ISCO 750 Operating instructions

750 Area Velocity Module
Installation and Operation Guide
Part #60-9003-465
Copyright © 1996. All rights reserved, Isco, Inc.
Revision E, January, 2003

Foreword
This instruction manual is designed to help you gain a thorough understanding of the
operation of the equipment. Isco recommends that you read this manual completely
before placing the equipment in service.
Although Isco designs reliability into all equipment, there is always the possibility of a
malfunction. This manual may help in diagnosing and repairing the malfunction.
If the problem persists, call or email the Isco Customer Service Department for assis-
tance. Contact information is provided below. Simple difficulties can often be diag-
nosed over the phone. If it is necessary to return the equipment to the factory for
service, please follow the shipping instructions provided by the Customer Service
Department, including the use of the Return Authorization Number specified. Be
sure to include a note describing the malfunction. This will aid in the prompt
repair and return of the equipment.
Isco welcomes suggestions that would improve the information presented in this man-
ual or enhance the operation of the equipment itself.
Contact Information
Phone: [phone] (USA, Canada, Mexico)
[phone] (Outside North America)
Repair Service: [phone] (Analytical and Process
Monitoring Instruments)
[phone] (Samplers and Flow Meters)
Fax: [phone]
Email address: [email protected]
Website: www.isco.com
Return equipment to: 4700 Superior Street, Lincoln, NE 68504-1398
Other correspondence: P.O. Box 82531, Lincoln, NE 68501-2531

750 Area Velocity Module
Safety
750 Area Velocity Module
Safet y
General Warnings Before installing, operating, or maintaining this equipment, it is
imperative that all hazards and preventive measures are fully
understood. While specific hazards may vary according to
location and application, take heed in the following general
warnings:
WARNING
Liquids associated with this instrument may be classified
as carcinogenic, biohazard, flammable, or radioactive.
Should these liquids be used, itis highly recommended that
this application be accomplished in an isolated
environment designed for these types of materials in
accordance with federal, state, and local regulatory laws,
and in compliance with your company’s chemical/hygiene
plan in the event of a spill.
AVERTISSEMENT
Eviter de répandre des liquides dangereux. Les liquides qui
sont analysés dans cet instrument peuvent être
cancérigènes, hasards biologiques, inflammables, ou
radioactifs. Si vous devez utiliser tels liquides, il est très
recommandé que vous le faites à l'intérieur d'un
environnement isolé conçu pour tels liquides. Cet
environnement isolé devrait être construit selon les
règlements fédéraux, provinciaux, et locaux, aussi que le
plan de votre compagnie qui concerne l'évènement d'un
accident avec les matières hasardeuses.
WARNING
Avoid hazardous practices! If you use this instrument in
any way not specified in this manual, the protection
provided by the instrument may be impaired.
AVERTISSEMENT
Éviter les usages périlleux! Si vous utilisez cet instrument
d’une manière autre que celles qui sont specifiées dans ce
manuel, la protection fournie de l’instrument peut être
affaiblie; cela augmentera votre risque de blessure.
WARNING
If this system uses flammable organic solvents, Isco
recommends that you place this system in a well-ventilated
environment, designed for these types of materials. This
environment should be constructed in accordance with
federal, state, and local regulations. It should also comply
with your organization’s plan concerning chemical and

750 Area Velocity Module
Safety
hygiene mishaps. In all cases use good laboratory
practices and standard safety procedures.
AVERTISSEMENT
Ce système peut utiliser des dissolvants organiques
inflammables. Pour réduire le péril qui peut être causé par
l'accumulation des vapeurs explosives, Isco recommande
que vous installez ce système dans un environnement
bien-aéré qui estconçu pour les matières hasardeuses. Cet
environnement devrait être construit selon les règlements
fédéraux, provinciaux, et locaux. Aussi, il devrait se
conformer au plan de votre organisation qui concerne les
mésaventures de l'hygiène ou de chimique. En tout cas,
utilisez toujours de pratiques bonnes de la laboratoire et
des procédures standardes de la sûreté.
Hazard Severity Levels This manual applies Hazard Severity Levels to the safety alerts,
These three levels are described in the sample alerts below.
CAUTION
Cautions identify a potential hazard, which if not avoided, may
result in minor or moderate injury. This category can also warn
you of unsafe practices, or conditions that may cause property
damage.
WARNING
Warnings identify a potentially hazardous condition, which
if not avoided, could result in death or serious injury.
DANGER
DANGER – limited to the most extreme situations
to identify an imminent hazard, which if not
avoided, will result in death or serious injury.

