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Level Scout

Manufacturer: YSI
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Accurate measurements, rugged design, and easy data management make the Level Scout ideal for groundwater monitoring, long-term surface water studies, resource management, aquifer/pump tests, soil vapor extraction, wastewater intake monitoring and leachate monitoring.

The Level Scout is a vented, titanium transducer with 4 mb memory. The field cable features new, in-line vent filter that easily fits in a 1-inch well and does not require any maintenance since there is no desiccant to replace. Instead of using a replaceable desiccant, the filter vents the transducer to the atmosphere to compensate for changes in barometric pressure through a waterproof patch. All vent tubes are internal to the vent filter so there is no need to worry about crimping the tube and affecting the readings. The cables are available with either a polyurethane jacket or a more chemically-resistant ETFE jacket.

Key Features

  • User-replaceable batteries prevent costly down time and reduces long-term costs
  • User-selectable reading rates allow you to get up to 15 readings per second!
  • Built in sampling modes include linear, linear average, event triggered, and logarithmic
  • Accuracy is +/-0.05% of FS
  • Broadcast data via SDI-12, RS232, or RS485 to a data collection platform
  • Zero maintenance field cable
  • 400,000 data points
Data management is easy with Data Scout desktop software or Data Scout Mobile software for a pocket PC. Software is included with the purchase of any Level Scout instrument.

Approximate Weights

  • Transducer with batteries: 0.70 lbs (318g)
  • Cable assembly (less cable): 0.15 lbs (57g)
  • Cable: 0.05 lbs/ft (79 g/m)
  • Suspension wire: 0.005 lbs/ft (8 g/m)

Batteries, Internal

  • 2 each 1.5 V AA alkaline recommended

Battery Life

  • 3 years, 15-minute sampling intervals w/alkalines

Communication Interface

  • RS-485; 3 volt p-p differential w/selectable baud rates from 1200 to 19200

Communication Protocol

  • SDI-12 ver 1.3 compliant

Dimensions

  • Diameter: 0.75" (19.0 mm)
  • Length: 12.44" (316.00 mm)

External Excitation

  • 6 to 16 VDC

External Input Current

  • Avg current during measurement: 8.0 mA
  • 15 mS peak current during page writes: 25.0 mA
  • Quiescent 0.25 mA

Protection Rating

  • IP-68, NEMA 6P, RoHS, On-board surge protection

Temperature

  • Compensated: 14 to 104° F (-10 to 40° C)
  • Operating: -4 to 122° F (-20 to 50° C)
  • Storage without batteries: -40 to 176° F (-40 to 80° C)
  • Storage with batteries: -4 to 122° F (-20 to 50° C)

Temperature Coefficient

  • 0.001 to 0.01%/° C

Full Scale Level Range*

  • 10, 50, 75, 250, 692 ft. H2O (3, 15, 23, 76, 211 m H2O) for vented gauge reference
  • 10, 50, 70, 230, 692 ft. H2O (3, 15, 21, 70, 211 m H2O) for absolute reference

Barometric Pressure Range

  • 8 to 16 psia (55 to 110 kPa) for barometer

Proof Pressure

  • 2.0 x FS

Burst Pressure

  • 3.0 x FS

Sensor Response Time

  • <1 millisecond

Display Time Resolution

  • 1 second

Measurement Resolution

  • 24 bit AD converter

Level

  • ±0.05 %FS TEB1,2 for level ranges >10 ft. (3 m) H2O
  • ±0.10 %FS TEB1,2 for level ranges <= 10 ft. (3 m) H2O

Temperature

  • ±1.0° C Models VS2, VT2, AS2, AT2
  • ±0.2° C Models VS4, VT4, AS4, AT4

Data Upload Time

  • 100 scans/sec pressure and temp with time stamp per second @ 19200 baud rate

Maximum Pressure Scans

  • 393,120 with time stamp

Maximum Pressure and Temperature Scans

  • 288,288 with time stamp

Modes of Sampling (Software Selectable)

  • Linear
  • Linear Avg
  • Event
  • Logarithmic

Pressure Units

  • psi, ft. H2O, mm H2O, cm H2O, m H2O, kPa (user-specified or by slope and offset)

Sampling Rate 3

  • Programmable 8 readings per second max

Time Stamp Accuracy

  • ±2 min/year over compensated temp range
1. Total Error Band (TEB) includes the combined errors due to non-linearity, hysteresis, non-repeatablility, and thermal effects over the compensated temperature range per ISA S51.1

2. Additional error up to <0.1% FS/year may be incurred due to offset drift

3. For sampling rates greater than 3 Hz, the pressure/temperature averaging must be reduced as required

* Special measurement range available upon request

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