Omega Products SGT-12-350-LD41 User Manual

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TRANSDUCER QUALITY STRAIN GAGE

1/2 BRIDGE LINEAR DIAPHRAGM

The following types of linear diaphragm strain gages can be used when the bonding area is larger than the diaphragm diameter. For example, if a body has a flat surface with a diameter of 1" onto which the strain gage is to be bonded, but a 0.5" diameter hole is drilled through the body leaving just a thin layer of material, then this thin

0.5" diameter is the diaphragm. So the strain gage grids are located above the thin high stress area and the leads/solder pads are over the solid part of the body in the low stress area. This linear diaphragm pattern has 2 strain gages mounted onto a single carrier. These types are used in pairs on a

0.5" diameter diaphragm. The strain gage closer to center will go into tension, and the outer gage will go into compression. Near the center of the diaphragm the radial and tangential strains will be positive, and will be nearly equal. The radial strain decreases and

from the center toward the outer edge of the diaphragm. The leads/solder pads are in the low stress area over thicker material. In this pattern, each carrier piece has one half-bridge with a common lead/solder pad. The corners of the Wheatstone bridge have been left open for the addition of zero temperature compensation resistors, and zero balance compensation resistors, if required. SGT-8/350-LD** and SGT/500-LD** are used in pairs on a 0.5" diameter diaphragm. Below we show a diagram with 2 pieces of the SGT-8/350-LD**, shown as they might be positioned on a 0.5" diameter diaphragm. The strain gages have been numbered and labeled. Also available is the SGT-7/350-LD** which offers

becomes negative as you move away

To Order (Specify Model Number)

PRICE NOM.

PER RESIS-

MODEL NO. OF 5 (Ω)A B C D(Vrms) TERMINATION COMP

Shown

actual size,

8.4 mm

SGT-8/350-LD11 $54.50 350 7 Ribbon Leads ST

SGT-8/350-LD13 54.50 350 10 Ribbon Leads AL

SGT-8/350-LD41 44.50 350 7 Solder Pads ST

Leads not

shown

Shown

actual size,

8.4 mm

SGT-8/350-LD43 44.50 350 10 Solder Pads AL

SGT-8/500-LD11 $56.50 500 7.5 Ribbon Leads ST

SGT-8/500-LD13 56.50 500 11 Ribbon Leads AL

SGT-8/500-LD41 46.50 500 7.5 Solder Pads ST

Leads not

shown

SGT-8/500-LD43 46.50 500 11 Solder Pads AL

FULL BRIDGE LINEAR DIAPHRAGM

PKG TANCE

2 half-bridges mounted onto one carrier piece, which can be used on a 0.28" diameter diaphragm again where the bonding area is larger. The grids are placed, centered over the diaphragm, and the leads/solder pads are over solid material in a low stress area.

Top View

-E

-S

Edge view showing placement

MOST POPULAR MODELS HIGHLIGHTED!

To Order

(Specify Model Number)

PRICE NOM.

DIMENSIONS

PER RESIS-

mm (in)

†

PKG TANCE

GRID CARRIER

MAX V* TEMP

MODEL NO. OF 5 (Ω) A B C D (Vrms)

