATION 27

X. WARRANTY 29

I. INITIAL INSPECTION and ASSEMBLY

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.

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.

Warning:

If the equipment is used in a manner not specified by the

manufacturer, the protection provided by the equipment may be

impaired.

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

Cleaning the instrument:

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 instrument only.

4. Wipe-dry the instrument before powering again.

II. GENERAL INTRODUCTION

The Jenco Model 6308CT (Conductivity and Temperature) System,

is a rugged microprocessor based instrument assembled in a

watertight ¼ DIN case, designed for use in laboratories and process

control applications.

The model 6308CT 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 instrument.

The system simultaneously displays Conductivity, Temperature,

cell constant or TDS factor, relay status and mA output in one LCD

graphic screen. This system uses a two-wire or four-wire type

sensor for the conductivity and a precise thermistor for

temperature, providing you with accurate readings for all your

measurements.

The model 6308CT is equipped with three relays: two

programmable High/Low control relays for conductivity/TDS and

one programmable High/Low control relay for temperature. All

relays are hysteresis driven and configurable to CENTER or EDGE

mode. The system also has an isolated 4-20mA analog output, offset

and span configurable for Conductivity/TDS display.

The model 6308CT comes with a RS485 interface which can easily

let the user log all data (from multiple model 6308 or 6309) with

an IBM©PC/AT compatible computer. For advanced users, the

model 6308CT may also be remotely controlled from main display

mode to all calibration/setting modes.

III. USING THE JENCO MODEL 6308CT

A. FRONT PANEL

1. The [MODE/-] key.

1a. In Normal mode this key

will change the display to

Conductivityor TDS.

1b. In Calibration/Setting

mode this key will move

to the next digit of the

current active parameter.

1c. In Calibration/Setting

mode pressing this key for

2 seconds. will move you

back to the previous

parameter. Pressing this

key for 2 seconds at the

first parameter of the page

will move you back to last parameter of the previous page.

2. The [CAL/VIEW] key.

2a. During any normal mode, pressing this key for about 2 secs

will switch to the first Calibration/Setting screen.

2b. During Calibration/Setting mode this key will switch to the

next available Calibration/Setting page pressing this key at

the last User/Calibration page(TEMP. CONTROL SETTING

page) will return the user to the Normal mode.

3. The [ ] UP key.

During Calibration/Setting mode this key will increment the

current blinking digit of the active parameter.

4. The [ ] DOWN key.

During Calibration/Setting mode this key will decrement the

blinking digit of the active parameter.

MODE CAL.

VIEW

CURSOR

JENCO

6308CT

5. The [ ] ENTER key.

During Calibration/Setting mode this key will save the

current modified parameter and move to the next parameter

on the page if the parameter is the last one on the page then it

will move to first parameter on the next available page.

6. The [ ] LIGHT key.

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.

7. LCD screen.

B. NORMAL MODE DISPLAY

1. CELL or TDS F– Actual

cell constant of the

probe computed from

the last cell constant

calibration. In TDS

display it will show the

TDS factor instead of

the cell constant.

2. CURRENT OUT - this

will display the actual

output of the isolated 4-20 mA output. At POWER-ON this will

show “OFF” for about 3 seconds before going to normal

operation. After going to the Calibration/Setting pages when the

unit is not password locked this will show ”FROZEN” for about

3 seconds before returning to normal operation.

3. ( )key icon annunciator - This will be displayed if the

Calibration /Setting pages are locked, meaning the user will

not be able to change the values unless the correct 4 digit

number has been entered at the PASSWORD CHECK page.

4. H1 or L1 annunciator - this is the status of Conductivity/TDS

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 annunciator – this is the status of Conductivity/TDS

Relay 2, if this is displayed then the relay is ON.

6. H3 or L3 annunciator – this is the status of the Temperature

Relay 3, if this is displayed then the Relay is ON.

7. TC- User selected temperature coefficient of the conductivity/

TDS solution.

8. Conductivity or TDS display.

9. Temperature display.

C. REAR CONNECTORS

Before wiring the probes, relays, analog output, RS485 and power

cord be sure that you are connecting to the right terminal as shown

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 instrument. The model

6308CT 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 4-20mA output connector. Make sure

that the load impedance is less than 500 Ohms.

4. If the user uses a two-wire conductivity probe, the user needs to

short terminal D1 with terminal S1 and terminal D2 with terminal

S2.

CAUTION: Make sure you connect the AC power cord to the

correct AC terminals. Connecting incorrectly may damage the unit

permanently.

D. TURNING ON/OFF THE INSTRUMENT

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 VI. ERROR DISPLAYS AND TROUBLESHOOTING ).

If the message persists then you might need to call your distributor.

(See X. WARRANTY).

After the self-diagnostic is complete the temperature will be

displayed on the lowest part of the screen and you are ready to

make conductivity or TDS measurements. Just immerse the probes

halfway to the liquid. If possible do not allow the probes to touch

any solid object in the solution. There should be no air bubbles

around the probes either. Shaking or moving the probes vigorously

before recording any measurement will dislodge any bubbles

formed in the probes.

PROBE HANDLING AND MAINTENANCE

REMINDER: If the user uses a two-wire conductivity probe, the

user needs to short terminal D1 with terminal S1 and terminal D2

with terminal S2.

Handling the probe

To ensure accurate and repeatable results:

1. The probe (cell) must be clean before making any measurements.

If measuring low conductivity solutions, extra ordinary

cleanliness may be necessary.

2. The probe cell plates must totally submerged in the solution.

The electrode chamber must be free of trapped air or particulates.

You may need to tap the probe gently to dislodge any air bubbles.

3. Ideally, the probe should be at least 1/4 inch away from any

object, including the sides and bottom of the container.

4. Stirring may be necessary for high accuracy readings.

5. If possible, isolate the solution container from ground potentials.

6. Electrical fields and stray currents caused by stirrer motors,

heaters, etc., can interfere with the measurements. The user

should determine the effects of these and make the necessary

corrections either by shielding or by disconnecting those units

that cause trouble.

7.Always rinse the cell carefully before using it in another solution.

8. Never store a dirty or contaminated probe.

Indice

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