JENCO 6308PT Bedienungsanleitung

OPERATION MANUAL

JENCO MODEL 6308PT

MICROCOMPUTER BASED

pH/ Temperature

CONTROLLER

JENCO ELECTRONICS, LTD.

MANUFACTURER OF PRECISION INSTRUMENTS

CONTENTS

Page

I. GENERAL INTRODUCTION 3

II. INITIAL INSPECTION and ASSEMBLY 4

MOUNTING PROCEDURES 4

III.USING THE JENCO MODEL 6308 PT 5

A. FRONT(KEYPAD) PANEL 5

B. MAIN DISPLAY MODE 6

C. REAR CONNECTORS 8

D. TURNING ON/OFF THE INSTRUMENT 9

IV. MODEL 6308 PDT MODES 10

A. MAIN DISPLAY MODE

B. CALIBRATION/SETTING MODE 11

a. CHECK PASSWORD page 12

b. USER SETTING page 12

c. pH CALIBRATION page 13

d. pH CONTROL SETTING page 15

e. CURRENT SETTING page 16

f. TEMP. CONTROL SETTING page 16

V. CONTROLLING THE RELAYS 17

A. ISOLATION VOLTAGE 17

B. OUTPUT LOAD 17

C. RELAY ACTION,SET POINT &HYSTERESIS 18

D. pH RELAYS 19

VI. 4-20 mA OUTPUT 19

A. ISOLATION VOLTAGE 19

B. OUTPUT LOAD 19

C. pH LINEAR OUTPUT 20

D. pH ANTILOG OUTPUT 21

VII. RS485 INTERFACE OPERATION 22

A. INSTRUCTION 22

B. PREPARING THE METER 22

VIII.ERROR DISPLAYS AND TROUBLESHOOTING 23

IX. pH BUFFERS 25

X. SPECIFICATIONS 26

XI. WARRANTY 27

I. GENERAL INTRODUCTION

The Jenco Model 6308PT (pH 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 6308PT microprocessor allows the user to easily

recalibrate the parameters for the probes. 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 pH, Temperature, Alarm status

and current output in one LCD graphic screen. The LCD also

includes a backlight for dark environments. This system uses glass

electrode for the pH and a precise thermistor for temperature

providing you with accurate readings for all your measurements.

The model 6308 PT is equipped with 5 relays (2 active Low and 2

active High relays for pH and one programmable high or low relay

for temperature); all relays are hysteresis driven and configurable to

CENTER or EDGE mode. The system also has a isolated 4-20mA

analog output, offset and span configurable for the pH display.

The model 6308 PT comes with a RS485 interface that can easily let

the user log all data (from multiple model 6308) with an IBM©

PC/AT compatible computer.

II. 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.

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.

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 power again.

III. USING THE JENCO MODEL 6308 PT

A. FRONT PANEL

1. The [MODE / -- ] key.

1a. In Main Display mode this key has no function.

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.

2. The [CAL / VIEW] key.

2a. Pressing this key for about 2 seconds, during main

display mode will switch to Calibration/Setting mode.

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 will return the user

to the main display 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.

4a. During Calibration/Setting mode this key will decrement

the blinking digit of the active parameter.

4b. During pH calibration, instead of SAVING the new pH

Stand or Slope you can press this key to recalibrate the

buffer again.

5. The [ ↵ ] ENTER key.

During Calibration/Setting mode, this key will save the

current modified parameter and move to the next parameter.

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. MAIN DISPLAY MODE

1. EFFICIENCY - this

will display the

efficiency of the pH

electrode based on the

last pH calibration.

2. CURRENT OUT -

this will display the

actual output of the 4-20

mA circuit. At

POWER-ON this will

show “OFF” for about 3

seconds before going to

main display mode. After exiting the Calibration /Setting pages a

“FROZEN” message will be displayed for about 3 seconds if the

unit is not password locked.

3. annunciator - This will be displayed if Calibration

/Setting pages are password locked meaning the user

can’t calibrate or change the settings unless the correct 4 digit

number has been entered, but user still can view all the

settings.

4. H1 annunciator - this is the status of pH Relay 1, if this is

displayed then the high action relay is ON.

5. H2 annunciator – this is the status of pH Relay 2, if this is

displayed then the high action relay is ON.

6. L3 annunciator – this is the status of pH Relay 3, if this is

displayed the low action Relay is ON.

7. L4 annunciator – this is the status of pH Relay 4, if this is

displayed then the low action Relay is ON.

8. H5 or L5 annunciator – this is the status of the Temperature

Relay 5, if this is displayed then the Relay is ON. H5 means the

relay action is HIGH while L5 means the relay action LOW.

9. pH Display.

10. 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. 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

6308PT can be used with 115 or 230VAC 50/60 Hz. Power

consumption is 6 watt. 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 115VAC 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.

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 VIII. ERROR DISPLAYS

AND TROUBLESHOOTING).

If the message persists then you

might need to call your distributor. (See XI. WARRANTY).

After the self-diagnostic is complete the temperature will be

displayed on the lower part of the LCD screen and you are ready to

make pH calibration or measurements. Just immerse the probes

halfway to the buffer or liquid. If possible do not allow the probes to

touch any solid object in the buffer or 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.

IV. MODEL 6308 PT MODES

A. MAIN DISPLAY MODE

Turning ON the unit will

always start in main display

mode.

This instrument is designed to provide 2 distinct measurements:

1. Temperature - current temperature of the solution.

2. pH - the current degree of acidity or alkalinity of the solution

with automatic temperature compensation.

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