Application

The general purpose ultrasonic level sensor provides continuous level detection up to 26.2' (8m) with 3 programmable relays for level switch or level control functions, and is configured via the integral push button display module. Each relay can be configured on a single set point (high level alarm or low level alarm) or latched on two set points for automatic fill or empty in simplex (one pump or valve), duplex (two pumps) or triplex (three pumps) level control modes with selectable time delay and fail-safe logic. The embedded level controller can lower cost by replacing external control hardware. This non-contact liquid level sensor is ideally suited for corrosive, sticky or dirty liquids, and is broadly selected for pump lift station, sump and day tank level applications.

Features

	Offered in 3 level detection ranges from 9.8' (3m) to 26.2' (8m)
	Configuration is simple via integral push button display module
	Three programmable relays for switch, pump control and fail-safety
	1 pump or valve with 2 alarms 2 pumps (lead-lag) with 1 alarm 2 pumps (duplexing) with 1 alarm 3 independent switch point alarms
	LCD display indicates level height in engineering units and relay status
	Narrow 2" or 3" beam width for applications with limited measurement space
	Short 4" or 8" dead band maximizes the measureable filling capacity of the tank
	PVDF transducer and NEMA 4X polycarbonate enclosure for corrosive liquids
	Automatic temperature compensation for accurate measurement

Specifications

Range:	LU77: 4" to 9.8' (10cm to 3m) LU74: 8" to 18.0' (20cm to 5.5m) LU78: 8" to 26.2' (20cm to 8m)
Repeatability:	0.25" (6.35mm)
Dead band:	LU77: 4" (10cm) LU74/78: 8" (20cm)
Beam width:	LU77: 2" (5cm) LU74/78: 3" (7.6cm)
Configuration:	Push button
Memory:	Non-volatile
Display type:	LCD, 6-digit
Display units:	Inch, cm, percent, feet or meter
LCD indication:	Level and relay status
Supply voltage:	95-250 VAC
Power:	20 watts @ 120 VAC
Contact type:	(3) SPDT relays
Contact rating:	60 VA, 1A maximum
Contact fail-safe:	Open, close or hold last
Process temp.:	F: -4° to 140° C: -20° to 60°
Temp. comp.:	Automatic
Ambient temp.:	F: -40° to 140° C: -40° to 60°
Pressure:	MWP = 30 PSI (2 bar)
Enclosure rating:	NEMA 4X (IP65)
Encl. material:	Polycarbonate
Encl. hardware:	Brass & stainless
Enclosure vent:	Water tight membrane
Trans. material:	PVDF
Conduit entrance:	Dual, 1/2" NPT
Process mount:	LU77: 1" NPT (1" G) LU74/78: 2" NPT (2" G)
Mount gasket:	Viton®
Classification:	General purpose
Compliance:	CE, RoHS