• Freezer gsm sms temperature alarm T20
Freezer gsm sms temperature alarm T20

Freezer gsm sms temperature alarm T20

Product Details:

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

Payment & Shipping Terms:

Minimum Order Quantity: 1 unit
Price: 170USD
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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Detail Information

Product Description


GSM GPRS WIFI Temperature and humidity alarm, Temperature and Humidity data logger

                                             Skype: glare.wang



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:



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