Veris Industries

Model CWLSXX - Carbon Dioxide Sensors



CWL carbon dioxide sensors maximize energy savings, while ensuring optimal ventilation. The sensors allow ventilation systems to be controlled by the amount of CO2 present in a space. The CWL Series detect fluctuations in CO2 levels and signal ventilation systems to provide an inlet of fresh air optimal for the space at a given time saving energy and ensuring tenant comfort.


  • Controlling ventilation in response to occupancy
  • Facilitating compliance with ASHRAE 62.1-2004 standard for air quality
  • Office buildings, conference rooms, schools, retail stores, etc.

Microprocessor design increases accuracy and reduces installation time

  • Non-dispersive infrared technology (NDIR) repeatable to ±20 ppm ±1% of measured value
  • Innovative self-calibration algorithm...easy to maintain
  • 5-year calibration interval (recommended)
  • Low ambient sensitivity
  • Field-selectable outputs for operation flexibility

Revolutionary direct duct mounting design

  • Integrated transducer and probe...eliminates the need to install a separate pick-up tube
  • Snap-on screws required, making installation and service a snap
  • Adjustable duct probe...simplifies installation and airflow monitoring
  • CO2, humidity, and temperature sensing all in one compact device...fewer units to buy and install

  • Input Power 20 to 30VDC/24VAC; 100mA max.
  • Analog Output 4-20mA, (clipped & capped)/0-5VDC/0-10VDC (selectable)
  • Operating Temperature Range 0° to 50°C (32° to 122°F)
  • Housing Material High impact ABS plastic

CO2 Transmitter:

  • Sensor Type Non-dispersive infrared (NDIR), diffusion sampling
  • Measurement Range 0-2000/5000 ppm (programmable)
  • Accuracy ±30 ppm ±2% of measured value*
  • Repeatability ±20 ppm ±1% of measured value
  • Response Time <60 seconds for 90% step change

RH Transmitter:

  • HS Sensor Fully replaceable, digitally profiled thin-film capacitive (32-bit mathematics) U.S. Patent 5,844,138
  • Accuracy ±2% from 10 to 80% RH; NIST traceable multi-point calibration
  • Stability ±1% @ 20°C (68°F) annually, for two years
  • Operating Humidity Range 0 to 100% RH
  • Operating Temperature Range 10° to 35°C (50° to 95°F)
  • Temperature Coefficient ±0.1% RH/°C above or below 25°C (typical)

Temperature Transmitter:

  • Sensor Type Solid-state, integrated circuit
  • Accuracy ±0.5°C (±1°F) typical
  • Resolution 0.1°C (0.2°F)
  • Range 10° to 35°C (50° to 95°F)

Relay Contacts:

  • 1 Form C (SPDT) (on models without setpoint slider option) 1A@30VDC, resistive; 30W max.

RTD/Thermistors in wall packages are not compensated for internal heating of product.EMC Conformance: EN 61000-6-3:2001 Class B, EN 61000-6-1:2001, EN 61000-3-2:2000, EN 61000-3-3:2001, EMC Test Methods: CISPR 22:1997 (Amended A1:2000, A2:2002) Class B, IEC 61000-4-2:2002, IEC 61000-4-3:2006, IEC 61000-4-4:2004, IEC 61000-4-5:2001, IEC 61000-4-6:2004, IEC 61000-4-8:2001, IEC 61000-4-11:2004.EMC Special Note: Connect this product to a DC distribution network or an AC/DC power adaptor with proper SURGE PROTECTION (EN 61000-6-1:2001 specification requirements).*Measured at NTP

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