3
TDD
FM Rev. 8/6/01
Diagram 2.1 Dimensions
3.0
Mechanical Installation
The following general installation instructions and precautions must be followed to insure
proper, reliable switch operation:
1. Select a suitable location on the piping system for installation. Installation in a
location where sediments can collect on the switch’s temperature sensing
probe (such as the underside of a horizontal piping run) will cause sluggish or
faulty operation.
2. The switch should not be installed directly on top of a horizontal piping run (12
O’clock position). Air pockets which can form at the top of the pipe will prevent
the measuring probe from obtaining accurate temperature measurement.
Mounting at the 2 O’clock to 5 O’clock or the 7 O’clock to 10 O’clock position is
best.
3. The ambient temperature range which the switch can withstand is -4°F to
+140°F. If the switch is located outdoors in a cold environment the switch must
be protected from excessively cold temperatures with insulated heat tracing or
by other suitable means. In hot environments the switch should be located in
an area where the ambient temperature does not exceed 140°F.
4. In order to obtain an accurate measurement of the bulk fluid temperature in a
pipe, the fitting into which the switch is installed must allow the sensing probe
tip to protrude past the ID of the pipe and into the flow stream. The turbulent
fluid flow will then promote mixing and yield an accurate measurement.
1.75
0.
93
1.
68
1.
56
41 mm
Std. connector
M-12 x 1
1.89
.47
.4
5
.28
A
B
1/2” NPT
2.76
3/4” NPT
2.78
Dimensions in inches unless otherwise noted
