Myron L Aquaswitch II User Manual

Water Quality Instrumentation

Accuracy • Reliability • Simplicity

AQUASWITCH I

&

AQUASWITCH II

Operation

Manual

24 August 05

INSTALLATION • OPERATION • MAINTENANCE

Resistivity Model: ASIIR

Conductivity/TDS Model: ASIIC

ACCURACY • RELIABILITY• SIMPLICITY

AQUASWITCH I & II™

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.

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.5.

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 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
AQUASWITCH including sensor information.

INSTALLATION - Section II.

This section covers how to install your new AQUASWITCH;
mechanically and electrically.

OPTIONS & ACCESSORIES - Section III.

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

QUICK LOCATOR

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

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

-TP/TPO (Temperature Module, see section III.C.
RA (Remote Alarm), see section III.D.

OPERATING PROCEDURES - Section IV.

This section covers a brief description of the 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.B.1.

Resistivity AQUASWITCH II‘s are configured to trigger the
alarm relay as the resistivity reading decreases.
Conductivity/TDS AQUASWITCH II’s are configured to trigger
the alarm relay as the conductivity/TDS reading increases.
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.

It is assumed that the AQUASWITCH power is ON, that it is
connected to an appropriate Sensor, and that the Sensor is
immersed in water within the range that the AQUASWITCH II
will be required to control; 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.

Continued

QUICK SET POINT ADJUSTMENT -

See Section IV.B.2.

The set point setting is based upon the user's particular water
purity specifications or requirements.

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.B.3.

ELECTRONIC CALIBRATION (CIRCUIT ONLY) -

See Section V.D.1.

Full Scale Calibration V.D.1.a.

1. Press and hold the Full Scale Test switch. The display
should indicate Full Scale for the particular range
selected, i.e. 0-20 MΩ should indicate 20. 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.

PRIMARY COMPONENT IDENTIFICATION -

Section V.A.

Review the figure below to familiarize yourself with the different
circuit boards and component locations. The diagram has the
second alarm/control module option installed.

“PURGE CYCLE” CALIBRATION PROCEDURE

Section V.B.

“ALARM RESET” MODE CHANGE PROCEDURE

Section V.C.

QUICK CALIBRATION - Section V.D.

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.

AQUASWITCH II

AQUASWITCH II MAIN MONITOR/CONTROLLER BOARD

BK WT RD GN NU R- R+

RANGE
MODULE

3S

}

UP

-11

0-20mΩ

751 756
752 757
753 758
754 759

MYRON L
COMPANY

TRANSFORMER

115/
230

FUSE*

CALIBRATION
CONTROL

CAL

PWR C GD NC NO CM

HYS1SP1FS SW

SPC

INC
DIS

DEC

REMOVE TO
INSTALL
SECOND
RELAY

AQUASWITCH II DIGITAL DISPLAY

DISPLAY

DISPLAY CONNECTOR

DISPLAY
HARNESS

DISPLAY
HARNESS
CONNECTOR

DISPLAY
CALIBRATION
CONTROL

4-20
CONNECTOR

E
N
C
L
O
S
U
R
E

F
R
O
N
T

P

RED

A
N

TO MONITOR/
CONTROLLER

E

CIRCUIT BOARD
DISPLAY
CONNECTOR

L LOW

SET POINT

SWITCH

GREEN

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

USING STANDARD SOLUTIONS - See Section V.D.2.

The BEST method of verifying and recalibrating your
conductivity/TDS AQUASWITCH II 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, such as the Myron L Ultrameter™. See
section V.C.4 for description.

SENSOR SUBSTITUTE CALIBRATION -

See Section V.D.3.

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

AQUASWITCH I

AQUASWITCH POWER BOARD

AQUASWITCH™

ALARM OUTPUT
CONNECTORS

POWER BOARD

LOGIC
BOARD
CONNECTION

RELAY

NO

COM

NC

TRANSFORMER

NCNOCOM

BK B

GRDCAC

BK A

AQUASWITCH LOGIC BOARD

BLD

STANDARD
ALARM RESET
ENABLE JUMPER

COM

WHT

BK B

115/230
JUMPERS

OR

115/230
SWITCH

FUSE*

*115/230VAC
FUSE

100mA
(T.10A) 5X20
Slow Blow/
Time Delay

*24 VAC/24 VDC
FUSE

250mA
(T.25A) 5X20
Slow Blow/
Time Delay

CABLE
CONNECTS TO
POWER BOARD

PURGE CYCLE
CONTROL

FUSE
1/8 Amp
AGC 1/8

PRIMARY COMPONENT IDENTIFICATION

Figure V.A.1

21 may 03

AQUASWITCH I

™

WATER QUALITY

BANK A

IN USE GOOD POOR

BANK B

BANK SWITCH ALARM RESET

BLEED

MYRON L
COMPANY

AQUASWITCH I™

WATER QUALITY

MEGOHMS - CM

SET POINT

BANK A

IN USE GOOD POOR

BANK B

BANK SWITCH ALARM RESET

HIGHLOW

AQUASWITCH II

™

BLEED

MYRON L
COMPANY

AQUASWITCH II™

Model ASIIR-11

(A Digital Resistivity AQUASWITCH II,

with a Range of 0-20 MΩ)

1

TABLE OF CONTENTS

SECTION PAGE

AQUASWITCH™ ILLUSTRATIONS (ASI & ASIIR-11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

I. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

A. SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

1. Functional Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

2. Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

B. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

C. OPTIONAL FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

D. ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

E. SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1. Conductivity/TDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2. Resistivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

3. Sensor Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

F. ORDER INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1. How to order AQUASWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2. How to order Sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4. Surface and Panel Mounting Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

C. SOLENOID VALVE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

D. SENSOR INSERTION / DIP MOUNT ASSEMBLIES (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

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

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

1. AQUASWITCH I Main AC Power Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2. AQUASWITCH II Main AC Power Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3. 115/230 VAC Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

4. Connecting the Sensor Cable (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

a. USP 25 Modification (No Temperature Compensation). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5. Solid State Output Connection (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

a. Piezo Electric Alarm Installation (option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

b. Remote Alarm Connection (RA option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

c. Connect to your own alarm or indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

6. Pilot Valve Solenoid Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

7. Alarm/Control Relay Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

8. Connecting Display Harness to Display (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

F. 0-10 VDC OUTPUT (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

1. Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

2. Voltage Divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

G. RE-RANGE YOUR AQUASWITCH II(Range Module Installation) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

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

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

III. OPTIONS & ACCESSORIES INSTALLATION (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

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

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

2. Installation . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

3. Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

4. Converting a Current to a Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

B. PA PIEZO ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

C. TP/TPO MODULE (TEMPERATURE OPTION) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

2

TABLE OF CONTENTS Continued

SECTION PAGE

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

a. TPC “Calibration”Module Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

b. Precision Resistor Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

c. System Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

D. RA REMOTE ALARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

1. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

2. Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

IV. OPERATING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

A. FRONT PANEL INDICATORS & CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

1. AQUASWITCH I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2. AQUASWITCH II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3. Optional Front Panel Items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

B. SETUP PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1. Set Point Conversion (SPC) or Reversing Set Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

3. Set Point Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

3. Hysteresis (Dead Band) Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

C. OPERATIONAL CHECKOUT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

1. AQUASWITCH I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

2. AQUASWITCH II . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

V. COMPONENT IDENTIFICATION, CALIBRATION AND PREVENTIVE CARE . . . . . . . . . . . . . . . . . . 35

A. PRIMARY COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

B. PURGE CYCLE CALIBRATION PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

C. ALARM RESET MODE CHANGE PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

D. CALIBRATION PROCEDURES - MAIN CIRCUIT BOARD (ASII) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

1. Electronic Calibration (Circuit Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

2. Calibration Using Standard Solution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

3. Sensor Substitute Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

4. Transfer Standard Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

E. PREVENTIVE CARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

F. ALTERNATIVE VALVING CONFIGURATIONS &

OPERATION for CONTINUOUS PROCESS WATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

VI. OPTIONS & ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

A. OPTIONS ORDERED WITH AQUASWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

B. OPTIONS & ACCESSORIES ORDERED SEPARATELY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

C. CONDUCTIVITY/TDS STANDARD SOLUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

VII. REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

VIII. WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

IX. GLOSSARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

X. NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

XI. ADDENDUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

A. CONDUCTIVITY, TDS, RESISTIVITY & TEMPERATURE RELATIONSHIPS . . . . . . . . . . . . . . . . . . . . . . 46

3

I. INTRODUCTION

Thank you for selecting one of the Myron L Company’s newest
AQUASWITCH Monitor/controllers. The new AQUASWITCH™
series 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 new
AQUASWITCH 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 AQUASWITCH, but must be to address all the variables.

A. SCOPE

This operation manual provides the user with the necessary
information to install, operate and maintain the
Myron L Company's latest AQUASWITCH Resistivity &
Conductivity/TDS Controllers.
Section I. 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

Both models have water & corrosion resistant IP64/NEMA 3
housings suitable for panel, bench or surface mounting.

The AQUASWITCH I is packaged within a compact 6.0" x 4.8"
(152mm x 122mm) housing. The AQUASWITCH II is packaged
within a 6.0" x 10.8" (152mm x 274mm) housing.
The AQUASWITCH I does not monitor water quality itself, but
should be used with any reliable resistivity or conductivity/TDS
controller such as the Myron L Company’s 750 Series II
Resistivity or Conductivity/TDS Monitor/controllers.
The AQUASWITCH II is an integrated unit requiring no other
Monitor/controller.

NOTE: All specifications for the AQUASWITCH I also apply to
AQUASWITCH II unless otherwise indicated. Bright green/red
LEDs indicate HIGH/LOW set point readings. All AQUASWITCH
II’s feature a heavy-duty 10 amp output relay, operating on either
increasing or decreasing readings. May use the optional 4-20mA
output for PLC or SCADA operations.

2. APPLICATIONS

Conductivity/TDS

Reverse Osmosis
Process Control
Seawater Desalinization
Food Processing
Plating
Power Plants
Laboratories
Printing

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

1. GENERAL ASI & ASII

INPUT POWER:

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

User replaceable

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

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

10,000 ft/3000 meters 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 - 250mA Slow Blow (T.25A) User replaceable

AQUASWITCH I:
Provides automatic switching from exhausted to fresh Dl banks;
push-button override for immediate bank change-over; adjustable
purge timer for “FAILSAFE” operation; front panel LED displays
provide continual status of both Dl banks; and an alarm is
automatically activated as each bank is depleted.

AQUASWITCH II:
AQUASWITCH II combines the operating features of the
AQUASWITCH I with the additional features of a

Monitor/controller. These include: a 3 1/2 digit Liquid Crystal
Display and a front panel accessible “SET POINT CHECK” switch.
(Set point setting is internal to discourage unauthorized
adjustments).

AMBIENT TEMPERATURE RANGE

32°F ( 0°C) to 131°F (55°C)

OUTPUT POWER:

24 VAC (Standard if ordered with Myron L valves)
115 VAC (Standard if ordered without Myron L valves)
230 VAC (Optional)

MAXIMUM LOAD PER VALVE OUTPUT:

200 milliamps;
(5 watts for a 24 V valve)
(25 watts for a 115 V valve)
(50 watts for a 230 V valve)

4

AMBIENT TEMPERATURE RANGE:

32°F (0°C) to 140°F (60°C)

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

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

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

RA™, or indicator of your own choosing.

DIMENSIONS
AQUASWITCH I:
6" (152mm) H x 4.8" (122mm) W x 3.8" (97mm) D
AQUASWITCH II:
6" (152mm) H x 10.8" (274mm) W x 3.9" (99mm) D

SHIPPING WEIGHT

AQUASWITCH I: 3 Ibs. (1.36 kg.)
AQUASWITCH II: 5 Ibs. (2.27 kg.)

ALARM RELAY CONTACT RATING:

SPDT 10 amp @ 250 VAC (Non-Inductive), 30 VDC

2. AQUASWITCH II

RANGES

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

14 Conductivity/TDS ranges from

0-1µS/µM/ppm to 0-100µS/µM/ppm

Refer to Range Selection Guide on Page 8.

DISPLAY
1/2" (13mm) 3 1/2 digit LCD. (Optional 3 1/2 digit back lit LCD)

ACCURACY

+ 1 % of Full Scale

SENSITIVITY

0.05% of span

C. OPTIONAL FEATURES

-4A 4-20 mA Isolated output (ASII)

-PA 70 db Piezo Electric Alarm (ASII)

-PAT Piezo Alarm & Timer Module (ASII)

-35BL 3 1/2 digit backlit LCD (ASII)

-PC 115 VAC Powercord (8 ft. 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 ((ASII ­special order)

D. ACCESSORIES (ordered separately)

4AO 4-20 mA Isolated output
PAO 70 db Piezo Electric Alarm ONLY (ASII)
35BLO 3 1/2 digit backlit LCD (ASII)
PCO 115 VAC Powercord (8 ft. with USA plug and strain

relief) - NOT for use with 230VAC.

SMP50 Surface Mounting Plate
RA Remote Alarm - RA™ (ASII)
VR Powersupply, 24VAC, 20VA (115VAC, indoor use)
CS-11 20 Megohm sensor substitute (NIST Traceable)
CS-14 2 Megohm sensor substitute (NIST Traceable)
CS-17 200 Kilohm sensor substitute (NIST Traceable)

STABILITY

0.05% of span

REPEATABILITY

0.1% of span

CALIBRATION CHECK

Built in full scale value

RECORDER OUTPUT

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

OUTPUT IMPEDANCE

100Ω ±5%

SENSOR INPUT
Resistivity — 1 CS10 sensor
Conductivity/TDS — 1 CS51LC sensor up to 0-10

1 CS51 sensor above 0-10

CONTROL FUNCTION

Models ASIIC & ASIIR:

Single set point alarm/control continuously adjustable

5

E. SENSORS

All sensors feature integral thermistor style temperature sensors
to ensure accurate, rapid and reliable automatic temperature
compensation.

1. CONDUCTIVITY/TDS

AQUASWITCH II Conductivity/TDS Monitor/controllers use the
CS51LC or CS51 Series sensor depending on range. The 1.0 cell
constant CS51 model is recommended for ranges of 0-10 through
100 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.
CS51LC sensor has a cell constant of 0.1 and is used for
conductivity/TDS values of 0-1 to 0-5 µS/ppm.

2. RESISTIVITY

AQUASWITCH II 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.

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.

3. SENSOR SPECIFICATIONS

STANDARD MODELS — 316 Stainless Steel CONSTANT

CS10: For ALL Resistivity ranges 0.05
CS51 LC: For ranges 0-5 µS/ppm & below 0.1
CS51: For ranges between 0-10 & 0- 100 µS/ppm 1.0

See Range Selection Guide, Page 8.

SPECIAL ORDER MODELS — 316 Stainless Steel
CS40 Resistivity/Conductivity/TDS

Valve Insertable 100PSI@150°C

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

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

Compensation 75PSI@60°C (1.0)

4. SENSOR OPTIONS

-T Titanium - in place of Stainless Steel

-25 25’ Shielded Cable

-100 100’ Shielded Cable

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

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

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

Special Order Options

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

-JB Junction Box - Class I, Group D, Div. S,
Explosion proof, Weather proof, Aluminum. For

CS40 ONLY.

TEMPERATURE COMPENSATION

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

PRESSURE/TEMPERATURE LIMITS

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

BUSHING

CS51 (LC): Modular Polypropylene threaded 3/4" NPT
CS10: Modular Polypropylene threaded 3/4" NPT

CABLE

Shielded; 10' (3 meters) standard.
25' (7 meters), and
100' (30 meters) lengths also available.

DIMENSIONS

CS51(LC): Metal portion 1.2" (30mm) L; 0.5" (13mm) DIA

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

F. ORDERING INFORMATION

1. HOW TO ORDER AN AQUASWITCH

Choose either an AQUASWITCH I or an AQUASWITCH II.
AQUASWITCH I order as - ASI

No sensor required, skip to How to Order Valve(s), if required.
AQUASWITCH II

EXAMPLE: order as -

MODEL RANGE* OPTIONS

ASIIR — 11 — 4A - PA
Written as — ASIIR-11-4A-PA

This is a Resistivity AQUASWITCH II Monitor/controller with a
0-20MΩ range, a 4-20mA output and a Piezo electric Alarm.

*RANGE SUFFIXES:

See RANGE SELECTION GUIDE, Page 8.

NOTE: AQUASWITCH II model number does not include

sensor. Please specify sensor required when ordering. See How
to Order Sensor.

See How to Order Valve(s).

2. HOW TO ORDER A SENSOR

Add option to model number as in examples below.

EXAMPLE:

MODEL OPTIONS

CS10 — TP-100
Written as — CS10-TP-100
The above is a model CS10 sensor made with Titanium, and a 100
foot cable.

EXAMPLE:

MODEL OPTIONS CS40HT —
01-T-WTV
Written as — CS40-01-T-WTV

6

The above is a Special Order High Temperature sensor with a cell
constant of 0.1, made of Titanium, and a Wet-Tap Valve.

Additional Ordering Information
NOTE: 24 VAC power is required for use with 24 VAC valves. A

115 VAC to 24 VAC step-down transformer accessory is
available.

Order Model VR

EXAMPLE of a COMPLETE SYSTEM (ASI):

1) ASI AQUASWITCH I

1) VR Power supply 115 VAC to 24VAC

4) XXXXX 24 VAC Valves (user supplied)

EXAMPLE of a COMPLETE SYSTEM (ASII):

1) ASIIR-11-PA AQUASWITCH II, 0-20MΩ range with
optional audible alarm

1) CS10-T Titanium Sensor

1) VR Power supply 115 VAC to 24VAC

4) XXXXX 24 VAC Valves (user supplied)

7

G. AQUASWITCH II RANGE SELECTION GUIDE

CONDUCTIVITY/TDS & RESISTIVITY

Add Range NUMBER below to instrument model number, i.e. ASIIR -"11" = 0-20MΩ Controller .

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

ASIIC

CONDUCTIVITY/TDS

Dash #

-101

-102

-103

-104

-105

-106

-107

-108

-109

-110

-111

-112

-113

-114

ASIIR

RESISTIVITY

Dash #

-11

-12

-13

-14

-15

-16

-17

*CS51LC conductivity sensor (0. 1 constant) required for these ranges.
Conductivity/TDS AQUASWITCH II 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 AQUASWITCH II 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. -114N.

8

II. INSTALLATION

A. GENERAL

This section provides the recommended procedures for properly
installing the AQUASWITCH I Controller, or AQUASWITCH
II Monitor/controller, Valve(s), and Sensor. Figure II.A.1 gives
an overview of the entire system. Alternate configurations on
page 39.

rotated or mounted upside down so that the cutouts are
on the opposite side.

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

AQUASWITCH II

SOURCE
WATER

MONITOR/CONTROLLER

MEGOHMS - CM

AQUASWITCH II

BANK A

DIDI DI

DIDI DI

BANK B

BANK A
PILOT VALVE

NC

NC

BANK B
PILOT VALVE

BLEED
PILOT VALVE

(NC)
WASTE WATER

750II

WASTE
WATER

AQUASWITCH I/II SYSTEMS DIAGRAM

(SEE PAGE 39 FOR ALTERNATIVE CONFIGURATIONS)

AQUASWITCH I

AQUASWITCH I

RESISTIVITY
SENSOR

PROCESS
WATER

OPTIONAL
PROCESS

PILOT VALVE
(NO)

VAC

ALARM
RELAY

Figure II.A.1.

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 AQUASWITCH 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
mounting location:

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

2. If at all possible, mount the AQUASWITCH at eye level
for viewing convenience.

3. AQUASWITCH I
If needed, the AQUASWITCH I enclosure may be

1. SURFACE MOUNTING WITH SMP

NOTE: A Surface Mounting Plate (AQUASWITCH I - #SMP50)

or (AQUASWITCH II - #SMP60) may be required when access
to the back side of the mounting site is impractical or if the
AQUASWITCH must be mounted on a solid wall. Both SMP’s
come with the proper hardware to mount the AQUASWITCH to
the SMP, however, the installer must provide the four (4)
additional screws/bolts to mount the SMP to the wall or fixture.
Their type and 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"

9

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.

AQUASWITCH I

4.80

(122)

Face Plate Gasket

Panel Gasket

0.88 DIA
(22)

1.13 DIA
(29)

3. PANEL MOUNTING

A panel mounting fastening kit is provided with all
AQUASWITCH’s. 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 figures II.B.1 & II.B.2. for panel
cutout dimensions.

1. Select your mounting location. Mark the appropriate
panel cutout and complete the necessary panel cut.

0.31 DIA, X2
(8)

0.53
(14)

0.13 RAD MAX, X4
(3)

3.96

(101)

6.00

(152)

AQUASWITCH I

6-32x3/8" x4

Face Plate Gasket
Panel Gasket

0.63 THK

3.89

(16)

(99)

AQUASWITCH II

10.81
(275)

0.50 DIA
(13)

0.5

(13)

Figure II.B.2

3.78
(96)

6.00

(152)

0.60 DIA
(15)

4.94

(126)

5.00

SURFACE

MOUNT

2.84
(72)

(127)

PANEL

CUTOUT

1.05
(27)

3.10
(79)

0.40
(10)

4.17

(106)

NOT TO SCALE

DIMENSIONS IN INCHES

(MILLIMETERS)

SURFACE AND PANEL MOUNTING DIAGRAMS

9.85

0.63 THK
(1.6)

5.00

(127)

0.50
(13)

0.75
(19)

5.00

(127)

3.75
(95)

3.77
(96)

0.31 DIA 2PL
(8)

SURFACE

MOUNT

(250)

0.113
(3)

2.54
(64)

0.11
(3)

2.00
(51)

AQUASWITCH II

0.50 DIA
(13)

9.85

(250)

Figure II.B.3

0.75
(19)

01.03 DIA 2 PL
(29)

0.68 DIA 2 PL
(22)

0.60 DIA
(15)

3.90
(99)

5.10

(129)

PANEL

CUTOUT

NOT TO SCALE

DIMENSIONS IN

INCHES

(MILLIMETERS)

DOUBLE INSULATED

SURFACE AND PANEL MOUNTING DIAGRAMS

9.92

(252)

10.19
(259)

0.12 RAD MAX 4PL
(3)

0.13 2PL
(3)

2.57
(65)

0.13
(3)

10

2. Carefully unfasten and separate the AQUASWITCH's

PILOT
VALVE

Figure II.D.2

!

front panel from its enclosure.

3. Disconnect all panel cable(s)/wires from the
AQUASWITCH's Control board.

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 reinstall the front
panel.

C. SOLENOID VALVE INSTALLATION

There are many types of solenoid valves. The user must decide
which type is best suited for the specific application. The
following is an example installation of one type of valve,

1. Insert the pilot valve unit so that the systems’ INFLOW
source and OUTFLOW process piping connecting ends
are inserted into the valve as shown in figure II.C.1.

2. Repeat step until all appropriate pilot valve units have
been installed.

NOTE: The number of pilot valves used will be based upon the
user’s desired application.

24VAC
INTERCONNECTING

MANUAL OVERRIDE

ADJUSTABLE
FLOW CONTROL

OPERATES
NORMALLY
CLOSED

WIRES

OPERATES
NORMALLY
OPEN

SECURING NUT

FLANGE

CABLE

SS

WASHER

"T" FITTING

PLASTIC

WASHER

O-RING

THREADED FITTING

3/4" FNPT

OUT

IN

INSERTION MODE ASSEMBLY

Figure II.D.1.

2. IMMERSION OR DIP SENSOR ASSEMBLY
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.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

WASHER

O-RING

THREADED FITTING

3/4" FNPT

FLANGE

INFLOW OUTFLOW

OPTIONAL INFLOW

SOLENOID VALVE MOUNTING DIAGRAM

D. SENSOR INSERTION/IMMERSION MOUNTING

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 (CS10 shown in
figures II.D.1 & II.D.2). 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

SENSOR TIP

COUPLING

3/4" NPT

CABLE

EXTENSION TUBE

IMMERSION OR DIP SENSOR ASSEMBLY

E. ELECTRICAL INSTALLATION

The AQUASWITCH I and AQUASWITCH II require the user
to follow separate electrical installation procedures. In addition,
based on the user’s solenoid voltage specifications, the user will
be required to connect Solenoid Power.

NOTE: All cable watertight restraints are user supplied.

WARNING !

11

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

1. AQUASWITCH I MAIN INPUT POWER

WARNING: All AQUASWITCH I’s 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.3. and figure
II.E.1 and II.E.2.
NOTE: Some models may have either a 24 VAC or a
24 VDC input power requirement - check labels
carefully.

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.

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

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

6. Neatly connect wires to the AQUASWITCH I's
connectors*, as shown in figures 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.
† Early versions have screw terminals.

AQUASWITCH™

INPUT FROM
CONTROLLER
RELAY

ALARM
RELAY

{

SOLENOID
VALVE
OUTPUT
POWER

POWER BOARD

LOGIC
BOARD
CONNECTION

TRANSFORMER

NCNOCOM

GRDCAC

{

BK B

BK A

BLD

NO

COM

NC

BANK B
BANK A

BLEED
COM

ASI ELECTRICAL CONNECTION DIAGRAM

115/230
JUMPERS

LINE / +DC
(BLK)

NEUTRAL / -DC
(WHT)

WHT

BLK

COM

LINE
NEUTRAL

OR

115/230
SWITCH

FUSE*

}

FUSE
1/8 Amp
AGC 1/8

MAIN
INPUT
POWER

}

SOLENOID
INPUT
POWER

Figure II.E.1

2. AQUASWITCH II MAIN INPUT POWER
WARNING: All AQUASWITCH II’s 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.3. and figure
II.E.2.

MONITOR/CONTROLLER
MAIN CIRCUIT BOARD

MAIN
INPUT
POWER
FROM AS
POWER
BOARD

{

115/230
SWITCH

NEU-WHT
LINE-BLK

L N

FUSE

Figure II.E.2

(+)
(-)

NEU
GRN
RED
WHT
BLK

0-10VDC

}

OUTPUT

}

CONTROL
RELAY

AQUASWITCH™

*115/230VAC
FUSE

100mA
(T.10A) 5X20
Slow Blow/
Time Delay

*24VAC
FUSE

250mA
(T.25A) 5X20

SENSOR

ELECTRICAL CONNECTION DIAGRAM

Slow Blow/
Time Delay

GRN
ORN
WHT

ALARM
RELAY

AQUASWITCH II™

POWER BOARD

LOGIC
BOARD
CONNECTION

NO

COM

NC

{

{

BANK B
BANK A
BLEED
COM

SOLENOID
VALVE
OUTPUT
POWER

TRANSFORMER

NCNOCOM

BK B

BK A

GRDCAC

LINE / +DC
(BLK)

NEUTRAL / -DC
(WHT)

WHT

BLD

COM

115/230
JUMPERS

BLK

LINE
NEUTRAL

OR

115/230
SWITCH

FUSE*

}

SOLENOID
INPUT

}

POWER

FUSE
1/8 Amp
AGC 1/8

MAIN
INPUT
POWER

12

The following procedures are to be used to install the
AQUASWITCH II to 115 VAC main power source. For the
procedures to install the optional 230 VAC main power source, the
user must first complete the installation procedures in Section
II.E.3. Failure to do so could result in damage to equipment and/or
property.

NOTE: Both early and later models function exactly the same.

II.E.3.a. Early Model Power Boards with

Buss Wire JUMPERS

This requires extreme care as circuit board may be damaged if
improperly attempted.

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

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

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

6. Neatly connect wires to the AQUASWITCH II's
connectors*, as shown in figures II.E.2.

*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.
† Early versions have screw terminals.

3. 115/230 VAC CONVERSION

Before turning power ON to the AQUASWITCH ensure the
proper input voltage has been selected. For the AQUASWITCH
I, see figures II.E.1 & II.E.3. This is required in TWO locations on
the AQUASWITCH II, see figures II.E.2 & II.E.3. Failure to do
so will blow the fuse(s). It could, under some conditions, cause
injury and damage the instrument voiding the warranty.
On the early model AQUASWITCH Power Board the conversion
must be accomplished by desoldering and resoldering a buss wire
jumper as shown in figure II.E.3, (to desolder and resolder the
JUMPERS, the circuit board (CB) must be removed from the
enclosure), or may be accomplished as shown in figure II.E.4.
Later models have switches, see section II.E.3.b and figure
II.E.2.

1. Locate the jumpers below the transformer.

2. Cut jumpers in location as shown in figure II.E.4.

3. Carefully, bend leads toward each other (center) as
shown in figure II.E.4.

4. Solder the ends of the leads together.

Cut and carefully bend leads toward center

115 VAC

Solder ends together

230 VAC

JUMPERS LOCATED UNDER TRANSFORMER

EARLY MODEL POWER BOARD

115/230 VAC JUMPER CONVERSION

Figure II.E.4

II.E.3.b. Later Model Power Boards with SWITCH

1. Locate switch next to the fuse holder.

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

II.E.3.c. AQUASWITCH II Main Control Board

ALL AQUASWITCH II Main Control Boards have a switch. See
figure II.E.2.

115 VAC

230 VAC

JUMPERS LOCATED UNDER TRANSFORMER

EARLY MODEL POWER BOARD

115/230 VAC JUMPER CONVERSION

Figure II.E.3

1. Locate switch next to the fuse holder.

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

4. CONNECTING THE SENSOR CABLE

This section provides the procedure to properly wiring the sensor.

1. Place the SENSOR 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.

3. Follow the color code as marked. See figure II.E.2.

*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.

13