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JENCO 6308CT, Operation Manual

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JENCO 6308CT Operation Manual Download Page 26

 

25

VII. RS485 INTERFACE OPERATION

 

 

A. INTRODUCTION

 

 
This section assumes you are familiar with the basics of data 
communication, the RS485 interface, a rudimentary knowledge and 
a copy of the more popular Windows

® 

 95+ computer languages   

capable of using a PC RS485 card or RS232-RS485 converter (

third 

party vendor

) module . 

A simple program must be written in order to send your command 
and receive data from the meter. 
A sample source program in VISUAL BASIC

©

 6.0 is included in the 

accompanying disk. 
 

B. PREPARING THE METER   

 
This meter comes equipped with a 2-wire RS485 interface. Just 
connect each terminal to the respective RS485 terminal on your PC. 
(If the DEMO program is not working try reversing the connections 
of the terminals.) After you have connected correctly the meter ( or 
multiple meters with unique ID number) and turned on both the 
meter(s) and the computer, you are now ready to program a simple 
routine to read data from the instrument. 
 
Read the file "6308CT.TXT" in the accompanying disk to jump-start 
you in using the meter with your RS485 enabled PC. 

 
 
 
 
 
 
 

Summary of Contents for 6308CT

Page 1: ...OPERATION MANUAL JENCO MODEL 6308CT MICROCOMPUTER BASED Conductivity TDS Temperature CONTROLLER JENCO ELECTRONICS LTD MANUFACTURER OF PRECISION INSTRUMENTS ...

Page 2: ... 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 T...

Page 3: ...n 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 ...

Page 4: ...t 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 ...

Page 5: ...s 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 ...

Page 6: ...eter 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 C...

Page 7: ...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 return...

Page 8: ...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 th...

Page 9: ...ke 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 d...

Page 10: ...liness 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 possi...

Page 11: ... Temperature current temperature of the solution 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 c...

Page 12: ... Temperature Coefficient T Solution temperature RT Reference Temperature Note The TDS is based on the specific conductance reading of the solution setting the TC to 0 00 will change the reading of conductivity to uncompensated conductivity 3 Total Dissolved Solid TDS The calculation is carried out as in the equation below TDS Compensated Conductivity TDS Factor TDS is an approximation of the total...

Page 13: ...lier that must be determined by the user experimentally The default factor of 0 5 is only useful for a coarse estimate of TDS Temperature and Conductivity or TDS are always simultaneously displayed in the graphic LCD screen in normal mode You can select conductivity or TDS reading by pressing the MODE key in normal mode ...

Page 14: ...he path of the CAL VIEW key 1 You can change any blinking options or digit by pressing the or keys 2 For options in digit format you need to press the MODE key to move to the next digit PRESS CAL VIEW KEY 2 SECONDS MAIN DISPLAY VIEW CHANGE PAGE MAIN DISPLAY CORRECT PASSWORD PASSWORD LOCKED TEMP CONTROL SETTING PAGE YES NO YES NO ENTER PASSWORD YES TEMP CONTROL SETTING PAGE CONTROL FROZEN CONTROL N...

Page 15: ...nit is password locked To change any settings or calibration you need to unlock the system to remove the PASSWORD LOCKED message You need to enter the correct 4 digit number on the ENTER PASSWORD input You 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 Setti...

Page 16: ...ll set the actual cell constant to this value and you must calibrate the cell constant before you can accurately use the unit 2 RANGE for every basic cell constant you can choose 3 different ranges for conductivity and an additional 3 ranges if you want your relay controls to be in TDS Whichever you choose you can still view the reading in TDS or conductivity but the relay control current out will...

Page 17: ...erimentally determine this factor Even if this factor is determined any change in the ionic substances in the sample will affect the TDS reading Unless the ionic substances in the sample remain constant the TDS can t be determined accurately The default value of 0 5 is only useful for a coarse estimate of TDS 6 C 25 C If the user is calibrating the Cell Constant the user must enter the conductivit...

Page 18: ...ing calibration the user reference temperature is disregarded The reference temperature is fixed at 25 C since this temperature is the most popular reference temperature for all if not most standard solutions 8 Immerse the probe into the solution Do not let the probe touch any part of the container and allow at least 1 minute so the temperature reading will stabilize 9 Shake the probe lightly to r...

Page 19: ... and allow at least 1 minute so the temperature reading will stabilize 8 Shake the probe lightly to remove air bubbles from the probe 9 Read the display Press the MODE key to toggle between conductivity and TDS reading d CONDUCTIVITY or TDS CONTROL SETTING page 1 RELAY1 action The action for this relay is changeable you can choose HI action or LO action In HI action the relay will turn ON if the c...

Page 20: ...AY2 action and press key to save After you select the RELAY2 action you can now select the RELAY2 set point Use and keys to change the blinking digit use the MODE key to select another digit and the key to save the new set point 3 HYSTERESIS mode this is the hysteresis mode for conductivity or TDS RELAY1 and RELAY2 You can choose CENTER or EDGE mode See chapter V CONTROLLING THE RELAYS 4 HYSTERESI...

