Ultrasonic Level & Flow Monitor SLT 5.0

  • Measure Level or Open Channel Flow
  • User-Friendly Calibration System
  • Isolated 4-20mA (1000 ohm)
  • False Echo Rejection
  • 2 Programmable Control Relays
  • Electrical Surge Protection
  • Intrinsically Safe Sensor Option
  • Plug and Play Relay and Data Logger Options
  • Description
  • Application Areas
  • Reviews (0)
  • Video
  • Specifications
  • Brochure
  • User’s Guide
  • How It Works

Product Description

  • Measure Level or Open Channel Flow
  • User-Friendly Calibration System
  • Isolated 4-20mA (1000 ohm)
  • False Echo Rejection
  • 2 Programmable Control Relays
  • Electrical Surge Protection
  • Intrinsically Safe Sensor Option
  • Plug and Play Relay and Data Logger Options

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.

Contact AKTEK for specific recommendations in your application.

• For Chemical Tank Level (Tank Inventory and Level Control)
• Sumps and Pump Stations
• Flow through Flumes and Weirs (Open Channel Applications)


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General Specifications

  • Electronics Enclosure: Watertight and dust tight NEMA4X (IP 66) poly-carbonate with clear, shatterproof cover
  • Accuracy: ±0.25% of Range or 2 mm (0.08") whichever is greater,
  • Repeatability and Linearity: ±0.1%
  • Display: White, backlit matrix - displays flow rate, totalizer, relay status, operating model 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, 4-20 mA and AC power input
  • Operating Temp. (electronics): -5° to 140°F (-20° to 60°C)
  • Approximate Shipping Weight: 10 lbs. (4.5 kg)

Sensor Specifications

  • Maximum Range: 32 ft (10 m) with standard PZ32T sensor (Optional sensors for longer ranges)
  • Dead-band (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)

Popular Options

  • Sensors: Long range models / all Teflon construction / intrinsically safe / flange mount
  • Sensor Cable: 50 ft. (15 m) continuous or 100 ft. (30 m) continuous RG62AU coaxial from Sensor, or splice up to 500 ft (150 m) with Junction Box
  • Intrinsic Safety Barriers: For Sensor mounting in Class I,II,III, Div. I,II, Groups C,D,E,F,G hazardous locations
  • Power Input: 9-32 VDC
  • Control Relays: 4 additional (6 total), rated 5 amp SPDT
  • Enclosure Heater: Thermostatically controlled - recommended for temperatures below 32°F (0°C)
  • Data Logger: 2 million point logger with USB output to Flash memory sticks, Windows software
  • Sensor Mounting Stand: For open Channel Flow applications




Ultrasonic Level

Greyline ultrasonic sensors are mounted at the top of a tank or in a position above the liquid being measured. The sensor continuously transmits pulses of high frequency sound (typically 42 kHz) which travel away from the sensor, hit the surface of the liquid and return to the sensor.

The instrument electronics measure the time it takes from transmitted sound to return of the echo. With reference to the speed of sound in air, the exact distance of the liquid surface from the sensor can be calculated with high accuracy (±0.25% of maximum range).

Since the speed of sound is affected by air temperature, Greyline ultrasonic level sensors include a built-in temperature sensor. Level/distance measurements are automatically temperature compensated throughout the operating temperature range of the sensor.

The sensor should be positioned so that it has a clear "view" of the liquid surface and away from ladders, pipes or other obstructions. Greyline recommends 1 ft. from the sidewall for every 10 ft. depth (300 mm for every 3 m depth). False echoes from agitators (sweeping under the sensor), turbulence and waves can be filtered and disregarded by the instrument.

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