Data Sheet for Product
QBM81-… Differential Pressure Switch Technical Instructions
Document Number CA1N1552E-P25
November 24, 2003
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners.
© 2003 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc
1000 Deerfield Parkway
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Dimensions
All dimensions in inches
(millimeters)
4
1.58
(40)
ø3.19 (ø81)
3.47 (88)
1
2
3
3.52
(89.4)
1.75
(44.4)
0.98
(25)
0.75
(19)
ø0.24
(ø6.2)
0.87
(22)
3.60
(91.4)
2.01
(51)
P1
P2
SMIS0081R1
5
Legend:
1 Mounting bracket
2 P1 connection, higher pressure
3 P2 connection, lower pressure
4 Pressure differential scale (factory-sealed with paint)
5 Setpoint knob
Figure 5. QBM81-… Differential Pressure Switch Dimensions.
ø
0.26
(
ø6.5)
ø
0.26
(
ø6.5)
2 x
ø
0.13
(2 x
ø3.4)
ø
0.63
(
ø16)
3.09
(78.5)
2.36
(60)
SMIS0082R1
Figure 6. Duct Adapter Dimensions.
NOTE: Two duct adapters are supplied with the pressure switch.
Buffalo Grove, IL 60089-4513
U.S.A.
them to technical.editor@siemens.com
Page 5
Document No. CA1N1552E-P25
Printed in the U.S.A.