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Use
CC1N7221en
27.10.2005
QPLx2...
Pressure Switches
The pressure switches are used for monitoring gas or air pressures.
When the pressure falls below or exceeds the adj usted switching point, the re-
spective electrical circuit will be opened or changes over.
The QPL... / QPH... and this Data Sheet are intended for use by OEMs which inte-
grate the pressure switches in their products.
•
For the supervision of air or gas pressures in gas trains of gas-fired equipment (gas
burners)
•
The QPL... / QPH... are available as pressure switches for minimum or maximum
pressure
•
Suited for pressure ranges up to 500 mbar
•
Suited for gases of gas families 1, 2 and 3 and other neutral gaseous media
7
QPLx5... / QPHx5...
QPL...
QPH...
Building Technologies
HVAC Products
221
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Summary of Contents for Siemens QPL Series
- Page 1 QPLx2… QPLx5… / QPHx5… Pressure Switches QPL… QPH… The pressure switches are used for monitoring gas or air pressures. When the pressure falls below or exceeds the adj usted switching point, the re- spective electrical circuit will be opened or changes over. The QPL...
- Page 2 Warning notes To av oid injury to persons, damage to property or the environment, the following warning notes should be observed! Do not open, interfere with or modify the pressure switch! • All activities (mounting, installation and service work, etc.) must be performed by qualified staff •...
- Page 3 Standards and certificates Conformity to EEC directives - Electromagnetic compatibility EMC (immunity) 89 / 336 / EEC - Directive for gas-fired appliances 90 / 396 / EEC - Pressure sensing devices for gas burners and gas-fired EN 1854 appliances QPLx2… (CE 0063 BL 1455) QPLx5…...
- Page 4 Type summary When ordering, please give type reference according to «Type summary». Pressure switches with automatic reset: Pressure switches Pressure range ¼“ connection O-ring connection Bauform QPL… for minimum 1.5...10 mbar QPL22.010A00 ¹) QPL12.010A00 ¹) QPLx2 pressure 2.5...50 mbar QPL22.050A00 QPL12.050A00 QPLx2 12.5...75 mbar QPL22.075A00 ¹) QPL12.075A00 ¹) QPLx2...
- Page 5 Technical data General data Switching voltage DC / ACeff max. 250 V Switching current - QPLx2… ACeff max. 10 A at cosϕ 1 AC eff. max. 2 A at cosϕ 0.5 AC eff. min. 20 mA DC max. 1 A DC min.
- Page 6 Function Function with automatic reset. Pressure switches for Switch opens the electrical circuit when the air or gas pressure falls below the set minimum pressure value. Pressure switches for Switch opens the electrical circuit when the air or gas pressure exceeds the set value. maximum pressure Connection diagram Pressure switch for minimum pressure...
- Page 7 Gas inlet s (side a nd bottom ) op tio nal Mou nting side (optional) Note: Dime nsions for reference only Switch contacts © 2005 Siemens Building Technologies HVAC Products GmbH Subject to change! Building Technologies CC1N7221en HVAC Products 27.10.2005...