SLT 5.0

  • Maximum Range​ of Sensor
    32 ft (10m)
  • Accuracy​
    ±0.25% of Range
  • Options
    Plug and Play Relay and Data Logger
  • Operating Modes
    Level, Range or Open Channel Flow
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SLT 5.0 Level & Flow Monitor

Use this versatile instrument to continuously measure, display, transmit and control liquid level in storage tanks and pumping stations, or to monitor and totalize Open Channel Flow through any flume or weir. Mount the non-contacting ultrasonic sensor above the liquid being measured and install the watertight electronics enclosure nearby. Features a user-friendly keypad calibration system, backlit LCD display, an isolated 4-20mA output and 2 programmable control relays.

Calibration is easy with the built-in 5 button keypad. The SLT 5.0 offers simple menu selection of measurement units (gallons, liters etc.), calculates volume in horizontal round tanks, or flow rate (and total) through any flume or weir.

For hazardous locations, the ultrasonic sensor is rated Intrinsically Safe with an optional safety barrier. The standard PVC and Teflon Sensor is rated for measurement ranges up to 32 ft/10 m, or select optional sensors for flange-mount or applications requiring longer measurement range. Options include 4 additional control relays (6 total) and a built-in 2-million point Data Logger with USB output to Flash memory sticks.

General Specification
Electronics Enclosure 

Watertight and dust tight NEMA4X (IP 66) polycarbonate with clear, shatterproof cover 

Accuracy ±0.25% of Range or 2 mm (0.08") whichever is greater, Repeatability and Linearity: ±0.1% 

White, backlit matrix - displays flow rate, totalizer, relay status, operating mode and calibration menu 

Operating Modes

Level, Range or Open Channel Flow 

Programming built-in 5-key calibrator with English, French or Spanish language selection
Power Input 100-240VAC 50-60Hz (see Options), 3.5 Watts maximum (with standard features)
Output Isolated 4-20mA, 1000 ohm load maximum, programmable offset
Control Relays 2 form 'C' dry contacts rated 5 amp SPDT; programmable level alarm, pump control, pump alternation, failsafe/echo-loss, air temperature alarm
Electrical Surge Protection  Sensor, 4-20mA and AC power input
Operating Temp. (electronics) -5° to 140°F (-20° to 60°C)
Sensor Specification
Maximum Range 

32 ft (10 m) with standard PZ32T sensor (Optional sensors for longer ranges) 

Deadband (Blanking) Programmable, Minimum 12 in (305 mm)
Beam Angle

8°, Locate sensor 1 ft (300 mm) from tank sidewall for every 10 ft (3 m) depth

Operating Frequency

42 KHz

Exposed Materials PVC and Teflon
Operating Temperature  40° to 150°F (-40° to 65°C) with automatic temperature compensation
Operating Pressure 20 psi (1.35 bar) maximum
Sensor Cable RG62AU coaxial, 25 ft (7.6 m) standard length (See Options)

No maintenance Sensor Specify SLT 5.0 for inventory monitoring and level control of chemicals, wastewater, viscous or corrosive liquids. Built-in control relays are programmable for pump control, pump alternation and level alarms.

Displays, transmits and totalizes wastewater flow through any flume or weir.

Features a simple, password protected calibration system, automatic totalizer and flow proportionate control relays.