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Model A and B
Dialtemp™ Dial Thermometers
INSTRUCTION
SHEET
M0055/0702
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INSTALLING THE THERMOMETER
Model A and B Dial Thermometers are supplied
standard with a
1
⁄2" NPT hex mounting nut.
Carefully screw the thermometer into the fitting
by hand until slightly tight. Complete tightening
using a
7
⁄8" wrench on the hex nut. (See Figure
1). When using a thermowell, tighten only
FINGER TIGHT. CAUTION: NEVER TIGHTEN
BY TWISTING THE HEAD! To obtain a positive
seal, coat threads with pipe joint compound, or
use Teflon
®
tape.
When inserting Dialtemp™ Dial Thermometers
into semi-solid materials, hold stem firmly and
insert slowly and carefully to avoid bending. Do
not hold thermometer by the head when
inserting into a material, always hold by the
stem.
A
1
⁄4" NPT mounting nut,
3
⁄4" NPT Adapter
bushing and plain hex bushing (with no
threads) are also available as mounting options
for the Model A and B Dial Thermometers.
It is not always desirable to permanently mount
Dialtemp™ Thermometers. Clip Hangers (Model
C-10) and Spring Handles (T-27) are available
as a mounting option. They are used for
mounting thermometers on the rim of tanks,
kettles, urns, solder pots, beakers and other
containers. Simply slide the metal clip onto the
1
⁄
4
" stem of the thermometer and lower it into the
liquid.
CAUTION: Avoid handling the thermometer
by the stem or bending the stem when
carrying it around.
SILICONE-FILLED THERMOMETERS
OMEGA provides the same features in its
special order silicone-filled thermometers as the
standard 3" and 5" styles. They are offered for
severe industrial applications where vibration is
a problem. Silicone is a non-toxic viscous fluid.
Its dampering characteristics prevent wear and
tear on internal parts and improve readability by
reducing flutter.
To specify, add “-SF” to the end of the part
number.
THERMOWELLS
Thermowells should be used whenever the
stem would be exposed to pressure, corrosion,
or shear forces. They also make it possible to
remove the thermometer without losing
pressure or contents.
OPERATING INSTRUCTIONS
For the correct temperature, the stem of the
Dial Thermometer must be immersed at least 2"
in fluids and 4" in gases. An exception to this
rule are thermometers with the ranges of 0-
100°F, 24-125°F, and 0-50°C. These require at
least 3
1
⁄2" in liquid and 5" in gas.
TO RESET THE DIAL
1. Determine the room temperature using a
reference thermometer of known accuracy.
2. Firmly hold the hex mounting nut in the hand
or with a
7
⁄8" wrench.
3. While firmly holding the thermometer, slowly
turn the RESET SCREW with a screwdriver
(or
1
⁄4" wrench). The dial face INSIDE the
head will rotate as the screw is turned.
Slowly turn the reset screw until the proper
temperature on the dial face is aligned with
the pointer.
.250
Reset Screw
Specify stem length between these points
.69
3.00
.14
.31
.63
Mounting Nut – 1/2" NPT
MODEL A DIMENSIONS
FIGURE 1
SPECIFICATIONS:
ACCURACY: ±1% of full scale
RESPONSE TIME:
Readings are stabilized
within 40 seconds.
RECALIBRATION:
External with
1
⁄4" nut reset
screw.
MATERIALS
CONSTRUCTION: Stainless steel welded
construction (rust and
corrosion-proof, leak-proof,
hermetically sealed)
HEAD & BEZEL: Polished Type 302
stainless steel.
MOUNTING NUT: Type 303 stainless steel,
7
⁄8" Hex,
1
⁄2" HPT
DIAL FACE: Anodized aluminum with
raised black marks and
numbers with satin matte
finish background. Easy to
read. Minimum parallax.
STEM:
1
⁄4" Dia. 304 Stainless Steel
(highly resistant to
corrosion)
CRYSTAL: Optically clear strong
glass. Unbreakable clear
polycarbonate plastic
crystals are on all silicone-
filled models which are not
recommended for ranges
over 300° F.
DIMENSIONS
HEAD DIAMETER:
Model A; 3" dia.
Model B; 5" dia.
STEM DIAMETER:
1
⁄4" dia.
STEM LENGTH: Standard is 9". Also
available: 2
1
⁄2", 4", 6", 12",
15", 18", 24", 30", 36"
(Stems over 36" are also
available, consult Sales
Department for pricing).
Intermediate lengths
available on special order
(allow 5 weeks). NOTE: A
4" stem is the shortest
length for ranges 0-100°F,
25-125°F, and 0-50°C.
POINTED STEMS:
Optional on all models.
They are excellent for
probing asphalt, compost,
soil, frozen foods and
other semi-solid materials.
RESET SCREWS:
1
⁄4" Hex Nut with slot for
.250
Reset Screw
Specify stem length between these points
.69
5.00
.14
.31
.63
Mounting Nut – 1/2" NPT
MODEL B DIMENSIONS
FIGURE 2
Teflon
®
is a registered trademark of DuPont.