Page 21: ...can choose CENTER or EDGE See chapter V CONTROLLING THE RELAYS 4 HYSTERESIS value this is the actual value of the hysteresis You can change this value from 0 0 to 19 9 C See chapter V CONTROLLING THE RELAYS 5 RS 485 ID this is the unique ID Address for the unit If you are connecting multiple model 6308CT or other Jenco models for logging purposes then this ID Address must be unique for each connec...

Page 22: ...E HYSTERESIS VALUE If the relay action is set to HI and the hysteresis mode is CENTER the relay will turn ON at RELAY SETPOINT 0 5 hysteresis value and will turn OFF at RELAY SETPOINT 0 5 hysteresis value If the relay action is set to HI hysteresis mode is EDGE the relay will turn ON at RELAY SETPOINT hysteresis value and will turn OFF at RELAY SETPOINT If the relay action is set to LO and the hys...

Page 23: ...ing see fig 1 The hysteresis mode center or edge see figure 1 and hysteresis value will be used by both relays The action of the relays is dependent on set point relay action HIGH or LOW hysteresis mode Edge or Center hysteresis value and the current conductivity or TDS display see fig 1 Fig 1 hysteresis hysteresis LOW SET POINT HIGH SET POINT POINT SET HIGH hysteresis hysteresis EDGE CONTROL ON O...

Page 24: ...mum isolation voltage of the 4 20 mA output is 500 VDC The voltage differential between the 4 20 mA output and the load should not exceed 500 VDC B OUTPUT LOAD The maximum load is 500 Output current inaccuracies may occur for load impedance in excess 500 C Conductivity or TDS Linear Output Conductivity TDS output The linear analog output will be dependent on the 4 mA setting 20 mA setting and the ...

Page 25: ...y or TDS display C 4 conductivity or TDS user setting for 4 mA C 20 conductivity or TDS user setting for 20 mA Note 1 The absolute difference of the 4mA and 20mA settings must be greater or equal to 10 LSD Least Significant Digit of the user range 2 If the absolute difference is smaller than 10 LSD the current output will display ERROR ...

Page 26: ...e program in VISUAL BASIC 6 0 is included in the accompanying disk B PREPARING THE METER This meter comes equipped with a 2 wire RS485 interface Just connect each terminal to the respective RS485 terminal on your PC If the DEMO program is not working try reversing the connections of the terminals After you have connected correctly the meter or multiple meters with unique ID number and turned on bo...

Page 27: ...ctivity TDS or Cell Calibration Reading over user specified range Change range to higher level LERR 10 0 120 0 C Conductivity TDS or Cell Calibration Compensated Calibration exceeds temperature limit Increase or decrease the solution temperature EEPROM BAD Power on Unit has failed its EEPROM test Turn instrument OFF and back to ON again Return for service see Warranty ROM BAD Power on Unit has fai...

Page 28: ...0 1 uS ppm 0 5 1 LSD 0 1 to 9 999 mS ppt 1 00 0 001mS ppt 0 5 1 LSD 1 0 to 30 00 mS ppt 1 00 0 01mS ppt 0 5 1 LSD 0 to 9 999 mS ppt 10 0 0 001mS ppt 0 5 1 LSD 1 to 99 99 mS ppt 10 0 0 01mS ppt 0 5 1 LSD 10 to 300 0 mS ppt 10 0 0 1mS ppt 0 5 1 LSD Temperature Range Resolution Accuracy 10 0 to 120 0 C 0 1 C 0 3 C Conductivity TDS TDS Factor Range 0 300 to 0 999 user selectable Reference Temperature ...

Page 29: ...ype ON OFF control Relay output 5A at 115VAC or 2 5A at 220VAC GENERAL Keys Audio feedback in all keys Security protect 4 digit password Communication RS485 Power 115VAC or 230VAC 50 60Hz Power consumption 6 watts Fuse 315mA 250V fast acting glass tube Ambient temperature range 0 0 to 50 0 C Display 128x64 graphic LCD w backlight Case IPT67 DIN case depth 148 mm Weight 950 g ...

Page 30: ...ne if the product problem is due to deviations or customer misuse Out of warranty products will be repaired on a charge basis RETURN OF ITEMS Authorization must be obtained from one of our representatives before returning items for any reason When applying for authorization have the model and serial number handy including data regarding the reason for return For your protection items must be caref...

Page 31: ...td 6F No 81 Sec 2 Chang an E Rd Jhongshan District Taipei City 104 Taiwan TEL 886 2 2508 2928 FAX 886 2 2508 2938 E Mail sales JENCO com tw Website www JENCO com tw Shanghai Jenco Instruments Co Ltd 18 Wang Dong Zhong Rd Sijing Songjiang Shanghai China 201601 Tel 8621 5761 9600 Fax 8621 5761 9598 Email jencos jenco com cn 20200311 for Model CTN v1 00 ...

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