
Product Description

2 in 1 RV CO & Propane Gas Detectors
R503 Detector adopts two independent and highly sensitive sensors specifically designed for RVs.It is used to detect carbon monoxide & propane gas leak in Motorhome Travel Trailer, Motor Coach, Truck Camper, RV and other similar applications.
The distance between screw holes are compatible with #36681/#31011.
What You Get

Technical Specifications
![]() R503-Black Flush Mount CO/LP Detector | ![]() R502-Black CO/LP Detector | ![]() R501 RV Propane Gas Detector | ![]() Y401 Plug-in Natural Gas Detector | ![]() Plug-in CO/Gas Detector | ![]() Y201-Pro Portable gas detector | |
|---|---|---|---|---|---|---|
| Customer Reviews | — | — | — | — | — | — |
| Price | — | — | — | — | — | — |
| Application | RV Gas Monitor and Detection | RV Gas Monitor and Detection | RV Gas Monitor and Detection | Constant Gas Monitor and Detection | Constant Gas Monitor and Detection | Exact Leak Point Location |
| Feature | RV Professional Detector | RV Professional Detector | RV Professional Detector | Cost-effective Home Testing | Cost-effective Home Testing | Portable gas detector |
| Power Consumption & Supplier | 3W 9-16V 50/60Hz DC | 3W 9-16V 50/60Hz DC | 3W 9-16V 50/60Hz DC | 5W 110-220V 50/60Hz | 5W 110-220V 50/60Hz | AA battery x3 |
| Alarm Type | Visual & Audible Alarm | Visual & Audible Alarm | Visual & Audible Alarm | Sound and LED Alarm | Sound and LED Alarm | Sound and LED Alarm |
| Size | 4.6'' x 4.6'' x 0.79'' | 6.4'' x 2.75'' x 0.75'' | 6.4'' x 2.75'' x 0.75'' | 3.3'' x 3.5'' x 2.2'' | 3.7'' x 3.7'' x 1.22'' | 8.86'' x 5.12'' x 1.77'' |
| Product Type | RV Professional Detector | RV Professional Detector | RV Professional Detector | Plug-in Type Gas Detector | Plug-in Type Gas/CO Detector | Portable gas detector |
| Detection LP | ? | ? | ? | ? | ? | ? |
| Detection CO | ? | ? | ? | ? | ? | ? |
Product Description

2 in 1 RV CO & Propane Gas Detectors
R503 Detector adopts two independent and highly sensitive sensors specifically designed for RVs.It is used to detect carbon monoxide & propane gas leak in Motorhome Travel Trailer, Motor Coach, Truck Camper, RV and other similar applications.
The distance between screw holes are compatible with #36681/#31011.

Step 1: Enter into 180s Warm-up period
- Power on. The buzzer beeps "Di" twice, two red lights will flash and the green light will always be on. The display will show “-”. Please wait three minutes for sensor preheating.
- Note : Don’t apply gas to test during the warm-up process because the gas won’t be detected.

Step 2: Normal working
- Once the warm-up process is finished, the two red red lights will be off, and the green power indicator will remain on. The display will show “0”.
- Note : Don't paint, don't apply abrasive solvents or other cleaners. Chemicals can permanently damage or temporarily contaminate the sensor inside.

Step 3:CO concentration =100ppm or gas concentration = 5% LEL will trigger the alarm.
- When the carbon monoxide concentration is equal to or higher than 100PPM, the detector will sound an alarm and the carbon monoxide red alarm indicator will flash.
- When the carbon monoxide concentration is more than 10 (10000ppm), the number on digital display will be changed into letter A.
- When the gas concentration is equal to or higher than 5%LEL, the detector will sound an alarm and the gas red alarm indicator will flash.
- When the gas concentration is more than 10 (=10% LEL, 5000ppm), the number on digital display will be changed into letter A.

Step 4: Get after service support when two Red Lights will Flash on
- If the two red lights will flash or Digital Display will show ERR (abbreviation of error), which means sensor has lost efficacy and can’t finish data collection.
- Engineers on staff from factory help to answer any questions you have related to products usage of natural gas, propane, methane, and sewer etc.
What You Get

Technical Specifications
| Area of Usage: | Motor Home, Travel Trailer, Van Camper, Truck Camper |
| Operating Voltage: | 9-16V DC |
| Operating Current: | 110mA Max |
| Alarm Set Point: | Gas- 5% LEL, CO -100 ppm |
| Warm-up Time: | 3 minutes (regular) |
| Response Time: | Less than 30 seconds |
| Alarm Sound Level: | 85 dB at 1m |
| Operating Temperature: | 14°F to 131°F (-10°C to 55°C) |
| Relative Humidity: | 15% to 93% avoid condensation |
| Flush mount case: | 4 5/8” L x 4 5/8” W x 1/32” H (118x118x7mm) |
![]() R503-Black Flush Mount CO/LP Detector | ![]() R502-Black CO/LP Detector | ![]() R501 RV Propane Gas Detector | ![]() Y401 Plug-in Natural Gas Detector | ![]() Plug-in CO/Gas Detector | ![]() Y201-Pro Portable gas detector | |
|---|---|---|---|---|---|---|
| Customer Reviews | — | — | — | — | — | — |
| Price | — | — | — | — | — | — |
| Application | RV Gas Monitor and Detection | RV Gas Monitor and Detection | RV Gas Monitor and Detection | Constant Gas Monitor and Detection | Constant Gas Monitor and Detection | Exact Leak Point Location |
| Feature | RV Professional Detector | RV Professional Detector | RV Professional Detector | Cost-effective Home Testing | Cost-effective Home Testing | Portable gas detector |
| Power Consumption & Supplier | 3W 9-16V 50/60Hz DC | 3W 9-16V 50/60Hz DC | 3W 9-16V 50/60Hz DC | 5W 110-220V 50/60Hz | 5W 110-220V 50/60Hz | AA battery x3 |
| Alarm Type | Visual & Audible Alarm | Visual & Audible Alarm | Visual & Audible Alarm | Sound and LED Alarm | Sound and LED Alarm | Sound and LED Alarm |
| Size | 4.6'' x 4.6'' x 0.79'' | 6.4'' x 2.75'' x 0.75'' | 6.4'' x 2.75'' x 0.75'' | 3.3'' x 3.5'' x 2.2'' | 3.7'' x 3.7'' x 1.22'' | 8.86'' x 5.12'' x 1.77'' |
| Product Type | RV Professional Detector | RV Professional Detector | RV Professional Detector | Plug-in Type Gas Detector | Plug-in Type Gas/CO Detector | Portable gas detector |
| Detection LP | ? | ? | ? | ? | ? | ? |
| Detection CO | ? | ? | ? | ? | ? | ? |




























