SYR Water Level Controller 933.2, DN20 without Interlock

The water level limiter 933 is used to protect boilers in hot water heating systems from burnout due to lack of water. Installation is mandatory for closed heating systems according to DIN EN 12828 with a heating capacity of more than 300 kW. For boilers with a lower heating capacity, installation is mandatory if it cannot be ruled out that impermissible overheating may occur in the event of a lack of water. In addition, the water level limiter 933 can be used wherever water level-dependent electrical switching operations are to be triggered and a testing option without lowering the water level is required.
The water level limiter 933 is designed as a device with magnetic transmission of the float movement to a microswitch and allows testing without lowering the water level. The electrical switching unit can be rotated by 360° and replaced without draining the system. The water level limiter 933.2 does not interlock after switching off. An interlock must therefore be provided in the subsequent electrical circuit.
Technical data:
Operating pressure: max. 10 bar
Operating temperature: max. 120 °C
Max. ambient temperature: max. 70 °C
Protection class: IP 65
Microswitch: changeover contact 1-pole
Installation position: main axis vertical
Switch contact rating: 10 (4) A / 250 V AC
TÜV component identification no.: TÜV - HWB - 16-190
VDE certificate no.: 139223