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Resistivity Monitor / Controllers

Resistivity Monitor / Controllers

751II, 752II, 753II, 754II Series

750 Series II Resistivity Monitor / Controller
The unique circuitry of our 750 Series II Resistivity Monitor/controllers guarantee accurate and reliable measurements. Drift free performance is assured by "field proven" electronics, including automatic DC offset compensation and highly accurate drive voltage.

Since temperature compensation is at the "heart" of accurate water measurement, all Myron L Monitor/controllers feature a highly refined and precise TC circuit. This feature perfectly matches the water temperature coefficient as it changes. All models corrected to 25°C. Uncompensated models available to conform with USP 25.

A push-to-test button makes setpoint checks easy, while the internal alarm set discourages unauthorized adjustments.

Standard on all controller models is a heavy-duty 10 amp output relay, operating on either increasing or decreasing readings. Bright green/red LEDs indicate above/below setpoint readings.

All 750 Series II models feature an IP64/NEMA 3 splash and corrosion proof rated enclosure while being a compact size at 6x4.8 inches (15.2x122 mm). They are suitable for panel, bench or surface mounting.

Accessories include a 3 Sensor input, a 3 Range switch (both installed separately from the monitor/controller), and a RA™ - Remote Alarm.
Custom and OEM Models available. Contact us with your requirements.

Features
Seven Ranges: 0-200 Kilohms to 0-20 Megohm-cm
Choice of analog meter or 3½ digit LCD
Automatic temperature compensation to 25°C
0-10 VDC Recorder Output
IP65/NEMA 4X water resistant & corrosion proof enclosure
Single setpoint/alarm
Adjustable setpoint hysteresis
24VDC Solid state output
10 amp relay operates on choice of increasing or decreasing reading
LED's show "above/below" alarm/control status
Push-to-test set point check
Internal set point discourages unauthorized adjustment
Selectable 115/230 VAC
Reliable, easily installed sensor
CE Approved
Options Include
Second Alarm/control Module
4-20 mA Isolated Output
Piezo Electric Alarm
3½ Digit Backlit Display
Temperature Module
24 VAC and 24 VDC Isolated Power

To order 750 Series II Resistivity Monitor/controllers

Model

Range

Options
751 II: Analog (monitor only)
752 II: Analog (monitor/controller)
753 II: Digital (monitor/controller)
754 II: Digital (monitor only)

See Resistivity Range Chart Below
-SC Second Control Module (752II & 753II only)
-4A 4-20 mA module (753II & 754II only)
-PA Built in 70db piezo alarm
-35BL 3 1/2 digit backlit LCD
-TP Temperature module (753II & 754II only)
Example: See price list for complete selection of options and accessories

753II

-

11

-

4A

is a digital resistivity monitor/controller with a 0-20 Megohm range and a 4-20 mA isolated output.

Resistivity Range Chart

RANGE:

SUFFIX
TO
INSTRUMENT
MODEL NO.
0 - 20 Megohm

- 11
0 - 10 Megohm

- 12
0 - 5 Megohm

- 13
0 - 2 Megohm

- 14
0 - 1 Megohm

- 15
0 - 500 Kilohm

- 16
0 - 200 Kilohm

- 17
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.

Monitor/controller Pricing
Resistivity
Part Number Model

Description
EQP-ML751 751II Resistivity Analog Monitor only
EQP-ML752 752II Resistivity Analog Monitor/controller
EQP-ML753 753II Resistivity Digital Monitor/controller
EQP-ML754 754II Resistivity Digital Monitor only

EXAMPLE:
A digital 0-20 mA Resistivity Monitor/controller with a 4-20 and a 3 1/2 digit backlit display would be:
MODEL
753II		 RANGE
-11		 OPTIONS
-4A-35BL		 TOTAL PRICE

Options
SC Second Alarm/Control Module (Monitors/Controllers only)
4A 4-20 mA Self-Powered isolated output module (Digital only)
PA 70db Piezo Electric Alarm (mounted on front panel) -(digital Monitor/controllers only)
PAT Piezo Alarm & Timer Module (digital Monitor/controllers only)
45BL 4 1/2 Digit backlit Liquid Crystal Display (LCD)
35BL 3 1/2 Digit backlit Liquid Crystal Display (LCD)
TP Temperature Module 0-200°C, requires - TP sensor (Digital only)
TH TP/TPO Alarm/controller Harness only (requires SC & TP above) (digital Monitor/controllers only)
PC Power Cord 115 VAC (8 FT. with plug and strain relief) NOT for 230 VAC use
Special Order Options
24VA 24 VAC Isolated Power Supply
24VD 24 VDC Isolated Power Supply
PTS Panel Mounted test Switch
SFP Panel mounted set point adjustment (digital Monitor/controller only
TPA Temperature Module 0-200°C, Above - TP with adjustable hysteresis (digital models only)

