Omega Products SGT-12-350-LD41 User Manual

Page 1
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 ()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
+S
Edge view showing placement
MOST POPULAR MODELS HIGHLIGHTED!
DIMENSIONS
mm (in)
GRID CARRIER
1.1 4.3 8.4 5.5
(0.043) (0.169) (0.331) (0.217) Half-bridge, used in pairs, 13 mm
(0.5") diameter diaphragm
350
1.2 4.3 8.4 5.5
(0.047) (0.169) (0.331) (0.217)
Half-bridge, used in pairs, 13 mm
(0.5") diameter diaphragm
nominal resistance
500
2- 4-3+ 1+
-S
Diaphragm
MAX V* TEMP
STRAIN GAGES
To Order (Specify Model Number)
MODEL NO. OF 5 ()A B C D(Vrms) TERMINATION COMP
Shown
actual size,
12.3 mm
Leads not
shown
DISCOUNT SCHEDULE
1 to 10 pkgs . . . . . . . . . . . . . . . . . . .Net
11 to 24 pkgs . . . . . . . . . . . . . . . . . .5%
25 to 49 pkgs . . . . . . . . . . . . . . . . .10%
50 and up and OEM . .Consult Factory
SGT-7/350-LD11 $54.50 350 3.5 Ribbon Leads ST
SGT-7/350-LD13 54.50 350 5 Ribbon Leads AL
SGT-7/350-LD41 44.50 350 3.5 Solder Pads ST
SGT-7/350-LD43 44.50 350 5 Solder Pads AL
PRICE NOM.
PER RESIS-
PKG TANCE
DIMENSIONS
mm (in)
GRID CARRIER
MAX V* TEMP
0.5 2.5 12.3 5.8
(0.02) (0.098) (0.484) (0.228)
Full-bridge, 7 mm (0.28")
diameter diaphragm
350
For dimensions key, see page E-41.
Maximum permitted bridge energizing voltage (Vrms).
*
Note: For strain gage accessories see pages E-56 to E-59. Ordering Example: SGT-8/350-LD11, package of 5, half bridge linear
diaphragm pattern, $54.50.
LD11, LD13, LD41 or LD43.
**
E-40
NOTE
ST = Steel AL = Aluminum
E
Page 2
E-39
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
Leads not
shown
Leads not
shown
Leads not
shown
Leads not
shown
Leads not
shown
-S
+S
-S
+S
Gage 2-
Gage 3+
Gage 4-
Gage 1+
-Exc
+Exc
Page 3
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