P.O. BOX 330, BRANDAMORE, PA 19316 (610) 942-3190 Fax: (610) 942-3672

Spec: 360.11.08


These specifications describe a model PDS-360 and PDS-360DX Microprocessor Based, Ultrasonic Open-Channel Flowmeter as manufactured by Control Electronics, Inc.


The PDS-360/360DX Flowmeter shall provide continuous, non-contact measurement of open-channel flow through any standard Primary Flow Device.


a. The PDS-360/360DX Flowmeter shall be a microprocessor controlled unit with front panel, menu based programming and alpha numeric operator interface. It shall provide two (2) isolated, independently adjustable, 4-20mA. analog output signals into 1000 ohm load each. Output #1 shall be proportional to FLOW. Output #2 shall be selectable for FLOW RATE, DEPTH of flow or TEMPERATURE. The 4-20mA outputs shall be programmed for averaging and dampening for steady chart recordings and control.

b. The flowmeter shall contain mathematical conversion equations to relate measured depth of flow to flow rate for Parshall, Leopold-Lagco and Palmer-Bowlus flumes; V-Notch and Rectangular Weirs (with or without end contractions); Linear elements and user defined curves. A 20 point programmable Look-Up Table shall also be provided.

c. Setup and programming shall be accomplished using four (4) clearly marked, pressure sensitive "button" areas on the front panel of the controller. All programmed variables and functions shall be PASS WORD protected.

d. The calibration (scaling) of the Flowmeter shall be accomplished from the front panel and shall accommodate spans of 0-1.00 inch full scale to 0-150.00 inches full scale. The DEAD BAND (Min. Range) shall be adjustable from 12.0 to 36.00 inches (12" typical).

e. The Flowmeter shall have a "Test Output" mode for Analog Output Simulation ( 4-20 mA.), eliminating the requirement to physically simulate flow levels for analog output calibration and testing.

f. The Flowmeter shall have a "Test Relay Outputs" mode for testing all relays.

g. Lost-Signal Logic shall be programmable. In the event Echo return is lost, the Flowmeter will alert the operator, then output a programmed % of flow (0-99%) until the echo signal returns.

h. All programmed and Totalized Data shall be saved in nonvolatile memory to prevent loss upon power failure. The flowmeter shall restart with no operator assistance upon return of power. A 12 volt DC Gell Cell battery may be connected to the flowmeter for continuous operation during a power outage.

i. The analog output signals (4-20mA.) shall be repeatable to ±0.5% of range and calculation accuracy to within ±0.4% of value .

j. The flowmeter shall monitor the temperature at the measuring site using a temperature probe built into the Sensor head or allow for manual entry of temperature for correct temperature compensated calculations. Flowmeter shall use a programmed default temperature in the event of temperature probe failure.

k. Surge protection shall be provided on the 120VAC power line and 4-20mA. output lines to reduce potential damage caused by unexpected voltage transients.

l. Flow Totals shall be displayed in 8 digits, using programmable multiplier factors of x1, x10, x100, x1000. The counter shall not reset or lose data in the event of a power failure or system shut down.


A two line, 20 character per line, Alphanumeric, backlighted LCD display shall provide instantaneous flow rate indications in INCHES, GALLONS PER MINUTE, MILLIONS OF GALLONS PER DAY, PERCENT of flow as well as Totalized Flow , Sensor Temperature and Time Stamped Data Logging history of flow totals, min/max/avg and all programmed variables (Metric equivalents are provided).  

2.3 DATA LOGGING (Not available on the PDS-360DX unit)

The flowmeter shall have built-in, Time Stamped Data Logging capabilities, with a programmable logging rate from 0 to 99 minutes of average GPM flow. In addition, a 24 hour Flow Summary with 200 independent counters shall keep the total flow and Average GPM flow rate for each day of the past 6+ months and also time-stamp the daily Minimal and Maximum GPM flow rates. The 24 hour Flow Summary 'Start Time' shall be programmable. A time stamped EVENT LIST shall log flowmeter events. An RS-232 output terminal and RJ11 modular jack shall be available to download Data Logging to a PC or printer. No special software is required to retreive data. The user may use HYPER-TERMINAL in WINDOWS to down load preformated data. An optional MODEM may be used for remote downloading of all data.

2.4 ALARM OUTPUT (Not available on the PDS-360DX unit)

Four (4) 5 Amp SPDT relay closures shall be provided as Alarm/Process control contact outputs. The relay action shall be programmable with the ability to establish independent ON-OFF settings of each relay for differential control.

2.5 SAMPLER PROGRAMMABLE PULSE OUTPUT (Not available on the PDS-360DX unit)

One (1) Programmable 5 Amp SPDT relay Pulse Output shall be provided for operating a remote sampler, counter or other device. The pulse rate shall be programmable from 0 to 999,999 Gallons. Contact closure shall be 250 milliseconds in duration.


The flowmetering system shall be housed in a fiberglass enclosure rated NEMA 4X, IP65 (water-tight, dust-tight and corrosion resistant) with a clear hinged cover for viewing the display panel. The enclosure shall be suitable for wall mounting and withstand submergence to six feet.


A US70TC 40Khz PVC explosion proof, corrosion resistant, immersible sensor shall be provided. The Sensor shall be considered explosion proof and suitable for Class 1, Div. 1, Groups C & D and Class II, Div. 1, Groups E, F & G environments. The sensor shall be mounted a minimum of 12.0 inches (standard) above the maximum flow level to be monitored and in the event of being submerged, shall resume normal operation when the flow level returns to its normal range. The projected ultrasonic beam shall be no greater then 5° conical and suitable for use in a stilling well. Signal applied to the Sensor Cable shall be 50Volts peak to peak to prevent possible harm to personnel and arcing of cable in the event of a loose connection or cable damage. Sensor cable may be shorted with no damage resulting to equipment. Signals greater than approximately 50 Volts applied to the Sensor Cable shall not be acceptable. The sensor shall be capable of being located up to 1000 feet from the Electronic Processing Unit, requiring no special pre-amps or other circuitry. The sensor shall have 3/4 inch NPT male pipe threads for mounting and a built-in temperature probe. Cable shall be a twisted pair shielded. Multiconductor cables shall not be acceptable.


An optional corrosion resistant, PVC sensor mounting bracket shall be provided to accurately position the sensor over the Primary Flow Device. It shall have adjustable horizontal, vertical and angular capabilities.


The Flowmeter shall be pretested, calibrated and 100% quality control inspected and be warranted against defects in parts and labor for one (1) year from date of shipment.

CONTROL ELECTRONICS, INC. P.O. Box 330, Brandamore, PA 19316

(610) 942-3190 FAX: (610) 942-3672


© 1999-2011, Control Electronics, Inc.