CWT(HK) Co., Limited



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T20 WIFI/GPRS Temperature and Humidity SMS Alarm System

T20 WIFI/GPRS Temperature and Humidity SMS Alarm System

    • T20 WIFI/GPRS Temperature and Humidity SMS Alarm System
    • T20 WIFI/GPRS Temperature and Humidity SMS Alarm System
  • T20 WIFI/GPRS Temperature and Humidity SMS Alarm System

    Product Details:

    Place of Origin: China
    Brand Name: CWT
    Certification: CE
    Model Number: T20

    Payment & Shipping Terms:

    Minimum Order Quantity: 1 unit
    Price: 150USD
    Packaging Details: 1 unit per box
    Delivery Time: 3 days after payment
    Payment Terms: T/T, Wstern Union, Paypal
    Supply Ability: 5000pcs per month
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    Detailed Product Description

    T20 WIFI/GPRS Temperature and Humidity SMS Alarm System

                                           Skype:   WhatsApp: 0086-13420971345


    The temperature and humidity of refrigerator & freezers used for storage of critical goods such as, cold room, warehouse, medicine, vaccine etc. need to be continuously monitored and recorded. If the temperature goes above or below the permitted temperature levels, the operating personnel need to be alerted as well so that the items can be well protected.


    Our systems for medical refrigerator temperature monitoring will monitor and record continuously with an accuracy of up to +/- 0.1 Deg. Celsius. Multiple units in different locations of a building can be monitored and connected to an GPRS or WiFi connection so that all the data will be continuously available on a PC or over the internet.


    This system is suitable for monitoring storage of medicines, vaccines, human tissues, samples, food etc. which  have to be stored under controlled conditions. The same system can be used for refrigerator, freezer,walk in chillers, cold rooms, warehouse etc.



    Power supply: DC12V/1.5A
    Inside temperature measure rang: -40°C ~ +125°C, accuracy±0.3°C
    Inside humidity measure rang: 0~100%RH, accuracy±2%
    External temperature probe measure rang: -55°C ~ +125°C
    GSM quad-band, applicable worldwide, 3G optional
    Working temperature: -40℃~+70℃
    Relative humidity: 10-90%, No condensation
    Exterior dimension: 130×130×19mm
    All-aluminum panel

    2 wired inputs for alarm, configurable alarm/recover SMS
    3 relay outputs (DC220V 2A / AC125V 2A)
    Power failure/recover alarm
    Built-in lithium-ion battery (500mAh/3.7V) which can last 6 hours
    Alert buzzer and light
    Adopted highly integrated industrial ARM MCU 
    Reliable performance with built-in double watchdog
    User programmable PC suite
    Low maintenance, 24×7 operation




    WIFI Access

    View Temperature Humidity data on APP

    Control relay on APP

    Realtime logging Temperature Humidity data



    3 relay outputs

    inside timer to program relay output


    Data Logger

    Inside temperature and humidity sensor

    4000pcs temperature records

    PC software program 


    SMS Operation

    Preset 10 authorized phone numbers

    SMS alarm

    Control relay via SMS

    Check current temperature via SMS


    GPRS Communication

    TCP/IP connect 4 internet servers

    Http:post, CWT I/O protocol, Modbus TCP

    Realtime data logger


    Function Specification


    T20 front.jpg

    manual.jpgT20 pi.jpgright.jpg


    Program Software Screenshot- Adding WIFI Address:




    Program Software Screenshot-Adding High/Low Temperature Range:


    T20 high low temperature.jpg


    Program Software Screenshot-Adding Basic Parameters:



    Why Choose Us:


    Contact Details
    CWT(HK) Co., Limited

    Contact Person: Ms. Glare Wang

    Tel: +86-755-26719943-8006

    Fax: 86-755-26719943-8059

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