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2151 Intrinsically Safe Area Velocity Flow Meter, with two 6V alkaline batteries and RS232 Barrier Communication Cable

Part Number: 682000008Product Details

Overview

CSA approved for Class 1, Division 1 environments
The 2151 Flow Meter is the intrinsically safe version (CSA approved for Class 1, Div 1 environments) of the 2100 series Area Velocity Flow Meter. To ensure proper application, the 2151 uses a distinctive color, and has connectors that are compatible only with other intrinsically safe 2100 Series components. Highly efficient power management provides battery life up to 8 months.

The area velocity method gives you greater accuracy where weirs and flumes are not practical, and where submerged, full pipe, surcharged, and reverse flow conditions may occur. You don't have to estimate the slope and roughness of the channel, and silt correction allows you to compensate for debris that accumulates on the bottom of the channel.

Isco Flowlink 4 Software is required to set up the 2151, and to retrieve and analyse stored data. All data is stored in "flash" memory, protecting your data against glitches that can cause other storage technologies to lose your valuable data forever.
Features

• Up to 8 month battery life. 2151 reads out battery voltage to let you know when to change batteries.
• Rugged, submersible enclosure is permanently sealed to meet NEMA 4X, 6P and IP68 requirements
• Easy to upgrade. New operating software can be downloaded into non-volatile "flash" memory via PC connection, without affecting stored program and data.
• Measure shallow flows in small pipes. The low profile Area Velocity sensor minimises flow stream obstruction and senses velocity in flows down to 25mm (1") in depth.
• Chemically resistant. The epoxy-encapsulated sensor withstands tough applications.
• Rollover memory with variable rate data storage, lets you change the data storage interval when programmed conditions occur.
• Pressure transducer venting system automatically compensates for changes in atmospheric pressure to maintain accuracy
• Quick connect area velocity sensor can be easily removed and interchanged in the field with no recalibration.
• High-capacity internal desiccant cartridge keeps the vent free of moisture during normal operation
• Replaceable hydrophobic filter protects against intrusion of water during submersion.
• Sealed AV sensor resists fouling by oil and grease, eliminating frequent cleanings needed with electromagnetic probes.
• 38.4k baud communication provides speedy setup and data retrieval.

Benefits

Principles of Operation
Our Area Velocity flow modules use continuous-wave Doppler technology to measure mean velocity. The sensor transmits an ultrasonic pulse, then measures the frequency shift of pulses reflected by air bubbles and particles in the flow.

A differential pressure transducer in the sensor measures liquid depth to determine flow area. Flow rate is then calculated by multiplying the area of the flow stream by its average velocity.

The 2151 is powered by two alkaline batteries. Highly efficient power management provides battery life up to 8 months in a typical setup.

Software Features
• Stores battery voltage information to let you know when to change batteries.
• Easy to upgrade. New operating software can be downloaded into non-volatile "flash" memory without affecting stored program and data.
• Rollover memory with variable rate data storage lets you change the data storage interval when programmed conditions occur.
• 38.4k baud communication provides speedy setup and data retrieval.
• A 25-foot barrier cable provides safe, in-the-field connection to a laptop computer with 9-pin sub-D serial port.

Applications

• Open channel flow measurement in hazardous locations (ATEX Category 1G, up to Class 1, Div 1, Groups C & D).
• Level measurement in explosive or potentially explosive areas, such as manholes, digesters and storage tanks
• Portable and permanent-site AV flow monitoring for inflow and infiltration, sewer overflow, and other sewer studies.

Specifications

Part Number: 682000008
0.03m to 1.52m (0.033 ft to 5.0 ft) ±0.008 m/m (±0.008 ft/ft)
-1.5 to +1.5 m/s (-5 to +5 ft/s) ±0.03 m/s (±0.1 ft/s)
1.5 to 6.1 m/s (5 to 20 ft/s) ±2% of reading
15 minute Interval 8 months
5 minute Interval 4.5 months
Baud Rate 38400
Cable Diameter 0.9cm (0.37")
Cable Length 7.6m (25 ft)
Channel Shapes Round, U-shaped, rectangular, trapezoidal, elliptical, with silt correction
Compensated Range 0°C to 50°C (32°F to 122°F)
Data Points Up to 50 level-flow rate points
Data Points Up to 50 level-area points
Data Storage Memory Non-volatile flash; retains stored data during program updates. Capacity 395000 bytes (up to 79000 readings, equal to over 270 days of level and velocity readings at 15 minute intervals, plus total flow and input voltage readings at 24 hour intervals)
Data Types Level, velocity, flow rate 1, flow rate 2, total flow 1, total flow 2, input voltage
Enclosure NEMA 4X, 6P IP68 (self-certified)
Equation 2-term polynominal
Flow Rate Conversions Up to 2 independent level-to-area conversions and/or level-to-flow rate conversions
Flumes Parshall, Palmer-Bowlus, Leopold-Lagco, trapezoidal, H, HS, HL
Greater than 1.52m (5.0 ft) ±0.012 m/m (±0.012 ft/ft)
Manning Formula Round, U-shaped, rectangular, trapezoidal
Material High-impact molded polystyrene
Materials Sensor - Epoxy, chlorinated polyvinyl chloride (CPVC), stainless steel
Cable - Polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC)
Maximum Allowable Level 6.1m (20 ft)
Maximum Long-Term Drift 0.010m (0.033 ft)
Method Submerged pressure transducer mounted in the flow stream
Method Doppler ultrasonic, Frequency 500 kHz, Transmission Angle 20° from horizontal
Operating Temperature -18°C to 60°C (0°F to 140°F)
Operating Temperature 0°C to 71°C (32°F to 160°F)
Power 6.6 to 16.6V DC, 100 mA typical at 12V DC, 1 mA standby
Program Memory Non-volatile, programmable flash; can be updated using PC without opening enclosure; retains user program after updating
Range 0.010m to 3.05m (0.033 ft to 10 ft)
Range -1.5 to +6.1 m/s (-5 to +20 ft/s)
Setup and Data Retrieval Serial connection to IBM PC or compatible computer with Isco Flowlink 4 Software.
Size (H × W × D) 21.3cm × 28.7cm × 19.3cm (8.4" × 11.3" × 7.6"), including battery compartment
Size (H × W × L) 1.9cm × 3.3cm × 15.2cm (0.75" × 1.31" × 6.00")
Storage Interval 15 or 30 seconds; 1, 5, 15, or 30 minutes; or 1, 2, 4, 12, or 24 hours. 5 Bytes per reading.
Storage Mode Rollover with variable rate data storage based on level, velocity, flow rate 1, flow rate 2, total flow 1, total flow 2, or input voltage
Storage Temperature -40°C to 60°C (-40°F to 140°F)
Temperature Coefficient ±0.0019 m/°C (±0.0035 ft/°F) (Maximum error within compensated range, per degree of change from calibration temperature.)
Total Flow Calculations Up to 2 independent, net, positive or negative, based on either flow rate conversion
Transducer Type Differential linear integrated circuit pressure transducer
Typical Minimum Depth 25mm (1")
Weight 2.4kg (8.2 lbs)
Weight (including cable) 0.95kg (2.1 lbs)
Weirs V-notch, rectangular, Cipolletti, Isco Flow Metering Inserts, Thel-Mar

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