TERMINATION COMP

SGT-9/350-LD11 $89.00 350 4.5 Ribbon Leads ST

SGT-9/350-LD13 89.00 350 6.5 Ribbon Leads AL

SGT-9/350-LD41 74.00 350 4.5 Solder Pads ST

SGT-9/350-LD43 74.00 350 6.5 Solder Pads AL

SGT-12/350-LD11 $89.00 350 5.5 Ribbon Leads ST

SGT-12/350-LD13 89.00 350 7.5 Ribbon Leads AL

SGT-12/350-LD41 74.00 350 5.5 Solder Pads ST

SGT-12/350-LD43 74.00 350 7.5 Solder Pads AL

SGT-18/350-LD11 $95.50 350 10 Ribbon Leads ST

SGT-18/350-LD13 95.50 350 14 Ribbon Leads AL

SGT-18/350-LD41 80.50 350 10 Solder Pads ST

SGT-18/350-LD43 80.50 350 14 Solder Pads AL

SGT-18/1000-LD11 $95.50 1000 9 Ribbon Leads ST

SGT-18/1000-LD13 95.50 1000 13 Ribbon Leads AL

SGT-18/1000-LD41 80.50 1000 9 Solder Pads ST

SGT-18/1000-LD43 80.50 1000 13 Solder Pads AL

SGT-24/350-LD11 $98.50 350 10 Ribbon Leads ST

SGT-24/350-LD13 98.50 350 14 Ribbon Leads AL

SGT-24/350-LD41 83.50 350 10 Solder Pads ST

SGT-24/350-LD43 83.50 350 14 Solder Pads AL

Shown

actual size,

10.2 mm

Shown

actual size,

13.5 mm

Shown

actual size,

19.2 mm

Shown

actual size,

19.2 mm

Shown

actual size,

25.4 mm

TRANSDUCER QUALITY STRAIN GAGE

FULL BRIDGE LINEAR

DIAPHRAGM PATTERN

0.8 2.6 10.2 4.0

(0.031) (0.102) (0.402) (0.157)

Full-bridge, 10.2 mm (0.4")

diameter diaphragm

350 Ω

1.0 2.6 13.5 4.0

(0.039) (0.102) (0.534) (0.157)

Full-bridge, 13.5 mm (0.5")

diameter diaphragm

350 Ω

1.8 5.0 19.2 6.4

(0.071) (0.197) (0.756) (0.252) Full-bridge, 19.2 mm (0.75 to 0.8")

diameter diaphragm

350 Ω

1.8 4.0 19.2 5.5

(0.071) (0.157) (0.756) (0.217) Full-bridge, 19.2 mm (0.75 to 0.8")

diameter diaphragm,

higher resistance,

reduced heat generation

1000 Ω

1.8 5.0 25.4 6.4

(0.071) (0.197) (1) (0.252)

Full-bridge, 25.4 mm (1")

diameter diaphragm

350 Ω

OMEGA

offers transducer quality, linear diaphragm pattern strain gages for use in pressure transducer designs. These patterns have 4 strain gages mounted onto a single carrier. The strain gages in the center will go into tension, and the outer 2 will go into compression. In the pressure transducer design, a diaphragm is clamped around the outer edge, and subjected to a uniform pressure. Near the center of the diaphragm the radial and tangential strains will be positive, and will be nearly equal. The radial strain decreases and becomes negative as you move away from the center toward the outer edge. Midway between the center and the outer edge the strain is at its lowest and the leads/Solder Pads are located in this low stress area. In these patterns, there are 2 half-bridges. Each half-bridge has a common lead/Solder Pads.

One of the patterns has been enlarged to show the detail. The strain gages and terminal pads have been numbered and labeled. The corners of the Wheatstone bridge have been left open for the addition of zero temperature compensation resistors, and zero balance compensation resistors if required. Several sizes are available.

SGT-9/350-LD** can be used for a

0.4" diameter diaphragm.

SGT-12/350-LD** can be used for a

0.5" diameter diaphragm.

SGT-18/350-LD** and SGT-18/1000-LD** can be used for 0.75 to 0.8" diameter diaphragms.

SGT-24/350-LD** can be used for 1" diameter diaphragms.

† For dimensions key, see page E-35.

Maximum permitted bridge energizing voltage (Vrms).

LD11, LD13, LD41 or LD43.

Note: For strain gage accessories see pages E-56 to E-59. Ordering Example: SGT-9/350-LD11, package of 5, full bridge linear

diaphragm pattern $89.

ST = Steel AL = Aluminum

NOTE

DISCOUNT SCHEDULE

1 to 10 pkgs . . . . . . . . . . . . . . . . . . .Net

11 to 24 pkgs . . . . . . . . . . . . . . . . . .5%

25 to 49 pkgs . . . . . . . . . . . . . . . . .10%

50 and up and OEM . .Consult Factory

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shown

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-S

Gage 2-

Gage 3+

Gage 4-

Gage 1+

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