Solinst Model 201 Water Level Temperature Meter

The Model 201 Water Level Temperature (WLT) Meter is ideal for measuring static water levels, as well as profiling temperature in wells, boreholes, tanks and open water.

Accurate temperature measurements are clearly displayed on an LCD readout on the faceplate, from -20ºC to +125ºC. 

Water level and probe depth measurements are read off the Solinst durable laser marked flat tape. Tape lengths are available up to 2000 ft (600 m).

Also from Solinst, the Model 107 TLC Meter measures water level, temperature and conductivity. (See Model 107 TLC Meter Data Sheet). For datalogging of water level and temperature, see the Model 3001 Levelogger Edge.

Water Level & Temperature Probe

The 201 Probe is made of high quality 316 stainless steel. The pressure-proof probe can be submerged to 1000 ft (300 m). The zero measurement point on the probe is close to the tip, keeping water displacement at a minimum. A probe shroud protects the sensor tip.

The temperature sensor is located at the stainless steel tip of the probe, however, since the probe body acts as a heat sink, best accuracy is obtained when the probe is completely submerged.  The tape seal plug design allows the probe to be easily replaced, if required. 

Water Level Temperature Meter Features

• Accurately measure temperature from -20ºC to +125ºC

• Tape lengths to 2000 ft (600 m)

• Durable, corrosion and chemical-resistant flat tape

• Standard 9V alkaline battery gives 90 hours of use

• Automatic shut-off after 8 minutes

• Sturdy, standalone reel with ergonomic handle and brake

• No user calibration is required

113362          201 Water Level Temperature Meter, PT/LM2/100ft

113364          201 Water Level Temperature Meter, PT/LM2/200ft

113365          201 Water Level Temperature Meter, PT/LM2/300ft

113366          201 Water Level Temperature Meter, PT/LM2/30m

113367          201 Water Level Temperature Meter, PT/LM2/60m

113368          201 Water Level Temperature Meter, PT/LM2/100m

113413          201 Water Level Temperature Meter, PT/LM2/1150m

113414          201 Water Level Temperature Meter, PT/LM2/500ft

113415          201 Water Level Temperature Meter, PT/LM2/250m

113416          201 Water Level Temperature Meter, PT/LM2/750ft

113417          201 Water Level Temperature Meter, PT/LM2/300m

113418          201 Water Level Temperature Meter, PT/LM2/1000ft

Water Level & Temperature Applications1000ft

Water temperature has a direct affect on the biological activity of aquatic plants and animals, as well as many aspects of water quality and chemistry; therefore, it is an important parameter to monitor.

The Model 201 Water Level Temperature Meter is ideal for:

• Profiling temperature in wells and open water

• Detecting runoff, points of inflow, or other sources of thermal pollution

• Early warning of changes in water quality, including dissolved oxygen levels and conductivity

• Monitoring and predicting changes in aquatic environments • Geothermal drilling and studies

WLT Meter Specifications

Temperature range: -20.00°C to +125.00°C

Temperature reading accuracy: +/-0.10ºC from -5ºC to +50ºC; +/-0.50ºC outside of that range

Temperature resolution: 0.01ºC Temperature stabilization time: 15 seconds per ºC

Probe pressure rating: Submersible to 1000 ft (300 m).

Probe weight: 3.07 ounces (87 grams)

Probe size: 5/8" dia., 5.08" long (16 mm x 129 mm)

Wetted materials (tape/probe): PVDF, Santoprene, Delrin, Viton,  316 stainless steel

Battery life: 90 hours

Auto-off: 8 minutes

Standard Tape lengths: Meters: 30, 60, 100, 150, 250, 300 Feet: 100, 200, 300, 500, 750, 1000
® Delrin and Viton are registered trademarks of DuPont Corp. 

WLT Meter Measurement Principles

When the zero point of the 201 Probe enters water, an electric circuit is completed, activating the buzzer and light. The depth to water is then read off the flat tape.

Temperature readings are read off the LCD display. As the probe is lowered to take temperature measurements at discrete depths, the buzzer can be turned off by pressing the button two times quickly. This is ideal when profiling temperature. 

A Tape Guide allows depth measurements to be read at the marked position on the Tape Guide, to give reliable, repeatable, accurate depth measurements when profiling a well. The Tape Guide protects the tape from damage on rough edges of well casing.

Laser Marked Flat Tape

The WLT Meter uses extremely durable flat tape. The tape is non-stretch and has a dog bone design that prevents adherence to wet surfaces. The tape reels smoothly, remains  flexible and hangs straight, regardless of temperature. It is also easy to repair and splice.

The 3/8" (10 mm) wide tape has permanent laser markings every 1/100 ft. or each millimeter, traceable to NIST and EU measurement standards.

LM2:  Feet and tenths: with markings every 1/100 ft.

LM3:  Meters and centimeters: with markings every mm

Water Temperature Display Menu

When the meter is turned on, the LCD screen displays the firmware version of the WLT Meter (e.g. “WLTM 1.0”) for about two seconds. The LCD will then display the temperature reading, in or out of water.

The LCD menu is simple to operate. Pressing the button two times quickly deactivates the buzzer (the light stays active).
 To reactivate, press the button two times quickly. To turn the meter off, press and hold the button for two seconds.