Myron L 756II, 757II, 758II, 759II, 751II Instruction Manual

...

Water Quality Instrumentation

Accuracy • Reliability • Simplicity

750 Series

CONDUCTIVITY/TDS

RESISTIVITY

MONITOR/CONTROLLER

Operation

Manual

25 January 06

INSTALLATION • OPERATION • MAINTENANCE

ACCURACY • RELIABILITY• SIMPLICITY

750 Series II MONITOR/CONTROLLER

QUICK REFERENCE GUIDE!

If you read nothing else in this manual please read this Quick Reference Guide.

PLEASE READ and COMPREHEND ALL WARNINGS, CAUTIONS and ADVISEMENTS

CONTAINED WITHIN THIS MANUAL.

Failure to comply is beyond the responsibility of the Myron L Company.

WARNING: ALL MONITOR/CONTROLLERS ARE FACTORY SET TO OPERATE ON 115 VAC. BEFORE APPLYING POWER ENSURE THE INPUT POWER “115/230 VAC” SELECTION IS CORRECT FOR YOUR REQUIREMENTS. FAILURE TO DO SO IS BEYOND THE RESPONSIBILITY OF THE MYRON L COMPANY. See section II.E.2. and figure II.E.1.

NOTE: SOME MODELS MAY HAVE EITHER A 24 VAC OR A 24 VDC INPUT POWER REQUIREMENT - CHECK LABELS CAREFULLY.

WARNING: ENSURE POWER IS OFF WHILE INSTALLING ELECTRICAL EQUIPMENT. IF MONITOR/ CONTROLLER IS INSTALLED, ENSURE THE POWER IS OFF BEFORE SERVICING. FAILURE TO DO SO COULD CAUSE DAMAGE TO THE INSTRUMENT, AND COULD BE HARMFUL OR FATAL TO PERSONNEL. ONLY QUALIFIED PERSONNEL SHOULD INSTALL OR SERVICE ELECTRICAL EQUIPMENT.

WARNING: THE DISPLAY WILL BE IRREPARABLY DAMAGED IF THE DISPLAY HARNESS IS INSTALLED UPSIDE-DOWN OR MISALIGNED. THE HARNESS MUST BE INSTALLED AS SHOWN IN FIGURE II.E.8.

CAUTIONS: Before installation, ensure you have the correct model (with options), AND it is ranged for your application. See sections I.A., I.B. & I.G. Do you have the correct sensor? See section I.E. Mounting requirements. What is needed? See section II.B.

The following will give the installer and user a quick overview. See the sections listed for details.

REMOVING FRONT PANEL NOTE: When opening instrument, remove front cover with care;

a ribbon cable connects the front panel and main board.

1. Ensure power is OFF.

2. Remove the two (2) screws on the front panel.

3. Carefully wiggle the front panel to loosen the gasket and pull gently toward you. Do not pull more than about 8 inches/20CM or you could damage the wiring harness.

REASSEMBLY

1. Carefully reinstall the front panel, bottom first. Ensure no wires have been pinched between enclosure and front panel.

2. Reinstall the two (2) screws and tighten.

3. To operate, turn power ON.

INTRODUCTION - Section I.

This section covers the specifications of your new Monitor/controller including sensor information.

INSTALLATION - Section II.

This section covers how to install your new Monitor/controller; mechanically and electrically.

OPTIONS & ACCESSORIES - Section III.

This section covers the specifications, installation, set up, and operation of each option.

QUICK LOCATOR

SC/SCO MODULE, (Second Relay), see section III.A.

4A/4AO MODULE (4-20mA), see section III.B.

TP/TPO MODULE (Temperature), see section III.C.

TH/THO MODULE (Alarm /control Harness), see section III.D.

DUAL (stacking) Temperature (TPO) & 4-20mA (4A/4AO), see section III.E.

3SO/3SE MODULE (3 Sensor option) , see section III.F.

3RO/3RE MODULE (3 Range option), see section III.G.

3SRO/3SRE MODULE (Combined 3 Sensor & 3 Range option), see section III.H.

PA/PAO (Piezo Alarm), see section III.I.

RA (Remote Alarm), see section III.J.

OPERATING PROCEDURES - Section IV.

This section covers a brief description of different models and their features; how they work, and how to set them up for your particular use.

QUICK SET POINT CONVERSION (SPC) /

REVERSING SET POINT - See Section IV.C.1.

Conductivity/TDS Monitor/controllers are configured to trigger the alarm relay as the conductivity/TDS reading increases. Resistivity Monitor/controllers are configured to trigger the alarm relay as the resistivity reading decreases. To reverse:

1. Locate the jumper block for the alarm to be configured. See figure V.A.1.

2. Remove and rotate the jumpers 1/4 turn and reinstall them on their posts.

QUICK CHECK-OUT PROCEDURE -

See Section IV.C.2.

It is assumed that the Monitor/controller power is ON, that it is

Continued

connected to an appropriate Sensor, and that the Sensor is immersed in water within the range that the Monitor/controller will be required to read; and the front panel is removed.

1. Make a note of the reading on the display.

2. While pressing the Calibration/Full Scale Test Switch (FS SW), verify that the front panel display is indicating a full

scale reading. If not, see Calibration, section V.C.

3. Press and hold the "SET POINT" switch on the front

panel. Using a tweaker or a small screwdriver, adjust the Set Point trimmer adjustment screw on the circuit board to sweep the display from zero to full scale. (A digital display may be blank at the full scale end. This is normal.) Listen for the alarm relay to click on and off as the alarm set point moves past the water reading.

4. Adjust the alarm to the desired set point value. Release

the "SET POINT" switch.

NOTE: For Models with SC/SCO module, repeat STEPS 3 & 4 to check out Set Point #2.

QUICK SET POINT ADJUSTMENT -

See Section IV.C.3.

The set point setting is based upon the user's particular water purity specifications or requirements. NOTE: The optional second relay/alarm is “stacked” on the first relay/alarm, therefore, when setting the optional second relay/alarm Set Point, the #1 Set Point must be ‘set’ first.

1. While pressing the "SET POINT" switch, turn the Set Point #1 adjustment screw (see figure V.A.1) until the desired set point value is indicated on the display.

HYSTERESIS (DEAD BAND) ADJUSTMENT -

See Section IV.C.4.

PRIMARY COMPONENT IDENTIFICATION -

Section V.A.

Review the figure below to familiarize yourself with the Main circuit

(-)

0-10VDC OUTPUT

3SO/3SE &/OR 3RO/3RE SWITCH CONNECTION

MAIN CALIBRATION CONTROL

RANGE MODULE ALIGNMENT

RANGE MODULE

SC/SCO OPTIONAL SECOND ALARM/ CONTROL MODULE

#2 RELAY LIGHTS & SWITCH CONNECTOR

RUBBER TAPE (DO NOT REMOVE)

Figure V.A.1

SENSOR

BK WT RD GN NU R- R+

}

-121 2000µS

TRANSFORMER

115/ 230

POWER

{

CAL

INC

751 756 752 757 753 758 754 759

MYRON L COMPANY

FUSE*

AC AC GD NC NO CM

AC HOT/ +DC

AC NEUTRAL/ -DC

GROUND

(+)

FULL SCALE PUSH TO TEST

SET POINT #1 CONTROL

INC DIS

SPC

INC

CM NO NC

NC NO

HYS1SP1FS SW

SPC

SECOND RELAY

REMOVE TO INSTALL

COM

DEC

SET POINT #1 HYSTERESIS RIGHT INC LEFT DEC

SOLID STATE (24VDC 30mW) OUTPUT PA™ PIEZO ELECTRIC ALARM OR RA™ REMOTE ALARM OR CUSTOMER CONNECTION

DISPLAY/METER CONNECTOR

SET POINT #1 CONVERSION

DISPLAY CALIBRATION CONTROL (FACTORY SET)

4-20 CONNECTOR

SET POINT #2 HYSTERESIS RIGHT INC / LEFT DEC

SET POINT #2 CONTROL

COM

SOLID STATE (24VDC 30mW)

OUTPUT

PA RA

RA™ REMOTE ALARM AND PA™ PIEZO ELECTRIC ALARM OR

CHS

GND

CUSTOMER CONNECTION

CHASSIS GROUND - OEM

RELAY #1

}

SET POINT #2 CONVERSION

RELAY #2

}

board assembly. The diagram has the second alarm/control module option installed.

QUICK CALIBRATION - Section V.C.

WARNING: When performing calibration procedures, the technician must take extreme care to avoid contacting the circuitry other than the CALibration control. Failure to do so could result in damage to the equipment, property and/or personal injury.

The following assumes the front panel has been removed and the power is ON.

ELECTRONIC CALIBRATION (CIRCUIT ONLY) -

See Section V.C.1.

