A level switch that monitors the minimum and maximum level height, for example, in fire trucks, and also maintains the level height in sumps or pools.

This level switch has two important functions - it monitors the min. and max. level height, e.g., in fire trucks and tanks... it maintains the level height in sumps and pools.

Main Features:

• The function is selected via a jumper on the main board
• The level height is indicated on the device panel
• The device monitors 5 level stages using six probes (one probe is common)
• The common probe can be replaced with a metal (conductive) tank
• Clear indication of level height with six LED indicators on the device panel
• Possibility to connect additional signalling (e.g., for the driver of a fire truck)
• Adjustable sensitivity according to the conductivity of the liquid
• Adjustable time delay - eliminates level movement, e.g., when filling a tank

Technical Specifications:

• Measuring frequency 10Hz to prevent liquid polarization and eliminate network interference
• Power supply 12..24V DC (for use in fire trucks) or galvanically isolated 230V AC for general use
• Relay contact 10A for full/empty tank signalling or pump control (depending on the selected function)
• Function selection FILLING / OFF / EMPTYING via a switch on the device panel
• Protection rating IP65

Probes for Level Relay and Recommended Wires:

• SHR-1-M - level probe with brass electrode
• SHR-1-N - level probe with stainless steel electrode
• SHR-2 - level probe with stainless steel electrode housed in a PVC cover
• SHR-3 - conductive pressure level probe
• Wire D05V-K 0.75/3.2 - wire 1x 0.75 mm² certified for drinking water
• Cable D03VV-F 3x0.75/3.2 - cable 3x0.75 mm² certified for drinking water

HRH-6 Basic Unit - Diagram and Description of Controls

1. Function switch
2. Probe connection cable
3. Additional signalling connection cable
4. Power supply/relay contact cable

• LED6: Level indication L5
• LED5: Level indication L4
• LED4: Level indication L3
• LED3: Level indication L2
• LED2: Level indication L1
• LED1: Power supply voltage indication