Orion System CO2 Sensor v.1 - Manual (Page 3)

Technical Guide
CO
2
SENSOR
3
Overview
The Wall Mounted Space CO
2
Sensor (OE256-01) is used for monitor-
ing room CO
2
levels and is designed for permanent wall mounting in
the conditioned space . It connects to the VCM-X E-BUS Controller
(OE332-23E-VCMX) or RNE Controller (OE332-23E-RNE) by using
TSDRSC modular prefabricated cable with RJ-45 connectors. It can be
daisy-chained with the Digital Room Sensor (OE217-00 or OE217-01)
or wired separately from the Orion Space Temperature Sensor (OE210,
OE211, OE212, or OE213) for applications requiring both a room CO
2
sensor and room temperature sensor. See Figure 1 for dimensions.
The OE256-02 Duct Mounted CO
2
Sensor is comprised of the OE256-01
CO
2
Sensor and the WattMaster Aspiration Box Assembly. It is used for
sensing the current CO
2
level in the HVAC unit’s return air stream. It is
designed to be mounted in the return air of the HVAC unit and uses its
integral aspiration box to sample the CO
2
level in the duct.
Some typical applications are:

Controlling ventilation in a building where the occupancy
varies frequently

Controlling ventilation to ensure excess outdoor air is not
causing energy waste

Ensuring good air distribution throughout building zones

Demand Control Ventilation
Sensor Overview
Features
The CO
2
Sensor provides the following:

Uses the patented dual beam Non-Dispersive Infrared ™
(NDIR) technology

A very accurate and stable sensor guaranteed to maintain
its accuracy due to infrared self-calibration feature of sensor

Sensor accuracy of +/- 50 ppm @ 1000 ppm or 2% of the
measured value

Annual drift of +/- 2 ppm per year

Measurement range of 0 to 2000 ppm

LED under front cover shows active CO
2
sensing

Addressable based on function within the system
Figure 1: Wall Mounted CO
2
Sensor Dimensions
Environmental Requirements
The CO
2
Sensor needs to be installed in an environment that can main-
tain a temperature range between 14°F and 122°F and a humidity range
between 5% and 95% RH (non-condensing).