Full Scale Adjustment

1. Press and hold the Full Scale Test switch. The display should indicate Full Scale for the particular range selected, i.e. 0-500 ppm should indicate 500. If not, set to Full Scale with the CALibration control.

2. Turn power OFF.

3. Re-install front panel as described in “REASSEMBLY”.

4. To operate, turn power ON.

10VDC Calibration - See Section V.C.1.b.

Using Standard Solutions - Section V.C.2.

The BEST method of verifying and recalibrating your conductivity/TDS Monitor/controller is with NIST traceable Standard Solution (available from the Myron L Company). Because it includes the sensor, the entire system is recalibrated. NOTE: Since standard solution calibrations are NOT practicable with resistivity models, another means of verification or calibration of resistivity models is to use the transfer standard method, using a hand-held or portable instrument capable of resistivity measurements, i.e. the Myron L Ultrameter™. See section V.C.4 for description. The following procedure describes the easiest method for standard solution calibration of your Conductivity/TDS Monitor/controller.

1. Using a standard solution which is 60-90% of full scale

of the instrument, rinse thoroughly and fill a clean glass beaker with the standard solution.

2. Place sensor in the beaker of standard solution. The

level of standard solution must be high enough to cover at least 1/2" above cross hole.

3. Slowly shake the sensor to remove air bubbles from

inside the sensor bore hole.

4. Allow 5-10 minutes for temperature to equilibrate. For the

quickest and the best results, both the sensor and solution should be at the same temperature.

5. Turn power ON.

6. If the reading is different from the standard solution,

adjust CALibration control on the main circuit board until the reading matches the solution value.

7. After adjustment, turn power OFF.

8. Re-install front panel as described in “REASSEMBLY”.

9. To operate, turn power ON.

SENSOR SUBSTITUTE CALIBRATION -

See Section V.C.3.

TRANSFER STANDARD METHOD - See Section V.C.4.

14 Jan 03

MICROSIEMENS / CM

750II

MYRON L

COMPANY

HIGH

LOWSET POINT

750 Series II

Model 758II-121-SC

(A Digital Conductivity

Monitor/controller,

with a Range of 0-2000 µS,

and a Second Alarm/Control)

TABLE OF CONTENTS

SECTION PAGE

750 Series II ILLUSTRATION (758II-121-SC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

I. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

A. SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1. Functional Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

B. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

C. OPTIONAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

D. ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

E. SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1. Conductivity/TDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2. Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3. Sensor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

F. ORDER INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1. How to order Monitor/controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2. How to order Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

G. RANGE SELECTION GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

II. INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

A. GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

B. MECHANICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1. Surface Mounting with SMP (surface mounting plate) Assembly . . . . . . . . . . . . . . . . . . . . . . . . . 9

2. Surface Mounting without SMP Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3. Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

C. OEM MECHANICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1. Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2. Analog Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3. Digital Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

D. SENSOR INSERTION / DIP MOUNT ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

1. Insertion Mode Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. Alternate Dip Sensor Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

E. ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1. Main AC Power Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2. 115/230 VAC Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3. Connecting the Sensor Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

a. Modification for US Pharmaceutical 25 (No Temperature Compensation) . . . . . . . . . . . . . . 12

4. Solid State Output Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

a. Piezo Electric Alarm Installation (option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

b. Remote Alarm Connection (RA option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

c. Connect to your own alarm or ? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5. Alarm/Control Relay Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6. Connecting Display Harness to Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

F. 0-10 VDC OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

1. Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

2. Voltage Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

G. RE-RANGE YOUR MONITOR/CONTROLLER (Range Module Installation) . . . . . . . . . . . . . . . . . . . . . . . . 16

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

3. Changing Analog Meter Scale (dial) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4. Label Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

III. OPTIONS & ACCESSORIES INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

A. SC/SCO MODULE (SECOND ALARM/CONTROL OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

a. Set Point Conversion (SPC) / Reversing Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

b. Set Point Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

c. Hysteresis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

d. Second Relay Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

e. Solid State Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

TABLE OF CONTENTS Continued

SECTION PAGE

B. 4A/4AO MODULE (4-20mA OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2. Installation . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3. Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4. Converting a Current to a Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

C. TP/TPO MODULE (TEMPERATURE OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3. Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

a. TPC “Calibration”Module Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

b. Precision Resistor Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

c. System Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4. Alarm/control Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

5. OEM Installation (Single Display) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

6. OEM Installation (Dual Display) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

D. TH/THO MODULE (ALARM /CONTROL HARNESS OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

E. DUAL (stacking) TEMPERATURE MODULE (TPO) & 4-20mA MODULE (4AO) . . . . . . . . . . . . . . . . . . . . . 39

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

F. 3SO/3SE MODULE (3 SENSOR OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

3. Alarm/control Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

G. 3RO/3RE MODULE (3 RANGE OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43

3. Alarm/control Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

H. 3SRO/3SRE MODULE (COMBINED 3 SENSOR & 3 RANGE OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

3. Alarm/control Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

I. PA PIEZO ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

J. RA REMOTE ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

IV. OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

A. FRONT PANEL INDICATORS & CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

1. Red "Set Point" LED Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

2. Green "Set Point" LED Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

3. "Set Point" Switch(es) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

4. Analog Meter or Digital Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

5. Optional Front Panel Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

B. OEM FRONT PANEL INDICATORS & CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

1. Red "Set Point" LED Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

2. Green "Set Point" LED Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

3. "Set Point" Switch(es) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

4. Analog Meter or Digital Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

5. Optional Panel Mounted Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

C. SETUP PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

1. Set Point Conversion (SPC) or Reversing Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

2. Check-Out Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

3. Set Point Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

4. Hysteresis (Dead Band) Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

TABLE OF CONTENTS Continued

SECTION PAGE

V. COMPONENT IDENTIFICATION, CALIBRATION AND PREVENTIVE CARE . . . . . . . . . . . . . . . . . . 56

A. PRIMARY COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

B. METER MECHANICAL ZERO PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

C. CALIBRATION PROCEDURES - MAIN CIRCUIT BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

1. Electronic Calibration (Circuit Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

2. Calibration Using Standard Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

3. Sensor Substitute Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

4. Transfer Standard Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

D. PREVENTIVE CARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

VI. OPTIONS & ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

A. OPTIONS ORDERED WITH MONITOR/CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

B. OPTIONS & ACCESSORIES ORDERED SEPARATELY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

C. STANDARD SOLUTIONS & BUFFERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

VII. REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

VIII. WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

IX. GLOSSARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

X. NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

XI. ADDENDUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

A. CONDUCTIVITY, TDS AND TEMPERATURE RELATIONSHIPS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

I. INTRODUCTION

Thank you for selecting one of the Myron L Company’s new 750 Series II Monitor/controllers. The 750 Series II is based on input from ‘you’ - our customers, time proven designs, and many years of instrumentation experience. Since 1957, the Myron L Company has been providing customers with quality products at an affordable price by designing and producing products that are Accurate, Reliable, Simple to use. Quality you have come to rely and depend on. As you read through this operation manual you will see the 750 Series II is truly designed to be user friendly with simple to install options, and easy re-rangeability as conditions or applications change. This manual is actually more complex than the 750 Series II Monitor/controller. Where applicable the Original Equipment Manufacture (OEM) models are separated as necessary to clarify and define their differences. As defined by the Myron L Company, an OEM model does not have an enclosure. However, many OEMs use our enclosure just as if it were a standard model, therefore, as an end user you must decide whether to follow the OEM instructions or the “standard” models with enclosure. All OEMs mount the circuit board assemblies in differing locations making it impossible for us to describe exactly where to find them. By looking in section V. for the Main circuit board (CB) assembly, you will have a picture of what it looks like. If your OEM has a display, follow the display harness back to the Main CB. Once located you will be able to locate any installed options by following the harnesses, i.e. 4A (4-20mA output).

A. SCOPE

This operation manual provides the user with the necessary information to install, operate and maintain the Myron L Company's 750 Series II Conductivity/TDS & Resistivity Monitors/controllers. Section I. provides Descriptions, Applications, Specifications. Section II. Installation; mounting, wiring and set up. Section III. Options and Accessory installation procedures. Section IV. Operating procedures. Section V. Identifies their primary components and provides the

user with easy-to-use calibration and preventive care

procedures. Section VI. Options & Accessories List. Section VII. Replacement Components. Section VIII. Warranty information. Section IX. Glossary, definitions. Section X. Notes. Section XI. Addendum.

1. FUNCTIONAL DESCRIPTIONS

All models except OEMs have water & corrosion resistant IP64/NEMA 3 housings suitable for panel, bench or surface mounting. The 750 Series II are a compact 6.0" (152mm) x 4.8" (122mm).

Bright green/red LEDs indicate HIGH/LOW set point readings. All models except 751II, 754II, 756II, & 759II, (see below) feature

a heavy-duty 10 amp output relay, operating on either increasing or decreasing readings.

