Myron L 755, 756, 757, 758 Instruction Manual

CONDUCTIVITY

MONITOR/CONTROLLER

Installation • Operation• Maintenance

User Manual for Models 755 756 757 758

6115 Corte del Cedro Carlsbad, CA 92009-1516 USA Tel [phone]

Fax [phone] www.myronl.com

pH/Conductivity Instrumentation

Accuracy • Reliability • Simplicity

TABLE OF CONTENTS

SECTION

PAGE

1INTRODUCTION

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

2INSTALLATION

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
	2.7.2 Connecting the RM Option ............................................................................................................		7

3OPERATING PROCEDURES

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

4COMPONENT IDENTIFICATION, CALIBRATION AND PREVENTIVE CARE

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

4.4PREVENTIVE CARE

5APPENDIX

A

REPLACEABLE COMPONENTS CHART .................................................................................................

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SECTION 1

Introduction

1.1SCOPE

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.

1.1.2APPLICATIONS

1 Reverse Osmosis

2 Process Control

3 Seawater Desalinization

4 Waste Treatment

5 Food Processing

6 Power Plants

7 Laboratories

1.2SPECIFICATIONS

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 1/2" (63mm) analog meter

Model 758: 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)

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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 20,000 S. 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 20,000 S.

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 0-2000 S 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 0-2 S range

CS51:	For ranges 20 to 20,000 S or ppm
CS52:	For ranges above 20,000 S 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
	INSTRUMENT	ONLY	MONITOR	MONITOR/	MONITOR/	MONITOR/
RANGE	MODEL NO.			CONTROL	CONTROL	CONTROL
0-2 S ***	-6				X
0-20 S	-9	X	X	X	X
0-20 ppm	-10	X	X	X	X
0-50 S	-11		X	X	X
0-50 ppm	-12		X	X	X
0-100 S	-13	X	X	X	X
0-100 ppm	-14	X	X	X	X
0-200 S	-15		X	X	X
0-200 ppm	-16		X	X	X
0-500 S	-17	X	X	X	X
0-500 ppm	-18	X	X	X	X
0-1000 S	-19	X	X	X	X
0-1000 ppm	-20	X	X	X	X
0-2000 S	-21	X	X	X	X
0-2000 ppm	-22	X	X	X	X
0-5000 S	-23		X	X	X**
0-5000 ppm	-24		X	X
0-10,000 S	-25		X	X	X**
0-10,000 ppm	-26		X	X
0-20,000 S	-27		X	X	use-29**
0-20,000 ppm	-28		X	X
0-20 mS	-29				X
0-20, 200,
2,000 S	-30					X
0-20, 200,
2,000 ppm	-31					X
0-50, 500,
5,000 S	-32					X
0-50, 500,
5,000 ppm	-33					X
0-100, 1,000,
10,000 S	-34					X
0-100, 1,000,
10,000 ppm	-35					X
0-200, 2,000,
20,000 S	-36					X
0-200, 2,000,
20,000 ppm	-37					X
0-500, 5,000,
*50,000 S	-38					X
0-500, 5,000,
*50,000 ppm	-39					X
*0-50,000 S	-40		X	X
*0-50,000 ppm	-41		X	X
*0-100,000 S	-42		X	X
*0-200,000 S	-44		X	X
*0-200 mS	-46				X

*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