Installation Instructions

Installation Instructions
Document No. 129-512
October 12, 2009
Duct Averaging Sensors
Long Bendable Probe, 4 to 20 mA
Item Number 129-512, Rev. AA Page 1 of 4
Product Description
The temperature transmitter equipped Duct
Averaging Sensor assembly senses the average air
temperature in ductwork where mixing baffles are not
provided or where stratification occurs. Each sensor
assembly mounts on sheet metal ducts.
Contents
• Long, bendable, platinum RTD averaging
element
• 4 to 20 mA transmitter
• Electrical box for wiring connections
Product Numbers
Product
Number
Sensing
Element
Range
533-380-XX
100 Ω Pt (385α)
20°F to 120°F
(-7°C to 49°C)
XX
Insertion Length in Feet (m)
8
8 (2)
16
16 (5)
24
24 (7)
Warning/Caution Notations
CAUTION:
Equipment damage may
occur if you do not follow a
procedure as specified.
Required Tools
• Wire cutters
• Small, 1/8-inch wide flat-blade screwdriver
• Medium flat-blade screwdriver
• Four No. 10 × 1-inch sheet metal screws
• Electric drill
• 1/2-inch (13 mm) and 7/8-inch (22 mm) drill
bits
• No. 27 drill bit for screw holes
• Tin snips
• Wire ties suitable for service in the ductwork
Expected Installation Time
2.4 hours
Recommended Bulb Configuration
Figures 1 and 2 show the sensing element
arrangements. They provide the fastest response
when the element is exposed to cold temperatures.
Figure 1 shows the most practical mounting
arrangement; it does not require inside access to the
duct. The other sensing element arrangements
require inside access to the duct.
Mounting Hardware
Required for limited access duct
mounting option (Figure 1):
• Two mounting flanges (P/N 808-412).
• 16 No. 10 × 1-inch sheet metal screws.
• Tin snips.
• Pre-cut and drilled 8 × 4-inch (200 × 100 mm)
piece of sheet metal.
• Support rod of 3/8-inch OD copper or suitable
equivalent, long enough to fit diagonally
across the duct.
Required for walk-in duct mounting
option (Figure 2):
• Perforated steel hanger strap long enough to
traverse the duct at least twice.
• Wire ties suitable for service in the ductwork.
• Four No. 10 × 1-inch sheet metal screws.
Prerequisites
• The signal wiring must be pulled to the
installation site and enclosed in 3/8-inch
(9.5 mm) flexible conduit.
• For the limited access duct option, mount one
P/N 808-412 mounting flange and the sensor
on the 8 × 4-inch sheet metal plate.