Sensorex CX20 Bedienungsanleitung

pg.1

Operation Manual

CX20 1/8 DIN

Microcomputer Based Conductivity/Resistivity Controller

11751 Markon Drive Garden Grove, CA. 92841 U.S.A.

pg.2

CONTENTS

GENERAL INTRODUCTION………………………………………..………....................3

INITIAL INSPECTION……...………………..................................................................3

USING THE SENSOREX MODEL CX20……......................................................................3

A. Mounting procedure.....................................................................................3

B. Front panel....................................................................................................4

C. LCD screen....................................................................................................5

D. Rear connectors...........................................................................................5

E. Measure mode.............................................................................................6

F. Setting mode................................................................................................6

G. Conductivity/Resistivity calibration mode..............................................10

H. Controlling the relays.................................................................................10

ERROR DISPLAY AND TROUBLESHOOTING……………..……….........................11

SPECIFICATIONS……………..………………………………………........................12

WARRANTY……………..………...............................................................................13

pg.3

GENERAL INTRODUCTION

Thank you for selecting the Sensorex CX20. The CX20 Conductivity/Resistivity Controller is a

rugged microprocessor based instrument assembled in a watertight 1/8 DIN case, designed

for use in laboratories and process control applications.

The system displays Conductivity / Resistivity or Temperature status in one large LCD screen.

The model CX20 microprocessor performs a self-diagnostic routine every time you turn on

the unit, it will provide you with basic information on the stability of the instrument.

The model CX20 is equipped with 2 control relays. All control relays are programmable and

hysteresis driven.

INITIAL INSPECTION

Carefully unpack the unit and accessories. Inspect for damages made in shipment. If any

damage is found, notify your Sensorex representative immediately. All packing materials

should be saved until satisfactory operation is confirmed.

USING THE SENSOREX CX20 Conductivity/Resistivity TRANSMITTER ERVIEW

A. Mounting Procedure

1. Make a cutout on any panel, with a thickness of 1/16 inch (1.5mm) to 3/8 inch

(9.5mm). Refer to FIG 1

Figure 1

2. Remove the mounting bracket from the controller and insert the controller into the

cutout. Refer to FIG 2.

Mounting Brackets

Figure 2

pg.4

3. Replace the mounting bracket assembly onto the controller and secure the controller

to the mounting panel. Refer to FIG 3.

Panel Mounting brackets

Figure 3

B. Front Panel

The front panel consists of a 4-digit LCD display and 4 keys.

1. [ MODE ] key:

1a. In the Measure mode, this key will switch the display in sequence from Conductivity,

Temperature and back to Conductivity again or from Resistivity, Temperature and back to

Resistivity again.

1b. In the Calibration/Setting mode, pressing this key for five seconds will move you back to the

previous parameter in the case when recalibration / resetting is required.

2. [ UP ] key:

2a. In the Calibration mode, pressing this key will increase the numeral increment. In the Setting

mode, pressing this key will show the next possible option and increase the numeral increment.

2b. In the Measure mode, pressing this key and [ENTER] key at the same time, the unit will enter

the Calibration mode.

3. [ DOWN ] key:

3a. In the Calibration mode,pressing this key will decrease the numeral increment. In the Setting

mode, pressing this key will show the next possible option and decrease the numeral increment.

3b. In the Measure mode, pressing this key and [ENTER] key at the same time, the unit will enter

the Setting mode.

4. [ ENTER ] key:

In any mode where the user can change the settings, pressing this key will save the new settings. If

no change has been made then pressing this key will just lead the user to the next setting.

pg.5

C. LCD screen

HI1 LOW2

HI2 LOW1

CAL

MAN

ATC

12 3 456

1098

1. Major LCD display.

2. CAL – This icon will be displayed if the meter is in the Calibration/Setting mode.

3. HI1 & LOW1 – These icons, when displayed, indicate relay action and relay number.

4. HI2 & LOW2 –These icons, when displayed, indicate relay action and relay number.

5. MΩ– Unit indicator.

6. Ԩ– Temperature and unit display.

7. uS – Unit indicator.

8. ATC –This icon will be displayed when a temperature probe is connected.

9. MAN –This icon will be displayed if no temperature probe is not connected.

10. mS – Unit indicator

D. Rear connectors

LNE

CELL

100~230VAC Rel 1 Rel2

GND 10k TH

GND

* Specify “L’ = “Live Lead” 100 to 230 VAC Volts and “N” = “Neutral Lead”

1. Connect the AC line to the rear of the instrument. The model CX20 can be used with

100~240V AC at 50/60 HZ. Make sure the EARTH connector is connected to the earth lead

of the AC power line.

pg.6

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.

【

Note

】

(1) Make sure that the power is unplugged before wiring your probes etc.

(2) Make sure you connect the AC power cord to the correct AC terminals. Incorrect

connection may damage the unit permanently.

E. Measure mode

Turning on the unit will always display the Measure mode. This instrument is designed to

provide 2 distinct measurements: Conductivity, Temperature or Resistivity, Temperature.

MODE

ATC ATC

MODE MODE

MODE

1. Conductivity – Current conductivity of the solution.

2. Resistivity –Current resistivity of the solution.

3. Temperature – Current temperature of the solution.

【

Note

】

: Pressing [MODE] key in the Measure mode will cycle the display between the two

modes above.