For specific Monitor/controller configurations, reference the following individual model descriptions.

Models 757II Conductivity/TDS & 752II Resistivity

Analog Monitor/controller. Standard front panel is equipped with a linear analog meter display and a "SET POINT" switch with High/Low indicator lights. Single set point is internal to discourage unauthorized adjustments. A second set point alarm/control is available as an option. 4-20mA output option is available on OEM models only.

Models 758II Conductivity/TDS & 753II Resistivity

Digital Monitor/controller. Standard front panel is equipped with a 3 1/2 digit liquid crystal display (LCD), and a "SET POINT" switch with High/Low LED indicator lights. Single set point is internal to discourage unauthorized adjustments. A second set point alarm/control is available as an option. May use an optional 420mA output for PLC or SCADA operations.

Models 756II Conductivity/TDS & 751II Resistivity

Analog monitor ONLY. Standard front panel is equipped with a linear analog meter, no relay, LED indicators or set point switch. A 4-20mA output option is available on OEM models only.

Models 759II Conductivity/TDS & 754II Resistivity

Digital monitor ONLY. Standard front panel is equipped with a 3 1/2 digit liquid crystal display (LCD) only, no relay, LED indicators or set point switch. May use an optional 4-20mA output for PLC or SCADA operations.

2. APPLICATIONS

Conductivity/TDS

Reverse Osmosis Process Control Seawater Desalinization Wastewater Treatment Food Processing Plating Power Plants Laboratories Printing Boiler Cooling Tower Agriculture/Aquaculture

Are just a few of the applications

Resistivity

Deionization (DI) and Distillation Ultrapure Water

Treatment Systems Electronics Pharmaceutical Laboratories Food Processing Plating Power Plants

Are just a few of the applications

B. SPECIFICATIONS

RANGES: 34 Conductivity/TDS ranges from

0-1µS/µM/ppm to 0-200mS/mM/ppt

7 Resistivity ranges from 0-200KΩ to 0-20MΩ.

Refer to Range Selection Guide on Page 8.

DISPLAY:

Models 756II, 757II & 751II, 752II:

2 1/2” (63mm) analog meter

Models 758II, 759II & 753II, 754II:

13 mm/1/2 in. 3 1/2 digit LCD NOTE: 3 1/2 digit LCD may be replaced with either a 3 1/2 or a 4 1/2 digit backlit LCD - available as options.

ACCURACY

Analog Models: ±2% of Full Scale Digital Models: ±1 % of Full Scale

SENSITIVITY

0.05% of span

STABILITY

0.05% of span

AMBIENT TEMPERATURE RANGE

0 - 60°C/32 - 140ºF

DIMENSIONS

152 H x 122 W x 96 D mm / 6.0 H x 4.8 W x 3.8 D in.

HOUSING CONSTRUCTION

Fully gasketed heavy-duty ABS for splashproof and corrosion

resistance. Rated IP64/NEMA 3 Double Insulated (with circuit board ground for OEM operation)

DOUBLE INSULATED

REPEATABILITY

0.1% of span

CALIBRATION CHECK

Built in full scale value

RECORDER OUTPUT

0-10 VDC @ 5 mA max. (linear); standard on all models

OUTPUT IMPEDANCE

100Ω ±5%

SENSOR INPUT 1 (optional 3 sensor Input available)

CONTROL FUNCTION

Models 757 , 758 & 752 , 753 :

Single set point alarm/control continuously adjustable

0-100% of span

Second set point alarm/control (Optional).

Continuously adjustable - 0-100% of span

Hysteresis

Adjustable from 0.3-3% of full scale

Indicators

"HIGH" (red) and "LOW" (green) set point LEDs - reversible.

Relay Contact Rating

SPDT 10 amp @ 250 VAC, 30 VDC. Relay operates

increasing or decreasing reading (user selectable).

Solid State Output

24 VDC unregulated, 30 mA Maximum. Powers optional PA - Piezo Electric Alarm, RA - Remote

Alarm™, or ?

Second Alarm/control Module, with above specifications, opt. on

Models 757 , 758 & 752 753

POWER SPECIFICATIONS

115/230 VAC ±15%, 50/60 Hz (User selectable)

overvoltage category II 100 mA Maximum Current Double Insulated (with circuit board ground for OEM operation)

Fuse - 100 mA Slow Blow (T.10A) for both 115 & 230 VAC (V~)

User replaceable Humidity - 20-90% non-condensing Max. Altitude -

12,000 meters/40,000 ft. non-operating

3000 meters/10,000 ft. operating Pollution degree 2 24 VAC or 24 VDC Option available on Special Order Overvoltage category II (24 VAC) 250 mA Maximum Current Double Insulated (with circuit board ground for OEM operation) Fuse - 250 mA Slow Blow (T.25A) User replaceable

WEIGHT

750 Series : average 0.9 kg/2 Ibs.

C. OPTIONAL FEATURES

D. ACCESSORIES (ordered separately)

† Add C = Cond or R = Res to part number * Customer mounted separately

See sections VI & VII for complete selection and details.

-SC Second Alarm/control Module (M/c only)

-4A 4-20 mA Isolated Output Module (digital models only)

-PA 70 db Piezo Electric Alarm (digital M/c only)

-PAT Piezo Alarm & Timer Module (digital M/c only)

-45BL 4 1/2 Digit Backlit Liquid Crystal Display (LCD)

-35BL 3 1/2 Digit Backlit Liquid Crystal Display (LCD)

-TP Temperature Module 0-200ºC, requires -TP Sensor (digital Monitor/controllers only)

-TH TP/TPO Alarm/control Harness (req. SC & TP) (digital only)

-PC 115 VAC Power cord (8 ft./2,44 meters) with USA plug and strain relief) - NOT for use with 230 VAC.

-24VA 24 VAC Isolated Power Supply (special order)

-24VD 24 VDC Isolated Power Supply (special order)

-PTS Panel mounted Full Scale Test switch (special order)

See sections VI & VII for complete selection and details.

Aquaswitch , auto RO/DI switching system (req. M/c)

SCO Second Alarm/control Module (Monitor/controllers only) 4AO 4-20 mA Self-Powered Isolated Output Module (digital only) 3SE 3 Sensor Input Module with Enclosure 3SO 3 Sensor Input Switch Module with 1 meter/3 ft. cable* 3RE 3 Range Switch with Enclosure† 3RO 3 Range Switch with 1 meter/3 ft. cable†* 3SRO

3SRE PAO 70 db Piezo Electric Alarm only (753 /758 )

PATO Piezo Alarm & Timer Module (753 /758 ) 45BLO 4 1/2 Digit Backlit Liquid Crystal Display (LCD) 35BLO 3 1/2 Digit Backlit Liquid Crystal Display (LCD) TPO Temperature Module 0-200ºC - requires -TP Sensor

THO TP/TPO Alarm/control Harness only

PCO Power Cord 115 VAC (8 ft./2,44 meters) with USA plug

SMP50 Surface Mounting Plate RA Remote Alarm™ - RA (Monitor/controllers only) VR Power Supply, 24 VAC, 20 VA. (115 VAC, indoor use) 024-1 1 in. NPT 24 VAC Solenoid Valve CS-11 20 MΩ Resistivity Calibration Module (NIST Traceable) CS-14 2 MΩ Resistivity Calibration Module (NIST Traceable) CS-17 200 KΩ Resitivity Calibration Module (NIST Traceable)

Above 3SO & 3RO combined with enclosure†. Above 3SO & 3RO combined†*

(digital models only)

(requires SCO & TPO)

and strain relief) - NOT for use with 230 VAC.

E. SENSORS

1. CONDUCTIVITY/TDS

750 series Conductivity/TDS Monitor/controllers use the CS51LC, CS51 or CS52 Series sensor depending on range. The

1.0 cell constant CS51 model is recommended for ranges of 0-10 through 20,000 µS/ppm. Its compact size allows mounting in a standard 3/4" tee. The sturdy polypropylene bushing is modular for easy, inexpensive replacement. Other models available by special order.

* -TP Sensor 8 wire cable contact the Myron L Company

TEMPERATURE COMPENSATION

Automatic to 25°C, between 0-100°C/32-212°F except high temperature models - up to 205°C.

PRESSURE/TEMPERATURE LIMITS

CS10 & CS51 - 100 psi/689.6 kPa at 100°C/212°F For higher limits, see specifications below.

CS52 sensors have a 10.0 cell constant and are used for conductivity/TDS values above 20,000 µS/ppm.

CS51LC sensor has a cell constant of 0.1 and is used for conductivity/TDS values of 0-1 to 0-5 µS/ppm.

Special order High Temperature, High Pressure sensors; and Low Cost, Low Temperature, Low Pressure sensors are available. For detailed descriptions of these and other sensors, see Sensor Selection Guide and specific sensor data sheets available from your local distributor, the Myron L Company, or on line at www.myronl.com.