i
750 Area Velocity Module
Table of Contents
Section 1 Introduction
1.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
1.2 Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.3 Power Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.4 Principles of Area/Velocity Flow Measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.4.1 Level Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
1.4.2 Velocity Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Section 2 Installation and Programming Basics
2.1 Installation Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.1.1 Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2 Programming Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
2.2.1 Programmed Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.3 Selecting a Site . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.4 Selecting a Flow Conversion Method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.4.1 Flow Conversion Without a Primary Device . . . . . . . . . . . . . . . . . . . . . . . . 2-6
2.4.2 Flow Conversion With a Primary Device . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.5 Measurements for Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
2.6 Levels and Channel Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.7 Offsets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.8 Data Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.9 Minimum Depth for Velocity Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
2.10 Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2.11 Sampler Run Time Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.12 Data Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
2.12.1 Recovering Module Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Section 3 Maintenance
3.1 Cable Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.2 Desiccant Reactivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
3.3 Repair of the Module and Probe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.4 How to Get Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.5 Flash Memory and Software Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.6 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
List of Figures
2-1 6712 Programming: 750 Module Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2-2 6712 Programming: 750 Module Setup Screens . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
2-3 6712 Programming: 750 Module Quick View Screens . . . . . . . . . . . . . . . . . . . . . . 2-5
2-4 Ideal Conditions - Uniform Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2-5 Poor Conditions - Disturbed Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2-6 Offset Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2-7 Determining Minimum Depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11
2-8 Report Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14

750 Area Velocity Module
Table of Contents
ii
List of Tables
1-1 Technical Specifications for the 750 Area Velocity Module . . . . . . . . . . . . . . . . . . 1-2
1-2 Technical Specifications for the Standard AV Sensor . . . . . . . . . . . . . . . . . . . . . . 1-2
1-3 Technical Specifications for the Low Profile AV Sensor . . . . . . . . . . . . . . . . . . . . 1-3
2-1 Flow Conversion Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

1-1
750 Area Velocity Module
Section 1 Introduction
1.1 Overview The Model 750 Area Velocity Module is one of Isco’s inter-
changeable modules for the 6700 Series Samplers. The module
enhances sampler operation by providing flow-pacing and addi-
tional sampler enable conditions. The sampler also displays the
real-time level, velocity, flow rate, and total flow provided by the
module. The sampler records this data for later analysis.
The area velocity (AV) sensor detects the average velocity of a
liquid as it moves up or downstream. The sensor, equipped with
an internal pressure transducer, also measures the level of the
flow stream. Three AV sensor models are available:
• Standard range sensor – has a 25 ft (7.6 m) cable and a
pressure transducer with a 10 ft (3.05 m) level
measurement range.
• Extended range sensor – has a 50 ft (15.2 m) cable and a
pressure transducer with a 30 ft (9.14 m) level
measurement range.
• Low profile sensor – has a 25 ft (7.6 m) cable and a
pressure transducer with a 10 ft (3.05 m) level
measurement range. Its smaller size allows velocity
measurements at very low liquid depths.
The Technical Specifications for each sensor can be found in
Tables 1-2 and 1-3.
WARNING
The 750 module has not been approved for use in
hazardous locations as defined by the National Electrical
Code. Installation of this module in a hazardous location
may cause fire or explosion, resulting in death, personal
injury, or property damage. Before installing any device in
a dangerous location, review safety precautions in your
sampler manual. Check any applicable guidelines, codes,
and regulations of federal, state, city, and county agencies.

