MODEL
658
OPEN
CHANNEL FLOW METER NON CONTACT ULTRASONIC
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Model 658 Detailed Datasheet 
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Features
- Dual Microprocessors
Provide High Reliability And Improved Performance.
- Built-in Keypad For Easy
Field Calibration.
- Sixteen Character Alphanumeric
Display.
- Eight Digit Non-Reset
Totalizer.
- Sampler Pacer And Alarm
Relays.
- Integral RS-232 or RS-485
Communications Port.
- Stored Equations For
Most Flumes And Weirs; Also Custom Curves.
- Overrange Feature-Totalization
Continues At Flow Rates Greater Than Calibrated Maximum Rate (up to any preset
limit).
- Zero Offset Feature To
Correct For Actual Sender/Receiver Elevation Position.
- Memory Is Protected For
Over 5 Years Following Loss Of Supply Power.
- Programmable Access Lockout
Function.
- Self-Diagnostic Tests
And Protection.
- Submersible Sender/Receivers.
- Narrow Beam Angles To
Accommodate Flumes Down To 1" Size (25 mm).
Operating Principle
The Delta
Controls Model 658 measures head or level in the flume or weir by transmitting
sound pulses to the surface of the water. The sound pulses are reflected from
the water and return to the sender/receiver as echoes. The time taken by the
pulses to travel both directions is measured and divided by two to yield distance
traveled. Distance measured is subtracted from the zero value of the flume or
weir, is proportional to flow rate and thus is used in a stored equation to
calculate flow rate.
Signals
and Outputs
A 9-digit LCD display showing
flow rate or accumulated flow quantity (resetable) is included. An isolated
4-20 mADC analog signal proportional to flow rate and an RS-232 communications
port is standard. Four 10 amp SPDT relay contacts are provided and can be used
for alarm and/ or control functions. Relays can be programmed to drive a remote
electromechanical totalizer, a loss-of-echo alarm, a high flow rate alarm, a
flood alarm, and other functions. An optional 8-digit electro-mechanical totalizer
that accumulates flow in gallons or other engineering units is available.
Specifications
- General Type:
Microprocessor based.
- Power Requirements:
120 or 240VAC; 24VDC
- Ambient Temperature
Range: -20° to 160°F (-30 to 75°C) without heater.
- Analog Output:
Isolated 4-20 mADC, up to 1,000 loop ohms. Better than 0.001 (12 bit) resolution.
- Digital Input/Output:
RS-232 or RS-485 to a host computer or telemeter.
- Alarms: High flow
rate, low flow rate, overrange and lost echo; 10 amps ratings.
- Calibration Entry:
Board mounted keypad, 20 keys.
- Calibration Parameters:
Zero, flume or weir type, flume size, maximum flow rate (or custom 20 point
head to flow curve), blanking, dampening, flow engineering units to be displayed,
sampler frequency rate, alarm set points, RS-232 baud rate, fail-safe action
for outputs, and a lockout code to prevent tampering by unauthorized persons.
- Indication: Board
mounted 16 character, alphanumeric LCD display; user selectable to read flow
rate, head, accumulated flow, temperature, calibration parameters and diagnostic
data. Accumulated flow can be reset for various time studies. LCD illuminated
display is optional.
- Memory Protection:
Nonvolatile, maintains stored data for more than 5 years following loss of
supply power. No battery to replace.
- Self-Diagnostics:
Continuous self-checking; various actions programmable for various modes of
detected failure.
- Temperature Compensation:
Automatic using a high accuracy 2-wire single chip temperature transmitter;
reads in °F or °C.
- Accuracy: 0.5%
of sender/receiver range.
- Repeatability:
0.10% of sender/receiver range.
- Wiring Connections:
Clamp type up to 12 gage (2mm).
- Alarm/control Relays:
Four; SPDT, 10 amp at 240 VAC dry contacts
- S/R Sensor: Seal
welded and potted; submergible, -40 to +150°F (-40 to 70°C); 25 feet (8 M)
cable; 2 wire integral temperature transmitter; ¾" NPT stem mounting
Left to right above: Narrow Beam,
General Purpose, and Explosion Proof Delta Controls Sender/Receiver
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Controls Home Page
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