SYR Water Level Limiter 933.1, DN20 with lock

The water level limiter 933 serves to protect boilers in hot water heating systems against overheating 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 water shortage. 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 360° and replaced without draining the system. The water level limiter 933.1 locks after shutdown. Once the fault has been rectified, the system is switched on again using the unlock button on the water level limiter.
Technical data:
Operating pressure: max. 10 bar
Operating temperature: max. 120 °C
Max. ambient temperature: max. 70 °C
Protection class: IP 65
Microswitch: 1-pole changeover switch
Installation position: main axis vertical
Switch rating: 10 (4) A / 250 V AC
TÜV component marking no.: TÜV - HWB - 16-190
VDE identification no.: 139223