2. RESISTIVITY

750 series Resistivity Monitor/controllers use the CS10 sensor. It has a cell constant of 0.05 and is used for ultra pure water applications. Other models available by special order.

3. SENSOR SPECIFICATIONS

See sensors price list for complete selection and details.

STANDARD MODELS — 316 Stainless Steel CONSTANT CS51LC: For ranges 0-5 µS/ppm & below 0.1 CS51: For ranges between 0-10 & 0- 20,000 µS/ppm 1.0 CS52: For ranges above 20,000 µS/ppm 10.0 CS10: For ALL Resistivity ranges 0.05

See Range Selection Guide, Page 8.

SPECIAL ORDER MODELS — 316 Stainless Steel CS40 Conductivity/TDS Valve Insertable 100 psi

@ 150°C (10.0, 1.0, 0.1 & 0.05) CS40HT Above High Temp Model 250 psi @ 205°C CS41 Cond/TDS High Temp Model 100 psi @ 150°C CS41HT Cond/TDS High Temp Model 250 psi @ 205°C CS50 Conductivity/TDS 100 psi @ 95°C (1.0 & 0.1) CSA Low Cost Conductivity/TDS - NO Temperature

Compensation 75 psi @ 60°C (1.0) CSATC Low Cost Conductivity/TDS - with Temperature

Compensation 75 psi @ 60°C (1.0)

4. SENSOR OPTIONS

-T Titanium - in place of Stainless Steel

-TP Temperature Sensor 0-200°C (special order)

-WTV Wet-Tap Valve for CS40 (0.1 & 1.0 only)

-JB Junction Box - Class I, Group D, Div. S, explosion and weather proof aluminum. For CS40/CS40HT.

-STF Sanitec Fitting for CS10, CS51 & CS51LC. 1/2” thru 4”. State size, i.e. STF1/2

-25 25’ Shielded Cable (Standard 5 wire sensor)*

-100 100’ Shielded Cable (Standard 5 wire sensor)*

-PV 1/2" PVDF fitting for CS10 & CS51 ONLY {replaces polypropylene}

-HPSS 1/2" 316 STAINLESS STEEL fitting for CS10 & CS51 ONLY (replaces polypropylene).

BUSHING

CS51 (LC): Modular Polypropylene threaded 3/4" NPT CS52: 316 stainless steel 3/4" NPT internal to cell body CS10: Modular Polypropylene threaded 3/4" NPT

CABLE

Shielded; 10 ft./3 meters standard 25 ft./7 meters, and 100 ft./30 meters lengths also available

DIMENSIONS

CS51(LC): Metal portion 30 mm/1.2 in. L; 13 mm/0.5 in. DIA

CS10: Metal portion 30 mm/1.2 in. L; 13 mm/0.5 in. DIA For other models see sensor selection & specific data sheets for details.

F. ORDERING INFORMATION

1. HOW TO ORDER MONITOR/CONTROLLERS

MODEL RANGE OPTIONS

758 — 121 — SC - 4A - PA Written as — 758 -121-SC-4A-PA

This is a Digital Monitor/controller with a 0-2000 µS range, a Second Alarm/control, a 4-20 mA output and a Piezo Electric Alarm.

NOTE: Monitor model number does not include sensor. Please specify sensor required when ordering.

RANGE SUFFIXES:

See RANGE SELECTION GUIDE, Page 8.

2. HOW TO ORDER SENSORS

Add option to model number as in examples below.

MODEL OPTIONS

CS51 — T-TP-100 Written as — CS51-T-TP-100

The above is a model CS51 sensor made with Titanium, with the Temperature sensor, and a 100 foot cable.

EXAMPLE:

MODEL OPTIONS

CS40HT — 01-T-WTV-TP Written as — CS40-01-T-WTV-TP The above is a Special Order High Temperature sensor with a cell constant of 0.1, made of Titanium, a Wet-Tap Valve and a Temperature sensor.

G. 750 SERIES II RANGE SELECTION GUIDE

CONDUCTIVITY/TDS & RESISTIVITY

Add Range NUMBER below to instrument model number, i.e. 758II-"112" = 0-50 ppm Digital Monitor/controller .

756II, 757II, 758II & 759II

RANGE

Resistivity

0-20 MΩ 0-10 MΩ† 0-5 MΩ† 0-2 MΩ 0-1 MΩ† 0-500 KΩ† 0-200 KΩ

Conductivity

0-1 µS*† 0-1 ppm*† 0-2 µS*† 0-2 ppm*† 0-5 µS*† 0-5 ppm*† 0-10 µS† 0-10 ppm† 0-20 µS 0-20 ppm 0-50 µS 0-50 ppm 0-100 µS 0-100 ppm 0-200 µS 0-200 ppm 0-500 µS 0-500 ppm 0-1000 µS 0-1000 ppm 0-2000 µS 0-2000 ppm 0-5000 µS†† 0-5000 ppm†† 0-10,000 µS/0-10 mS†† 0-10,000 ppm/0-10 ppt†† 0-20,000 µS/0-20 mS†† 0-20,000 ppm/0-20 ppt†† 0-50,000 µS/0-50 mS**†† 0-50,000 ppm/0-50 ppm**†† 0-100 mS**†† 0-100 ppt**†† 0-200 mS**†† 0-200 ppt**††

*CS51LC conductivity sensor (0. 1 constant) required for these ranges. **CS52 conductivity sensor (10.0 constant) required for these ranges. † Available in Digital models only. †† Available with 4 1/2 Digit Backlit LCD. Other ranges available as OEM ONLY. Price & delivery on request. Except as noted, Conductivity/TDS Monitor/controllers require a sensor with a cell constant of 1.0. The Model CS51 is the most commonly selected sensor due to its ease of use and low cost. Resistivity Monitor/controllers require a sensor with a cell constant of 0.05. The Model CS10 is the most common selected due to its ease of use and low cost. NOTE: UNLESS ppm/NaCl is specified with order, TDS/ppm type conductivity instruments will be calibrated to the Myron L "442™" Natural Water standard. For NaCl ppm/ppt add the letter "N" after the number, i.e. -124N.

CONDUCTIVITY/TDS

Dash #

-101

-102

-103

-104

-105

-106

-107

-108

-109

-110

-111

-112

-113

-114

-115

-116

-117

-118

-119

-120

-121

-122

-123

-124

-125

-126

-127

-128

-129

-130

-131

-132

-133

-134

751II, 752II, 753II & 754II

RESISTIVITY

Dash #

-11

-12

-13

-14

-15

-16

-17

II. INSTALLATION

A. GENERAL

This section provides the recommended procedures for properly installing the 750 Series II Conductivity/Resistivity Monitor/controller, and sensors. For OEM models see section C.

CAUTION - READ FOLLOWING CAREFULLY

WARNING: THE MYRON L COMPANY RECOMMENDS THAT ALL MOUNTING AND ELECTRICAL INSTALLATIONS BE PERFORMED BY QUALIFIED PERSONNEL ONLY. FAILURE TO DO SO COULD CAUSE DAMAGE TO INSTRUMENT, AND COULD BE HARMFUL OR FATAL TO PERSONNEL.

B. MECHANICAL INSTALLATION

All Monitor electronics are packaged inside drip/weather-proof housings. The physical dimensions of the housing is suitable for panel, bench or surface mounting.

There are four basic guidelines to consider when selecting a Monitor's mounting location:

1. Select a site that limits the Monitor's exposure to excessive moisture and corrosive fumes.

2. For best results, position your Monitor/controller and sensor as close as possible to the point(s) being controlled. The 750 Series II Conductivity/TDS & Resistivity Monitor/controllers are not designed to operate with a Sensor cable length that exceeds 100' (30 meters).

3. If at all possible, mount the Monitor at eye level for viewing convenience.

4. If needed, the enclosure may be rotated or mounted upside down so that the cutouts are on the opposite side.

1. SURFACE MOUNTING WITH SMP

NOTE: A Surface Mounting Plate (SMP50) may be required when

access to the back side of the mounting site is impractical or if

4.80

(122)

0.88 DIA (22)

1.13 DIA (29)

the Monitor/controller must be mounted on a solid wall. The SMP50 comes with the proper hardware to mount the Monitor/controller to the SMP, however, the installer must provide the four (4) additional screws/bolts to mount the SMP to the wall or fixture. Their size is to be determined by the user.

1. Select your mounting location. Mark and drill the four (4) required mounting holes. For hole locations, use the SMP as a template.

2. Drill the corner holes in the SMP according to the size of the screws or bolts selected.

3. Attach and securely fasten the SMP to the Monitor using the 1/4" X 20 X 3/8" screws provided.

4. Mount the SMP to the prepared site using the selected screws or bolts.

2. SURFACE MOUNTING WITHOUT SMP

NOTE: Surface mounting will require two (2) 1/4 " X 20 screws of

a length equal to the thickness of the mounting site plus 3/8"

1. Select mounting site location. Mark and drill the required mounting holes. For hole drilling locations, see figure II.B.1.

