KEP meter ES-759 Seasonal Utility Metering Flow Computer

The ES-759 Flow Computer satisfies the instrument requirements for a variety of flowmeter types in liquid, gas, steam and heat applications. Multiple flow equations are available in a single instrument with many advanced features. The ES-759 offers a special feature that allows users to access Heating Total by pressing the TOTAL button, and Cooling Total by pressing the

GRAND button when using Liquid Delta Heat Equation.

The alphanumeric display offers measured parameters in easy to understand format. Manual access to measurements and display scrolling is supported. The versatility of the Flow Computer permits a wide measure of versatility within the instrument package. The various hardware inputs and outputs can be “soft” assigned to meet a variety of common application needs. The user “soft selects” the usage of each input/output while configuring the instrument.

Applications Include Steam Mass, Steam Heat, Natural Gas, Fuel 0il, CompressedmAir, Combination Chilled Water and Heated Water including Low DeltaT.

The isolated analog output can be chosen to follow the volume flow, corrected volume flow, mass flow, heat flow, temperature, pressure, or density by means of a menu selection. Most hardware features are assignable by this method. The user can assign the standard RS-232 Serial Port for external data logging, transaction printing, or for connection to a modem
for a remote meter reading. A Service or Test mode is provided to assist the user during startup system check out by monitoring inputs and exercising outputs. The system setup can also be printed.


  • “EZ Setup”- Guided Setup for First Time Users
  • Liquid, Gas, Steam and Heat Flow Equations
  • Utility Metering - Steam, Heating/Cooling, Chilled Water, Natural Gas, Compressed Air
  • Press TOTAL button to view Heating Total, Press, GRAND button to view Cooling Total (Liquid Delta Heat Equation)
  • Menu Selectable Hardware & Software Features
  • Internal Data Logger
  • Isolated Pulse and Analog Outputs Standard
  • RS-232 Port Standard, Provides Power for Modem
  • RS-485 with Modbus RTU (optional)
  • Internal Communication Card Option
    Supports: BACnet IP, BACnet MS/TP, Metasys N2, Modbus TCP, AB Ethernet IP, AB DF1, LonWorks*
  • Windows™ Setup Software
  • NX19 Gas Equations, Stacked DP Transmitters
  • DDE Server & HMI Software Available
  • Remote Metering by External Wireless or Modem

  Another Article:


Flow Meters and Computations

  • Meter Types: Vortex, Turbine, Positive Displacement, Magnetic, GilFlo, ILVA, Mass Flow and others
  • Square Law: Orifice, Venturi, Nozzle, V-Cone, Wedge, Averaging Pitot, Target, Verabar, Accelabar, and others
  • Multi-Point Linearization: May be used with all flowmeter types. Including 16 points, UVC and dynamic compensation.


  • Operating Temperature: 0°C to +50°C
  • Storage Temperature: -40°C to +85 C
  • Humidity : 0-95% Non-condensing
  • Materials: UL, CSA, VDE approved


  • Listing: CE Compliant, UL/C-UL Pending


  • Type: 2 lines of 20 characters
  • Types: Backlit LCD or OLED
  • Character Size: 0.2” nominal
  • User-programmable label descriptors and units of measure


  • Keypad Type: Membrane Keypad with 16 keys
  • Keypad Rating: Sealed to NEMA 4X / IP65


  • Enclosure Options: Panel & Wall Mounting Styles
  • Size: See Dimensions at the datasheet
  • Depth behind panel: 6.5” including mating connector
  • Type: DIN
  • Materials: Plastic, UL94V-0, Flame retardant
  • Bezel: Textured per matt finish

Real-Time Clock

  • The Flow Computer is equipped with a battery-backed real-time clock with a display of time and date.
    • Format:
      • 24-hour format for time
      • Day, Month, Year date display

Power Input

  • The factory equipped power option is internally fused. An internal line to line filter capacitor and MOV are provided for added transient suppression.MOV protection for surge transient is also supported
  • Universal AC Power: 85 to 276 Vrms, 50/60 Hz
  • DC Power Option: 24 VDC (16 to 48 VDC)
  • Power Consumption:
    • AC: 6.5 V/A
    • DC: 300 mA max.
    • 24 VDC @ 100 mA (fault protected)

Flow Inputs:

  • Analog Input:
    • Accuracy: 0.02% FS at 20° C
    • Ranges
      • Voltage: 0-10 VDC, 0-5 VDC, 1-5 VDC
      • Current: 4-20 mA, 0-20 mA, 4-20 mA stacked, 0-20 mA stacked
    • Basic Measurement Resolution:16 bit
    • Update Rate: 4 updates/sec
    • Automatic Fault detection: Signal over/under-range, Current Loop Broken
    • Calibration: Operator assisted learn mode
    • Extended calibration: Learns Zero and Full Scale of each range
    • Fault Protection:
      • Fast Transient: 500 V Protection (capacitive clamp)
      • Reverse Polarity: No ill effects
      • Over-Voltage Limit: 50 VDC Overvoltage protection
      • Over-Current Protection: Internally current limited protected to 24VDC

Pulse Inputs:

  • Number of Flow Inputs: one
  • Impedance: 10 KΩ nominal
  • Trigger Level: (menu selectable)
    • High-Level Input
      • Logic On: 2.5 to 30 VDC
      • Logic Off: 0 to 2 VDC
    • Low-Level Input (mag pickup)
      • Sensitivity: 10 mV or 100 mV
  • Minimum Count Speed: 0.25 Hz (to maintain rate display)
  • Maximum Count Speed: Selectable: 0 to 50 kHz
  • Overvoltage Protection: 50 VDC

More Info Check Data Sheet: KEP meter ES759