750 Area Velocity Module
Section 1 Introduction
1-2
1.2 Technical
Specifications
The technical specifications for the 750 module and Standard
and Low Profile probes are listed in the following tables.
General notes:
• All weights may vary by ± 0.2 lb (0.1 kg).
• All lengths may vary by ± 0.25 inches (0.64 cm)
Table 1-1 Technical Specifications for the 750 Area Velocity Module
Weight 0.9 lbs (.4 kg)
Sensor Dimensions 4.9 ×5.7 ×2.0 inches (12.4 ×14.5 ×5.1 cm)
Material Polystyrene
Operating Temperature 0° to 140°F (-18° to 60°C)
Storage Temperature -40° to 140°F (-40° to 60°)
Enclosure Rating NEMA 4X and 6, IP67
Power 9 to 14 VDC provided by the sampler
Memory Nonvolatile ROM (Flash). Can be field updated through the sampler.
Level Resolution 0.002 ft (0.0006 m)
Velocity Resolution 0.024 ft/s (0.0073 m/s)
Velocity Accuracy -5 to +5 ft/s: ± 0.1 ft/s (-1.5 + 1.5 m/s: ± 0.03 m/s)
2% of reading) (1.5 to 6.1 m/s: ±2% of reading)
Readings Programmable through the sampler at 1, 2, 5, 10, 15, and 30 minute inter-
vals. All readings are stored in the sampler.
Table 1-2 Technical Specifications for the Standard AV Sensor
Weight Standard Range
Extended Range
2.1 lbs (.96 kg)
3.9 lbs (1.8 kg)
Sensor Dimensions Length: 6.6 inches (6.8 cm)
Width: 1.6 inches (4.1 cm)
Height: 1.2 inches (3.0 cm)
Nose Angle 35° from horizontal
Cable Length Standard Range
Extended Range
25 ft (7.6 m)
50 ft (15.2 m)
Materials Sensor: Polybutadiene-based polyurethane, stainless-steel
Cable: Polyvinyl chloride (PVC) chlorinated polyvinyl chloride (CPVC)
Operating Temperature 32° to 160°F (0° to 71°C)
Level Measurement Method Submerged pressure transducer mounted in the flow stream
Transducer Type Differential linear integrated circuit pressure transducer
Level Measurement Range
Standard Range
Extended Range
0.05 to 10.0 ft (0.015 to 3.05 m)
0.05 to 30.0 ft (0.015 to 9.14 m)

750 Area Velocity Module
Section 1 Introduction
1-3
Maximum Allowable level
Standard Range
Extended Range
20 ft (6.1 m)
40 ft (12.2 m)
Level Measurement Accuracy
Standard Range
Extended Range
0.033 to 5.0 ft: ± 0.008 ft/ft (0.01 to 1.52 m: ± 0.008 m/m)
>5.0 ft: ± 0.012 ft/ft (>1.52 m: ± 0.012 m/m)
0.05 to 15.0 ft: ± 0.03 ft (0.015 to 4.57 m: ± 0.009 m)
0.05 to 21.0 ft: ± 0.09 ft (0.015 to 6.40 m: ± 0.027 m)
0.05 to 30.0 ft: ± 0.30 ft (0.015 to 9.14 m: ± 0.090 m)
@77°F (25°C). Includes non-linearity, repeatability, and hysteresis. Does
not include temperature coefficient.
Compensated Temperature Range 32° to 100°F (0° to 38°C)
Temperature Coefficient
Standard Range
Extended Range
0.05 to 4.0 ft: ± 0.005 ft/°F (0.015 to 1.22 m: ± 0.0027 m/°C)
4.0 to 10.0 ft: ± 0.007 ft/°F (1.22 to 3.05 m: ± 0.0038 m/°C)
0.05 to 30.0 ft: ± 0.008 ft/°F (0.015 to 9.14 m: ± 0.0044 m/°C)
Maximum error over compensated temperature range, per degree of tem-
perature change.
Velocity Measurement Method Doppler Ultrasonic
Frequency 500 kHz
Typical minimum depth for velocity
measurement
0.25 ft (75 mm)
Range -5 to +20 ft/s (-1.5 to +6.1 m/s)
Table 1-2 Technical Specifications for the Standard AV Sensor (Continued)
Table 1-3 Technical Specifications for the Low Profile AV Sensor
Weight 2.1 lbs (.95 kg) including cable and connector
Sensor Dimensions Length: 6.00 inches (15.2 cm)
Width: 1.31 inches (3.3 cm)
Height: 0.75 inches (1.9 cm)
Nose Angle 110° from horizontal
Wetted Sensor Material Epoxy, chlorinated polyvinyl chloride (CPVC), Stainless-steel
Cable Material Polyvinyl chloride (PVC), chlorinated polyvinyl chloride (CPVC)
Cable Length 25 ft (7.6 m)
Maximum Distance (between sensor
and module)
75 ft (22.8 m) with optional extension cables. The distance can be extended
up to 1000 ft (300 m) with the optional Quick Disconnect Box.
Operating Temperature 32° to 122°F (0° to 50°C)
Storage Temperature -40° to 160°F (-40° to 71°)

