CONTROL ELECTRONICS, INC.

1.0 SCOPE

These specifications describe a model DLC-700LV Microprocessor Based, 4-20 mA. Input Liquid Level Monitor as manufactured by Control Electronics, Inc.

2.0 DESCRIPTION

The DLC-700LV Level Monitor shall provide continuous measurement of liquid level in any standard containment vessel.

2.1 ELECTRONIC PROCESSING UNIT

a. The DLC-700LV Level Controller shall be a microprocessor controlled unit with front panel, menu based programming and alpha numeric operator interface. It shall provide two independent 4-20 mA. analog output signals proportional to level isolated into 1000 ohm load each. Outputs shall be programmed for averaging and analog outputs shall have additional damping (user adjustable) for steady chart recordings and control.

b. The Controller shall contain mathematical conversion equations to relate measured depth in Cylindrical, Horizontal, Spherical, Rectangular and Square vessels to total gallons.

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

d. The calibration (scaling) of the Level Controller shall be accomplished from the front panel and shall accommodate spans of 0-9999.99 inchs full scale with programmable ZERO offset. All settings and readings shall be displayed in 0.01" or 0.01 ft. increments.

e. The Level Controller shall have a "Test Output" mode for Analog Output Simulation, eliminating the requirement to physically simulate liquid levels for analog output calibration and testing.

f. The Controller shall have an internal 24 VDC power supply for Loop-Powered 4-20 mA. Sensors.

g. The Level Controller shall have an auxilary 'memory back-up' for saving the users programmed settings. In the event of a system failure or unseen event, the Controller will automatically reset itself to the users programmed settings.

h. Lost-Signal Logic shall be programmable. In the event the 4-20 mA input signal is lost, the Controller will alert the operator.

i. All programmed Data shall be saved in non-volatile memory to prevent loss upon power failure. The Level Controller shall restart with no operator assistance upon return of power. A 12 volt DC battery may be connected to the Controller for continuous operation during a power outage.

j. The analog output signals shall be repeatable to ±0.4% of range; accuracy shall be ±0.8% of range.

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

2.2 DISPLAY PANEL

A two line, 20 character per line, Alphanumeric, back lighted LCD display shall provide instantaneous Depth indications in INCHES, FEET, PERCENT of level, PSI of water and GALLONS stored,as well as Time Stamped Data Logging history and all programmed variables.

2.3 DATA LOGGING

TheLevel Controller shall have built-in, Time Stamped Data Logging capabilities, with a programmable logging rate from 0 to 99 minutes of average Level. In addition, daily time-staming of Minimal, Maximum, Average Level and Gallons for each day of the month (200 days/6 months) shall be logged for later viewing. An RS-232 output shall be available (opt. USB port) to download the data logg to a PC or serial printer directly or by MODEM for remote monitoring. No special software is required to retreive data. The user may use Microsofts HYPER-TERMINAL in Windows 95/98/2000 to download preformated data.

2.4 ALARM / RELAY OUTPUT

Five (5) 5Amp SPDT relay closures shall be provided as Alarm/Pump control contact outputs. The relay action shall be programmable with the ability to establish independent ON-OFF settings of each relay for differential control. Sequencing of relay outputs, Alternating Lead / Lag or Rotation of pumps functions shall be provided.

2.5 ENCLOSURE

The Level Controller 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.

2.6 SENSOR INPUT

The Level Controller shall accept any standard 4-20 mA. signal proportional to level. Sources may be Pressure Sensors, Ultrasonic Sensors, Bubbler System etc.

2.7 WARRANTY

The Level Controller 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

© 1999-2006, Control Electronics, Inc.