OPEN CHANNEL FLOW TRANSMITTERMODEL 872FM 2-WIRE 4-20mA WITH INTEGRAL DISPLAY

MODEL 671FM 2-WIRE 4-20mA WITH REMOTE CALIBRATIONFIELD PROVEN ULTRASONIC MEASURING TECHNIQUES

The Models 872FM AND 671FM are ultrasonic levelsensing devices used to transmit the flow rate of a liquid inan open channel.

The unit is positioned over the surface of the liquidupstream from a measuring weir or flume. A series of highfrequency sound waves are generated during the "send"portion of the cycle. The sound waves travel through theair space between the face of the Sender/Receiver (S/R)unit and the liquid surface. The sound waves strike theliquid surface, are reflected, travel back to the S/R unit,and are detected during the "receive" portion of the cycle.The time elapsing between "send" and "receive" ismeasured and corrected for speed of sound variations dueto temperature, and is used by the instrument to calculatethe crest level. The unit produces a 4-20mA signal that islinearly proportional to flow rate.

DELTA CONTROLS Corporation

TS 872FM

FEATURES

• Versatile � Measures Water, Sewage, and Slurries• Submergible to 100 Feet (30M); Gas-tight• Improved Personnel Safety for Hazardous Places such as

Sewers, Pump Pits, Covered Lagoons, Etc.• Remote Configuration and Calibration• Suitable for Most Flumes, and Weirs; also Custom

Linearization to User Supplied Tables.• Intrinsically Safe Classification Improves Safety and

Lowers Cost of Installation and Operation

APPLICATION

BASIC SPECIFICATIONS

Measurement Range: 1 to 8 feet (30 to 250 cm)Beam Angle: ±6° at the 3 dB down boundaryOutput: 4-20 mA analog, also RS485 on remoted unitBuilt-in Temperature Compensation: YesAccuracy: Better than 0.25% of maximum rangeSupply Voltage: 11-30 VDCAmbient Temperature: -40 to +140°F (-40 to +60°C)Housing: 4X Hoseproof and 6 SubmergibleWiring: Robust cable with a tough rubber jacket;

10 ft (3 M) basic, longer lengths optional.Calibration: Integral keypad (Model 872FM)

remote via RS485 (Model 671FM)Mounting Connection: NPT, Flange, or StemMaterials: PVC and 300 S.S.Typical Flow Elements:

Parshall and Palmer-Bowlus flumesRectangular, V-Notch and Cipolletti Weirs

OPTIONAL:Intrinsically Safe: CSA (CANADA), NRTL/C (USA)

Class 1, Division 1 & 2, Groups ABCDLinearization: To fit non-standard elementsReduced Head Room: To 4� (100mm)Ranges: Up to 50 feet (15M)

Model 872FM Integral Display2� NPT Mounting

Model 671FM StemMount, and Extended

S/R Unit

Wall BracketMounting

S/R Unit

DELTA CONTROLS CORPEngineered Sensors � For Difficult Services

585 Fortson StreetShreveport, La. 71107 - USA

MODEL NUMBERING SYSTEM

Voice: 318-424-8471Fax: 318-425-2421E-mail: delta@deltacnt.comWeb Site: http://www.deltacnt.com

00-87232A The most recent version of this document is available at http://www.deltacnt.com/00-87232.pdf

BASICTYPE - TRANSMITTER

MOUNTING - CABLELENGTH - OPTIONS

MODEL NO.: 872FM - 2NP - 10� - AA

M/N DESCRIPTIONAA NoneIS Intrinsically Safe (872FM only)

*ACF Frame For Across The Channel Instrument Mounting*PED Pedestal Over Channel Mount*WMB Mounting Bracket for Wall Or Ledge

*EL Extended Sensor InsertionCC 3/4" NPT Conduit Connection HubJB Gasketed Junction Box With T/S And RJ-11 Receptacle,

2 Each 1/2� Hubs, Use With Model 824 HandheldCET Linearization Curve For Other Primary ElementsZZ Other Requirements

* Used with �SC� Stem Mounting

M/N DESCRIPTION872FM INTEGRAL KEYPAD

671FM REMOTECOMMUNICATION

M/N DESCRIPTIONSC Stem Mounting

2NP 2� NPT Pipe Thread2FV 2� 150# FF PVC FlangeZZ Other sizes and types

Handheld CalibratorField Panel MountedRate and Calibrator

REMOTE CONFIGURATION INTERFACE

The Model 671FM is a 2-wire, 4-20mA, loop poweredinstrument. It also has an additional wire pair, whichconnects to a remoted calibrator such as a Model 824handheld calibrator, a Model 825 panel mountdisplay/calibrator, or a PC running under windows. Theremote unit communicates by RS-485 and can be locatedup to 4000 feet (1.25 KM) away from the transmitter. Asingle remoted calibrator unit can handle from 1 to 30transmitters. All information, including flow rate, isavailable at the calibrator without using the 4-20mA signal.

INTEGRAL KEYPAD/DISPLAY

The Model 872FM has a built-in display and keypad.Its one-piece simplicity makes it the best choice formany applications.

OVER THE CHANNEL SUPPORT FRAME

Note: Remote RS-485 Communicationmay be operated by a handheld calibrator,a panel mount display/calibrator, a flowtotalizer, or a PC (C/F for software), up to30 transmitters per loop.

FEET

RS-485RS-485

RS-485

Software Package FlowRate And Calibrator

Field Mounted Rate,Totalizer, and Calibrator

4-20 mA

RS-485