750 Area Velocity Module
Section 1 Introduction
1-4
1.3 Power Sources We recommend using a Lead-Acid battery or a new 913 or 923
power pack when using the Model 750 Area Velocity Module. A
nickel-cadmium battery may not be sufficient to finish a sample
routine. For example, a nickel-cadmium battery should be
expected to complete five sampling routines of 24 samples, each
sample 200 ml, at one sample per hour with a 10 foot suction line
and a 5 foot head. But if the routine is changed to flow-paced
sampling or enabling the routine with a level, velocity, or flow
rate condition, the battery capacity is significantly reduced.
1.4 Principles of
Area/Velocity Flow
Measurement
Area velocity flow conversion requires three measurements:
level, velocity, and channel dimensions. The AV sensor provides
the level and velocity measurements. You provide the third mea-
surement, channel dimensions, during module programming.
The flow conversion is best represented as two steps. First, the
module calculates the channel cross-section (or area) using the
programmed channel dimensions and the level measurement.
Next, the module multiplies the channel cross section and the
velocity measurement to calculate the flow rate.
1.4.1 Level Measurement The AV sensor’s internal differential pressure transducer mea-
sures the liquid level. The transducer is a small piezo-resistive
disk that detects the pressures transferred by a stainless steel
diaphragm. The outer face of the diaphragm is exposed to the
flow stream through the ports at the rear of the sensor. The inner
face is exposed, or referenced, to the atmosphere through the
internal vent tube that runs the full length of the sensor’s cable.
Level Measurement Range 0.033 to 10.0 ft (0.01 to 3.05 m)
Maximum Allowable level 20 ft (6.1 m)
Level Measurement Accuracy 0.033 to 5.0 ft: ± 0.008 ft/ft (0.01 to 1.52 m: ± 0.008 m/m)
>5.0 ft: ± 0.012 ft/ft (>1.52 m: ±0.012 m/m)
Accuracy per foot of change from calibrated depth @77°F (25°C). Includes
non-linearity and hysteresis.
Temperature Coefficient ±0.0023 ft/°F (±0.0013 m/°C)
Maximum error within operating temperature range at zero pressure (per
degree of change from calibration temperature).
Maximum Long-term Drift 0.033 ft (±0.010 m)
Velocity Measurement Method Doppler Ultrasonic
Frequency 500 kHz
Transmission Angle 20° from horizontal
Typical minimum depth for velocity
measurement
0.8 ft (25 mm)
Range -5 to +20 ft/s (-1.5 to +6.1 m/s)
Velocity Accuracy -5 to +5 ft/s (-1.5 to +1.5 m/s): ± 0.1 ft/s (±0.03 m/s)
5 to 20 ft/s (1.5 to 6.1 m/s): 2% of reading
Velocity accuracy for a uniform velocity profile in water with a
speed-of-sound of 4850 ft/s.
Table 1-3 Technical Specifications for the Low Profile AV Sensor (Continued)

750 Area Velocity Module
Section 1 Introduction
1-5
The difference between the pressures exerted on the diaphragm
is the hydrostatic pressure. The transducer converts the hydro-
static pressure to analog signals. The signals are sent to the
module.
Because pressure is proportional to the level of the stream, the
module can convert the analog signal to a level measurement.
The level measurement, in turn, is applied to the channel
cross-section.
1.4.2 Velocity Measurement The AV sensor measures average velocity by using ultrasonic
sound waves and the Doppler effect. The Doppler effect states
that the frequency of a sound wave (or other wave) passed from
one body to another is relative to both their motions. As the two
approach each other, the frequency increases; as they move
apart, the frequency decreases.
The AV sensor contains a pair of ultrasonic transducers. One
transducer transmits the ultrasonic sound wave. As the trans-
mitted wave travels through the stream, bubbles and particles
carried by the stream reflect the sound wave back towards the
AV sensor. The second transducer receives the reflected wave.
The module compares the frequencies of the sound waves. An
increase or decrease in the frequency of the reflected wave indi-
cates forward or reverse flow. The degree of change is propor-
tional to the average velocity of the flow stream.

