Siemens Building Technologies, Inc.
QP Series
Technical Instructions
Document No. 155-292
November 11, 2002
Pressure Switches for Gas and Air
GAS0047R1
mbar
LG
Description
QP… pressure switches are used for gas and air pressure supervision on industrial and
commercial burner applications.
The QPL31… series pressure switches break the electrical circuit when the pressure
drops below the adjusted value.
The QPH31… series pressure switches break the electrical circuit when the pressure
increases above the adjusted value.
Features
• UL listed for USA and Canada, FM approved, ISO 9001 certified;
European approved versions available.
• Adjustable pressure range from 1 to 112 inches water column (WC).
• Automatic and manual reset models.
• Surge protected up to 15 psi.
Product Numbers Table 1.
Pressure Range
Product Number Inches Water
Column (WC)
mbar Execution
QPL31.050M00 1 to 20 2.5 to 50
QPL31.140M00 7 to 55 17.5 to 137
Manual Reset Low
QPH31.050M00 2 to 20 5 to 50
QPH31.150M00 10 to 60 25 to 150
Manual Reset High
QPL31.050A00 1 to 20 2.5 to 50
QPL31.075A00 5 to 30 12.5 to 75
QPL31.280A00 28 to 112 70 to 280
Automatic Reset Low
QPH31.050A00 2 to 20 5 to 50
QPH31.090A00 5 to 35 12.5 to 87
QPH31.280A00 28 to 112 70 to 280
Automatic Reset High
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