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CM-508A resistivity controllerMain features
Four range, automatic switching, automatic carry display, simple operation, high measurement accuracy.
Automatic temperature measurement and automatic temperature compensation of the solution.
Adopting a 3 1/2 digit LCD digital display, temperature and measurement values are displayed simultaneously, with a beautiful appearance and clear display.
The temperature coefficient and electrode constant of the solution can be set.
It has the functions of conductivity and resistivity over limit alarm output and control. The relay action point is set within the range of conductivity (0-1999 μ S · cm -1) and resistivity (0-18.25M Ω· cm).
The resistivity (B channel) has an isolated 4-20mA current signal output and can operate as an instrument output or transmitter.

CM-508A resistivity controller2、 Main technical indicators:

CM-508A resistivity controllerDual channel measurement can monitor two sampling points, integrating conductivity, resistivity, and temperature measurements. The instrument adopts microcontroller technology, and the temperature coefficient, electrode constant, conductivity upper limit alarm point, and resistivity lower limit alarm point of pure water are set through buttons. Widely used in industries such as pharmaceuticals, electronics, and chemicals for online monitoring of pure water, it is an ideal supporting instrument for various small and medium-sized pure water equipment. This instrument is suitable for matching the front conductivity and rear resistance between secondary reverse osmosis and EDI/ion exchange resin mixed beds.

CM-508A resistivity controllerMeasurement range:
The conductivity of channel A ranges from 0 to 10.00 m S · cm -1, with automatic switching between measurement ranges.
The conductivity of channel B is 0-18.25M Ω· cm, and the range automatically switches between them.
Temperature measurement range 0-60 ℃
2.2 Basic error of electronic unit: ± 2.0% (FS) ± 1 word.
2.3 Basic error of the instrument: ± 3% (FS) ± 1 word
2.4 Temperature compensation range: (5-50) ℃, reference temperature 25 ℃.
2.5 Temperature measurement error: ± 1 ℃
2.6 Supporting electrodes:
Measurement of conductivity electrode constant for channel A: 1.0cm-1 Material: Plastic
B-channel resistivity measurement electrode constant: 0.01cm-1 Material: stainless steel
2.7 Working pressure of conductivity cell: 0-0.5Mpa
2.8 Output current signal (B channel): isolated output 4-20mA (maximum load 500 Ω)
2.9 Alarm contact capacity: 2A/250V AC (under resistive load)
2.10 Thread size: 1/2 'pipe thread.
2.11 Cable length: Regular 5m or otherwise agreed upon
2.12 Dimensions 96 × 96 × 130mm (height × width × depth)
2.13 Weight: 1.5 kg.
2.14 Normal usage conditions:
a) Environmental temperature: (5~50) ℃; Relative humidity: not exceeding 85%;
b) Power supply: AC220V ± 10% 50HZ
c) No significant vibration; There is no external magnetic field interference except for the Earth's magnetic field.

3、 Instrument installation dimension diagram
1. Dimensions of the instrument: 96 × 96 × 120mm (height × width × depth)
2. Dial opening size: 92 × 92mm
3. Installation method: Embedded