750 Area Velocity Module
Section 1 Introduction
1-6

2-1
750 Area Velocity Module
Section 2 Installation and Programming Basics
The 750 can be used in a wide range of applications. In the “Flow
Meter” mode of operation, the module will produce sound results
if you properly choose an installation site, select an appropriate
flow conversion method, and program the module with accurate
measurements. Guidelines for each are discussed in the following
sections.
If you plan to use the “Level Only” mode of operation, the section
Selecting a Flow Conversion Method does not apply.
2.1 Installation Summary To install the module:
1. Turn the sampler off.
2. Remove the connector cap in the module bay and move it
aside.
3. Slide the module into the bay.
4. Push against the module so the connector is fully seated.
To remove the module, turn the sampler off. Press the silver
button and pull the module from the bay. Replace the connector
cap in the module bay.
2.1.1 Installation Checklist 1. Check the desiccant cartridge. Make sure the desiccant is
active (blue in color) and remove the red cap.
2. Install the module and turn the sampler on.
3. Install the AV sensor in the channel.
4. Connect the AV sensor cable to the module.
5. Program the sampler and calibrate the module’s level read-
ing.
6. Set up the sampler. See details in the sampler manual.
7. Run the program.
2.2 Programming Notes You should install the module before turning the controller on.
When the controller is turned on, it looks for a module. The con-
troller will not recognize a newly installed module if it is not seen
during this power-up routine. If you install a module while the
controller is already on, turn the controller off and then on again
to reconfigure the controller for use with the module.
When the controller is configured with the module, it adds the
necessary screens for programming. The screens appear in
Figures 2-1 through 2-3. These figures outline the steps for
module programming and calibration. For 6712 programming
and general programming information, see the sampler manual.

750 Area Velocity Module
Section 2 Installation and Programming Basics
2-2
2.2.1 Programmed Enable When the 750 is installed, additional sampler enable options are
available. If programmed for LEVEL ONLY, the additional
options are LEVEL and VELOCITY. If programmed for FLOW
METER, the additional options are LEVEL, VELOCITY, and
FLOW. For more information about programmed enables, see the
sampler manual.
2.3 Selecting a Site The 750 is designed to measure flow in open channels without a
primary device. A primary device is a hydraulic structure, such
as a weir or a flume, that modifies a channel so there is a known
relationship between the liquid level and the flow rate.
The area velocity module’s use is not limited to channels without
a primary device. The software also supports installations where
you must install the sensor with a primary device.
Note
Primary devices limit the usefulness of the area velocity sen-
sor’s readings. In most cases, levels and velocities near these
devices do not represent what normally occurs in the channel.
If you must use area velocity flow conversion, or if your interest
is the stream’s velocity, do not install the sensor near a primary
device. Move the sensor away to where the flow is unaffected.
When the sensor is installed without a primary device, find a
section of channel with a minimum of disturbances to the flow.
Avoid areas with elbows, outfalls, inverts, junctions, etc., that
create turbulence near the AV sensor. The sensor should be
located away from these disturbances to a point where the flow
has stabilized. For best results, install the sensor where the flow
is most uniform. Uniform flow is a condition where the water
surface is parallel to the bottom of the channel.
If the sensor is installed in a primary measuring device, its
location depends on the type of primary device. Most primary
devices have a specific place for the head (level) measurement
device. For more details about the location of the head measuring
point, refer to the Isco Open Channel Flow Measurement
Handbook, or to information provided by the manufacturer of
the primary device.