2. Insert the 1/4" X 20 screws into the holes from the side opposite the mounting site.

3. Hold the Monitor in place while starting and tightening the mounting screws.

3. PANEL MOUNTING

A panel mounting fastening kit is provided with all Monitor/controllers. Panel mounting will require the use of the fastening kit's two (2) 4-40 mounting screws/nuts or two (2) #4 x 1/2" sheet metal screws. See figure II.B.1. for panel cutout dimensions.

1. Select your mounting location. Mark the appropriate

panel cutout and complete the necessary panel cut.

2. Carefully unfasten and separate the Monitor's front panel

from its enclosure.

3. Disconnect all panel cable(s)/wires from the Monitor's

Control board.

DOUBLE INSULATED

0.31 DIA, X2 (8)

0.53 (14)

0.13 RAD MAX, X4 (3)

3.96

(101)

750 II

MICROSIEMENS / CM

SET POINT

3.89 (99)

5.00

6.00

(152)

MYRON L COMPANY

HIGHLOW

0.63 THK (16)

0.50 DIA (13)

0.75 (19)

Figure II.B.1.

0.60 DIA (15)

3.78 (96)

4.94

(126)

SURFACE AND PANEL MOUNTING DIAGRAMS

SURFACE

MOUNT

3.10 (79)

NOT TO SCALE

DIMENSIONS IN INCHES

(MILLIMETERS)

2.84 (72)

1.05 (27)

0.40 (10)

(127)

PANEL

CUTOUT

4.17

(106)

0.113 (3)

2.54 (64)

0.11 (3)

4. Slide the enclosure through the panel cutout until its flange contacts the panel.

5. Insert mounting screws through the flange mounting holes and tightly secure.

6. Reconnect all panel cable(s)/wires and resecure the front panel.

C. OEM MECHANICAL INSTALLTION

This section provides the recommended procedures for properly installing the OEM 750 Series II Conductivity/Resistivity Monitor/controller.

NOTE: Mounting of the OEM monitor/controller circuit board is left up to the OEM. It is recommended that the following be noted and observed.

1. CIRCUIT BOARD

Total heigth of CB is 1.40” (36mm). The circuit board has four .175” (4.4 mm) holes for mounting. The centers are 3.10” (78.7 mm) x 4.10” (104.1 mm) see figure II.C.1. CB must be mounted on at least .250” (6.35 mm) standoffs to prevent shorting to metal chassis (standoffs user supplied). CB must be mounted in a clean and dry environment. Allow working room for inserting wires, testing and calibration. Indicator lights and switches require 1/4” (6.35mm) holes.

1.880

(47.75)

2.218 Dia.

56.34

.940

Analog Meter Hole Pattern

Figure II.C.2

2. METER MOVEMENT

Refer to figure II.C.2 for dimensions.

1. Cut opening in user panel.

2. Drill four holes at locations as shown.

3. Install meter movement using supplied hardware.

.125 X4

(3.125)

.940

(23.88)

.940

(23.88)(23.88)

4.100

(104.1)

3.100

(78.74)

Figure II.C.1

2.390

(60.71)

.980

(24.89)

Digital Display Cutout Pattern

Figure II.C.3

4.585

(116.5)

3. DIGITAL DISPLAY

Refer to figure II.C.3 for dimensions.

1. Cut opening in user panel

2. Install LCD with brackets supplied.

3.600

(91.44)

D. SENSOR INSERTION/IMMERSION MOUNTING

E. ELECTRICAL INSTALLATION

The electrical installation procedures provided in this manual are common to all Conductivity & Resistivity Monitor/controllers. See figure II.B.1. for the hole dimensions of the enclosure's cable access holes. Unless otherwise instructed, refer to figure II.E.1.

for the 750 Series Monitor's terminal block connector wiring designations. NOTE: After removing an enclosure's access hole cutout, it is suggested that the user mount a watertight restraint fixture prior to installing a cable.

WARNING !

The Sensor’s mounting orientation must provide a continuous and adequate circulation flow to prevent the trapping of air bubbles within the Sensor’s electrode area (CS51 shown in figure II.D.1). Failure to do so will result in conditions that will prevent the Sensor from functioning properly.

1. INSERTION MODE (in-line installation)

Use approved sealant, i.e. Teflon tape as required.

1. Verify that the Sensor’s Fitting assembly is properly assembled as shown in figure II.D.1.

2. Insert the Sensor Fitting assembly into the "T" fitting with electrode aligned as shown in figure II.D.1. and tightly secure.

SECURING NUT

FLANGE

CABLE

INSERTION MODE ASSEMBLY

WASHER

"T" FITTING

PLASTIC

WASHER

O-RING

THREADED FITTING

3/4" FNPT

OUT

Figure II.D.1

2. IMMERSION OR DIP SENSOR ASSEMBLY

Use approved sealant, i.e. Teflon tape as required.

A device to disconnect the Model 750 from the power supply is required. It is recommended that this switch or circuit breaker be labeled as the

disconnection device for the Model 750

1. MAIN INPUT POWER INSTALLATION WARNING: All AC line powered Monitor/controllers are factory set for 115 VAC. Before starting, ensure the input power “115/230” selection is correct for your requirements. Failure to do so is beyond the responsibility of the Myron L Company. See section II.E.2. below and figure II.E.1. NOTE: Some models may have either a 24 VAC or a 24 VDC input power requirement - check labels carefully.

For OEM models skip to step #7.

1. Verify that the main AC power source is turned "OFF " or disconnected.

2. Using a standard slot screwdriver remove the two (2)

screws on the front panel.

3. Carefully wiggle the front panel to loosen the gasket and

pull gently toward you. Do not pull more than about 8 inches/20CM or you could damage the wiring harness.

1. Verify that the Sensor’s Fitting assembly is properly assembled as shown in figure II.D.2.

2. Insert and pull the Sensor’s cable through the extension tube and then tightly attach extension tube to Sensor assembly as shown in figure II.D.2.

PLASTIC

SECURING NUT

SENSOR TIP

IMMERSION OR DIP SENSOR ASSEMBLY

WASHER

O-RING

COUPLING

3/4" NPT

THREADED FITTING

3/4" FNPT

FLANGE

EXTENSION TUBE

CABLE

Figure II.D.2

(+) (-)

NEU GRN RED WHT BLK

{

COM NO NC

L N

FUSE

ALARM CONTROL RELAY

MAIN INPUT POWER

GND-GRN NEU-WHT/-DC

{

HOT-BLK/+DC

115/230 SWITCH

ELECTRICAL CONNECT DIAGRAM

Figure II.E.1

0-10VDC

}

OUTPUT

SENSOR

}

CHASSIS GROUND for OEM INSTALLATIONS ONLY

4. Turn the front panel around so that the back side is

facing you and set aside for now.

5. Carefully remove front panel, leaving the harness connected.

6. Using the enclosure cutouts, install the proper wire and watertight cable restraint (not provided) to comply with local electrical codes.

7. Neatly connect wires to the Main Circuit Board connectors, as shown in figure II.E.1.

*CAUTION: The input power connectors require only a small screwdriver or a pen to push on the release levers. The release levers may be broken or damaged if not pushed straight toward the circuit board. DO NOT push the release levers sideways.

2. 115/230 VAC CONVERSION

1. Before turning power on to the Monitor/controller ensure

the proper input voltage has been selected. Failure to do so will blow the fuse. It could, under some conditions, cause injury and damage the instrument voiding the warranty.

2. Locate switch located next to the fuse holder.

3. Using a screwdriver, turn switch to required voltage.

3. CONNECTING THE SENSOR CABLE

For OEM models skip #1.

1. Place the Sensor’s interface cable and user supplied

watertight cable restraint into the enclosure's appropriate access hole.

2. Install the sensor cable wire to comply with local

electrical codes. Follow the color code as marked. See figure II.E.1.

*CAUTION: The sensor connectors require only a small screwdriver or a pen to push on the release levers. The release levers may be broken or damaged if not pushed straight toward the circuit board. DO NOT push the release levers sideways.

Requirements: For Conductivity/TDS; one 10k may be ordered from the Myron L Company. For Resistivity; one 100k resistor, user supplied or may be ordered from the Myron L Company.

NOTE: When opening instrument, remove front cover with care; a ribbon cable connects the front panel and main board. If the front panel has all ready been removed from the enclosure skip to #4.

1. Using a standard slot screwdriver remove the two (2) screws on the front panel.

2. Carefully wiggle the front panel to loosen the gasket and pull gently toward you. Do not pull more than about 8 inches/20CM or you could damage the wiring harness.

