The ANWETECH AT-S236 is an AC-powered photoelectric smoke detector designed for smoke monitoring in industrial and electrical applications.
The detector uses an infrared photoelectric sensing principle to detect visible smoke particles generated by smoldering or flaming fires. Its optical structure and signal-processing design provide resistance to dust, insects and external light interference, helping improve detection stability in demanding environments.
The AT-S235 operates directly from an AC 110–240VAC power supply and provides both local alarm indication and external relay output.
When smoke reaches the alarm threshold, the detector activates its red LED indicator, built-in audible alarm and relay output. When the smoke concentration returns to normal, the detector automatically returns to normal monitoring status.
The original product information specifies infrared photoelectric sensing, intelligent logic control, NO/NC alarm output, LED indication, SMT construction and resistance to dust, insects and white-light interference.
| Parameter | Specification |
|---|---|
| Model | AT-S236 |
| Product Type | AC Photoelectric Smoke Detector |
| Operating Voltage | AC 110–240VAC |
| Detection Technology | Infrared Photoelectric Sensor |
| Sensitivity | 0.1–0.3 dB/m |
| Optional Sensitivity | 0.3–0.5 dB/m |
| Standby Current | ≤2 mA |
| Alarm Current | ≤10 mA |
| Alarm Indication | Red LED + Audible Alarm |
| Alarm Sound Level | 85 dB |
| Alarm Output | NO / NC Relay Contact |
| Contact Rating | 3A 250VAC / 30VDC |
| Operating Temperature | -30°C to +85°C |
| Relative Humidity | Max. 95% RH, non-condensing |
| Dimensions | Ø99 × 48 mm |
| Reset Mode | Automatic Reset |
| Self-Test | Yes |
Except for the updated AC 110–240VAC supply range confirmed for AT-S235, the electrical, sensitivity, environmental and dimensional data above are taken from the supplied technical document.
Under normal operating conditions, the detector continuously monitors the surrounding air for smoke.
The red status indicator flashes approximately once every 5–6 seconds during normal operation.
The detector automatically monitors environmental smoke concentration and compensates sensitivity according to operating conditions.
When the detected smoke concentration approaches the alarm threshold, the detector increases its smoke trend analysis and the alarm LED begins flashing rapidly.
When the smoke concentration reaches or exceeds the alarm threshold:
After the smoke concentration returns to normal, the detector automatically returns to normal monitoring status.
One of the main advantages of the AT-S235 is its integrated relay alarm output.
The detector provides:
NO – Normally Open
NC – Normally Closed
COM – Common
This allows the detector alarm condition to provide an external switching signal for compatible monitoring or control equipment.
The source documentation identifies the base terminals as:
3A at 250VAC / 30VDC
When smoke is detected, the AT-S235 activates a built-in audible alarm with a rated sound level of:
85dB
Together with the red LED alarm indicator, this provides both audible and visual local alarm indication.
The AT-S235 supports automatic alarm recovery.
After the smoke concentration falls back to a normal level, the detector automatically returns to normal operating condition without requiring manual reset.
This function is particularly useful for standalone equipment monitoring applications where continuous automatic operation is required.
The detector includes a built-in test button for routine functional inspection.
Pressing the test button causes:
The self-test function is intended to check the internal operating functions of the detector.
The AT-S235 is designed for indoor smoke monitoring applications including:
These applications are specifically identified in the original product documentation.
The compact Ø99 × 48 mm detector can be installed for smoke monitoring in electrical cabinets and similar equipment spaces.
Photoelectric smoke detection can provide local smoke alarm indication in transformer substation applications.
The detector's direct AC supply and relay alarm output make it suitable for smoke monitoring applications where an external alarm signal is required.
The AT-S235 can be used for smoke monitoring inside compatible enclosed industrial equipment spaces.
The photoelectric sensor provides detection of visible smoke generated by smoldering and flaming fires in suitable indoor environments.
For correct installation and reliable smoke detection:
ANWETECH recommends performing a simulated fire alarm test approximately:
Every 6 Months
The test should confirm that the detector is operating correctly.
Keep the detector clean and free from excessive dust or contamination that may interfere with smoke entry or normal sensing performance.
