Installation & Operation of ULTRAC Airflow Measuring Stations
Unpacking and Inspection
Unpack the station carefully to avoid damaging the honeycomb, straightening-vane section. If any portion of the honeycomb is bent, it may be straightened using needle-nose pliers. Be sure to remove all cardboard protecting panels and packing materials from the unit. A careful visual inspection should reveal any shipping damage such as bent or broken measuring tubing, damaged casing, etc. If shipping damage is evident, the unit must be repaired prior to placing it in service to avoid inaccurate signals. For advice on repairs, consult your local ULTRATECH Industries, Inc. sales representative or the ULTRATECH Engineering Department at 1-800-656-2004.
Installation
ULTRAC stations in sizes up to 18 inches may be readily installed by positioning them in the duct opening and bolting them securely in place. Take care not to damage the honeycomb when positioning the unit between the flanges of the duct. Orient the unit with the honeycomb section facing upstream. Check the flow direction arrow on the side of the station. Install standard gaskets or apply sealant (suitable to the duct system) between the flanges to give a positive seal. Tighten the flange bolts securely, but do not over-tighten. Approximately 12 to 15 ft. lbs. torque is sufficient. Refer to the table "INSTALLATION CLEARANCES" on the next page for allowable distances from duct obstructions.
Larger stations may be lifted into position using a chain or cable sling placed around the perimeter of the station, or by attaching hooks or eyebolts to the flanges. Stations 60-inches or larger may require eyebolts installed in a center balanced area in the "top" of the unit. Note that the "top" may be any side of the station, depending on the desired location of the instrument connections. The ULTRAC station will function equally well regardless of the installation angle or the inclination of the duct. If eyebolts are installed, care must be taken when drilling into the casing to avoid damage to the honeycomb or measuring assembly. The use of 3/8" eyebolts is suggested, with a 4" x 4" washer inside to evenly distribute lifting stress. After installation of the unit, the eyebolt may be left in place or removed and the hole plugged with a short bolt, washer, and nut to prevent air leakage.
Instrument or Gauge Connections
Connect the instrument tubing to the HI and LO station connections. The HI and LO ports are clearly labelled (HI is on the upstream side of the unit). Use two wrenches when installing the tubing fittings, taking care to hold the station fitting securely while tightening the tubing fitting. Avoid twisting the internal parts of the measuring assembly. Use thread sealer to prevent leaks, since small leaks may cause inaccuracies in measurements. ULTRAC units are furnished with and without manifold valves (zeroing valves), according to the specifications of the job. See specifications on the ULTRAC Zeroing Manifold Valve for details.
Model Identification
The model and serial number of each ULTRAC Airflow Measuring Station is inscribed on the identification tag which is riveted to the casing adjacent to the instrument connections. The measuring area of the station (in square feet) is engraved directly on the casing next to this tag. The area information is necessary to establish actual C.F.M (cubic feet per minute) flow valves since the output signals from the station will be F.P.M. (feet per minute) velocity measurement as indicated by a pressure in inches of water column (in w.c.). F.P.M. divided by the area in square feet.
If any problem arises concerting the application, installation or use of this unit or any ULTRATECH product, please contact your local ULTRATECH sales representative or the ULTRATECH Industries, Inc. Engineering Department at 1-800-656-2004.
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