2 wire photoelectric heat detector AJ-521

2 wire photoelectric heat detector AJ-521

This product named fixed temperature heat detectors is suited to virtually any commercial. The detector responds in alarm if the temperature goes above the trip point. This unit is made up of an externally mounted thermistor with a specially designed cover that protects the thermistor while allowing maximum air flow. The thermistor reads the temperature from the air it takes in. It then transmits a signal representing the temperature to the panel. If the temperature exceeds the trip point, an alarm occurs. The status LED lights during the alarm period. The detector is suitable for detecting the heat in house, shop, hotel, restaurant, office, building, school, bank, library and etc.

Product Details

ANKA Sci-Tech Co.,Limited is one of the leading China 2 wire photoelectric heat detector AJ-521 manufacturers and suppliers, and also a professional company equipped with productive factory, we supply 2 wire photoelectric heat detector AJ-521 with high quality and competitive price.

why choose us

- 2000 square meters factory, have capability to supply wide range of products

Good quality control ,with competitive prices.

Prompt delivery.

Good after-sales service.

No Minimum order quantity limited.OEM and ODM are also accepted.

We locate in Shenzhen of China, easy for export.

Product Description


MCU processing, eliminate false alarm

Low standby current

Anti-RFI & Anti-EMI

9-35VDC wide operating voltage range

LED flashing visible in 360 degrees direction

Power supply non-polar input

Remote LED indicator output (2 wire)

Dustproof, mothproof, anti-light interference design

Technical specification

Model NO.



Operating voltage:DC9-35V
Static current:≤50uA12mA(NC);2mA(NO)
Alarm current:35mA(12V);83mA(24V)5mA(NC);15mA(NO)
Alarm output:Remote LED IndicatorRelay output
Alarm temperature:57℃/137F or 8~15℃/Min(Rate-of-Rise)
Installation:Ceiling mounted
Working environment:-10℃~+50℃,Humidity≤95%RH

Clear Picture

Our Services

1. We guarantee that all our items are "as stated" in their descriptions. We strive for 100% customer satisfaction on every sale we complete.

2. We are manufacture, there is no middle man, no high markup, so we can provide quality items yet very competitive price.

3. If you have any questions please contact us first, most are responded within 12 business hours.


1. T/T

2. West Union

3. Trade Assurance

4. Paypal


- All package can sent by FedEx/DHL/UPS/EMS, based on customer requires.

Freight By Sea to Any nearest port of customer country.

Freight by Air to airport of import country.

Company Information

ANKA is a high-tech enterprise specializing in the whole process of Research, Development, Manufacture and Marketing security alarm products. With the company policy of "Innovative technology, Makes safe life" and the responsibility of "Progress for protecting people's safety".


1. Quality of our company.

We are the manufacturer of alarm system for more than 10 years, we are full of experience and technology.

2. Quality of our products.

Our engineers who ever worked in a very famous company of alarm system, all the products must be strictly inspected before selling.

3. Quality of our services.

All of our products have a full two-year warranty and low repair rate.

4. Quality of our shippment.

We arrange the shippment as soon as we get the payment, fastly and professionally.

5. Quality of our sales representatives.

Truly, Warmly, Patiently, Professionally.





Previous:temperature alarm detector AJ-523 Next:Addressable heat detector AJ-6920