Spec Sensors

General Description

The Spec gaseous sensors are raw sensors (non-ruggedized) connected to a micro-controller or a communication board and are designed to measure gases such as carbon monoxide, nitrogen dioxide, ozone, sulfur dioxide, as well as hydrogen sulfide and breath alcohol.

Principle of Operation

SPEC Sensors’ screen printed sensors are ultra-thin electrochemical sensors.

Features

All sensors:

• Dimensions: 20 x 20 x 3.8 mm
• Weight: < 2 ounces

Carbon Monoxide sensors:

• Measurement Range: 0 - 1000 ppm
• Detection Limit: 0.5 ppm
• Resolution: < 100 ppb (instrumentation dependent) 
• Repeatability: < +/- 2 % of reading
• Response time - T(90): < 30 seconds (15 seconds typical)
• Sensitivity: 4.75 +/- 2.75 nA/ppm
• Expected operating life: >5 years (10 years @ 23 +/-3 ^oC; 40 +/- 10% RH)
• Operating temperature range: -30 to 55 ^oC (-20 to +40 C recommended)
• Operating humidity range: 15 to 95 % 
• Operating bias: 0 to 5 mV
• Power consumption: 10 to 50 uW (circuit and ambient CO dependent)

Nitrogen Dioxide sensors:

• Measurement Range: 0 - 20 ppm
• Resolution: < 20 ppb (instrumentation dependent) 
• Repeatability: < +/- 3 % of reading
• Response time: < 15 seconds typical
• Sensitivity @ -200 mV bias: 40 +/- 10 nA/ppm
• Expected operating life: >5 years (10 years @ 23 +/-3 ^oC; 40 +/- 10% RH)
• Operating temperature range: -40 to 50 ^oC (-20 to +40 C recommended)
• Operating humidity range: 0 to 100 % RH (15 to 95 % recommended)
• Power consumption: 10 to 50 uW (circuit and ambient NO₂ dependent)

Ozone sensors:

• Measurement Range: 0 - 20 ppm
• Lower detectable limit: < 20 ppb (instrumentation dependent)
• Repeatability: < +/- 3 % of reading
• Response time: < 15 seconds typical
• Sensitivity @ 0 mV bias: -32 +/- 10 nA/ppm
• Expected operating life: >5 years (10 years @ 23 +/-3 ^oC; 40 +/- 10% RH)
• Operating temperature range: -30 to 50 ^oC (-20 to +40 ^oC recommended)
• Operating humidity range: 0 to 100 % RH (15 to 95 % recommended)
• Power consumption: 10 to 50 uW (circuit and ambient O₃ dependent)

Applications

• Fixed Industrial Safety Monitoring
• Portable Industrial Safety Detection
• Portable Personal Safety Monitor
• Indoor Air Quality Monitoring
• Outdoor Air Quality Monitoring
• Bad Breath/Halitosis Respiration Sensing