Mainstream Portable Flowmeter

Any 4:20 mA current loop level sensor.
Pulse activation with configurable sensor warm-up time.
Loop current measurement by self-calibrating 16-bit delta-sigma A-D converter.
0-30 mA
Better than 1 µA
Calibration table (maximum 20 points) with built-in interpolator converts loop current into level
measurement. Simple transducer calibration tool included in UI software.
Transducers and calibration data directly interchangeable between Mainstream system units.

Submerged ultrasonic sensor containing signal generator, transmitter, receiver and decoder electronics.
Phase Coherence time delay measurement determines the time for tracers carried by the flow to travel a fixed distance (~ 0.75 mm).
Bi-directional, -5 m/s to -10 mm/s and 10 mm/s to 5 m/s.
Better than 1 mm/s
Ultrasound signal quality monitor gives the percentage of the measurement time that the received ultrasound signal contains useful velocity information.
Each velocity measurement is based on the same quantity of information. Automatically reduces the
measurement time for high flow velocities and high signal qualities and increases the measurement
time for low velocities and low signal qualities.

Flow cross-sectional area calculated from the level measurement and the dimensions of the pipe or channel. Calculation can take into account a specified (constant) silt level. Flow cross-section specification tools included in UI software.
Fluid flow rate calculated by multiplying cross-sectional area by flow velocity. Level-to-flow configuration tool included in UI software.
Three independent flow totalisers calculate forward only, reverse only, and forward-reverse flow quantities. Each totaliser uses separate elements to accumulate hour quantity and total quantity to prevent round-off errors.

Internal 12V battery. Connectors for external 12V and 24V supplies.
Low cost exchangeable deep discharge 12V 7.5 Ah rechargeable battery. One year endurance when operated at 1 measurement per minute. Weight 2.5 kg. Optional internal 12 Ah battery available.
Built-in battery charger maintains internal battery using power from external 24V source. Enables permanent flowmeter operation using solar panel.
Connection for external 12V battery pack for extended measurement period.
Connection for external 15-28V power input compatible with solar panels and industrial 24V supplies.
Power monitoring circuits track supply status. Supply voltages can be displayed on LCD, viewed via the UI, stored in the data logger, and used to control switch outputs. Power supply condition visible on status LED.

Flash file system with 4 Mbyte capacity and data retention of 20 years.
Configurable to record any combination of power supply voltages, level sensor loop current, level,area, ultrasound signal quality, velocity and flow rate, plus forward, reverse and total flow quantities.
Proprietary data compression algorithm for extended logger capacity and rapid data retrieval.
Configurable from 5 seconds to 1 hour.
Logger holds more than one year of data when recording all available measurements at one minute intervals.
Less than 15 seconds to retrieve one month's data recorded at 1 minute intervals. File synchronization capability for fast update of previously retrieved data files.
Spreadsheet compatible .csv file with country specific caption text and date/time format for analysis
and reports. Flash file image file including complete flowmeter configuration for data archives.

RS232 compatible interface with automatic baud rate detection. Supports 1200, 2400, 4800, 9600,14400, 19200, 38400, 57600 and 115200 baud.
Optional external plug-in modem/GSM/GPRS device or short-range radio link with power-on-demand from system unit.
Mainstream Communicator UI software for system configuration, diagnostics, real- time measurement display and data retrieval.

Push to start - push to stop. Requires 10 seconds continuous pressure to switch flowmeter off to prevent accidental de-activation.
High intensity flashing LED indicates system operation and battery status without opening enclosure or entering manhole. LED also indicates activity on communications port.
Two line x 16 character LCD. Automatic activation when integral light sensor detects enclosure is open. Configurable display sequence includes date, time, and any combination of measurement data. Country specific caption text and date/time format.

Selectable from mm, cm, m, in, ft.dimensions) :
Selectable from mm, cm, m, in, ft.
Selectable from m2, cm2, mm2, in2, ft2
Selectable from mm/s, cm/s, m/s, in/s, ft/s, ft/min
Selectable from l/s, m3/s, ft3/s, igal/s, USG/s, l/min, m3/min, ft3/min, igal/min, USG/min, m3/h, ft3/h, m3/d, Ml/d
Selectable from l, m3, Ml, ft3, igal, USG
Independently configurable display format for each measurement. Options are integer, fixed point with 1 to 6 decimal places, and scientific (E-format). Display defaults to scientific format if data cannot be correctly represented in selected format.

Two opto-isolated switches rated at 60V ac/dc and 200 mA maximum current. Each switch independently configurable for state output or pulse output operation.
Switch configurable to respond to any item of measured data with separate switch open and switch close settings to provide hysterisis. Applications include power supply monitoring and control, low ultrasound signal quality indication and level, velocity and flow alarms.
Switch configurable to generate a 2.5 second duration switch closure to indicate a defined flow quantity. Flow totaliser can be forward only, reverse only, or forward- reverse. Applications include sampler control and remote flow totaliser operation.

Titanium, acetal and polyurethane.
185 mm long x 17.5 mm diameter.
8 mm diameter vented polyurethane cable with Kelvar strain cord.
1 kg including standard 10 m cable length
0 to 2 m working. Maximum 8 m overrange.
Better than 1 mm.
Combined effects of non-linearity, hysterisis and repeatability better than 0.25% best straight line.
Non-linearity and offsets removed by transducer calibration.
Fully encapsulated to IP68
-20°C to 60°C (temperature compensated 2°C to 30°C).

Streamlined ?PVC moulding and polyurethane cable.
105 mm long x 50 mm wide x 20 mm high.
8 mm diameter polyeurathane cable with Aramid strain cord. Breaking load 45 kg. Minimum static bend radius 52 mm.
1 kg including standard 10 m cable length.
500 m
Totally encapsulated to IP 68.
-10°C to 85°
20 mm

Ultra high impact structural copolymer polypropylene and stainless steel.
280 mm wide x 250 mm deep x 125 mm high.
5 kg with 7.5 Ah internal battery installed.
Enclosure is IP67. Electronic assembly is encapsulated to IP68 and can operate totally submerged with the enclosure lid open.
-10°C to 70°C