Omega A - Manual

Model A and B

Dialtemp™ Dial Thermometers

INSTRUCTION

SHEET

M0055/0702

50

100

150

200

250

300

350

400

450

500

°

F

®

O

M

E

G

A

E

NGIN

EERI

NG, INC.

S

TA

M

FO

RD

, CO

NNECT

ICUT 06007

INSTALLING THE THERMOMETER

Model A and B Dial Thermometers are supplied
s t a n d a r d w i t h a

1

⁄

2

" N P T h e x m o u n t i n g n u t .

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 ) . W h e n u s i n g a t h e r m o w e l l , t i g h t e n o n l y

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
n o t h o l d t h e r m o m e t e r b y t h e h e a d w h e n
inserting into a material, always hold by the
stem.
A

1

⁄

4

" N P T m o u n t i n g n u t ,

3

⁄

4

" N P T A d a p t e r

b u s h i n g a n d p l a i n h e x b u s h i n g ( w i t h n o
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

a s a m o u n t i n g o p t i o n . T h e y a r e u s e d f o r
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
b y t h e s t e m o r b e n d i n g t h e s t e m w h e n
carrying it around.

SILICONE-FILLED THERMOMETERS

O M E G A p r o v i d e s t h e s a m e f e a t u r e s i n i t s
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
r e m o v e t h e t h e r m o m e t e r w i t h o u t l o s i n g
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

h e a d w i l l r o t a t e a s t h e s c r e w i s t u r n e d .
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.