Thermowells, Materials | Omega Vehicle Security A instruction

Model A and B

Dialtemp™ Dial Thermometers

	INSTRUCTION	M0055/0702
	SHEET	M0055/0702
	SHEET

200		250					300
200							300
150		®					350
150							350
100				°			400
				°
	50					F	450
	O	A A					500
	M
	E
	TG
	S		E
		M	E
		F		N	GI
		OR			GI		.
			D,		CO	NE	.
					CO	ERING,INC
						NNE
						CTICUT06007

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 31⁄2" 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.

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

Teflon® is a registered trademark of DuPont.

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: 21⁄2", 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

MODEL A DIMENSIONS

Reset Screw

Specify stem length between these points