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BCM-2-350R Series
®
Bridge Completion Module
Description
Strain gage instrumentation is readily available with builtin bridge completion resistors and “dummy” gages to
accept quarter- and half-bridge strain gage input circuits.
However, if the instrumentation at hand is not provided with
these components, or if the measurement application does
not permit their use, external bridge completion must be
provided, and the BCM-2-350R Series Bridge Completion
Module can be an excellent choice in these applications.
The BCM-2-350R Series Bridge Completion Module employs
metal-foil resistance elements, bonded to a dense ceramic
substrate. The resistance elements are specially processed
to “match” the thermal expansion coefcient of the ceramic,
resulting in a very low resistance temperature coefcient
equivalent to ±0.27µ
circuits, and ±0.63µ
over a temperature range from –18 °C to +95 °C
[0 °F to +200 °F]. Maximum operating temperature range is
–45 °C to +120 °C [–50 °F to +250 °F].
Each module is covered with a special environmental
protection system to ensure long-term stability. A rugged
aluminum overlay, embossed with a wiring diagram for
easy terminal identication, affords additional protection,
and in many applications no supplementary environmental
protection is required. Each module is provided with foam
tape for easy attachment to the test-part surface or at the
instrumentation site, and tinned, heavy copper terminals
facilitate attachment of up to 0.64 mm diameter [22-gage]
leadwires.
ε/°C [±0.15µε/°F] for the half-bridge
ε/°C [±0.35µε/°F] for the dummy gages,
Completing the bridge circuit at the strain gage site provides
for a symmetrical, balanced leadwire system between the
strain gage circuit and the instrumentation. This can reduce
effects of noise pickup in the leadwire system in some
environments. Where switch contacts, slip rings, or other
mechanical connections are employed between the strain
gages and measuring instrumentation, or when leadwires
will be periodically disconnected from the measuring
instrument, accuracy can be improved by completing the
bridge at the measurement site. Bridge completion modules
can be designed to meet special circuit requirements.
Specications and Ordering Guide
Module Type Features
Provides a precision 350 Ω half bridge as well as 120 Ω and 350 Ω dummy
gages. Recommended for use with half-bridge strain gage circuits of any
BCM-2-350R
Improving the world, one measurement at a time.
resistance value, or with 120 Ω or 350 Ω three-wire quarter-bridge circuits.
Size (including foam tape): 25 mm x 25 mm x 5 mm [1 in x 1 in x 0.2 in
Weight: 6 g
TM
UNIVERSAL
FLOW MONITORS
Bridge Excitation (Volts)
Recommended Maximum
0.5 V to 15 V
0.5 V to 25 V
20 V (D120)
35 V (D350)
DS-BCM-2-350R
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