Seeed Sensecap s-ec-01 User manual

User Guide

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Liquid EC & TDS Sensor

User Manual

Version：v1.1

 User Guide 
 
 
 
©2008-2021 Seeed Technology Co., Ltd. All rights reserved. solution.seeedstudio.com 
 
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Index
Customer Support....................................................................................................3 
Introduction .............................................................................................................4 
Wiring diagrams......................................................................................................5 
Dimension and Ordering Infomation ......................................................................7 
1 Dimension ...........................................................................................................................7 
Installation , On board buttons and Calibration ......................................................8 
1 Installation.............................................................................................................................8 
2 Installation Guide..................................................................................................................8 
3 On board buttons..................................................................................................................8 
4 Restore Factory Settings.......................................................................................................8 
5 Calibration.............................................................................................................................9 
5.1 Perform EC calibration by on board buttons ................................................................9 
5.2 Perform EC calibration by command............................................................................9 
5.3 Perform EC calibration by SensorOneSet Configuration Utility..................................9 
Output Signal Conversion.....................................................................................10 
RS485 Modbus Protocol ....................................................................................... 11 
1 Modbus Protocol..............................................................................................................11 
2 Modbus Register ..............................................................................................................11 
3 Modbus Register Detail Descripton ...............................................................................13 
4 Modbus Function Code ...................................................................................................17 
4.1 Function Code 3 Protocol Example.........................................................................17 
4.2 Function Code 4 Protocol Example.........................................................................18 
4.3 Function Code 6 Protocol Example.........................................................................19 
4.4 Function Code 16 Protocol Example.......................................................................20 
Software Configuration Utility..............................................................................22 
1 Hardware Setup ..................................................................................................................22 
2 Universal Modbus Comm Utility.......................................................................................22 
3 SensorOneSet Configuration Utility .................................................................................22 
 

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1Customer Support

Thank you very much for your order. Our success comes from the continuous faith in the

excellence of our products and services, something we are committed to and would never sacrifice.

Our customer service, especially in the after sales phase, guarantees the satisfaction of our clients.

In line with this strategy, we appreciate that you can share with us your feedback at any time for our

improvement, be it positive or negative, so if we can serve you better in anyway, please do inform

us.

Need Technical Support?

Check out our Forum where is the base of our Technical Support Team. We tend to share our

technical support at our Forum where the whole community can access it, but you may also email

us at [email protected] for technical help.

User Guide

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2Introduction

S-EC-01 measures Conductivity, Salinity, TDS with temperature compensation. The output

signal can be RS485 or Analog Voltage. The sensor is applicable for industrial, water processing,

sewerage system, irrigation, smart agriculture etc.

■Conductivity, Salinity and TDS measurement with temperature compensation

■With ABS or Stainless steel electrode

■Output Interface with RS485, Voltage

■High accuracy with excellent stability

■Reverse power protection and Built-in TVS/ESD protection

Specifications

Output Interface

Analog Voltage 0-2V

(Output resistance ~0ohm)

RS485 Modbus-RTU

Power Supply

3.9-30V/DC

Power Consumption(Idle)

40mA@24V DC

Power Consumption(Max)

80mA@24V DC

Start-up time

< 2 seconds

EC Measurement

Isolated Sensor Input, Range: 0-20000us/cm

Resolution: 0-10000us/cm, 10us/cm; 100000-20000us/cm, 50us/cm

Accuracy: 0-10000us/cm, ±3%; 10000-20000us/cm, ±5%

EC temperature compensation: 0-50°C

Temperature Measurement

Range: -40~80°C, Resolution:0.1°C, Accuracy:±0.5°C

IP Ratings

Electrode:IP68; Transmitter:IP65

Operating Temperature

-40~85°C

Installation

Electrode:1/2"NPT screw threads; Transmitter: Mounting hole

Cable Length

Power and Signal Cable:2 meters or Customize; Electrode Cable:5 meters

Dimension

Electrode:1/2"NPT screw threads; Transmitter:128*70*42mm

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3Wiring diagrams

Type

Wiring diagram

Analog

Voltage

Output

Red (V+): Power Supply +

Black (GND): Power Supply -

Blue (O1): Analog Output

RS485

Modbus

Red (V+): Power Supply +

Black (GND): Power Supply -

Yellow (T+): RS485+/A/T+

White (T-): RS485-/B/T-

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ALL RS485 communication parameters (Modbus Slave Address, baud rate, parity, data bits,

stop bits) are set in internal register and can be saved when power down, the default setting is

ADDRESS=1, BAUDRATE=9600bps, PARITY=NONE, DATABITS= 8bits,

STOPBITS=1bit;

Sometimes you may FORGET the communication settings. In this case, you can open the

shield module and press the SW1-SET button at least 3 seconds, then all the communication

parameters reset to default setting, then communicating with the sensor using the default

setting to set your desired settings.

