GE Telaire Ventostat T8041, Telaire Ventostat T8042 User Instructions

GE

Measurement & Control

The T8041 and T8042 are CO2
transmitters designed to be

installed in HVAC return air
ducts. The technology is based
on the absorption of light in a
gold-plated reflective light pipe
or waveguide diffusion gas
chamber. A gas permeable
PTFE filter prevents particulate
and water contamination of the
sensor. Light is absorbed in
proportion to the CO

concentration and the

remaining light is measured and converted into an analog signal.

Installation Instructions

1. Before installing the sensor, note the direction of the airflow. Ensure

all mounting holes are sealed tightly.

2. Drill/cut one 1-1/2” hole and punch/drill two 1/8” holes for

mounting screws.

3. Slide the sensor into 1 ½” hole and secure with #10 sheet metal

screws.

4. Connect the condui t and make necessary wire connections.

5. Install lid, and ensure it snaps into place.

2

Telaire Ventostat™ T8041/T8042

CO

Duct Mount Sensors

2

User Instructions

Figure 2: T8042 Installation

Figure 1: T8041 Installation

Figure 3: Wiring

T63103-005

October 2013

Page 1 of 2

Specifications

Measurement Range

0-2000 PPM fact ory calibrated

Operating Conditions

• Temperature: 0ºC to 50ºC (32ºF to 122ºF)

• Humidity: 0 to 95% relative humidity, non-condensing

Duct Air Velocity

0 to 1500 ft/min (0 to 450 meter/min)

Temperature Dependence

0.2% of full scale per ºC

Stability

<2% of full scale over the life of th e sensor (10 years typical)

*Accuracy

±40 ppm +3% of reading @ 22ºC (72ºF) when compared with a factory
certified reference

Non-linearity

<1% of full scale @ 22ºC (72ºF)

Pressure Dependence

0.13% of reading per mm of mercury

*Calibration

Sensors will be calibrated at zero and span at the factory. Calibration in
the field will not be required. Sensors will be shipped with ABC Lo gic™
turned on.

Storage Conditions

-40ºC to 70ºC (-40ºF to 158ºF)

Output

Voltage 0 to 10 VDC; 0 to 2000 ppm CO2 (100 ohm output impedance)

Power Supply Requirements

18 to 30 VAC RMS, 50/60 Hz or 18 to 42 VDC, polarity protected.

Power Consumption

Typical values (1.65 watts peak, 0.65 watts avg.@ 42 VDC)
*Note: The Telaire product line offers patented ABC Logic™ software

for self correction of drift to better than ±20 pp m per y e ar. The system is
virtually free of maintenance and typically has a lifetime of more than 10
years.

Physical Requirements

Dimensions:

Probe Length: T8041 4.09 in (10.38 cm)

T8042 8.07 in (20.51 cm)
Probe Diameter: 1.24 in (3.15 cm)
Junction Box Depth: 1.58 in (4.02 cm)
Junction Box H x L: 3.05 in x 3.05 in (7.46 cm x 7.46 cm)
Color: Grey (GY6275)

Installation Kit

Response Time

Three minutes typical for a 90% step change at low duct speeds

Included with the transducer are wi re nuts, mounting screws and
installation instructions.

Sampling Rate

Every two seconds

Warm-up Time

< two minutes (operational) ; 1 0 minutes to achieve maximum accuracy

Certifications

RoHS compliance
FCC Part 15,B
CE EMC EN61000-6-2, class B, criterion B*
*Deviations of the output signal may occur during strong electrical fast
transients on the power line

Enclosure flammability rating – UL94-5VA

Page 2 Telaire Ventostat™ T8041/T8042 Series