Omega Engineering BCM-1 Instruction Sheet

BCM-1
Bridge Completion Module
M1760/1106
INSTRUCTION
SHEET
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DESCRIPTION

The OMEGA ® BCM-1 Bridge Completion Module provides
a convenient means of completing the Wheatstone Bridge
circuit used for strain gage measurements. The module
can be used for quarter bridge measurements with 120 or
350 ohm gages or for half bridges with gages of any
resistance. Quarter bridges with two or three wire hookup
can be accommodated. In addition, a bridge balance
adjustment potentiometer is provided to zero the bridge
output. Screw terminals are provided for strain gage,
excitation, and output signal connections.
The BCM-1 is constructed using precision resistors with 5
PPM/°C temperature coefficient for maximum temperature
stability. The unit is completely encapsulated for use in
rugged environments and can be mounted by using the
screw holes provided in the baseplate.

MOUNTING

The BCM-1 module is equipped with a baseplate which
provides holes for screw mounting. Where required, it can
also be glued or secured in place with double-sided tape
or Velcro.

SPECIFICATIONS

Maximum Excitation
120 Ohm Bridge:
350 Ohm Bridge:
Temperature Limits:
Temperature Effects:
Zero Adjust:
Resistor Tolerance:
Resistor TEMPCO:
Dimensions:
Mounting Holes:
10 VDC
16 VDC
-20 to 80°C
(-4 to 176°F)
±1.5 microvolts/volt/°C
±6 mV/V
±0.1%
5 PPM/°C
3.0" W x 1.25" H x 1.0" D
(50.8 mm x 31.8 mm x
25.4 mm)
0.175" holes (2) on
2.5" center

BCM-1 HOOKUP

Connections to the BCM-1 are made using the screw
terminals on the top of the unit using stripped wires. One
side has four terminals used for excitation and signal
output connections. The excitation voltage is connected to
the outer terminals labeled +EX and -EX. The readout
device is connected to the two center terminals which are
labeled + and - Vout.
Connection of the strain gages to the BCM-1 depends on
the particular application. For the proper hookup, refer to
Figures 1-3.
* FOR 2 WIRE
GAGES INSTALL
JUMPER FROM
+SIG TO
120 TERMINAL
FIG.1 1/4 Bridge 120Ω Hook-Up Figure 1. 1/4 Bridge 120Ω Hook-up
* FOR 2 WIRE
GAGES INSTALL
JUMPER FROM
+SIG TO
350 TERMINAL
Figure 2. 1/4 Bridge 350Ω Hook-up
FIG.2 1/4 Bridge 350Ω Hook-Up
FIG.3 1/2 Bridge Hook-Up Figure 3. 1/2 Bridge Hook-up
BCM-1
+BRG +BRG
+SIG
120
*
350
-BRG
BCM-1
+BRG +BRG
+SIG
120
350
*
-BRG
BCM-1
+BRG +BRG
+SIG
120
350
-BRG