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GE Telaire Ventostat 8000 Series User Instructions page 3

Co2 sensor
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Sensing Duct CO
Duct-Mounting the Enclosures
Ventostat products can be installed inside the return air ductwork, if
needed. As an alternative, please consider the T8031 unit. When
mounting these products inside the ductwork, seal the hole around the
wires and leave the duct insulation in place to prevent condensation
which may damage the sensor.
Pitot Tube Installation for T8300 and T8300-D
Install the mounting bracket, then install the pitot tube assembly as
The length of the Tygon® tubing is 6 ft. (1.8 m) with the
optional T62892 pitot kit for the T8300. In order to maintain
optimum accuracy, the tubing should not be lengthened. If the
sensor is mounted closer than 3 ft. (0.9 m) the excess tubing
should be shortened to avoid interference with mechanical or
moving devices.
1. To mount the pitot tube, drill one 7/8" hole through the duct.
2. Insert the pitot tube and mark the two remaining holes for the
mounting screws.
3. Punch or drill the two marked holes.
4. Note the direction of airflow in the duct.
5. Note the marking on the pitot tube flange and insert so that it is
properly aligned with the airflow.
6. To ensure an air tight seal, make sure the mounting surface of the
duct is clear of dirt or obstructions. Then, attach the pitot tube to the
duct with sheet metal screws or rivets.
7. Check the length of the tubing before attaching to the sensor. The
tubing should connect without stretching or pulling. If the length is
long enough to create a loop or bind in the tubing, it should be
8. To shorten the tubing, remove the connectors that attach to the
sensor and cut the tubing to length.
9. Replace the tubing connectors by using a twisting or screwing
motion. Verify the connection is secure.
If the tubing length has been shortened, be sure the in-line filter
is replaced on the pitot tube connector marked with an "H".
Telaire Ventostat™ 8000 Series
Accessory Enclosures
Model T1508 Duct Mount Enclosure (Aspiration Box)
The T8100/T8200/T8300 units can be installed inside a Model 1508
Duct Mount Enclosure.
Model T1552 Outside Air Measurement Enclosure
This NEMA-3R weatherproof enclosure includes thermostat and allows
installing the sensor in environments with temperatures down to
Model T1505 Harsh Environment Enclosure
For extreme environments where the sensor might be subjected to
condensation or water spray such as those found in greenhouses or
breweries- NEMA-3R rated.
Ventostat Specifications
Sensing Method
Non-dispersive infrared (NDIR) absorption
Gold-plated optics
Patented ABC Logic self calibration algorithm
Measurement Range
0 to 2000 ppm (0 ppm = 0 V, 4 mA; 2000 ppm = 10/5V, 20 mA)
T8100/T8200/T8300 - 5P models
0 to 5000 ppm (0 ppm = 0 V, 4 mA; 5000 ppm = 10/5V, 20 mA)
T8100/T8300 - Single Channel
400-1250 ppm ±30 ppm or 3% of reading, whichever is greater*,**
1250-5000 ppm ±5% of reading + 30ppm *, **
T8200 - Dual Channel
75 ppm or 10% of reading (whichever is greater)
*Tolerance based on span gas of ±2%
** ABC Logic not deactivated
Power Supply Requirements
18-30 VAC RMS, 50/60 Hz, or 18 to 42 VDC, polarity protected
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