750 Area Velocity Module
Section 2 Installation and Programming Basics
2-3
Figure 2-1 6712 Programming: 750 Module Screens
DATA STORAGE
INTERVAL IN MINUTES:
1 2 5
10 15 30
SELECT UNITS FOR
LENGTH:
ft m
INTERVAL CHANGED--
SELECT UNITS FOR
FLOW RATE:
cfs gps gpm Mgd
lps m3s m3h m3d
SELECT UNITS FOR
FLOW VOLUME:
cf gal Mgal
m3 lit
SELECT UNITS FOR
VELOCITY
fps mps
PROGRAM MODULE?
YES NO
NEW MODULE SETUP--
DOWNLOAD DATA NOW
OR LOSE ALL DATA!
DONE
If applicable
MODULE INSERTED--
6712 SAMPLER
STANDARD PROGRAMMING
For HELP at any
screen press ? key
6712 SAMPLER
EXTENDED PROGRAMMING
For HELP at any
screen press ? key
RUN
PROGRAM
VIEW REPORT
OTHER FUNCTIONS
RUN “EXTENDED 1”
PROGRAM
VIEW REPORT
OTHER FUNCTIONS
SITE DESCRIPTION
“FACTORY”
CHANGE?
YES NO
PROGRAM NAME
“EXTENDED 1”
CHANGE?
YES NO
CURRENT LEVEL IS
__.__ ft
ADJUST LEVEL TO
__.__ ft
ZERO LEVEL OFFSET:
__.__ ft
MINIMUM DEPTH FOR
VELOCITY MEASUREMENTS
IS: 2 3 4 inches Does not apply to
Low Profile sensors
__.__ ft
ARE YOU SURE?
YES NO
This screen appears when the
adjustment differs from the
current reading by more than
0.5 feet.
See Sampler Manual
See Sampler Manual
This screen appears only when a module has been
changed or if the module was unplugged while the
sampler was powered.
If applicable.. This screen appears
only when the interval has been
changed.
NOTE:
To program the module or
run a program that requires
a module, you must plug in
the module before turning
on the 6712 controller
Standard
Extended
DOWNLOAD DATA NOW
OR LOSE ALL DATA!
DONE
DOWNLOAD DATA NOW
OR LOSE ALL DATA!
DONE
See Figure 2-2.
Continue with sampler programming.
See sampler manual.

750 Area Velocity Module
Section 2 Installation and Programming Basics
2-4
Figure 2-2 6712 Programming: 750 Module Setup Screens
NOTE 1:
The slope and roughness screen
only appears during Manning
Equation Programming
MODE OF OPERATION
FLOWMETER
LEVEL ONLY
FLOW CALCULATION:
AREA-VELOCITY
LEVEL TO FLOW RATE
FLOW CONVERSION:
WEIR FLUME
DATA POINTS
MANNING
LEVEL TO AREA:
CHANNEL SHAPE
DATA POINTS
V-NOTCH
RECTANGULAR
CIPOLETTI
PALMER-BOWLUS
PARSHALL
TRAPEZOIDAL
H
V-NOTCH WEIR ANGLE:
120 90 60
45 30 22.5
END CONTRACTIONS ON
RECTANGULAR WEIR?
YES NO
ENTER CREST LENGTH:
_.__ ft
(min, max)
Weir
Flume
PALMER-BOWLUS SIZE:
4” 6” 8” 10”
12” 15” 18” 21”
24” 27” 30” 48”
PARSHALL SIZE:
1” 2” 3” 6” 9”
1’ 1.5’ 2’ 3’ 4’
5’ 6’ 8’ 10’ 12’
TRAPEZOIDAL SIZE:
2” 45 WSC
12” 45 SRCRC
LG 60 V
H FLUME SIZE:
0.5’ 0.75’ 1.0’
1.5’ 2.0’ 2.5’
3.0’ 4.5’
ROUND PIPE
U-CHANNEL
RECTANGULAR CHANNEL
TRAPEZOIDAL CHANNEL
________________
SLOPE = __.___ ft
ROUGHNESS = __.___
TRAPEZOIDAL CHANNEL
TOP WIDTH = __.___ ft
BOTTOM = __.___ ft
HEIGHT = __.___ ft
RECTANGULAR CHANNEL
WIDTH = __.___ ft
ROUND PIPE
DIAMETER = __.___ ft
See Note 1.
EDIT DATA POINTS
CLEAR DATA SET
SELECT NEW SET
CHANGE NAME
DATA SET __________
ABCDEFGHIJKLMNOPQRST
UVWXYZ -&”0123456789
BACKUP DONE
DATA SET “1”
DATA SET “2”
DATA SET “3”
DATA SET “4”
CLEAR DATA SET!
ARE YOU SURE?
YES NO
(ft, cfs)
1. (____.____)
2. (____.____)
3. (____.____)
Level to flow rate shown.
PLEASE WAIT!
...SORTING DATA
INVALID ENTRY!
...DUPLICATE DEPTH
SAVE CHANGES?
YES NO
Stop
Continued from Figure 2-1 or 2-3.
Continue on Figure 2-1 or 2-3.

