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 a 4-20mA signal output. The sensor is programmed via the integral push button display module. Each relay can be configured on a single set point alarm or latched on two set points for automatic fill or empty in simplex, duplex or triplex 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
- 4-20 mA output provides local or remote process level monitoring
- LCD display indicates level height in engineering units and relay status
- Narrow 2” or 3” beam width for applications with limited space
- Short 4” or 8” dead band maximizes the filling capacity of the tank
- PVDF transducer and NEMA 4X PC enclosure for corrosive liquids
- Automatic temperature compensation for accurate measurement
PRICING
| P/N | Description | From |
|---|---|---|
| LU74-5004 | 5.5m (18′) range, 95-250 VAC, 2″ NPT | $1,100.00 |
| LU74-5064 | 5.5m (18′) range, 95-250 VAC, 2″ G | $1,110.00 |
| LU77-5004 | 3m (9.8′) range, 95-250 VAC, 1″ NPT | $1,035.00 |
| LU77-5064 | 3m (9.8′) range, 95-250 VAC, 1″ G | $1,045.00 |
| LU78-5004 | 8m (26.2′) range, 95-250 VAC, 2″ NPT | $1,165.00 |
| LU78-5064 | 8m (26.2′) range, 95-250 VAC, 2″ G | $1,175.00 |
DOCUMENTATION
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)
Signal output: 4-20 mA, two-wire, isolated, sinking
Signal excitation: 12 to 28 VDC
Loop resist: 500 Ohms @ 24 VDC
Signal fail-safe: 4 mA, 20 mA, 21 mA or hold last
Dead band: LU77: 4” (10cm), LU74/78: 8” (20cm)
Beam width: LU77: 2” (5cm), LU74/78: 3” (7.6 cm)
Configuration: Push button
Memory: Non-volatile
Display type: LCD, 6 characters
Display units: Inch, cm, percent, feet or meter
Display indication: Level and relay status
Supply voltage: 95-250 VAC
Consumption: 20 watts @ 120 VAC
Contact type: Relay 1: SPDT, Relay 2 & 3: SPST N.O.
Contact rating: 2A, 30 VDC, 60W (DC), 125 VA 220 VDC, 250 VAC
Contact fail-safe: Programmable
Process temp.: F: -7° to 140°, C: -20° to 60°
Temp. comp.: Automatic
Ambient temp.: F: -40° to 160°, C: -40° to 71°
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: RoHS
Approvals: CE
PRODUCT SELECTION
If you want help in selecting a sensor for your application, please submit a Level Questionnaire. An engineer will review your requirements and suggest a product solution via email.
