Level Switches : LU74-78
EchoSwitch® Ultrasonic Level Switch & Controller
Application
The general purpose ultrasonic level sensor provides continuous level detection up to 26.2' (8m) with 3 programmable relays for level switch or 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 (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
4-20 mA output can be used to provide local or remote level indication
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
Literature
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 |
| Excitation voltage: | 12-28 VDC |
| Loop resist: | 500 Ohms @ 24 VDC |
| Signal fail-safe: | 4mA, 20mA, 21mA, 22mA or hold last |
| 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 |
| Supply voltage: | 95-250 VAC |
| Display units: | Inch, cm, percent, feet or meter |
| Power: | 20 watts @ 120 VAC |
| Contact type: | Relay 1, SPDT relay Relay 2 & 3, SPST, N.O. All commons connected together |
| LCD indication: | Level and relay status |
| Contact rating: | 2A, 30 VDC 60W (DC), 125 VA 220 VDC, 250 VAC |
| Display type: | Level and relay status, 6 character |
| Contact fail-safe: | Programmable / selectable |
| Process temp.: | F: -7° to 140° C: -20° to 60° |
| Temp. comp.: | Automatic |
| Ambient temp.: | F: -40° to 140° 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 |
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