Technical Guide
Duct Mounted E-BUS CO
2
Sensor Technical Guide
3
Overview
The OE256-07 Duct Mounted E-BUS CO
2
Sensor with Remote Pickup
Tube
is used for monitoring duct CO
2
levels and is designed for per-
manent mounting in the Return Air duct. It utilizes an aspiration box
to accurately capture CO
2
levels in the duct. It connects to the VCB-X
Controller (OE335-23-VCBX) by using an E-BUS cable with E-BUS
connectors. See Figure 1 for dimensions.
The Wall Mounted E-BUS CO
2
Sensor (OE256-05) is used for monitor-
ing space CO
2
levels and is designed for permanent wall mounting in
the conditioned space. It connects to the VCB-X Controller using an
EBC E-BUS Expansion Cable. It can be daisy-chained with the E-BUS
Digital Room Sensor (OE217-02, OE217-03, OE217-04) for applica-
tions requiring both a space CO
2
sensor and space temperature sensor.
For more information, refer to the OE256-05 Wall Mounted CO
2
Sensor
Technical Guide.
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
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
HB LED under front cover shows active CO
2
sensing
432 1
3M
E-BUS CONNECTOR
FEMALE END
SENSOR
HOUSING
HINGED
COVER
BRASS
BARB
FITTINGS
FOR
0.170 I.D.
TUBING
BRASS
BARB
FITTINGS
FOR
0.170 I.D.
TUBING
EBC-10F
"WATTMASTER EBUS" "WATTMASTER EBUS"
EBC-10F
432 1
3M
432 1
3M
120.00” APPROX.
120.00” APPROX.
E-BUS CONNECTOR EXTENSION CABLE WITH MALE ENDS (PROVIDED WITH SENSOR)
0.170 I.D. TUBING (PROVIDED WITH SENSOR)FIRE RATED
CO2 PICKUP TUBE (PROVIDED WITH SENSOR)
CO2 SENSOR, HOUSING AND CABLE ASSEMBLY
5.00"
3.31"
4.12"
2.55”
13.00"
APPROX.
8.25"
0.55”
4.06"
2.81”
Figure 1: Duct Mounted E-BUS CO
2
Sensor with
Remote Pickup Tube Dimensions
Environmental Requirements
The Duct Mounted E-BUS CO
2
Sensor needs to be installed in an
environment that can maintain a temperature range between 14°F and
122°F and a humidity range between 5% and 95% RH (non-condensing).
(16 paginas)
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