ES-2 Electrical Conductivity Sensor

The ES-2 Electrical Conductivity & Temperature Sensor is designed to measure the electrical conductivity (EC) and temperature of water in a pipe or tank. EC is useful for measuring salinity levels or quality of irrigation water.

The ES-2 can be installed in line with an irrigation pipe, in a water body, or in a tank.


TemperatureRange: –40 to 60 °C
Resolution: 0.1 °C
Accuracy: ±1 °C
Bulk ECRange: 0 to 120 dS/m
Resolution: 0.001 dS/m
Accuracy: ±0.01 dS/m or ±10% (whichever is greater)
OutputDDI serial or SDI-12 communication protocol
Data logger compatibilityMETER ZL6 data loggers and any data acquisition system capable of 3.6- to 15-VDC power and serial or SDI-12 communication
DimensionsLength: 10.9 cm (4.30 in)
Width: 2.4 cm (0.95 in)
Thread: 1/2-in National Pipe Thread
Operating temperature rangeMinimum: –40 °C
Maximum: 60 °C

NOTE: Sensors may be used at higher temperatures under certain conditions; contact Customer Support for assistance.

Cable length5 m (standard)
75 m (maximum custom cable length)

NOTE: Contact Customer Support if a nonstandard cable length is needed.

Connector types3.5-mm stereo plug connector or stripped and tinned wires
Supply voltage (VCC to GND)Minimum: 3.6 V
Maximum: 15.0 V
Digital input voltage (logic high)Minimum: 2.8 V
Typical: 3.6 V
Maximum: 5.0 V
Digital input voltage (logic low)Minimum: –0.3 V
Typical: 0.0 V
Maximum: 0.8 V
Digital output voltage (logic high)Typical: 3.6 V
Power line slew rateMinimum: 1.0 V/ms
Current drain (during measurement)Minimum: 20 mA
Typical: 20 mA
Maximum: 28 mA
Current drain (while asleep)Typical: 0.03 mA
Power up time (DDI serial)Maximum: 100 ms
Power up time (SDI-12)Minimum: 100 ms
Typical: 200 ms
Maximum: 250 ms
Measurement durationTypical: 25 ms
Maximum: 50 ms
COMPLIANCEManufactured under ISO 9001:2015
EM ISO/IEC 17050:2010 (CE Mark)
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California requires the following notice

⚠️ WARNING: This product may contain chemicals including ethylene glycol, lead, nickel, styrene and cadmium, which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov

ES-2 Electrical Conductivity Sensor