SONBEST SM2121M User manual

SM2121M Us e r Ma nual http://www.sonbus.com/

Sha nghaiSonbest Industrial Co., Ltd Page1

SM2121M

4-20mA current type liquid pH sensor

User Manual

File Version: V22.1.20

SM2121M using the standard DC4-20mA current output signal,easy access to PLC，DCS and other

instruments or systemsfor monitoring pH state quantities.The internal use of high-precision sensing core

and related devices to ensure high reliability and excellent long-term stability,can be customized

RS232,RS485,CAN,4-20mA,DC0~5V\10V,ZIGBEE,Lora,WIFI,GPRSand other output methods.

Technical Parameters

Technical parameter

Parameter value

Brand

SONBEST

SM2121M Us e r Ma nual http://www.sonbus.com/

Sha nghaiSonbest Industrial Co., Ltd Page2

PH range

4~14

PH accuracy

±0.5

Communication Interface

DC4~20mA

Power

DC12~24V 1A

Running temperature

-40~80°C

Working humidity

5%RH~90%RH

Wiringinstructions

Any incorrect wiring can cause irreversible damage to the product. Please carefully wire the cable as

follows in the case of power failure, and then connect the cable to confirm the correctness and then use it

again.

Core color

Identification

Note

Red

V+

Power V+

Blue

I+

sensor output

BLACK

V-

Power negative

electrode

In the case of broken wires, wire the wires as shown in the figure. If the product itself has no leads, the

core color is for reference.

Disclaimer

This document provides all information about the product, does not grant any license to intellectual

property, does not express or imply, and prohibits any other means of granting any intellectual property

rights, such as the statement of sales terms and conditions of this product, other issues. No liability is

assumed. Furthermore, our company makes no warranties, express or implied, regarding the sale and use

of this product, including the suitability for the specific use of the product, the marketability or the

infringement liability for any patent, copyright or other intellectual property rights, etc. Product

specifications and product descriptions may be modified at any time without notice.

Company: Shanghai Sonbest Industrial Co., Ltd

Address:Building 8,No.215 North east road,Baoshan District,Shanghai,China

Web: http://www.sonbest.com

Web: http://www.sonbus.com

SKYPE: soobuu

Email: sale@sonbest.com

Tel: 86-021-51083595 / 66862055 / 66862075 /66861077

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