TOA-DKK CM-31P Handheld Electrical Conductivity Meter (0.1mS/m-10S/m)

  • Manufacturer: TOA DDK
    Model: CM-31P
    Origin: Japan
    Guarantee: 12 month
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Manufacturer: TOA-DKK

Model: CM-31P

Origin: Japan

Warranty: 12 months

Measuring Method: AC two-electrode method

Display: Custom LCD

Meas. Range: 

[If standard cell is used] Electrical conductivity: 0.1mS/m-10S/m

Electrical resistivity: 0.1Ω・m-10kΩ・m

Salinity (NaCl equivalent from electrical conductivity): 0-4.00%

Temperature: 0-80.0℃

[If cell for pure water is used] Electrical conductivity: 5μS/m-20mS/m

Electrical resistivity: 50Ω・m-200kΩ・m

Temperature: 0-80.0℃

Display Range: 

 +Electrical conductivity: 








 +Electrical resistivity : 









 +Salinity(NaCl): 0-4.04%

Temperature: -5-110.0℃

*In regards to the range, the electrical conductivity/ resistivity differs according to the cell that is used.

Electrical Conductivity/Resistivity Range Switching: Auto/manual

Electrical Conductivity/ Resistivity Unit Switching: Can switch between SI Units(S/m, Ω ・ m) and the previous units (S/cm, Ω・cm).

Repeatability (Main unit):  

 +Electrical conductivity: ±0.5%FS

 +Electrical resistivity: ±0.5%FS

 +Salinity  ±0.5%FS

 +Temperature: ±0.2℃

Temperature compensation: 

 +Switch setting between Auto/Manual/None Temperature compensation method: Linear/pure water dual temperature compensation 

 +Reference temperature: 25℃

 +Temperature coefficient: 0-9.99%(optional setting)

Calibration: Cell constant calibration

Temperature Calibration: One-point calibration

Data Memory: 1000 data points

Auto Hold Function: Provided (Stability  threshold  : Fixed)

Clock Function: Provided (To be shown while conducting a measurement)

Interval Memory Function: Provided (Interval: The interval can be specified between 1 sec.-99 min. 59 sec. or 2 sec.-99hr. 59 min.)

Printing Function: Can connect the external printer EPS-P30 (option)

RS-232C Interface (non-isolated):

 +Connectable Devices: PC or external printer EPS-P30 (option)

 +Communication Specifications: Communication system: Start-stop synchronous method; Baud rate: 19,200 bps;

 Character length: 8 bits; Parity: None; Stop bit: 1 bit

Analog Output (non-isolated): 

 +Number of Outputs/Items: ch1: Number of outputs: 3 Measured value, temperature, and range (only for electrical conductivity/resistivity)

 +Output Specification: Electrical conductivity/ electrical resistivity/ salinity: 0-1V FS (each range); Range: 100mV/range; Temperature: 0-1 V (0-100℃)

Waterproof Construction: IP67 (Enabled if the sensor is connected and if the external I/O portions are masked) (Can be immersed in water for 1m and 30 min.)

Performance Compensation Temperature: 0-45℃

Power Source: AA alkaline battery/nickel-hydrogen battery (2 pieces) or special AC adapter (6VA option)

Power Consumption(If 3 volt battery is used)*2: Approx. 0.009W

Battery Life: Approx. 600hours

Outside Dimensions: Approx. 68 (w) x 35 (h) x 173  (d)  mm

Mass (Including Batteries): Approx. 280g


+ Main unit

+ Conductivity Sensor: CT-27112B

+ Hand strap: 0TZ00006

+ AA Battery (2pcs)

+ Manual


-Tính năng:

+ Có khả năng hiển thị độ mặn (NaCl) (CM-31P)

+ Có thể đạt được kết quả có độ chính xác cao trong nước tinh khiết với chức năng bù nhiệt độ nước tinh khiết (CM-31P-W)

+ Thiết kế tiết kiệm điện; pin có thể sạc lại được

+ Thiết kế chống thấm nước (IP67, ngâm sâu 1m, tối đa 30 phút)

Phạm vi đo lường (khi sử dụng cell chuẩn):

 Dải đo lường:

+ EC: 0.1mS/m-10S/m

+ ER: 0.1Ω・m-10kΩ・m

+ Độ mặn: 0-4.00%

+ Nhiệt độ: 0-80℃

Ứng dụng: Dùng để đo độ dẫn điện, điện trở, độ mặn, nhiệt độ trong phòng thí nghiệm


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