CONDUCTIVITY MONITOR/CONTROLLERS Installation • Operation • Maintenance User Manual for Models: 755, 756, 757, 758, 767 2450 Impala Drive Carlsbad, CA 92010-7226 USA Tel: 1-760-438-2021 Fax: 1-800-869-7668 / 1-760-931-9189 www.myronl.
TABLE OF CONTENTS SECTION PAGE 1 INTRODUCTION 1.1 SCOPE ......................................................................................................................................................... 1 1.1.1 Functional Descriptions ................................................................................................................. 1 1.1.2 Applications ...................................................................................................................................
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.
1.3 CONDUCTIVITY CELLS 1.5 HOW TO ORDER MONITOR/CONTROLLERS 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. EXAMPLE: CS52 cells have a 10.0 constant and are used for conductivity values above 20,000µS. 1.3.
Conductivity/ppm Ranges CS51 SERIES CELLS SUITABLE FOR ALL EXCEPT THOSE NOTED RANGE 0-2 µS *** 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 0-10,000 ppm 0-20,000 µS 0-20,000 ppm 0-20 mS 0-20, 200, 2,000 µS 0-20, 200, 2,000 ppm 0-50, 500, 5,000 µS 0-50, 500, 5,000 ppm 0-100, 1,000, 10,000 µS 0-100, 1,000, 10,000 ppm 0-200, 2,000, 20,000 µS 0-200, 2,000, 20,000 ppm 0-500, 5,000, *50,000 µS
SECTION 2 Installation 2.1 GENERAL 2.2 MECHANICAL INSTALLATION This section provides the recommended procedures for properly installing the 750/760 Series Conductivity Monitors and cells. All Monitor electronics are packaged inside drip/weather-proof housings. The physical dimensions of both small and large housings are suitable for panel, bench or surface mounting.
NOTE: The 750/760 Series Conductivity Monitors are not designed to operate with a Cell cable length that exceeds 100' (30 meters). STEP 3 If at all possible, mount the Monitor at eye level for viewing convenience. 2.2.1 SURFACE MOUNTING WITH SMP ASSEMBLY NOTE: A Surface Mounting Plate (SMP) will be required when access to the far side of the mounting site is impractical. For 750 series monitors, use the SMP-50 and for 760 series monitors, use the SMP-60.
2.4 ELECTRICAL INSTALLATION The electrical installation procedures provided in this manual are common to all Conductivity Monitors. See Fig. 2-1 for the hole dimensions of the enclosure’s cable access holes. Unless otherwise instructed, refer to Fig. 2-4 and 2-5 for the 750/760 Series Monitor’s terminal block (TB) connector wiring designations. NOTE: After removing an enclosure’s access hole plug, it is suggested that the user mount a watertight restraint fixture prior to installing a cable. 2.4.
2.4.2 220 VAC CONVERSION 2.5 0-10 VDC RECORDER OUTPUT STEP 1 Verify that the facility’s main AC power source is turned “OFF” or disconnected. STEP 1 Place the user supplied interface cable and watertight cable restraint into the enclosure’s appropriate access hole. STEP 2 Locate and remove the Control board jumpers E1 and E3. (See Fig. 2-6.) STEP 3 Using one of the removed jumpers, insert it into jumper E2’s connection holes as shown in Fig. 2-6.
SECTION 3 Operating Procedures 3.1 SWITCH AND INDICATOR CONTROLS The front panel illustrations, switch and indicator operational descriptions have been provided to assist the user in identifying and operating the 750/760 Series Conductivity Monitors. Refer to Section 3.3 for a Monitor’s Setup procedures and Section 3.4 for Check-Out procedures. 3.1.1 RED “ABOVE SET POINT” LED INDICATOR Standard on all models except the 756 small Monitor.
3.2 MODEL 767 STANDARD AND OPTIONAL FEATURES This section describes the standard and optional features of the Model 767 Conductivity Monitor/Controller. (Refer to Fig. 3-1.) Power Supply The standard Monitor/Controller has a single power supply that provides voltages for all circuit functions. It may be configured for either a 110 VAC or a 220 VAC supply. Conductivity The conductivity circuit is designed as a three range device with extremely accurate tracking between ranges.
3.3.1 DECREASING SET POINT CONVERSION 3.4.1 MODEL 755 (Only) The alarm circuit(s) on all 750/760 Series Conductivity Monitors are configured to trigger the alarm relay as the conductivity (or ppm) reading increases. If the user’s application requires it, the alarm circuit may be easily reconfigured to trigger the alarm relay as the conductivity (or ppm) reading decreases. Refer to Fig. 4-1 for the locations of the jumpers referred to in this section.
SECTION 4 Component Identification/Calibration and Preventive Maintenance 4.1 PRIMARY COMPONENT IDENTIFICATION As identified in Section 3, the Conductivity Monitors’ switch and indicator components are mounted directly to the front panel. The Conductivity Monitors’ Control boards are contained within and mounted to the back of the enclosure. The 767 Monitor, when equipped with the 3 Cell Input option, has a second component board mounted on the back of the front panel.
4.2 METER MECHANICAL ZERO PROCEDURES 4.3.2.1 MODEL 755 Models 756, 757 & 767 (Analog Meters Only) STEP 1 Turn OFF or disconnect the Monitor’s main AC power. STEP 1 Connect a voltmeter (0-10 VDC) to the Recorder output terminals TB2-6 & 7 with the positive (+) lead on TB2-7. STEP 2 Note the position of the meter needle. If it has come to rest pointing at the zero mark on the scale, turn the Monitor back ON and continue on the Section 4.3. STEP 2 Press and hold the Calibration Test switch (SW1).
STEP 4 While holding the Calibration Test switch to its TEST position, set the Front Panel Meter trimmer (R25) to indicate a full scale reading on the front panel meter. If the Monitor/Controller is equipped with the Remote Meter option, adjust the Remote Meter trimmer (R28) in the same manner. 4.3.5 MODEL 767 EQUIPPED WITH THE 420D OPTION For this calibration procedure, the Monitor/Controller must be connected to a conductivity sensor with the white and black wires disconnected.
WARRANTY All Myron L monitors and cells have a two-year warranty. If any monitor or cell fails to function normally, return the faulty unit to the factory prepaid. If, in the opinion of the factory, failure was due to materials or workmanship, repair or replacement will be made without charge. A reasonable service charge will be made for diagnosis or repairs due to normal wear, abuse or tampering. Warranty is limited to the repair or replacement of monitor or cell only.
