Omega Products FRA-02018 User Manual

Thermocouple Insulators

Tolerances

The diameter and “out of roundness” of OMEGA’s insulators is plus or minus 5% or ±0.015", whichever is greater. The straightness is at least 1⁄32 inch for each six-inch length. The following table lists the maximum recommended

Bore Diameter 1⁄8" 3⁄32" 5⁄64" 1⁄16" 3⁄64" 1⁄32" 0.020" 1⁄64" 0.005"

Maximum Wire 0.102"

0.064" 0.064" 0.040" 0.032" 0.020"

Diameter

OMEGATITE® 450

This is an impervious, recrystallized, pure alumina ceramic containing over 99.8%

Al2O

. It has the most superior gas and

vacuum tightness and electrical insulating properties at elevated temperatures. It is non-reactive and recommended for use with platinum, as well as tungsten and molybdenum thermocouple alloys. The maximum service temperature is 1900°C (3450°F).

wire diameters which should be used with six-inch sections. Closer tolerances are permissible with shorter sections, but the minimum clearance tolerance is 5% or ±0.015", whichever is greater.

0.012"

0.008"

0.001"

OMEGATITE 350

This is an impervious, recrystallized pure alumina ceramic containing over 99% Al2O3. It has superior gas and vacuum tightness and electrical insulating properties at elevated temperatures. It is non-reactive and compatible with tungsten and molybdenum thermocouple alloys. The maximum service temperature is 1900°C (3450°F).

Assortment of OMEGA’s miniature insulators showing relative size. Sizes up to 1⁄4" OD are available from stock.

Call Custom Engineering for Pricing of Specific Tolerance Insulators.

OMEGATITE 200

This material is recommended for most thermocouple applications. It consists of a mullite type ceramic capable of withstanding temperatures up to 1650°C (3000°F).

Typical Physical Properties

Properties OMEGATITE 450 OMEGATITE 350 OMEGATITE 200

Constitution 99.8% Al2O3 99% Al2O3 80% Mullite 20% Glass Water Absorption 0.00 0.00 0.00 Specific Gravity 3.85 3.7 2.4 Gas Permeability Gas Tight Gas Tight Gas Tight Compressive Strength (psi) 300,000 300,000 100,000 Tensile Strength (psi) 30,000 30,000 14,000 Transverse Strength (psi) 55,000 55,000 20,000 Coefficient of Liner Thermal Expansion 24–250°C 6.2 x 10

24–500°C 7.4 x 10 24–1000°C 8.5 x 10 24–1500°C 9.8 x 10

Approximate Thermal Conductivity (BTU/ft 24°C 230 210 16

800°C 60 50 .......

Maximum Service Temperature 1950°C 1900°C 1650°C 3540°F 3450°F 3000°F

Dielectric Constant (1MC) 9.29 8.61 4.95 Dielectric Strength (volts/mil) 230 250 250 Volume Resistivity (Ω cm) 10

Te Value 800°C 1100°C .......

Hardness (Mohs Scale) 9 9 7 Fabrication Method Cast or Extrusion Cast or Extrusion Extrusion

/hr/°F/in)

–6

6.6 x 10

7.3 x 10

8.1 x 10

....... .......

–6

.......

Typical Chemical Analyses

OMEGATITE OMEGATITE OMEGATITE

Note: All properties are average for test specimens. Tests were performed according to ASTM specifications.

450 99.8 0.070 0.050 0.005 0.030 0.025 <0.003 0.004 0.001 ....... .......

350 99.0 0.7 0.07 0.05 0.030 0.07 ....... — ....... ....... .......

200 55.4 42.0 0.04 0.5 0.1 0.8 ....... 0.5 ....... ....... 0.7

2O3

SiO

MgO Na2O Ca Fe2O3 Cr2O3 TiO

A-142

MnO ZrO

K2O

WIDE RANGE OF SIZES AVAILABLE

OMEGA® thermocouple insulators are supplied in a wide range of sizes. Sizes up to 1⁄4 inch OD are available from stock. Other sizes and lengths by quotation.

Single-hole

IMPORTANT ORDERING NOTES

* LENGTHS n Prices quoted are for standard

six (6) inch length ceramics. Other sizes and styles are available on special order.

SPECIAL SIZES OR SHAPES n Orders for special sizes, shapes and tolerances should be explicit and accompanied by a sketch or print.

ceramics with closed end are available. See PTRA and PTRM series.

Single hole ceramics with closed end are

Discount Schedule

1-4 pkg................Net 25-49 pkg...........18%

5-10 pkg...............9% 50-99 pkg............20%

11-24 pkg............12% 100 pkg and up...25%

available. Consult Sales Department.

Special Lengths and

Metric Dimensions

Available.

Consult Sales

for Details.

Single Hole Round Insulators

To Order Visit omega.com/orx_insulators for Pricing and Details

OMEGATITE 450 OMEGATITE 350 OMEGATITE 200

Outside Inside Model Model Model Diameter Diameter Number Number Number

⁄4

⁄16

⁄8

⁄16

⁄32 0.020 ORX-020132 ORA-020132 ORM-020132

⁄8 ORX-1814 ORA-1814 ORM-1814

⁄32 ORX-33214 ORA-33214 ORM-33214

⁄16 ORX-11614 ORA-11614 ORM-11614

⁄32 ORX-332316 ORA-332316 ORM-332316

⁄16 ORX-116316 ORA-116316 ORM-116316

⁄16 ORX-11618 ORA-11618 ORM-11618

⁄32 ORX-132116 ORA-132116 ORM-132116

Two Hole Round Insulators OMEGATITE 450 OMEGATITE 350 OMEGATITE 200

Outside Inside Model Model Model Diameter Diameter Number Number Number

⁄4

⁄16

⁄8 0.040 TRX-04018 TRA-04018 TRM-04018

⁄8

⁄8 0.020 TRX-02018 TRA-02018 TRM-02018

⁄16

⁄64 0.010 TRX-010364 TRA-010364 TRM-010364

⁄32 0.005 TRX-005132 TRA-005132 TRM-005132

⁄64 TRX-56414 TRA-56414 TRM-56414

⁄16 TRX-11614 TRA-11614 TRM-11614

⁄16 TRX-116316 TRA-116316 TRM-116316

⁄32 TRX-13218 TRA-13218 TRM-13218

⁄64 TRX-164116 TRA-164116 TRM-164116

Four Hole Round Insulators OMEGATITE 450 OMEGATITE 350 OMEGATITE 200

Outside Inside Model Model Model Diameter Diameter Number Number Number

⁄4

⁄16

⁄8 0.020 FRX-02018 FRA-02018 FRM-02018

⁄16

⁄32 0.005 FRX-005132 FRA-005132 FRM-005132

All stock insulators are 6" in length. Other sizes, styles and lengths by quotation.

⁄16 FRX-11614 FRA-11614 FRM-11614

⁄64 FRX-364316 FRA-364316 FRM-364316

⁄32 FRX-132316 FRA-132316 FRM-132316

⁄64 FRX-164116 FRA-164116 FRM-164116

A-143