Water Level DrawDown Meter Model 101D The 101D Water Level DrawDown Meter has all of the same qualities as our well-known 101 P7 Water Level Meter, with the added feature of a drawdown mode. One simple toggle switches between static water level and drawdown measurements. Water level mode allows accurate depth to water measurements in wells, boreholes, standpipes and tanks. The drawdown function is used to monitor falling hydraulic head during low flow sampling, pumping and other aquifer/well tests. It also ensures a pump’s intake remains submerged during purging or well development. Operating Principles The 101D Water Level DrawDown Meter uses a corrosion resistant stainless steel probe connected to clearly marked flat tape, fitted on a well-designed reel. It is powered by a standard 9 volt battery. In water level mode, when the zero point on the probe enters water, an electronic circuit is completed, activating the buzzer and light. The depth to water is then read off the tape. In drawdown mode, the circuit is reversed —the buzzer and light are triggered when the probe is in air. The battery test button can check the circuit in both water level and drawdown modes. The on/off sensitivity control allows the buzzer to be turned down in cascading water and ensures a clear signal in high and low conductivity conditions. Water Solinst Model 101D Drawdown Water Level Meter Features • Both static water level and drawdown modes in one Meter • One convenient toggle makes it easy to switch between two functions • Uses very durable, accurately laser marked flat tape • Tape lengths up to 5000 ft. (1500 m) • Replacement tapes are interchangeable with other Meters • Has the same robust, submersible probe as the 101 P7 Water Level Meter Water Level DrawDown Meter Applications • Measuring depth to water in wells, boreholes, standpipes and tanks • Monitoring drawdown during: – Low flow groundwater sampling – Well development and purging – Dewatering applications – Pumping, slug, hydraulic conductivity, step and other aquifer/well tests Laser Marked Flat Tape The 101D Water Level DrawDown Meter uses corrosion and chemical-resistant flat tape. The tape is non-stretch and high in tensile strength. The thick dog bone design prevents adherence to wet surfaces and allows the tape to hang straight. It is also easy to repair and splice. The 3/8" (10 mm) tape comes with permanent laser markings every 1/100 ft. or each millimeter, in lengths up to 5000 ft. (1500 m). LM2: Feet and tenths: with markings every 1/100 ft. LM3: Meters and centimeters: with markings every mm Water Level DrawDown Probe The 101D uses the same probe as the 101 P7 Water Level Meter, which is submersible up to 1000 ft. (300 m). The sensor at the tip of the probe provides consistent measurements with almost zero displacement. A protective shroud is included on the probe. The tape seal plug design allows the probe to be quickly and easily replaced if required. Reels With a well-balanced frame, comfortable carrying handle, and handy probe holder, the standard reels are ergonomic and easy to use. They are sturdy and smooth running. The battery is housed in an easy-access drawer in the front of the reel for quick replacement. The reels are equipped with an on/off sensitivity switch, Water Level/Draw Down switch, light, buzzer, battery test button, brake and a tape guide stored on the frame. Standard Length Options The Solinst 101D Water Level DrawDown Meter is available in the following standard lengths: Small Reel 100 ft. 30 m 200 ft. 60 m 300 ft. 100 m Medium Reel 500 ft. 150 m 750 ft. 250 m 1000 ft. 300 m Other Options for Solinst Model 101D Drawdown Water Level Meter Tape Guide/Datum A tape guide is provided with each Meter to prevent damage to the tape from rough edges. It also ensures easy, consistent measurements regardless of who takes readings. It can also provide support for hanging small reels on the casing.
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