Please re-power up the sensor to make the settings effective.

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4Dimension and Ordering Infomation

4.1 Dimension

Electrode(mm)

Unit: mm

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5Installation , On board buttons and Calibration

5.1 Installation

1/2"NPT screw threads installation. Please refer to the dimensions.

5.2 Installation Guide

Should following the common requirements for conductivity electrode installation.

5.3 On board buttons

There are 3 buttons on the transmitter board.

Button

Functionality

Comment

SW1-SET

1）Enter into EC calibration

2）Exit EC calibration

3）Reset to factory settings

1）Long press for more than 3

seconds to restore the factory

settings.

2）Short press to enter into the EC

calibration.

3）Short press to exit the EC

calibration.

SW2-CALL

EC calibration for

1413us/cm(1.413ds/m)

In EC calibration mode, Immerse

the electrode in 1413us/cm solution

for a while and short press the

button to perform the auto

calibration.

SW3-CALH

EC calibration for

12880us/cm(12.88ds/m)

In EC calibration mode, Immerse

the electrode in 12880us/cm

solution for a while and short press

the button to perform the auto

calibration.

5.4 Restore Factory Settings

Long press SW1-SET button for more than 3 seconds to restore the factory settings. You can

restore the factory settings in following cases:

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1）EC Calibration failed and EC value is incorrect.

2) Can not communicate with sensor due to forgetting the communication parameters.

5.5 Calibration

When performing the EC calibration, you should guarantee the temperature of the standard EC

calibration solution is around 25°C . And wait for a while for temperature and EC equilibrium after

immersing the sensor into the standard solution.

5.5.1 Perform EC calibration by on board buttons

1）Short press SW1-SET button and enter into the EC calibration mode, then the led indicator flash

two times every second, Note that communication is not available in calibration mode.

2）In EC calibration mode, Immerse the electrode in 1413us/cm solution for a while and short press

the SW2-CALL button to perform the auto calibration.

3）In EC calibration mode, Immerse the electrode in 12880us/cm solution for a while and short

press the button to perform the auto calibration.

4）Short press SW1-SET button to exit the EC calibration mode

5）Verify the sensor output.

5.5.2 Perform EC calibration by command

1）Immerse the electrode in 1413us/cm solution for a while and then write 0xFFFF to modbus

2）Immerse the electrode in 12880us/cm solution for a while and then write 0xFFFF to modbus

calibration.

3）Verify the sensor output.

5.5.3 Perform EC calibration by SensorOneSet Configuration Utility

SensorOneSet is a configuration utility to read/set sensor config for all of our serial

communication sensor products. Please contact us if you need the English version.

User Guide

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6Output Signal Conversion

Output Interface

Parameters Range

Conversion Formula

Analog Voltage

Output 0-2V

EC range: 0-2000us/cm

EC=1000*VOLTAGE. When VOLTAGE=0.3V，then

EC=1000*0.3=300us/cm

EC range: 0-5000us/cm

EC=2500*VOLTAGE. When VOLTAGE=0.3V，then

EC=2500*0.3=750us/cm.

EC range: 0-10000us/cm

EC=5000*VOLTAGE. When VOLTAGE=0.3V，then

EC=5000*0.3=1500us/cm.

EC range: 0-20000us/cm

EC=10000*VOLTAGE. When VOLTAGE=0.3V，then

EC=10000*0.3=3000us/cm.

RS485

Modbus-RTU

EC range: All

EC=(REGISTER VALUE).When REGISTER

VALUE=1568，then EC= 1568us/cm.

NOTE: The unit of VOLTAGE is (V).

NOTE: VWC is Volumetric Water Content, EC is Electrical Conductivity.

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