Si Meccos iTr CO2 EV Monitor Gas Transmitter Universal Gas Alarm System 2001

The Si Meccos iTr CO2 EV Monitor is a stand-alone CO2 gas transmitter and alarm system for continuous room-air monitoring. It is designed for laboratories, boiler rooms, storage areas, basements, conference rooms, theaters, restaurants, and other occupied spaces where carbon dioxide accumulation or gas leakage requires supervision.

The transmitter uses infrared spectrometry at a wavelength of 4.3 µm and provides local visual and audible alarms. Three integrated relay contacts support alarm, warning, and fault signaling, while the 4–20 mA analog output enables connection to external monitoring or building-management systems.

Technical specifications

• Manufacturer: Si Meccos
• Model: iTr CO2 EV Monitor
• Part number: 13746
• Year of manufacture: 2001
• Measurement principle: Infrared spectrometry
• Measured gas: Carbon dioxide (CO2)
• Wavelength: 4.3 µm
• Light source: Halogen lamp
• Detector: Pyroelectric lithium tantalate (LiTa) element
• Optical path lengths: 50 mm, 20 mm, 10 mm, and 1 mm
• Typical measuring ranges: 0–1, 0–2, 0–5, and 0–100 vol% CO2
• Accuracy: ±5% of displayed value
• Response time: Less than 30 seconds at 90%; maximum 1 minute at 100%
• Operating temperature: +3 to +40°C
• Measurement points: One maximum
• Analog output: 4–20 mA, maximum 500 Ω load
• Relay outputs: One alarm, one warning, and one fault relay
• Relay contact configuration: Normally open/normally closed
• Maximum relay load: 48 V DC, 20 W
• Alarm indicator: Internal buzzer for alarm and fault
• Indicators: Four LEDs for alarm, warning, operation, and fault
• Alarm behavior: Red LED for latching main alarm and self-resetting pre-alarm; yellow LED for fault; green LED for operation
• Control inputs: Reset button and test activation
• Electrical connection: 18–26 V DC, residual ripple less than ±100 mV
• Power consumption: Maximum 25 W
• Ingress protection: IP56
• Dimensions (L × W × D): 165 × 82 × 90 mm
• Weight: Maximum 0.5 kg

This used CO2 monitoring transmitter is suitable for continuous gas detection in laboratory safety, indoor air-quality control, facility monitoring, and industrial or commercial rooms where reliable carbon dioxide surveillance is required.