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Metal Foil Strain Gauges
for Transducer Application
Designed and manufactured for a wide
range of transducer applications, BCM metal foil strain gauges can be
selected according to the transducer accuracy. When the precision transducers
are concerned (transducer accuracy better than 0.02%FS), it is highly
recommended to use BCM class-A strain
gauges.
If transducer accuracy is relaxed to
0.05%FS, it is wise to choose BCM
class-B strian gauges to achieve cost effective production.
To select a correct gauge for specific transducer application,
you are suggested to first refer to
Strain Gauge Coding System
in order for a better understanding of the gauge part number (P/N).
Listed below is an overview of the specifications
of all those strain gauges. To choose a specific gauge, please look through
the gauge-list in
1. class-A strain gauges ( mostly used to build precision
transducers of accuracy better than 0.02%FS )
In the class-A gauge group, three series strain gauges are
available for selection according to applicaion: ECF-, OCE- and EKF-series.
All the ECF- and OCE-series strain gauges are both temperature- and creep-compensated
strain gauges. For EKF-series gauge, most of them are both temperature-
and creep-compensated gauges, while for a perticular type of strain gauges,
they may possess creep-, temperature- and effective modulus-compensation
as well.
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Strain Gauges for Manufacturing of
Precision Transducers
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ECF series
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EKF series
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ECE series
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| gauge features |
encapsulated gauges with temperature
compensation and creep compensation |
encapsulated gauges with temperature
compensation and creep compensation, modulus compensation available
for a certain gauge type |
encapsulated gauges with temperature
compensation and creep compensation |
| metal foil |
constantan alloy |
karma alloy |
constantan alloy |
| backing material |
modified phenolic resin |
modified phenolic resin |
special epoxy resin |
| cover material |
phenolic resin |
phenolic resin |
|
| nominal resistance (Ω
) |
200, 350, 500, 650, 700, 750,
1000 |
350, 750, 1000, 2000, 3000 |
200, 300, 350, 650, 700 |
| tolerance of resistance |
< ± 0.1 % |
< ± 0.1 % |
< ± 0.1 % |
| gauge factor |
2.00 ~ 2.20 |
1.86 ~ 1.98 |
2.00 ~ 2.16
|
| gauge factor dispersion |
< ± 1 % |
< ± 1 % |
< ± 1 % |
| strain limit |
2.5 % |
2.5 % |
2.0 % |
| fatigue life |
> 10 7 |
> 10 8 |
> 10 7 |
| temp. compensation |
titanium (9), mild steel (11), stainless
steel (16), luminium (23), magnesium (27), plexiglass (65) |
| effective modulus compensation |
not available |
mild steel (M11), stainless steel (M16),
aluminium (M23) |
not available |
| creep compensation |
available |
available |
available |
| working temp. range |
- 30 ~ + 80 °C |
- 30 ~ + 80 °C |
- 50 ~ + 115°C |
| curing temperatures |
135 °C (curing process), 165 °C (post
curing process)
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| bonding adhesives |
B-610 |
B-610 |
B-610 |
| soldering pad finishing |
SP (recommended), SD, RL or
FR |
SD (recommended), RL or FR |
SP |
| lead type (RL or FR) |
silver-plated solid copper round lead (RL: Ø0.15 x 30) or flat ribban (FR: 0.05 x 0.3 x 30); All the diaphragm strain gauges (type KA, KB, KC, and KD) can only have the
round leads (RL), and the flat ribbon leads (FR) is not available for the
KA, KB, KC, and KD diaphragm strain gauges.
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2. class-B strain gauges ( used to build 0.05%FS accuracy
transducers )
In the group of class-B gauges, most of them are only temperature
compensated strain gauges.
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Strain Gauges for Manufacturing of
Transducers of Normal Accuracy
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ECH series |
ECI series |
| gauge features |
encapsulated gauges with temperature
conpensation, good operating flexibility |
encapsulated gauges with temperature conpensation, higher elongation,
wider operating temperature range
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| metal foil |
constantan alloy |
constantan alloy |
| backing material |
phenolic acetal resin |
polyimide resin |
| cover material, or surface
protection |
phenolic acetal cover |
phenolic acetal cover |
| nominal resistance (Ω
) |
200, 350, 500, 650, 1000 |
350 |
| tolerance of resistance |
< ± 0.1 % |
< ± 0.1 % |
| gauge factor |
2.00 ~ 2.20 |
2.00 ~ 2.16 |
| gauge factor dispersion |
< ± 1 % |
< ± 1 % |
| strain limit |
2.5 % |
3 % |
| fatigue life |
> 10 7 |
> 10 7 |
| temp. compensation |
titanium (9), mild steel (11), stainless
steel (16), luminium (23), magnesium (27), plexiglass (65) |
| working temp. range |
- 50 ~ + 80 °C |
compensation
titanium (9), mild steel (11), stainless
steel (16), luminium (23), magnesium (27), plexiglass (65) |
| working temp. range |
- 50 ~ + 80 °C |
- 160 ~ + 150 °C |
| curing temperatures |
135 °C, 180 °C (curing process);
165 °C, 180 °C (post curing process) |
| bonding adhesives |
B-610, B-602, B-502 |
B-610 |
| soldering pad finishing |
SP, RL or FR |
SP, RL or FR |
| lead type (RL or FR) |
silver-plated solid copper
round lead (RL: Ø0.15 x 30) or flat ribban (FR: 0.05 x 0.3
x 30); All the diaphragm strain gauges (type KA, KB, KC, and KD) can only have the
round leads (RL), and the flat ribbon leads (FR) is not available for the
KA, KB, KC, and KD diaphragm strain gauges. |
The specifications of all the listed gauges are subject to change without
notice.
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