4230 Flow Meter
Bubbler level sensing provides the most accurate measurement.

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Isco 4230 Bubbler Flow Meters use an internal air compressor to force a metered amount of air through a bubble line submerged in the flow channel. By measuring the pressure needed to force air bubbles out of the line, the flow level is accurately determined.

Measurement accuracy of the 4230 is not affected by wind, steam, foam or turbulence, nor by suspended solids and rapidly changing head heights that can cause problems for some bubbler flow meters. Because only the bubble tube contacts the flow, corrosive chemicals are not a problem. The 4230 also resists damage by lightning and debris, making it ideal for stormwater applications.

Automatic Drift Compensation makes Isco bubbler flow meters the most accurate level measurement technology. In standby applications such as stormwater runoff monitoring, Automatic Drift Compensation also allows the 4230 to maintain calibration indefinitely. Automatic bubble line purging prevents clogging, and the meter's internal software senses rapidly rising heads and increases the bubble rate to maintain maximum accuracy.

Standard Features

• Built-in flow conversions for most applications, including Manning formula, data points, or equation for special situations.
  
• Two-line x 80-character backlit LCD.
  
• Choice of standard (10 ft) and extended (30 ft) level measurement range.
  
• Built-in dot matrix printer gives you an accurate, on-site printout
  
• Internal memory stores over 2 months of flow, rainfall, parameter, and sample data at 15 minute intervals.
  
• Automatic Drift Compensation eliminates effects of transducer drift and allows the 4230 to maintain level calibration indefinitely
  
• Interfacing for Sampler activation, connection to multiparameter water quality sonde, alarm outputs

Specifications

Size (H x W x D):	17.0 x 11.5 x 10.5 in. (43 x 29 x 26.7 cm) (without power source)
Weight:	17.3 lbs (7.8 kg) (without power source)
Material:	High-impact molded polystyrene structural foam
Enclosure:	NEMA 4X (iP65)
Power:	12 to 14V DC, 16 mA average at 12.5V DC
Typical Battery Life (printer set at 1 in./hr (2.5 cm/hr), 1 bubble per second, 15 minute purge, and continuous level reading interval)
934 Nickel-Cadmium Battery:	7 to 10 days
946 Lead-Acid Battery:	10 to 15 days
948 Lead-Acid Battery:	2 to 3 months
Program Memory:	Non-volatile, programmable flash. Updateable without opening enclosure.
Display:	Backlit LCD, 2-line, 80-character (5.5 mm high x 3.2 mm wide)
Level-to-Flow Rate Conversions
Weirs:	V-notch, rectangular with and without end contractions, Cipolletti
Flumes:	Parshall, Palmer-Bowlus, Leopold-Lagco,Trapezoidal, H, HS, HL
Manning Formula:	Round, U-channel, rectangular, trapezoidal Data Points Four sets of 50 level-flow rate points Equation Two-term polynomial
Totalizers
LCD:	9-digit, floating decimal point, resettable
Mechanical (optional):	7-digit, non-resettable
Inputs and outputs
Rain Gauge Input:	Contact closure, normally open. Resolution 0.01 or 0.004 in ( 0.25 or 0.1 mm)
Parameter Inputs:	pH, dissolved oxygen, conductivity, and temperature (with optional YSI 600 sonde); pH and temperature (with optional Isco 201 Parameter Module); or dissolved oxygen and temperature (with optional Isco 270 Parameter Module)
Sampler Activation Conditions:	Enabled, disabled, AND and OR combinations of any two of level, flow rate, rainfall, pH, DO, conductivity, and temperature
Sampler Pacing Output:	12V pulse
Sampler Input:	Event mark, bottle number
Printer
Recording Modes:	Up to 3 graphs of level, flow rate, pH, DO, conductivity, and temperature vs time; includes totalized flow. Rainfall and sampler events (time and bottle number) are also recorded
Speed:	Off, 0.5, 1, 2, 4 in/hr (1.25, 2.5, 5, 10 cm/hr)
Recording Span:	User selectable with multiple over-ranges
Resolution:	1/240 of recording span
Reports Printed:	Flow meter program, 2 independent time interval reports, flow meter history, sampler history
Interval Report Contents:	Site number; time interval; total flow; minimum, maximum, and average flow rate, level, pH, DO, conductivity, and temperature, and time of occurrence; interval flow; total rainfall; number of samples, flow meter history and sampler history
Character Size (HxW):	0.09 x 0.07 in (2.4 x 1.7 mm)
Paper:	4.5 in. wide x 65 ft. (11.4 cm x 19.8 m), plain white paper, replaceable roll
Ribbon:	19.7 ft. (6.0 m) black nylon, replaceable
Data Storage Memory
Capacity:	80,000 bytes (approx. 40,000 readings) divided into a maximum of 12 memory partitions. Equal to 100 days of level, rainfall, pH, DO, conductivity, and temperature readings at 15 minute intervals, plus 3,000 sample events. Optional expansion to 473,000 bytes (approx 236,500 readings)
Setup and Data Retrieval:	IBM PC or compatible computer with Isco Flowlink 4 for Windows
Communication:	Direct connection, optional internal 2400 baud telephone modem with voice messaging
Data Retrieval (optional):	Isco 581 Rapid Transfer Device (RTD)
Voice Messaging (with optional internal modem):	Calls up to 5 telephone numbers with programmable delay between calls, activated based on AND and OR combinations telephone of any two of level, flow rate, rainfall, pH, DO, conductivity, and temperature
Analog Outputs:	(optional) Up to 3 isolated internal outputs, 0 to 20 mA or 4 to 20 mA, scaleable based on level, flow rate, pH, DO, conductivity, or temperature, into a maximum of 750 ohms each
Relay Outputs:	2 form C relays with field selectable trip points based on flow rate (with optional High/Low Alarm Relays)
Serial Output:	Current status and readings, in response to command or automatically at selectable time intervals, ASCII comma separated values at 1200, 2400, 4800, or 9600 baud
Storage Temperature:	-40° to 140°F (-40° to 60°C)
Operating Temperature:	0° to 140°F (-18° to 60°C)
Bubbler
Range:	0.1 to 10 ft (0.03 to 3.05 m)
Level Measurement Accuracy (Non-linearity, repeatability, and hysteresis at 25°C (77°F). Max error (±) for indicated level range.
0.1 to 5.0 ft (0.03 to 1.52 m):	±0.005 ft (±0.002 m)
0.1 to 7.0 ft (0.03 to 2.13 m):	±0.01 ft (±0.003 m)
0.1 to 10 ft (0.03 to 3.05 m):	±0.035 ft (±0.011 m)
Temperature Coefficient (Maximum error (±) per degree change over compensated range)
For level in feet:	±0.0003 x level x temperature change from 72°F
For level in meters:	±0.0009 x level x temperature change from 22°C
Automatic Drift Correction:	After a 5 minute warm-up period, zero level is corrected to ±0.002 ft. (±0.0006 m) at intervals between 2 and 15 minutes
Long-Term Level Calibration Change:	Typically 0.5% of reading per year
Ambient Range:	0° to 140°F (-18° to 60°C)
Compensated Range:	32° to 140°F (0° to 60°C)