HT

 High temperature modification for -HT sensors , range limited (Contact technical sales)

Accessories

Part Number

 Model Description
EQP-MLASI ASI Aquaswitch I fully automatic DI bank system
(Monitor/controller only)I
EQP-MLSCO SCO Second Alarm/Control Module
EQP-ML4AO 4AO 4-20 mA self-powered isolated output module
(digital only)
EQP-ML3SO 3SO 3 Sensor Input Module with 3 ft/1 Meter cable
(customer mounted)
EQP-ML3SE 3SE 3 Sensor Input Module with Enclosure
EQP-ML3RO 3RO 3 Range Switch with 3 ft/1 meter cables
(Add C=Cond or R=Res)
EQP-ML3RE 3RE 3 Range Switch with enclosure R=Res)
EQP-ML3SRO 3SRO Above 3SO and 3RO combined R=Res)
EQP-ML3SRE 3SRE Above 3SO and 3RO with enclosure R=Res)
EQP-MLPAO PAO 70db Piezo Electric Alarm Only
(digital Monitor/controllers only)
EQP-MLPATO PATO Piezo Alarm & Timer Module
(digital Monitor/controllers only)
EQP-ML35BLO 35BLO 3 1/2 Digit Backlit Liquid Crystal Display (LCD)
EQP-ML45BLO 45BLO 41/2 Digit Backlit Liquid Crystal Display (LCD)
EQP-MLTPO TPO Temperature Module 0-200°C, requires - TP sensor (digital only) w/harness
EQP-MLTHO THO TP/TPO Alarm/controller Harness only
(requires SCO & TPO above)
EQP-MLTPC TPC Calibration Module (Temperature Module)
EQP-MLPCO PCO Power Cord 115 VAC (8 FT. with plug and
strain relief) NOT for 230 VAC use
EQP-MLSMP50 SMP50 Surface Mounting Plate
EQP-MLRA RA Remote Alarm - RA™ (controller models only)
EQP-MLVR VR Power Supply, 24 VAC, 20 VA (115 VAC,
indoor use only)
EQP-ML024-1 024-1 1 in NPT 24 VAC Solenoid Valve
EQP-MLCS-11 CS-11 20 Megohms Resistivity Calibration Module
Sensor substitute ) NIST traceable
EQP-MLCS-14 CS-14 2 Megohms Resistivity Calibration Module
Sensor substitute ) NIST traceable
EQP-MLCS-17 CS-17 200 Megohms Resistivity Calibration Module
Sensor substitute ) NIST traceable
EQP-MLRC RC NIST Certificate without sensor R=Res)
EQP-MLRCATF RCATF NIST Certificate with out sensor. order after instrument has shipped
(C = Cond or R = Res
EQP-MLCCS CCS NIST Certificate with sensor using Standard Solutions (Conductivit/TDS only)
* Does not fit into enclosure, must be mounted separately.

Sensors shown here

Sensors:
All Resistivity models require a CS10 series sensor. This reliable sensor features 2 integral thermistors to ensure accurate and rapid automatic temperature compensation. The sturdy polypropylene standard bushing is modular for easy, inexpensive replacement. A PVDF or 316 stainless steel bushing can also be ordered. The metal portion is available in either 316 stainless steel (standard) or titanium.

Special Order CS41, High Temperature/High Pressure sensor available upon request.

resistivity, sensor, monitor, controller, meter

 Specifications:
Constant: 0.05
Temperature Compensation: 2 Integral thermistors provide automatic TC to 25°C between 32-212°F (0-100°C).
Pressure/Temp Limits: 100psi (690kPa) @ 212°F (100°C).
Bushing: Modular Polypropylene threaded 3/4" NPT. 1/2" PVDF or 316 stainless steel fittings available as options.
Wetted Materials: Electrodes: 316 stainless steel (standard) or titanium.
Cable: 10' (3 meters) is standard. 25' and 100' (8 and 30 meters) lengths available.
Dimensions: Metal portion 1.2" (30 mm) long; 0.5" (13mm) diameter; Overall length 3.6" (91mm)


Additional Information

Operation Manual click here: PDF

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