KEP meter ES-747 Flow Computer for Liquid and Gas Applications

KEP meter ES-747 Flow Computer for Liquid and Gas Applications

Table of Contents

The ES-747 Flow Computer satisfies the instrument requirements for pulse-producing flowmeters in liquid and gas applications. Multiple flow equations and instrument functions are available in a single unit with many advanced features. The alphanumeric display shows measured and calculated parameters in easy to understand format. Single-key direct access to measurements and display scrolling is supported.

The versatility of the ES-747 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.

The isolated analog output can be chosen to follow volume flow, corrected volume flow, mass 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 data recording, transaction printing, or for connection to a computer. Front panel selection of fluid type is supported. Linearization options include UVC, Strouhal/Roshko, and 40-point linearization tables. A Service or Test mode is provided to assist the user during startup system checkout by monitoring inputs and exercising outputs
and printing system setup.


  • Supports Pulse Producing Flowmeters
  • Rate/Total and Batching Functions
  • Universal Viscosity Curve (UVC) and Strouhal/Roshko Advanced Linearization Methods
  • Gas & Liquid Flow Equations (Volume, Mass, Corrected Volume)
  • API 2540, AGA-7 Equations
  • 10 Selectable Fluid Tables
  • Advanced Batching Features: Overrun Compensation, Print End of Batch
  • Menu Selectable Hardware & Software Features
  • Data Logging
  • Two-Line LCD, OLED, or VFD Display
  • Isolated Pulse and Analog Outputs Standard
  • RS-232 Port Standard, RS-485 Optional
  • Windows™ Setup Software
  • DDE Server & HMI Software Available


Flow Meters and Computations

  • Meter Types: Supports pulse-producing meters including vortex, single rotor turbine, magnetic, PD flowmeter
  • Linearization: 40-point table, UVC table, or Strouhal/Roshko
  • Computations: Volume, Corrected Volume & Mass
    Fluid Computations: Density, Viscosity


  • Operating Temperature: 0°C to +50°C
  • Storage Temperature: -40°C to +85 C
  • Humidity: 0-95% Non-condensing main supply voltage
  • Materials: U.L. approved


CE Compliant, UL/CUL Listed


  • Type: 2 lines of 20 characters
  • Types: Backlit LCD or OLED or VFD
  • 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


  • Size: See Dimensions on 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 MS-747 is equipped with a battery-backed real-time clock with a display of time and date.

12 or 24-hour time display
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.

110 VAC Power: 85 to 127 Vrms, 50/60 Hz
220 VAC Power: 170 to 276 Vrms, 50/60 Hz
DC Power:

12 VDC (10 to 14 VDC)
24 VDC (14 to 28 VDC)

  • Power Consumption:

AC: 11.0 VA (11W)
DC: 300 mA max.

Pulse Inputs:

  • Number of Flow Inputs: one with or without quadrature Input Impedance: 10 KΩ nominal
  • Pullup Resistance: 10 KΩ to 5 VDC (menu selectable)
  • Pull Down Resistance: 10 KΩ to common
  • Trigger Level: (menu selectable)
  • High-Level Input

Logic On: 3 to 30 VDC
Logic Off: 0 to 1 VDC

Low-Level Input (mag pickup)

Sensitivity: 10 mV or 100 mV

  • Minimum Count Speed: Menu selectable
  • Maximum Count Speed: Menu Selectable: 40Hz, 3000Hz, or 20 kHz
  • Overvoltage Protection: 50 VDC

Control Inputs:

  • Switch Inputs are menu selectable for Start, Stop, Reset,
  • Lock, Inhibit, Alarm Acknowledge, Print, or Not Used.
  • Control Input Specifications
  • Number of Control Inputs: 3
  • Input Scan Rate: 10 scans per second
  • Logic 1: 4 – 30 VDC
  • Logic 0: 0 – 0.8 VDC
  • Input Impedance: 100 KΩ
  • Control Activation: Positive Edge or Pos. Level based on product
    definition for switch usage.

Auxiliary / Compensation Inputs:

The auxiliary/compensation inputs are menu selectable
for temperature, pressure, density, or not used. These
inputs are used for the compensated input when
performing compensated flow calculations. It can also
be used as a general-purpose input for display and

  • Number of inputs: 2
  • Operation: Ratiometric
  • Accuracy: 0.02% FS at 20° C
  • Basic Measurement Resolution: 16 bit
  • Update Rate: 1 update/sec minimum
  • Automatic Fault detection: Signal Over-range/under-range
    Current Loop Broken
    RTD short
    RTD open
    Fault mode to user-defined default settings
  • Fault Protection:
  • Reverse Polarity: No ill effects
  • Over-Voltage Limit (Voltage Input): 50 VDC

Available Input Ranges

  • Voltage:0-10 VDC, 0-5 VDC, 1-5 VDC
  • Current: 4-20 mA, 0-20 mA
  • Resistance: 100 Ohms DIN RTD
    Proprietary Thermistor

100 Ohm DIN RTD (liquid equations only)
(DIN 43-760, BS 1904):
Three Wire Lead Compensation
Internal RTD linearization learns ice point resistance
1 mA Excitation current with reverse polarity

  • Temperature Resolution: 0.1°C

More Info Check Data Sheet: KEP meter es747


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