The VR-21 SED and VR-41 SED are vibrating rods designed to detect the level of sediment or solid material that has settled in a tank containing liquids. The vibrating rod vibrates in water and then stops vibrating when solid material reaches the level of the probe. When wired to a horn or alarm panel, personnel are alerted when the sediment has reached the probe and the sediment needs to be removed from the tank. The VR-21 SED is the standard model with a 7.37” insertion length and is recommended for use on the tank wall. The VR-41 SED model is a rigid extended vibrating rod for top mounting applications and is custom made with extensions from 13” up to 13’ long, dependent on the needs of the application.

The VR-21 SED and VR-41 SED are commonly used in the water and wastewater industry where the sensor is used to detect the level of salt, lime, chemicals, silt and sediment that has settled in tanks at water treatment plants. The VR-21 and VR-41 SED can also be used for other applications in food and beverage manufacturing, chemical or metal processing, pulp and paper making, and at mining operations. Applications include measuring sediment in brine tanks or soak tanks, detecting sand or silt that has settled in tanks at quarries or mines, timely removal of sand and dirt at pumping stations or measuring manure or compost that has settled in refuse vessels. Alternative uses include detecting the level of materials such as ash, carbon, lime, silt and mud once they have settled under water.

Features:
• Unique “blade” probe design reduces false alarms caused by buildup
• No calibration required
• Wear and maintenance free
• No moving parts
• Three sensitivity adjustments
• Universal power supply
• Self-cleaning sensor
• Remote electronics available
• Custom lengths from 19” to 19’
• Switch selectable high/low fail-safe

Specifications:
• Power Requirements: Wide range 20-250V AC/DC
• Relay: DPDT
• Time Delay: 1 second from stop of vibration, 2 to 5 seconds for start of vibration
• Ambient Temp: -4°F to +140°F (-20°C to +60°C)
• Process Temp: To 176°F standard
• (80°C); to 284°F high temp (140°C)
• Pressure: 145 psi
• Enclosure: Die cast aluminum, NEMA 4, 5 & 12
• Probe: 304 stainless steel, 13” to 13’ insertion length
• Mounting: 1-1/2” NPT
• Materials Densities: From 1.25 lb./cu. ft.

Applications:
• Detects the level of sediment and solid material settled in a tank containing liquids
• Used to detect the level of salt, lime, chemicals, silt and sediment at water treatment plants
• Food and beverage manufacturing, chemical or metal processing, pulp and paper making and mining operations
• Measure sediment in brine or soak tanks or sand and silt in tanks at mines or quarries
• Ash, carbon, lime, silt and mud settled under water
• Coarse and fine sediment in tanks at hydroelectric power stations