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M300 Cond/Res

(Single-channel Version, IP65 Protection Rating)
The new M300 transmitter for conductivity/resistivity measurements combines robustness with ease of use. Its versatility and solid measurement performance makes it the ideal choice for light industrial applications. The M300 transmitter is designed for comfortable operation: from the large display to the easily accessible wiring terminals to the plain text interface and quick setup menu.

With its innovative USB port, the M300 is open to the future - for remote configuration, data logging or software upgrade. M300 transmitters are also available as dual-channel versions.
  • A user-friendly and sophisticated "Quick Setup" routine guides you through the first settings.
  • PID controller with pulse length, pulse frequency or analog control.
  • Multi-level password protection against accidental parameter changes.


Measured units conductivity, resistivity and temperature
Power supply 100...240 V AC, or 20...30 V DC
Protection 1/4DIN: IP65 (front); 1/2DIN: IP65/NEMA 4X
Current output 2x 0/4 to 20 mA, 22 mA alarm
Relays 2-SPDT mechanical rated at 250 VAC, 3 Amps; 2-Reed rated at 250 VAC or DC, 0.5 Amp switching
Temperature inputs Pt1000
Communication USB port, type B
Mounting options 1/4DIN: panel mounting; 1/2DIN: wall mounting
Measurement range 2-electrode sensor: 0.02 to 2000 μS/cm (500 Ωxcm to 50 MΩxcm); 4-electrode sensor: 0.01 to 650 mS/cm (1.54 Ωxcm to 0.1 MΩxcm)
Sensor inputs 2- and 4-electrode conductivity sensors

± 0.5% of reading or 0.5 Ω, whichever is greater, up to 18 MΩ X cm