3. Turn the front panel around so that the back side is facing you and set aside.

4. For Conductivity/TDS Monitor/controllers; a. If sensor is installed, locate and remove the RED

(RD) and the GREEN (GN) leads from MAIN Circuit Board, as shown in figure II.E.2.

b. Cut off or tape RED (RD) and the GREEN (GN) leads

from sensor.

SENSOR LEADS

BK WT RD GN NU R- R+

 1% resistor, user supplied or

 1% resistor, and one 5.49K 1%

REMOVE THESE TWO LEADS

0-10VDC OUTPUT

FULL SCALE PUSH TO TEST

HYS1SP1FS SW

a. MODIFICATION FOR US PHARMACEUTICAL 25 (No Temperature Compensation)

This simple modification will allow your Monitor/controller to meet the USP 25 requirements by defeating the normal temperature compensation circuit thus giving “uncompensated” readings as required.

Specifications: As required to meet USP25.

Installation

Briefly For Conductivity/TDS, a resistor is installed in place of the sensor “temperature” sensing leads. For Resistivity, two resistors are installed in place of the sensor “temperature” sensing leads. The extra sensor leads are either cut off or the ends are wrapped in tape to prevent shorting.

CAUTION - READ FOLLOWING CAREFULL

WARNING: BEFORE STARTING, IF MONITOR/ CONTROLLER IS INSTALLED, ENSURE THE POWER IS OFF. FAILURE TO DO SO COULD CAUSE DAMAGE TO THE INSTRUMENT, AND COULD BE HARMFUL OR FATAL TO PERSONNEL. ONLY QUALIFIED PERSONNEL SHOULD INSTALL OR SERVICE ELECTRICAL EQUIPMENT.

CAL

}

INC

DIS

-121

2000µS

Conductivity/TDS Main CB Assembly

Figure II.E.2

c. Install 10k

(GN) connector locations, as shown in figure II.E.3.

For Resistivity Monitor/controllers;

a. If sensor is installed, locate and remove the

GREEN (GN), RED (RD), and the NEUTRAL (NU) leads from MAIN Circuit Board, as shown in figure II.E.4.

b. Cut off or tape GREEN (GN), RED (RD), and the

NEUTRAL (NU) leads from sensor.

c. Install 100k

(GN) connector locations, as shown in figure II.E.5.

 resistor at RED (RD) and the GREEN

 resistor at BLACK (BK) and GREEN

SPC

DEC

d. Install 5.49kΩ resistor at RED (RD) and the

NEUTRAL (NU) connector locations, as shown in figure II.E.5.

5. Carefully reinstall the front panel, bottom first. Ensure no wires have been pinched between enclosure and front panel.

6. Reinstall the two (2) screws and tighten.

7. To operate, turn power ON.

NOTE: Recalibration will require both the solution and sensor be

at 25°C for maximum accuracy.

SENSOR LEADS

INSTALL 100K RESISTOR HERE

BK WT RD GN NU R- R+

FS SW

SENSOR LEADS INSTALL 10K

RESISTOR HERE

BK WT RD GN NU R- R+

FS SW

CAL

Conductivity/TDS Main CB Assembly

Figure II.E.3

SENSOR LEADS

REMOVE THESE THREE LEADS

BK WT RD GN NU R- R+

FS SW

CAL

Resistivity Main CB Assembly

Figure II.E.4

4. SOLID STATE OUTPUT

24 VDC Unregulated 30mA max. The following instructions are assuming the Monitor/controller enclosure is already open.

a. Piezo Electric Alarm - PA/PAO (option)

For additional information, see Piezo Alarm under Options in section III.I.

1. If not already installed, peel tape backing from PIEZO and press into place per figure III.I.3.

2. Attach connector to main control circuit board per figure III.I.4.

NOTE: If remotely mounted; cut wires and splice as necessary, use comparable wire. Piezo requires 1/4” (6.35mm) hole in user panel.

INSTALL 5.49K RESISTOR HERE

CAL

Resistivity Main CB Assembly

Figure II.E.5

b. Remote Alarm - RA™ (option)

For additional information,see RA Instructions under options in section III.J.

1. Run user supplied #22, 2 conductor speaker type wire from Monitor/controller to RA location as necessary.

Additional wire may be ordered, part #RAW-200, see

Options & Accessories.

2. Open the RA by removing the four screws.

3. Locate and remove the 8” 2 conductor wire attached to RA.

4. At the controller, connect the extension wires to the 8” 2 conductor wire with the wire nuts provided — Black to Positive (+) and White to Negative (-). Be sure to first pass the wire through the user supplied waterproof strain

relief in the enclosure.

5. Plug the reddish brown female connector into the male

connector on the controller CB marked either RA or PA (see inside case label for location). It will only go on the

connector one way.

6. At the RA, connect the wires to the connector — Black to Positive (+) and White to Negative (-).

7. To test, simply turn on the controller and adjust controller set point until the alarm/piezo sounds off. If controller is not yet connected to a functioning sensor, on

conductivity/TDS controllers it will be necessary to press

and hold the Full Scale test switch. The black button on the front of the RA will mute the piezo alarm for approximately three minutes or until you improve the water quality (readjust controller set point). The piezo alarm will continue to sound off every three minutes until the user has improved the alarm condition inside the controller. If three minutes muting is fine for

your application, skip to step 9.

8. If three minutes is too long or too short, adjust time delay control inside RA until desired mute time is achieved

adjustable from approximately 6 seconds to 10 minutes).

9. Replace the bottom of the RA, and secure RA to the

surface you have selected for its installation.

NOTE: If the RA does not sound off;

1. Check the polarity of the extension wire connections.

2. Be sure the controller is actually switching (relay will click).

c. Connect to your own alarm or ?

Use the following as guidelines.

Connector is a standard 2 wire Methode* style

connector. Connector with 8” wires, part #RAH, is available from the Myron L Company.

Ensure your requirements do not exceed the 24VDC

Unregulated 30mA maximum.

Ensure the polarity is correct (RED is positive), see

figure V.A.1. Attach wires to RA. Attach connector to controller connector (RA) per figure V.A.1.

MONITOR/CONTROLLER CIRCUIT BOARD

115VAC POWER

SOURCE

115 to 24VAC

TRANSFORMER

COM

*Methode is registered trademark of Methode Electronics, Inc.

5. ALARM/CONTROL RELAY CONNECTIONS

Myron L Company Monitor/controllers are equipped with a “Dry Contact” relay which is designed to energize/de-energize when the set point is crossed. (See section IV.C.3) for set point adjustment procedure) The relay energizes on increasing or decreasing readings as set by the user, see section IV.C.1. When energized (above set point), the Common (COM) will disconnect from the Normally Closed (NC) contact and connect to the Normally Open (NO) contact. Devices may be operated using either the Normally Open contact or Normally Closed contact; or both relay contacts may be used to control two devices of the same voltage. NOTE: A flow switch may be installed (electrically connected) utilizing one of two convenient methods; the 3S connection, see figure II.E.2, (remove jumper and connect flow switch across terminals - 8” harness (RAH) available from the Myron L Company), or inline with either relay connection, see figure II.E.6 or II.E.7.

WARNING: CONNECTING BOTH POWER SOURCE LEADS TO THE RELAY TERMINAL BLOCK CONNECTERS WILL DAMAGE THE CIRCUIT BOARD AND MAY CAUSE PERSONAL INJURY.

1. Place the user supplied Alarm relay interface cable and watertight cable restraint into the enclosure's appropriate access hole. Skip for OEM.

2. Neatly connect the relay interface cable wires to the Monitor/controller's terminal block connectors, see figures II.E.1, II.E.6 or II.E.7.

POWER

MONITOR/CONTROLLER CIRCUIT BOARD

SOURCE

DEVICE

RELAY

TERMINAL BLOCK

OPT.

FLOW

SWITCH

TO BE

CONTROLLED

Figure II.E.7

CAUTION: The connectors require only a small screwdriver or a

pen to push on the release levers. The release levers may be broken or damaged if not pushed straight toward the circuit board. DO NOT push the release levers sideways.

The easiest method of connecting the relay is shown in figures II.E.1, and II.E.6. These show how the dry contact relay can use incoming power to activate a controlled device (alarm, solenoid valve, etc.) of 10 amps or less.

For 24 VAC applications, the Myron L Company offers a 115 VAC to 24 VAC transformer, Model #VR, see figure II.E.7. Other voltages must be user-supplied.

6. CONNECTING DISPLAY HARNESS TO DISPLAY

If the installation required the removal of the display harness from the display (OEM installation requires connection), the following procedure will ensure it is reinstalled without damaging the display.

WARNING: THE DISPLAY WILL BE IRREPARABLY DAMAGED IF THE HARNESS IS INSTALLED UPSIDEDOWN OR MISALIGNED. THE HARNESS MUST BE INSTALLED AS SHOWN IN FIGURE II.E.8.

