Pressure switches designed for automatic burner controls, for usage in furnace, ventilation and air conditioning applications. It is suitable for switching a circuit on, off or over on changes in actual pressure value relative to the set reference value. The reference value (switching point) is adjusted on a setting wheel provided with a scale. The test nipple is integrated in metal housings as standard.
LGW A4 Dungs can be used as differential pressure switches for air and as an over-pressure switch for gas. Maximum operating pressure: 500 mbar, setting ranges between 0.4÷3.0 mbar. Ambient and medium temperature -15÷70oC, storage temperature -30÷80oC. Switching voltage: DC gold contacts 5÷24 V, silver contacts 24÷48 V; AC 24÷250 V. Nominal current: DC 20 mA - Au; (AC 10 A - Ag). Degree of protection IP 54.
LGW A4 Function:
The differential pressure acts via the diaphragm against the force of the setting spring on the microswitch. The pressure switch operates without auxiliary power.
- Differential pressure switch LGW...A4:
The switching mechanism responds to differential pressure which acts between the two pressure chambers. It switches an electric circuit on, off or over when the set reference value is exceeded or undershot. - Over-pressure switch LGW...A4, Pressure connection G 1/4:
Single-acting pressure switch in the overpressure range. The switching mechanism responds if there is an overpressure which switches on, off or over to an electric circuit if the set reference value is exceeded or undershot. The pressure connection, G 1/8 must not be closed. - Vacuum switch LGW...A4, Pressure connection G 1/8:
Single-acting pressure switch in the low pressure range. The switching mechanism responds to vacuum which switches an electric circuit on, off or over when the set value is exceeded or undershot. The pressure connection, G 1/4 must not be closed.
Type key LGW A4 pressure switch
| General | |
| Maximum operating pressure | 500 |
| Pressure setting range | 5 - 150 |