750 Area Velocity Module
Section 2 Installation and Programming Basics
2-5
Figure 2-3 6712 Programming: 750 Module Quick View Screens
DATA STORAGE
INTERVAL IN MINUTES:
1 2 5
10 15 30
UNITS SELECTED
LENGTH: ft
UNITS SELECTED:
FLOW RATE: cfs
FLOW VOLUME: Mgal
VELOCITY: fps
AREA VEL MODULE
AREA VELOCITY
ROUND PIPE
CURRENT LEVEL IS
__.__ ft
__.__ ft OFFSET
2” MINIMUM DEPTH
MODULE INSERTED--
6712 SAMPLER
STANDARD PROGRAMMING
For HELP at any
screen press ? key
6712 SAMPLER
EXTENDED PROGRAMMING
For HELP at any
screen press ? key
RUN
PROGRAM
VIEW REPORT
OTHER FUNCTIONS
RUN “EXTENDED 1”
PROGRAM
VIEW REPORT
OTHER FUNCTIONS
SITE DESCRIPTION
“FACTORY”
PROGRAM NAME
“EXTENDED 1”
SITE DESCRIPTION
“FACTORY”
CURRENT LEVEL IS
__.__ ft
ADJUST LEVEL TO
__.__ ft
ZERO LEVEL OFFSET:
__.__ ft
MINIMUM DEPTH FOR
VELOCITY MEASUREMENTS
IS: 2 3 4 inches Does not apply to
Low Profile sensors
__.__ ft
ARE YOU SURE?
YES NO
This screen appears when the
adjustment differs from the
current reading by more than
0.5 feet.
See Sampler Manual
See Sampler Manual
This screen appears only when a module has been
changed or if the module was unplugged while the
sampler was powered.
NOTE:
To program the module or
run a program that requires
a module, you must plug in
the module before turning
on the 6712 controller
Standard
Extended
SELECT UNITS FOR
LENGTH:
ft m
SELECT UNITS FOR
FLOW RATE:
cfs gps gpm Mgd
lps m3s m3h m3d SELECT UNITS FOR
FLOW VOLUME:
cf gal Mgal
m3 lit
SELECT UNITS FOR
VELOCITY
fps mps
__ MINUTE
STORAGE INTERVAL
DOWNLOAD DATA NOW
OR LOSE ALL DATA!
DONE
Continue with sampler programming.
See sampler manual.
See Figure 2-2.

750 Area Velocity Module
Section 2 Installation and Programming Basics
2-6
2.4 Selecting a Flow
Conversion Method
The 750 is capable of determining flow rates using either area
velocity conversion or level-to-flow rate conversion. A list of
available flow conversions appears in Table 2-1, Flow Conversion
Methods.
2.4.1 Flow Conversion
Without a Primary
Device
There are several conversion options if you install the sensor in a
channel without a primary device. The method you choose
depends on the channel shape or the amount of information
available to define the channel’s characteristics.
Area velocity flow conversion is the method of choice for round
pipe, U-channel, rectangular, and trapezoidal channels. Non-
standard channels can still use area velocity flow conversion, but
you must provide at least three level-to-area data points. The
data points define the cross-sectional area of the channel at
various levels.
Table 2-1 Flow Conversion Methods
Conversion Type Device, Formula, or Table Size or Parameters
Area-Velocity Channel Shape Area ×Velocity Round Pipe, U-Channel, Rectan-
gular, Trapezoidal
Level-to-area
Data Points User-developed Table 3 to 50 data points
Level to Flow Weir V-Notch Weir 22.5, 30, 45, 60, 90, 120 degrees
Rectangular Weir with end con-
tractions
Crest Length
Rectangular Weir without end
contractions
Crest Length
Cipoletti Weir Crest Length
Flume Palmer-Bowlus Flume 4, 6, 8, 10, 12, 15, 18, 21, 24, 27,
30, 48 inches
Parshall Flume 1, 2, 3, 6, 9 inches
1, 1.5, 2, 3, 4, 5, 6, 8, 10, 12 feet
Trapezoidal Flume Large 60-degree V
2-inch, 45-degree WSC
12-inch, 45-degree SRCRC
“H” Flume 0.5, 0.75, 1, 1.5, 2, 2.5, 3, 4.5 feet
Manning Equation Round Pipe Slope, Roughness, Diameter
U-Channel Pipe Slope, Roughness, Width
Rectangular Pipe Slope, Roughness, Width
Trapezoidal Slope, Roughness, Bottom Width,
To p W i d t h
Level-to-Flow Rate
Data Points User-developed tables for level-to-flow rate
3 to 50 data points