Omega M1106, BCM-1, M1760 User Manual

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: 10 VDC
350 Ohm Bridge: 16 VDC

Temperature Limits: -20 to 80°C

(-4 to 176°F)

Temperature Effects: ±1.5 microvolts/volt/°C

Zero Adjust: ±6 mV/V

Resistor Tolerance: ±0.1%

Resistor TEMPCO: 5 PPM/°C

Dimensions: 3.0" W x 1.25" H x 1.0" D

(50.8 mm x 31.8 mm x

25.4 mm)

Mounting Holes: 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.

+BRG+BRG

+SIG

120

350

-BRG

* FOR 2 WIRE
GAGES INSTALL
JUMPER FROM
+SIG TO
120 TERMINAL

FIG.1 1/4 Bridge 120

Ω Hook-Up

BCM-1

+BRG+BRG

+SIG

120

350

-BRG

* FOR 2 WIRE
GAGES INSTALL
JUMPER FROM
+SIG TO
350 TERMINAL

FIG.2 1/4 Bridge 350Ω Hook-Up

BCM-1

+BRG+BRG

+SIG

120

350

-BRG

FIG.3 1/2 Bridge Hook-Up

BCM-1

*

*

Figure 1. 1/4 Bridge 120Ω Hook-up

Figure 2. 1/4 Bridge 350Ω Hook-up

Figure 3. 1/2 Bridge Hook-up

BCM-1

Bridge Completion Module

INSTRUCTION

SHEET

M1760/1106

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It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of its
products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase.
OMEGA’s WARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and
shipping time. This ensures that OMEGA’s customers receive maximum coverage on each product.

If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service Department will issue an Authorized Return (AR)
number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced
at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling,
improper interfacing, operation outside of design limits, improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows
evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or
vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not
warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any
omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided
by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of
defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT
THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total
liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise,
shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential,
incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in
or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear
installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic
WARRANTY/ DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage
whatsoever arising out of the use of the Product(s) in such a manner.

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For immediate technical or application assistance:

U.S.A. and Canada: Sales Service: 1-800-826-6342/1-800-TC-OMEGA

®

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®

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e-mail:[e-mail]
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RETURN REQUESTS / INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO
OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER
TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any
correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR W

ARRANTY RETURNS, please have the following information

available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,

2. Model and serial number of the product under warranty, and

3. Repair instructions and/or specific problems relative to the product.

FOR NON-WARRANTY REPAIRS,

consult OMEGA for current repair charges.

Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,

2. Model and serial number of the product, and

3. Repair instructions and/or specific problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and
engineering. OMEGA is a registered trademark of OMEGA ENGINEERING, INC.

© Copyright 2006 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic
medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.