1. Grasp connector and align wires DOWN on display or with the small edge of the display as shown in figure II.E.8.

2. Press connector onto display pins. Ensure pins are aligned or they may become bent. Wiggle connector slightly “end to end” if necessary.

RELAY

TERMINAL BLOCK

Figure II.E.6

COM

OPT.

FLOW

SWITCH

DEVICE

TO BE

CONTROLLED

DISPLAY

DISPLAY CONNECTION

DISPLAY HARNESS

PANEL MOUNTED DISPLAY

REAR VIEW

Figure II.E.8

F. 0-10 VDC RECORDER OUTPUT

The 0-10 VDC output is designed to give the user the capability of sending a signal to a remote meter, recorder, PLC or SCADA system.

1. CONNECTION

1. Place the user supplied interface cable and watertight cable restraint into the enclosure's appropriate access hole. Skip for OEM.

2. Connect the Recorder's plus (+) and minus (-) terminal wires to the Recorder output connectors. (See figure II.E.1.)

3. Refer to Section V.C.1.b for the procedures to calibrate the 0-10 VDC voltage output.

0-10V Output

Figure II.F.1

Recording Device

2. VOLTAGE DIVIDER

A voltage divider gives the user the ability to scale or tailor the output to a particular need or requirement due to the input of another device, i.e. the output of the Main CB is 0-10V while the input requirement of a particular recording device is 0-5V.

a. INSTALLATION

Briefly— Two resistors are installed across the 0-10V output. The output is recalibrated to required voltage.

Requirements

Select two (2) resistors as listed;

For 0-5V Output both "A & B" are 2K Resistors. For 0-1V Output "A" is a 9K resistor and "B" is a 1K resistor.

CAUTION - READ FOLLOWING CAREFULLY

Physical

If the front panel has all ready been removed from the enclosure skip to #3.

1. Using a standard slot screwdriver remove the two (2)

screws on the front panel.

2. Carefully wiggle the front panel to loosen the gasket and

pull gently toward you. Do not pull more than about 8 inches/20CM or you could damage the wiring harness.

3. Turn the front panel around so that the back side is

facing you and set aside for now.

4. Solder two selected resistors together as shown in figure

II.F.1.

5. Attach leads to recording device as shown in figure

II.F.1.

6. Attach resistors to 0-10V Output as shown in figure

II.F.2. Ensure resistors and leads DO NOT short to each other or to any part of the CB assembly.

7. Recalibration is required, see Calibration Procedures,

section V.C.

NEW OUTPUT AS

SENSOR LEADS

BK WT RD GN NU R- R+

- +

SELECTED

0-10VDC OUTPUT

FS SW

CAL

Main CB Assembly

Figure II.F.2

Reassembly

1. Carefully reinstall the front panel, bottom first, ensure no wires have been pinched.

2. Reinstall the two (2) screws and tighten.

3. To operate, turn power ON.

G. RE-RANGE YOUR MONITOR/CONTROLLER

(Range Module Installation)

1. DESCRIPTION

The 750 Series II Monitor/controllers have been designed for easy field re-rangeability. The Range Module consists of a 16 pin Header that plugs into a 16 pin socket.

For available ranges, see Range Selection Guide I.G. When making large range changes, i.e. 5000 ppm to 50 ppt, a different sensor may also be required as noted in the Range Selection Guide. Order Range Module by adding the prefix “RM” to the range number as in examples below.

Conductivity/TDS Range Modules —

RMXXX i.e. = RM121 is a 0-2000µS

Resistivity Range Modules —

RMXX i.e. = RM11 is a 0-20MΩ

NOTE: Some OEM models may not be re-ranged being originally manufactured with a fixed range. If your application requires reranging an OEM model, first contact the system manufacture for help. The Myron L Company may re-range or exchange your instrument at a cost.

screws on the front panel.

2. Carefully wiggle the front panel to loosen the gasket and pull gently toward you. Do not pull more than about 8 inches/20CM or you could damage the wiring harness.

3. Turn the front panel around so that the back side is facing you and set aside.

4. Locate and remove existing Range Module from MAIN Circuit Board, as shown in figure II.G.1. It is not easy to remove, it was designed to stay in place under adverse conditions.

5. With the pointer up, carefully align the new Range Module to the socket on the MAIN Circuit Board as shown in figure II.G.1.

6. Press firmly into place.

7. For analog models, add multiplier label to front panel. See figures II.G.10 and II.G.11 for suggested locations. In some cases changing the meter scale will be necessary. See Changing Analog Meter Scale, section II.G.3.

8. Recalibrate, see CALIBRATION PROCEDURES, section V.C.

0-10VDC OUTPUT

BK WT RD GN NU R- R+

FULL SCALE PUSH TO TEST

2. INSTALLATION

Briefly The new Range Module simply replaces the Range Module presently installed, see figure II.G.1. Multiplier label is added to analog models*. Type label may be required if changing from Microsiemens to Millisiemens or PPM/PPT. The Full Scale reading is recalibrated.

IMPORTANT NOTES:

1. When changing ranges on Digital Monitor/ controllers with the -45 option (4 1/2 digit backlit display), the following modifications may be required to the range module; RM123 thru 128 and RM16 require pin number 9 be removed or bent toward the side, see Fig. II.G.2. On RM117 thru 122 a jumper wire must be soldered to the RM, see Fig. II.G.3. *2. Analog Monitor/controllers may require a scale change. See section II.G.3 for the specific instructions.

POINTER

CAUTION - READ FOLLOWING CAREFULLY

Physical NOTE: When opening instrument, remove front cover with care;

a ribbon cable connects the front panel and main board. If the front panel has already been removed from the enclosure skip to #4.

1. Using a standard slot screwdriver remove the two (2)

REMOVE PIN #9

Figure II.G.2

FSSW

CAL

}

RANGE

-121

TRANSFORMER

115/ 230

MONITOR/CONTROLLERS ONLY

MODULE

2000µS

751 756 752 757 753 758 754 759

MYRON L

COMPANY

FUSE*

AC C GD NC NO CM

Main CB Assembly

Figure II.G.1

ADD JUMPER CONNECTING PINS 7 & 10

RANGE MODULE

Bottom View

DIGITAL 4 1/2 DIGIT LCD

HYS1SP1

SPC

INC

DIS

DEC

SECOND RELAY

REMOVE TO INSTALL

CHS

Figure II.G.3

PA RA

GND

3. CHANGING ANALOG METER SCALE (DIAL)

After changing ranges on an analog model 750II it may be necessary to change the meter scale (dial). The following steps will guide you through the change. Please read caution carefully.

CAUTION - READ FOLLOWING CAREFULLY

screws holding the scale (dial). See figure II.G.7.

6. To remove the scale, lightly press on bottom of scale, the top will lift up. Be extremely careful not to bend the

pointer (needle) or to move the Zero Adjust (ZA).

See figure II.G.7.

Exercise extreme caution while working on meter. Meter movement, and/or pointer (needle) may be damaged beyond repair. It is recommended only qualified personnel change scales. DO NOT allow dust to enter the case while it is open. Failure to follow these instructions may cause irreparable damage, and will VOID the warranty.

Briefly The meter is removed from front panel (except OEM models). The cover is removed. The hexscrews retaining the scale are removed, and scale is slid out the top. New scale is slid in place, and screws reinstalled. Cover aligned, installed and zero set.

Physical

For OEM models skip to #4.

1. Using a wrench, nut driver or pliers remove the two (2) large nuts retaining the circuit board wiring harness connectors. Red wire is PLUS (+), Brown wire is MINUS (-). See figure II.G.4.

2. Using a standard slot screwdriver remove the four (4) screws, and the backing plate holding the meter to the front panel as shown in figure II.G.4.

3. Remove meter. Do not lose the gasket between the meter and the front panel it must be reinstalled upon reassembly. See figure II.G.5. Align gasket to front panel so as the gasket does not show when meter is assembled to front panel.

Backing Plate

Mounting Screws (4)

METER

BROWN WIRERED WIRE

Harness to Main CB Connector

Figure II.G.4

Pry Here Carefully

CLEAR COVER

GASKET

Figure II.G.5

4. Using a wide blade standard slot screwdriver, starting at a bottom corner, CAREFULLY pry the clear plastic cover loose from the movement case. See figure II.G.6.

5. Using a 1/8” (3.2mm) hexdriver, remove the two (2) small

CASE

Figure II.G.6

7. Grasp top and slide scale slowly out from top. Be extremely careful not to bend the pointer (needle) or to move the Zero Adjust (ZA). See figure II.G.7.

