Telaire Ventostat™ T8100 NS and NSP Series
Page 3
Ventostat Specifications
Sensing Method
Non-dispersive infrared (NDIR) absorption
Gold-plated optics
Patented ABC Logic self calibration algorithm
CO
2
Measurement Range
T8100
0 to 2000 ppm (0 ppm = 0 V, 4 mA; 2000 ppm = 10/5V, 20 mA)
CO
2
Accuracy
±30 ppm or 3% of reading, whichever is higher*
Power Supply Requirements
18-30 VAC RMS, 50/60 Hz, or 18 to 42 VDC, polarity protected
Power Consumption
Typical 0.7 W at nominal voltage of 24V AC RMS
Temperature Dependence
0.2% FS per °C (±0.11% per °F)
Stability
<2% of FS over life of sensor (15 years)
Pressure Dependence
0.135% of reading per mm Hg
Certifications
CE and RoHS compliant
Signal Update
Every 5 seconds
CO
2
Warm-up Time
< 2 minutes (operational)
10 minutes (maximum accuracy)
Operating Conditions
32°F to 122°F (0°C to 50°C)
0 to 95% RH, non-condensing
*CO
2
accuracy statement excludes standard gas used for calibration that
has an accuracy of 2%. In addition, there is a potential digital to analog
error of up to 1%.
Storage Conditions
-40°F to 158°F (-40°C to 70°C)
Flammability Classification
UL94 5VA
Thermistor Type
NTC 10 K
thermistor
Thermistor Accuracy
±1°C (15° to 35°C)
Night Setback Override Button (NS and NSP)
Shorts the thermistor output when depressed
Slide Potentiometer (NSP Only)
Left (stop) 0k Ohms (±5k
)
Center 50k Ohms (±7.5k
)
Right (stop) 100k Ohms (±15
)
ABC Logic™ Self Calibration System
ABC Logic™ (Automatic Background Calibration) self calibration
allows the sensor to continually recalibrate itself when the indoor
concentrations drop to outside levels while the building is unoccupied.
Generally a building must be regularly unoccupied for 4 hours or more
for this self-calibration system to operate properly. Under these
conditions, ABC Logic™ should maintain sensor calibration over the
lifetime of the sensor. The ABC Logic™ should be turned OFF where a
building is continuously occupied 24 hours per day, or where there could
be significant sources of non-occupant related CO
2
such as greenhouses,
breweries and other industrial and food processing applications.
Output
Analog
0 to 5 V, (100
output impedance)
0 to 10 V (100
output impedance) and
4 to 20mA (R
L
maximum 500
) available simultaneously for CO
2
output
Digital to analog error ±1%