TSI Instruments 8691-2 Installation Instructions

FUME HOOD SENSOR AVERAGING VENTING KIT
This Sensor Averaging Venting Kit can be installed with all TSI Fume Hood Face Velocity Controllers and Face
Velocity Monitors.
Preinstallation
Installation will be substantially easier if the side wall
of the fume hood can be removed prior to Sensor
Venting Kit installation. If the side wall cannot be
removed, there is usually an access panel inside the
fume hood that needs to be removed. This should
allow enough room to maneuver the tubing.
Parts List (Figure 1)

One T-fitting Assembly w/sensor housing

20 ft.1½" ID Tubing

One extra-long sensor cable

Two mounting flanges (black)

One bag with:
 One O-ring
 Four screws
 Four clamps
 Two brackets
 Two self-tapping nuts
Installation
Step 1: Select location of SENSOR ASSEMBLY,
typically lying on top of the fume hood
(Figure 4). SENSOR ASSEMBLY must be
located to reference room air, within 15 ft of
the controller. If using an existing velocity
sensor, make sure to use O-ring to seal the
side-wall sensor to the sensor housing and
tighten down self-tapping nuts using the two
posts on the sensor housing.
Step 2: Determine MOUNTING FLANGE location. Use
Figure 2 as a guide.
Step 3: Drill 1½" hole through the fume hood liner at
this location
INSTALLATION INSTRUCTIONS
Step 4: Mount the MOUNTING FLANGE to the
MOUNTING PLATE using 2 #8-32 x 5/8 inch
screws (Figure 3).
Both sides of tubing must be of equal length
(Figure 4).
Step 5: Cut tubing to fit between the MOUNTING
FLANGE and the T FITTING. Slide 2 hose
clamps onto tubing. Remove the T FITTING
and insert one end of tubing onto the T
FITTING. Push other end of tubing onto
mounting flange. Secure tubing by tightening
hose clamps.
Step 6: Repeat Step 2 through Step 5 on the other
side of the hood.
Step 7: Loosely push T FITTING onto the SENSOR
ASSEMBLY.
Figure 1: Parts
MODEL 8691-2
WARNING