Myron L® 750 Series II — Conductivity/TDS & Resistivity Monitor/Controllers (Category Description)
Engineered for accuracy, reliability, and simple operation, the Myron L® 750 Series II family covers both Conductivity/TDS and Resistivity measurement and control for ultrapure water, RO/DI skids, boilers, labs, process lines, and more. All models feature automatic temperature compensation to 25 °C, 0–10 VDC recorder output, a rugged IP65/NEMA 4X enclosure, built-in electronic calibration, and a heavy-duty 10-amp control relay that can operate on rising or falling readings to keep critical water quality within spec.
Models at a Glance
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Resistivity series: 751II (Analog Monitor), 752II (Analog Monitor/Controller), 753II (Digital Monitor/Controller), 754II (Digital Monitor). Ranges: 7 resistivity ranges from 0–200 kΩ to 0–20 MΩ·cm. Choice of analog meter or 3½-digit LCD (backlit optional).
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Conductivity/TDS series: 756II (Analog Monitor), 757II (Analog Monitor/Controller), 758II (Digital Monitor/Controller), 759II (Digital Monitor). Ranges: 34 conductivity/TDS ranges from 0–1 µS/ppm up to 0–200 mS/ppt. Analog or 3½/4½-digit LCD (backlit optional).
All controllers include adjustable setpoint & hysteresis, above/below setpoint LEDs, push-to-test setpoint check, and solid-state 24 VDC output. Power is 115/230 VAC selectable (24 VAC optional). Compact footprint: 152 H × 122 W × 96 D mm (6 × 4.8 × 3.8 in.).
Sensors & Temperature Compensation
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Resistivity sensors: Pair the 750II resistivity models with the CS10 sensor featuring two integral temperature sensors for rapid, precise TC to 25 °C. Wetted materials include 316 SS (std.) or titanium; modular bushing options PP, PVDF, or 316 SS. Pressure/temperature up to 100 psi at 212 °F (100 °C).
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Conductivity/TDS sensors: Choose CS51LC (K=0.1) for very low ranges, CS51 (K=1.0) for 0–10 to 0–20,000 ranges, or CS52 (K=10.0) above 20,000. Integral temperature sensor for TC to 25 °C; PP bushing standard with optional PVDF/316 SS; up to 100 psi at 212 °F (higher ratings available by special order).
Why TC matters: The 750 Series II uses a refined TC circuit that matches the changing temperature coefficient of water, ensuring drift-free accuracy; TC can be disabled to meet USP requirements when needed.
Applications
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Ultrapure/DI water systems, distillation (Resistivity)
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Reverse osmosis, seawater desalination, cooling towers, boilers (to 250 psi @ 205 °C), waste treatment (Conductivity/TDS)
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Electronics, pharmaceuticals, laboratories, food processing, plating, power plants, printing, aquaculture, agriculture, environmental studies, process control.
Options & Accessories
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4–20 mA isolated output (digital), second alarm/control, piezo alarm (select models), temperature module, 3-sensor input switch, 3-range switch, remote alarm; SMP50 surface plate, and cabling to 100 ft.
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Why TC matters: The 750 Series II uses a refined TC circuit that matches the changing temperature coefficient of water, ensuring drift-free accuracy; TC can be disabled to meet USP requirements when needed.
Applications
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Ultrapure/DI water systems, distillation (Resistivity)
-
Reverse osmosis, seawater desalination, cooling towers, boilers (to 250 psi @ 205 °C), waste treatment (Conductivity/TDS)
-
Electronics, pharmaceuticals, laboratories, food processing, plating, power plants, printing, aquaculture, agriculture, environmental studies, process control.
Options & Accessories
-
4–20 mA isolated output (digital), second alarm/control, piezo alarm (select models), temperature module, 3-sensor input switch, 3-range switch, remote alarm; SMP50 surface plate, and cabling to 100 ft.
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