Ventostat
8102/8102B Engineering Specification
 The
CO2 sensor for demand control ventilation
shall be the 8102 or 8102B non-dispersive infrared sensor
made by Telaire® (805-964-1699). The diffusion gas chamber
in the sensor should incorporate reflective light pipe
or waveguide surrounded by a gas permeable teflon based
hydrophobic diffusion filter that prevents particulate
and water contamination of the sensor. The sensor shall
have a 5 year calibration interval. In addition, the sensor
shall be provided with a five year calibration guarantee,
providing for free factory calibration if the sensor is
found to be out of calibration within five years of the
purchase date. For long-term stability, the sensor shall
utilize a dual channel infrared detector, one channel
for CO2 absorption, the other for
reference to correct for long term sensor drift. The sensor
shall provide simultaneous analog outputs in volts and
miliamps and shall have a gold bifurcated relay that can
be operated as normally open or closed. The sensor shall
incorporate elevation correction adjustment and ABCLogic™
(Automatic Background Calibration) software for self-correction
of drift to better than ±10ppm per year. All sensor electronics
shall be conformal coated for durability (applicable 8102B).
The sensor shall incorporate elevation correction adjustment
and have an accuracy of ±50 ppm or 5% (7% for levels over
1500 ppm) at temperatures of 60-90°F (15-32°C). All adjustments
to the sensor including output scaling, elevation adjustment,
relay setpoint, relay dead-band, proportional or exponential
output, and single-point calibration shall be made via
computer connected to an on-board RJ45 jack. The 8102
product shall also be adjusted using the on-board keypad
and display. For ease of installation, the sensor shall
have a detachable base with all field wiring terminals
on the base.
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