8. Reverse the above procedure using the new scale.

NOTE: While replacing the clear plastic cover, ensure the ZA screw pin on the cover aligns with the inverted “Y” shaped slot on the meter movement. See figure II.G.7. IF, the inverted “Y” shaped slot is inadvertently moved - BEFORE installing cover:

a. Recenter the inverted “Y” to the meter case as

shown in figure II.G.7.

b. Center the Zero Adjust (ZA) PIN on the clear

plastic cover as shown in figure II.G.8.

9. Using a standard slot screwdriver, ensure the ZA is operating - pointer swings left and right when turning the ZA with a standard slot screwdriver. See figure II.G.9.

10. Set Meter ZERO as shown in figure II.G.9.

11. Reinstall meter to front panel, reversing steps 1-3 (except OEM models).

Grasp Scale Here and Slide Out TOP

SCALE (dial)

Align Pointer with FIRST Line

Pointer (needle)

1/8" (3.18mm) Hex Screws (2)

Press Lightly Here

METER CASE

Inverted "Y"

Figure II.G.7

4. LABEL CHANGE

Since you have re-ranged your Monitor/controller it may be necessary to relabel it. If you made any one of the following changes it will be necessary to “add or change” the designator label on the Front Panel. Pick the correct label and apply to the Front Panel as shown in figure II.G.10. If there is an overlay label already in place remove it and clean the surface with isopropyl alcohol (rubbing alcohol) before installing the new label. A clean surface will allow the new label to adhere to the surface better.

1. Did you change from µS to mS, PPM or PPT?

2. Did you change from mS to µS, PPM or PPT?

3. Did you change from PPM to PPT, µS or mS?

4. Did you change from PPT to PPM, µS or mS?

5. Do you need to install a Multiplier label as in figure II.G.11.

CLEAR PLASTIC COVER

(case not shown for clarity)

Multiplier Label (X1000 example)

FRONT PANEL

ZERO ADJUST under rubber plug.

Figure II.G.10

Zero Adjust (ZA)

Figure II.G.9

MICROSIEMENS / CM

750II

SET POINT

X1000

MYRON L

COMPANY

HIGH

LOW

HIGHLOW

CENTER Zero Adjust (ZA) PIN

CLEAR PLASTIC COVER

(Inside View)

Figure II.G.8

REASSEMBLY

1. Carefully reinstall the front panel, bottom first, ensure no wires have been pinched.

2. Reinstall the two (2) screws and tighten.

3. To operate, turn power ON.

SCALE (dial)

Multiplier Label (X1000 example)

X1000

OEM ANALOG METER

Figure II.G.11

III. OPTIONS &

ACCESSORIES

A. SC/SCO MODULE

(SECOND ALARM/CONTROL OPTION)

(Digital & OEM Models ONLY)

-SC Second Alarm Control Module ordered with Monitor/controller.

SCO Second Alarm Control Module Kit ordered separately.

1. DESCRIPTION:

An essential component for applications requiring a DUAL setpoint. The Second Alarm/control module allows the user additional flexibility by being able to sound TWO Alarms, and Control TWO functions with the second 10 amp relay. The set points are non-overlapping. The #2 alarm/control (HIGH set point) rides on top of the #1 alarm/control (LOW set point). SCO kit comes with all items necessary to install and operate: SC Module, front panel harness with LED, switch, bezel, cap and two o-rings (006 & 008); and replacement lower front panel label (L2ALARM).

Specifications: Control Function:

Setpoint control continuously adjustable 0-100% of span

Hysteresis:

Adjustable from 0.3-3% of full scale

Indicators:

Above (red) and below (green) setpoint LEDs (reversible)

Relay Contact Rating:

SPDT 10 amp ~ 250 VAC, 30 VDC. Relay operates increasing or decreasing reading (selectable)

Solid State Output:

Powered — 24VDC 30mA Maximum

2. INSTALLATION:

Briefly The Second Alarm/control module plugs into the main Monitor/controller circuit board. The LED/switch harness is installed into the front panel. Set point and hysteresis are set per “your“ requirements. If this option is installed, skip to III.A.2.a.

SET POINT #2 CONVERSION

CAUTION - READ FOLLOWING CAREFULLY

Physical

If the front panel has all ready been removed from the enclosure skip to #3. MAIN Circuit Board

1. Using a standard slot screwdriver remove the two (2) screws on the front panel.

2. Carefully wiggle the front panel to loosen the gasket and pull gently toward you. Do not pull more than about 8 inches/20CM or you could damage the wiring harness.

3. Turn the front panel around so that the back side is facing you and set aside for now.

4. Remove BLACK JUMPER from MAIN Circuit Board connector located next to the transformer as shown in figure III.A.2.

NOTE: Do not lose BLACK JUMPER. It must be reinstalled if

second relay is removed for any reason and the #1 relay is expected to operate.

5. Carefully press the SCO Second Alarm/Control Module into MAIN Circuit Board as shown in figure III.A.4. When fully seated the SCO Module will snap into place.

6. Connect the Solid State output to PA or user supplied 24VDC/30mA alarm/valve or ??, and/or control wires to relay #2, as required, see figure III.A.4*. a. Place the control cable and user supplied

watertight cable restraint into the enclosure's appropriate access hole.

b. Neatly connect the control wires to the

Monitor/controller’s appropriate connectors. See figure III.A.4.

*CAUTION: The relay connectors require only a small screwdriver or a pen to push on the release levers. The release levers may be broken or damaged if not pushed straight. DO NOT push the release levers sideways.

LED/SWITCH HARNESS

SET POINT #2 HYSTERESIS

RUBBER TAPE (DO NOT REMOVE MUST BE IN PLACE TO PREVENT SHORT)

SPC

INC

CM NO NC

SOLID STATE OUTPUT (24VDC 30mA) PIEZO ELECTRIC ALARM - PA™ OR REMOTE ALARM - RA™ OR CUSTOMER CONNECTION

OPTIONAL SECOND ALARM/CONTROL MODULE

Figure III.A.1

SET POINT #2 (high) ADJUST

NC NO

COM

}

RELAY #2

Front Panel

WARNING: there are two (2) o-rings installed on the switches, one (1) on the shank and the other is under the push button. Both of these o-rings must be reinstalled to maintain IP64/NEMA 3 ratings. See figure III.A.3.

1-4 assumes this is a conversion from a single alarm/control. Skip to #5 if new installation or assembly.

1. Carefully remove the RED LED from the front panel by pulling lightly on the wires. It may be necessary to use a small flat screwdriver to slightly spread the retaining ring.

2. Remove the set point switch from the front panel by rotating the round bezel nut CCW on the front panel, see figure III.A.4.

3. Remove the LOWER front label.

4. Clean off remaining adhesive, if possible with alcohol.

5. Install DUAL alarm LOWER label, P# L2ALARM.

6. Install the SCO Second Alarm/Control RED LED in the UPPER position as shown in figures III.A.5 & III.A.6.

FULL SCALE PUSH TO TEST

BK WT RD GN NU R- R+

SET POINT #1 (low) ADJUST

HYS1SP1FS SW

7. Install the SCO Second Alarm/Control Set Point Switch in the UPPER center position.

8. Re-install #1 (original) Set Point Switch in the LOWER center position.

9. Re-install the #1 (original) RED LED in the LOWER position.

10. The GREEN LED stays in the same location.

a. Set Point Conversion (SPC) /

Reversing Set Point

The alarm/control circuit(s) on all 750 Series II Conductivity/TDS Monitor/controllers are configured to trigger the alarm relay as the Conductivity/TDS reading increases.

NOTE: On Resistivity Monitor/controllers the reverse is true, as the reading decreases the alarm/control will trigger/sound.

If the user's application requires it, the alarm/control circuit may be easily reconfigured to trigger the alarm/control relay as the Conductivity (or ppm) reading decreases, or increases for Resistivity. Refer to figure III.A.4 for the locations of the SPC jumpers referred to in this section.

SET POINT #1 HYSTERESIS RIGHT INCREASING / LEFT DECREASING

SWITCH

BEZEL NUT

PUSH BUTTON

}

-121 2000µS

751 756 752 757 753 758 754 759

MYRON L

COMPANY

TRANSFORMER

115/ 230

POWER

Figure III.A.2

AC NEUTRAL

{

CAL

FUSE*

AC HOT

DIS

AC C GD NC NO CM

GROUND

NC NO

INC

SPC

DEC

SECOND RELAY

REMOVE TO INSTALL

CHS

COM

PA RA

GND

}

O-RING

FRONT PANEL

Switch / O-ring Assembly

Figure III.A.3

SET POINT #1 CONVERSION

REMOVE JUMPER TO INSTALL SC/SCO SECOND ALARM/CONTROL MODULE

SOLID STATE OUTPUT (24VDC 30mA) PIEZO ELECTRIC ALARM - PA™ OR REMOTE ALARM - RA™ OR CUSTOMER CONNECTION

RELAY #1

O-RING

+ 51 hidden pages

Myron L 756II, 757II, 758II, 759II, 751II Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual