Myron L 755, 756, 757, 758 Instruction Manual
CONDUCTIVITY
MONITOR/CONTROLLER
Installation • Operation• Maintenance
User Manual for Models 755
756
757
758
767
6115 Corte del Cedro
Carlsbad, CA 92009-1516 USA
Tel 760-438-2021
Fax 800-869-7668 / 760-931-9189
www.myronl.com
pH/Conductivity Instrumentation
Accuracy • Reliability • Simplicity
TABLE OF CONTENTS
SECTION PAGE
1 INTRODUCTION
1.1 SCOPE......................................................................................................................................................... 1
1.1.1 Functional Descriptions ................................................................................................................. 1
1.1.2 Applications ................................................................................................................................... 1
1.2 SPECIFICATIONS ....................................................................................................................................... 1
1.3 CONDUCTIVITY CELLS .............................................................................................................................. 2
1.3.1 Cell Specifications ......................................................................................................................... 2
1.4 OPTIONAL FEATURES ............................................................................................................................... 2
1.4.1 Accessories................................................................................................................................... 2
1.5 HOW TO ORDER ........................................................................................................................................ 2
2 INSTALLATION
2.1 GENERAL .................................................................................................................................................... 4
2.2 MECHANICAL INSTALLATION.................................................................................................................... 4
2.2.1 Surface Mounting with SMP Assembly .......................................................................................... 5
2.2.2 Surface Mounting without SMP Assembly ..................................................................................... 5
2.2.3 Panel Mounting .............................................................................................................................. 5
2.3 CELL INSERTION / DIP MOUNT ASSEMBLIES ......................................................................................... 5
2.3.1 Insertion Mode Assembly .............................................................................................................. 5
2.3.2 Alternate Dip Cell Assembly .......................................................................................................... 5
2.4 ELECTRICAL INSTALLATION ..................................................................................................................... 6
2.4.1 Main AC Power Installation............................................................................................................ 6
2.4.2 220 VAC Conversion ..................................................................................................................... 6
2.4.3 Connecting the Cell Cable ............................................................................................................. 7
2.4.4 Alarm Relay Installation ................................................................................................................. 7
2.5 0-10 VDC RECORDER OUTPUT ................................................................................................................ 7
2.6 CONNECTING THE MODEL 758 4-20 mA AND 420D OPTIONS ............................................................... 7
2.7 INSTALLATION OF THE MODEL 767 OPTIONS ........................................................................................7
2.7.1 Connecting the 420D Option ......................................................................................................... 7
3 OPERATING PROCEDURES
4 COMPONENT IDENTIFICATION, CALIBRATION AND PREVENTIVE CARE
5 APPENDIX
2.7.2 Connecting the RM Option ............................................................................................................ 7
3.1 SWITCH AND INDICATOR CONTROLS ..................................................................................................... 8
3.1.1 Red “Above Set Point” LED Indicator ............................................................................................ 8
3.1.2 Green “Below Set Point” LED Indicator ......................................................................................... 8
3.1.3 Set Point Adjustment Knob ............................................................................................................ 8
3.1.4 “Set Point Check” Switch ............................................................................................................... 8
3.1.5 Analog / Digital Meter Readouts .................................................................................................... 8
3.1.6 Three “Range” Select Switch ......................................................................................................... 8
3.1.7 Three “Cell” Select Switch ............................................................................................................. 8
3.2 MODEL 767 STANDARD AND OPTIONAL FEATURES.............................................................................. 9
3.3 SETUP PROCEDURES ............................................................................................................................. 10
3.3.1 Decreasing Set Point Conversion ................................................................................................ 10
3.3.2 Set Point Adjustment ................................................................................................................... 10
3.4 CHECK-OUT PROCEDURES ................................................................................................................... 10
3.4.1 Model 755 (Only) ......................................................................................................................... 10
3.4.2 Models 756, 757, 758 & 767 ........................................................................................................ 10
4.1 PRIMARY COMPONENT IDENTIFICATION ..............................................................................................11
4.2 METER MECHANICAL ZERO PROCEDURES......................................................................................... 12
4.3 CALIBRATION PROCEDURES ................................................................................................................. 12
4.3.1 Calibration Procedures using Standard Solution ......................................................................... 12
4.3.2 Calibration Procedures (Circuit Only) .......................................................................................... 12
4.3.2.1 Model 755 .................................................................................................................. 12
4.3.2.2 Models 756, 757 & 758 .............................................................................................. 12
4.3.3 Model 758 with 4-20mA or 420D Options .................................................................................... 12
4.3.4 Model 767 .................................................................................................................................... 13
4.3.5 Model 767 Equipped with the 420D Option ................................................................................. 13
4.4 PREVENTIVE CARE
A REPLACEABLE COMPONENTS CHART ................................................................................................. 14
SECTION 1
Introduction
1.1 SCOPE
This manual provides the user with the necessary information to
install, operate and maintain the Myron L Company’s 750/760
Series Conductivity Monitors. Sections 1 through 3 provide Monitor
applicational descriptions, mounting, wiring and operational
procedures. Section 4 identifies their primary components and
provides the user with easy-to-use calibration and preventive care
procedures.
Section 5 (Appendix A) provides the 750/760 Series Monitor’s
Replaceable Components Chart.
1.1.1 FUNCTIONAL DESCRIPTIONS
All models have drip/weather-proof housings suitable for panel,
bench or surface mounting. The 750 models are a compact 6.0"
(152mm) x 4.8" (122mm). The 767 model is 6.0" (152mm) x 10.8"
(275mm).
Bright green/red LEDs indicate below/above set point readings.
All models except 756 feature a heavy-duty 10 amp output relay,
operating on either increasing or decreasing readings.
For specific Monitor configurations, reference the following
individual model descriptions.
Model 755
Small controller only. Provides a front panel accessible set point
adjustment knob in place of an analog or digital meter readout
display.
Model 756
Small monitor only. Standard front panel is equipped with a linear
analog meter display only (no relay, LED indicators or set point
check switch).
Model 757
Small analog monitor/controller. Single set point is internal to
discourage unauthorized adjustments. Standard front panel is
equipped with a linear analog meter display and a “SET POINT
CHECK” switch.
Model 758
Small digital monitor/controller. Single set point is internal to
discourage unauthorized adjustments. Standard front panel is
equipped with a digital LCD meter display and a “SET POINT
CHECK” switch.
Model 767
Large analog monitor/controller. Single set point is internal to
discourage unauthorized adjustments. Standard front panel is
equipped with a three (3) range select switch, analog meter display
and a “SET POINT CHECK” switch. Options include three (3) cell
input capability and dual set point control.
1.1.2 APPLICATIONS
1 Reverse Osmosis
2 Process Control
3 Seawater Desalinization
4 Waste Treatment
5 Food Processing
6 Power Plants
7 Laboratories
1.2 SPECIFICATIONS
RANGES:
Refer to Conductivity/ppm Ranges sheet on Page 3 for
Conductivity Ranges.
READOUT:
Model 756: 2 1/2" (63mm) analog meter
Model 757: 2
Model 758:
1
/2" (63mm) analog meter
1
/2" (13mm) 3 1/2 digit LCD
Model 767: 4 1/2" (114mm) analog meter
ACCURACY:
Model 758: ± 1 % of span
Other Models: ± 2% of span
SENSITIVITY:
0.05% of span
STABILITY:
0.05% of span
REPEATABILITY:
0.1% of span
CALIBRATION CHECK:
Built in
RECORDER OUTPUT:
0-10 VDC @ 5mA max. (linear); standard on all models
CELL INPUT:
1 (optional 3 Cell Input available on Model 767)
RELAY FUNCTION:
Models 755, 757, 758 and 767:
Single set point control continuously adjustable 0-100% of
span
Indicators:
“ABOVE” (red) and “BELOW” (green) set point LEDs
Contact Rating:
SPDT 10 amp @ 250 VAC, 30 VDC. Relay operates
increasing or decreasing reading (selectable).
Optional on Model 767 only:
Dual set point control, with above specifications
POWER SPECIFICATIONS:
115 VAC ± 15%, 50/60 Hz, 25 mA
220 VAC (User changeable)
DIMENSIONS 750 SERIES:
6.0" (152mm) H x 4.8" (122mm) W x 3.8" (96mm) D
DIMENSIONS 760 SERIES:
6.0" (152mm) H x 10.8" (275mm) W x 3.9" (99mm) D
AMBIENT TEMPERATURE RANGE:
-22°F (- 30°C) to 140°F (60°C)
HOUSING CONSTRUCTION:
Fully gasketed heavy-duty ABS for corrosion resistance. Rated
NEMA type 3.
WEIGHT:
750 Series: 2 Ibs. (0.9 kg)
760 Series: 3 Ibs. (1.4 kg)
1
1.3 CONDUCTIVITY CELLS
Both 750 and 760 series conductivity models use the CS51 or
CS52 Series cell. The 1.0 cell constant CS51 model is
recommended for ranges of 0-20 through 20,000µS. Its compact
size allows mounting in the top of a standard 3/4" tee. The
sturdy polypropylene bushing is modular for easy, inexpensive
replacement.
CS52 cells have a 10.0 constant and are used for conductivity
values above 20,000µS.
1.3.1 CELL SPECIFICATIONS
CONSTANT:
CS51LC: 0.1
CS51: 1.0
CS52: 10.0
TEMPERATURE COMPENSATION:
Automatic to 25°C, between 32-212°F (0-100°C)
PRESSURE/TEMPERATURE LIMITS:
100 psi (689.6 kPa) at 212°F (100°C)
BUSHING:
CS51 (LC): Modular Polypropylene threaded 3/4" NPT
CS52: 316 stainless steel 3/4" NPT internal to cell body
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
CS52: Contact factory for specifications
1.4 OPTIONAL FEATURES
-03: 3 cell input (767 only)
-420: 4-20 mA isolated output (758 only)
-420D: 4-20 mA self powered isolated output (758, 767 only)
-DP: Dual set point (767 only)
-RM: Remote meter (767 only)
1.4.1 ACCESSORIES
MODEL TYPE
PC: 110V Power cord (8 foot with plug and strain relief
fitting)
SMP50: Surface mounting plate for 750 series
SMP60: Surface mounting plate for 760 series
60AM: 4 1/2" analog meter for 767-RM (specify range)
3CE: 3 cell switch with enclosure and trimplate
1.5 HOW TO ORDER MONITOR/CONTROLLERS
EXAMPLE:
This is a small digital monitor/controller with a 0-2000µS range
and 4-20mA output.
NOTE:
Monitor model number does not include cell. Please specify
cell required when ordering.
MODEL TYPES:
755: Small controller only
756: Small analog monitor only (no relay)
757: Small analog monitor/controller
758: Small digital monitor/controller
767: Large 3-range analog monitor/controller
RANGE SUFFIXES:
See CONDUCTIVITY/ppm RANGES sheet, Page 3.
1.5.1 HOW TO ORDER CELLS
CS51 LC: For 0-2µS range
CS51: For ranges 20 to 20,000µS or ppm
CS52: For ranges above 20,000µS or ppm see
CONDUCTIVITY/ppm RANGES sheet, Page 3.
CELL CABLE SUFFIX
-25: 25' (7 meters) shielded cell cable
-100: 100' (30 meters) shielded cell cable
2
Introduction
Conductivity/ppm Ranges
CS51 SERIES CELLS SUITABLE FOR ALL EXCEPT THOSE NOTED
SUFFIX 755 756 757 758 767
TO CONTROL ANALOG ANALOG DIGITAL LG. ANALOG
RANGE MODEL NO. CONTROL CONTROL CONTROL
0-2 µS *** -6 X
0-20 µS-9 X X X X
0-20 ppm -10 X X X X
0-50 µS-11 X X X
0-50 ppm -12 X X X
0-100 µS -13 X X X X
0-100 ppm -14 X X X X
0-200 µS -15 X X X
0-200 ppm -16 X X X
0-500 µS -17 X X X X
0-500 ppm -18 X X X X
0-1000 µS -19 X X X X
0-1000 ppm -20 X X X X
0-2000 µS -21 X X X X
0-2000 ppm -22 X X X X
0-5000 µS -23 X X X**
0-5000 ppm -24 X X
0-10,000 µS -25 X X X**
0-10,000 ppm -26 X X
0-20,000 µS -27 X X use-29**
0-20,000 ppm -28 X X
0-20 mS -29 X
0-20, 200,
2,000 µS -30 X
0-20, 200,
2,000 ppm -31 X
0-50, 500,
5,000 µS -32 X
0-50, 500,
5,000 ppm -33 X
0-100, 1,000,
10,000 µS -34 X
0-100, 1,000,
10,000 ppm -35 X
0-200, 2,000,
20,000 µS -36 X
0-200, 2,000,
20,000 ppm -37 X
0-500, 5,000,
*50,000 µS -38 X
0-500, 5,000,
*50,000 ppm -39 X
*0-50,000 µS -40 X X
*0-50,000 ppm -41 X X
*0-100,000 µS -42 X X
*0-200,000 µS -44 X X
*0-200 mS -46 X
INSTRUMENT ONLY MONITOR MONITOR/ MONITOR/ MONITOR/
*CS52 SERIES CONDUCTIVITY CELLS REQUIRED FOR THESES RANGES
** READS IN MILLISIEMENS (mS)
*** CS51LC CELL (0.1 constant) REQUIRED FOR THIS RANGE
NOTE: UNLESS ppm/NaCl is specified with order, ppm type conductivity instruments will be calibrated on the
Myron L “442” Natural Water™ standard
3
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