13044_Ins_ZPS_ACC
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:[email protected] • Web:www.bapihvac.com
Static Pressure Accessories
Installation and Operation Instructions
Rev. 05/22/2017
1 of 3
Mounting the Duct Static Pressure Probe, Hoses and Damper
Duct Static Pressure Probe Assembly
The duct static pressure probe assembly consists
of a static pressure probe, a six inch piece of silicon
rubber tubing, a twelve inch piece of silicon rubber
tubing, two self drilling sheet metal screws and a
pressure spike reducer.
Positioning the duct static pressure probe assembly to get the best results requires a little planning. Ideally the probe
should be located 1/2 the distance from the fan to the end of the longest duct run. The probe should be a minimum of five
duct diameters from any vanes, straighteners, reducers or bends. The probe may be placed within 1/2 duct diameter of a
filter as long as the filter is five duct diameters from any other restriction.
Drill a 1/4 inch hole in the duct for the probe. Insert the 6 inch long section of the probe into the duct work and rotate so
the air flow arrow is pointing in the same direction as the air flow in the duct. Using the two self drilling screws provided
secure the probe to the duct. For round duct pick the two holes in the probe mounting flange that touch the duct surface.
Position the probe so that it is at a right angle to the duct surface or at right angles to a line tangent to the duct surface for
round duct. Being off by +/- 5 degrees angle is acceptable.
Long runs of tubing will damp out quick pressure fluctuations. Where the ZPS unit must be located close to the static
pressure tube BAPI provides a pressure spike reducer. The pressure spike reducer provides a slight restriction in the
tubing. The volume of tubing after the pressure spike reducer determines the time constant, the longer the tubing the
greater the pressure spike reduction.
Place the 6” tube towards the pressure source. Connect the 12” tube to your ZPS pressure transmitter. If you do not get
the dampening that you desire, increase the tubing length from the blue plastic snubber to the pressure sensor.
Condensation running down the interior of the tubing will damage the sensor. Forming a drip loop in the tubing just
before it enters the ZPS transmitter is good practice, see Fig 4. The distance from the bottom of the loop to the ZPS’s
pressure port should be one to two inches (2.5 to 5 cm) greater than the highest air pressure, including error conditions, in
the duct system.
Fig. 1:
BAPI ZPS-ACC07
Fig. 3:
ZPS-ACC09
Hoses with
Pressure
Damper
Fig. 2:
ZPS-ACC08 Static
Tube
