The Supco IAQ50 is an Indoor Air Quality (IAQ) monitor designed to measure Carbon Dioxide (CO2) levels, temperature, and humidity. It is ideal for diagnosing indoor air quality issues and identifying "Sick Building Syndrome" due to high CO2 concentrations.
Function Description:
The IAQ50 provides triple displays for CO2 level, temperature, and humidity, allowing for comprehensive monitoring of indoor environments. It utilizes a stable Non-Dispersive Infrared (NDIR) sensor for accurate CO2 detection. The device offers various statistical measurements, including Time Weighted Average (TWA) over 8 hours and Short-Term Exposure Limit (STEL) over 15 minutes, which are crucial for assessing prolonged exposure to CO2.
For safety and ventilation control, the IAQ50 features both visible and audible CO2 warning alarms. Users can set two alarm limits: an upper limit to trigger air conditioning or ventilation and a lower limit to stop the alarm. The device also includes an alarm output relay, which can be connected to a ventilation system or activator to automatically condition the air quality when CO2 levels exceed the set upper limit. The relay will disengage when CO2 readings fall below the lower limit.
The IAQ50 supports both Automatic Baseline Calibration (ABC) and manual CO2 calibration to maintain accuracy over time. ABC helps eliminate zero drift of the infrared sensor by calibrating the meter at the minimum CO2 reading detected during 7 days of continuous monitoring, assuming the ventilating area has fresh air around 400ppm CO2. Manual calibration is recommended in outdoor areas with fresh air at approximately 400ppm CO2.
For data analysis and logging, the meter can connect to a PC via an RS232 interface, allowing for on-line logging and data analysis using dedicated software.
Important Technical Specifications:
- CO2 Measurement:
- Range: 0-2000ppm (Accuracy: ±50ppm, ±5% Reading); 2001-9999ppm (Accuracy: not specified)
- Resolution: 1 ppm
- Pressure Dependence: +1.6% reading per kPa deviation from normal pressure (100kPa)
- Temperature Measurement:
- Range: 14°F-140°F (-10.0-60.0°C)
- Resolution: 0.1°F / 0.1°C
- Accuracy: ±0.9°F / ±0.6°C
- Humidity Measurement:
- Range: 0.0-99%
- Resolution: 0.1%
- Accuracy: ±3% (10-90%), ±5% (others)
- Warm-Up Time: 30 seconds
- Operating Conditions:
- Temperature: 32°F-106°F (0-50°C)
- Humidity: 0-95%RH (avoid condensation)
- Storage Conditions:
- Temperature: 68°F-140°F (-20-60°C)
- Humidity: 0-99%RH (avoid condensation)
- Power: 12V adaptor (12V/1A output)
- Alarm: Audible (approx. 80dB) and visible (blinking LED)
- PC Connection: RS232 interface, 9600 bps, 8 data bits, no parity, ASCII format.
Usage Features:
- Easy Power On/Off: The meter automatically turns on with a short beep when the adaptor is plugged in. It performs a 30-second countdown for warm-up before entering normal mode.
- Temperature Display Switching: Users can cycle through air temperature, dew point temperature, and wet bulb temperature displays using a dedicated button.
- Statistical Data Access: A button allows users to view minimum, maximum, STEL, and TWA readings in sequence.
- Alarm Setting: Users can set upper and lower CO2 alarm limits (100 to 9900ppm in 100ppm increments) through the setup menu.
- Temperature Scale Selection: The temperature display can be switched between Celsius (°C) and Fahrenheit (°F).
- ABC Functionality: The Automatic Baseline Calibration (ABC) function can be enabled or disabled in the setup menu.
- Real-time Measurement: The meter updates readings every second. CO2 sensor response time is 30 seconds, while RH response time is 30 minutes for environmental changes.
- Alarm Behavior: Beeps can be stopped by pressing any key or automatically when CO2 falls below the lower limit. The LED alarm continues blinking until readings fall below the lower limit.
Maintenance Features:
- CO2 Calibration:
- Automatic Baseline Calibration (ABC): Designed to eliminate sensor drift by calibrating at the lowest CO2 reading over 7 days, assuming fresh air (around 400ppm) is present during this period. It is not suitable for consistently high CO2 environments.
- Manual Calibration: Recommended in outdoor areas with known fresh air (around 400ppm CO2). The process involves holding down specific buttons to enter calibration mode, and the meter automatically completes calibration after about 5 minutes.
- Caution: Do not calibrate in air with unknown CO2 levels or in unventilated indoor areas if ABC is enabled, as this can lead to inaccurate measurements.
- RH Calibration:
- The meter is calibrated using 33% and 75% salt solutions (Magnesium Chloride and Sodium Chloride, respectively).
- Ambient conditions of 25°C and stable humidity close to the calibrating value are recommended.
- The calibration process involves plugging the sensor probe into the salt bottle and holding down specific buttons. Each calibration step takes approximately 60 minutes.
- Caution: Do not calibrate humidity without the default calibration salt, as this can cause permanent damage.
- Troubleshooting: The manual provides guidance for common issues such as power failure, slow response, and error messages (E01, E02, E03, E04, E07, E11, E17, E31, E34) indicating sensor damage, out-of-range values, or calibration issues.
- Warranty: The meter comes with a 2-year warranty covering defects in material and workmanship under normal operation. The warranty is void if the meter has been opened or if damage results from misuse, abuse, alteration, neglect, improper maintenance, or leaking batteries. Proof of purchase is required for warranty claims.
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