Product Overview

IMMERSION WELLS AND COMPRESSION FITTINGS
68-0040—05 12
Fig. 14. Mounting averaging element with
314439 Mounting Clips.
Fig. 15. Mounting averaging element with 7640HX Averaging
Element Mounting Kit.
Bulb Shields
A bulb mounted outdoors requires protection of a bulb shield.
1. Expose the bulb to representative air temperature but
not direct sunlight.
2. Mount it high enough so:
a. Accumulated snow, leaves or other debris
cannot obstruct air circulation around it.
b. Children cannot reach it.
c. Avoid vents from the building.
3. Drill a 3/4 in. (19 mm) hole in the outside wall.
4. Bring the sensing bulb through the hole.
5. Mount the bulb in the bulb shield. See Fig. 16.
6. If the seal-off tube extends outside the shield, bend it
under the shield.
7. Hold the shield over the mounting location and form a
small-radius bend in the tubing.
8. Place the split plug (provided with 34886A; or order
107323A Split Plug separately) around the tubing and
move the bulb and shield into mounting position as a
single unit.
9. Push the split plug into the hole until it is wedged
securely in place.
10. Fasten the shield on the wall with screws (provided
with 34886A).
11. If the tubing is properly shaped and the split plug
installed as directed, the shield covers the split plug
and conceals the hole in the wall.
Fig. 16. Mounting bulb in bulb shield.
Strap-On Mounting
Occasionally, applications require the sensing bulb to be
strapped to the outside of a pipe. For these applications, use
either the 105900 Pipe Strap or metal hose clamps. The pipe
strap fits pipe up to 3/4 in. OD.
External mounting of the sensor produces a slight offset in
the temperature control point. Typically, the control
temperature increases as much as 5°F (2.8°C) with a bare
sensor strapped to the discharge pipe. Applying insulation
around the sensor and pipe decreases the offset. Insulation
must be used if large fluctuations in ambient temperature
occur near the pipe.
Mount the bulb on the pipe as follows:
CAUTION
Significant Calibration Shift Hazard.
Overtightening clamps distorts bulb calibration.
Do not overtighten hose clamps.
1. Secure the bulb to the pipe with a 105900 Pipe Strap or
metal hose clamps. See Fig. 17 and 18.
2. If necessary, cover the bulb and pipe with foam rubber
insulation that extends at least 6 in. (152 mm) beyond
both ends of the bulb. See Fig. 19.
IMPORTANT
Do not allow the duct tape to come into contact with
the pipe.
3. Secure foam rubber with duct tape.
DUCT
WALL
CAPILLARY
TUBING
GROMMET
AVERAGING
ELEMENT
USE NO. 10
SHEETMETAL
SCREWS
314439
CLIP
BEND HERE
IF NECESSARY
M17289
DUCT
WALL
4 in.
COVER
PLATE
CAPILLARY
GROMMET
AVERAGING
ELEMENT
M17270
CONDUIT
COMPRESSION
FITTING
WIRE TIES
1/2 in. EMT CONDUIT
(OBTAIN LOCALLY)
M17272A
OUTDOOR
SENSING
BULB
EXTENSION
TUBE
BULB SHIELD
CAPILLARY
TUBING
3/4 IN. (19 mm)
HOLE IN WALL
PLUG HOLE WITH
ACCEPTABLE MATERIAL