F. Setting mode

Pressing [DOWN] key and [ENTER] key at the same time, the meter will enter into the Setting

mode.

1. Temperature compensation select:

+ENTER

Temperature coefficient select

MAN

CAL

ATC

CAL

ENTER ENTER

Pressing [UP] key or [DOWN] key in this screen will cycle the display between 01

(Thermistor: 10k ohm), 02 (Manual) modes above.

pg.7

Select the preferred temperature compensation mode, press [ENTER] key to save, and

enter the next setting screen.

2. Temperature Coefficient select:

Temperature compensation select

probe Basic cell constant select

ENTER

ENTER ENTER

CAL CAL

Pressing [UP] key or [DOWN] key in this screen will cycle the display between E2.00, E0.00

above.

Select the preferred coefficient, press [ENTER] key to save, and enter the next setting

screen.

3. Probe Basic cell constant select:

Temperature coefficient select

Range select

ENTER

ENTER ENTER ENTER

CAL CALCAL

Pressing [UP] key or [DOWN] key in this screen will cycle the display from C1.00, C0.10 to

C0.01 basic cell constant above.

Select the preferred basic cell constant, press [ENTER] key to save, and enter the next

setting screen.

4. Range select:

Pressing [UP] key or [DOWN] key in this screen will cycle the display from

CF01/0.000~1.999uS/cm, CF02/0.00~19.99uS/cm, CF03/0.000~1.999MΩ,

CF04/0.00~19.99MΩ(Basic cell K is C0.01) or CF01/0.00~19.99uS/cm,

CF02/0.0~199.9uS/cm(Basic cell K is C0.10) or CF01/0.0~199.9uS/cm, CF02/0~1999uS/cm,

CF03/0.00~19.99mS/cm (Basic cell K is C1.00) above.

pg.8

Select the preferred basic cell constant , press [ENTER] key to save, and enter the next

setting screen.

ENTER

ENTER ENTER ENTER ENTER

CAL

Relay 1 HI/LOW select

CAL CAL CAL CAL

ENTER

ENTER ENTER

CAL

CALCAL

Relay 1 HI/LOW select

ENTER

ENTER ENTER ENTER

CAL

CAL CAL CAL

Relay 1 HI/LOW select

pg.9

5. Relay 1 High / Low select:

Range select

Relay 1 set point value

ENTER

ENTER ENTER

HI1CAL CAL LOW1

Pressing [UP] key or [DOWN] key in this screen will cycle the display from HI、LOW

modes above. Select the preferred mode, press [ENTER] key to save, and enter the next

setting screen.

【

Note

】

:See “H. Controlling the relays ” page.

6. Relay 1 set point value :

Pressing [UP] key or [DOWN] key in this screen to

adjust the value, press [ENTER] key to save, and enter

the next setting screen.

7. Relay 1 hysteresis value:

Pressing [UP]

key or [DOWN] key in this screen to adjust the

value, press [ENTER] key to save, and enter the

next setting screen.

8. Relay 2 High / Low select:

Same as “Relay 1 work way select”

Relay 1 Hysteresis value

ENTER

CAL

Relay 1 HI/LOW select

Relay 2 HI/LOW select

Relay 1 set point select

ENTER

CAL

ENTER

pg.10

9. Relay 2 set point value:

Same as “Relay 1 set point value”

10. Relay 2 hysteresis value:

Same as “Relay 1 hysteresis value”

G. Conductivity/Resistivity Calibration mode

The model CX20 uses 1-point calibration for conductivity or resistivity.

In the Measure mode, pressing [UP] key and [ENTER] key at the same time to allow the

meter to go to the Conductivity / Resistivity calibration mode.

At the Conductivity / Resistivity calibration mode, the “CAL” icon and a

conductivity/resistivity reading will display. Rinse the conductivity probe in distilled water

and immerse it into the standization solution. Allow temperature reading to stabilize, press

[UP] key or [DOWN] key to change this reading to that of the standization solution value,

then press [ENTER] key to save. Calibration is now completed.

H. Controlling the relays

1. Isolation voltage:

The maximum isolation voltage of the relay output contacts is 1500 VDC. The voltage

differential between the relay output contacts and the load should not exceed 1500 VDC.

2. Output load:

The current through the relay output contacts should not exceed 5 Amp at 115 VAC and

2.5 Amp at 230 VAC in order not to cause permanent damage to the relay contacts. This

rating is specified for resistive loads only.

3. Relay action, relay set point and hysteresis value:

Relay

Action

Effective RELAY-ON Set

Point

Effective RELAY-OFF Set

Point

HI S.P. + (1/2 H.V) S.P. – (1/2 H.V)

LOW S.P. – (1/2 H.V) S.P. + (1/2 H.V.)

S.P. = Relay Set point H.V. = Hysteresis value (Dead Band)

If the relay action is set to HIGH, the relay will turn ON at (Set Point +1/2 Hysteresis ), and will turn OFF at

(Set Point -1/2 Hysteresis ).

If the relay action is set to LOW, the relay will turn ON at (Set Point -1/2 Hysteresis ), and will turn OFF at (Set

Point +1/2 Hysteresis ).

There are two Independent relays the user can bind to the Conductivity or Resistivity mode. The user can

only bind the two relays to one reading mode at a time. The user can change this anytime by changing

option at the setting mode.

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