KEP ES-749 Specifications

ES-749

• “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

• 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*

Utility Metering Flow Computer

• DDE Server & HMI Software Available

• Windows™ Setup Software

• NX19 Gas Equations, Stacked DP Transmitters

Description:

The ES-749 Flow Computer satisfies the instrument

requirements for a variety of owmeter types in liquid, gas, steam
and heat applications. Multiple ow equations are available in a

single instrument with many advanced features.

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 conguring the instrument.

Applications Include:

Steam Mass, Steam Heat, Natural Gas, Fuel 0il, Compressed

Air, Chilled Water Only, Heated Water Only including Low

DeltaT Cutout.

The isolated analog output can be chosen to follow the volume

ow, corrected volume ow, mass ow, heat ow, 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 remote meter reading.

A Service or Test mode is provided to assist the user during
start-up system check out by monitoring inputs and exercising
outputs. The system setup can also be printed.

* LonWorks protocol requires a different module assembly from the

other available protocols. LonWorks is not eld selectable.

•

Remote Metering by External Wireless or Modem

• Attractive Wall Mount Enclosure Available

Specications:
Environmental

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

Display

Type: 2 lines of 20 characters
Types: Backlit LCD, OLED and VFD ordering options
Character Size: 0.2” nominal
User selectable label descriptors and units of measure

Keypad

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

Enclosure

Enclosure Options: Panel, Wall, Explosion Proof
Size: See Dimensions
Depth behind panel: 6.5” including mating connector
Type: DIN
Materials: Plastic, UL94V-0, Flame retardant

Bezel: Textured per matt nish

Power Input

The factory equipped power option is internally fused. An

internal line to line lter capacitor is 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 Cosumption
AC Power: 6.5 V/A
DC Power: 300 mA max.

990239 08/14/17

Flow Meter Types:

Linear: Vortex, Turbine, Positive Displacement, Magnetic,

GilFlo, ILVA, Mass Flow and others

Square Law: Orice, Venturi, Nozzle, V-Cone, Wedge,

Averaging Pitot, Target, Verabar, Accelabar
and others

Multi-Point Linearization: May be used with all owmeter

types. Including: 16 point, UVC and dynamic
compensation.

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 Over voltage

protection

Over-Current Protection: Internally current limited

protected to 24VDC

Pulse Inputs:

Number of Flow Inputs: one

Input Impedance: 10 k Ω 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)
Selectable sensitivity: 10 mV and 100 mV
Minimum Count Speed: 0.25 Hz (to maintain rate
display)
Maximum Count Speed: Selectable: 0 to 50 kHz
Overvoltage Protection: 50 VDC

Temperature, Pressure, Density Inputs

The compensation inputs usage are menu selectable
for temperature, temperature 2, pressure, density or
not used.

Calibration: Operator assisted learn mode
Operation: Ratiometric
Accuracy: 0.02% FS at 20° C
Basic Measurement Resolution: 16 bit
Update Rate: 2 updates/sec minimum
Automatic Fault detection:
Signal Over-range/under-range
Current Loop Broken
RTD short
RTD open
Reverse Polarity: No ill effects
Over-Current Limit
(current input)Internally limited to protect input to

24 VDC)
Available Input Ranges
Current: 4-20 mA, 0-20 mA
Resistance: 100 Ohms DIN RTD

100 Ohm DIN RTD (DIN 43-760, BS 1904):
Three Wire Lead Compensation
Internal RTD linearization learns ice point
resistance
1 mA Excitation current with reverse polarity
protection
Temperature Resolution: 0.1° C
Temperature Accuracy: ± 0.5° C

Stored Information (ROM)

Steam Tables (saturated & superheated),
Fluid Properties: Water, Air, Natural Gas or Generic

User Entered Stored Information (EEPROM / Nonvolatile
RAM)

Transmitter Ranges, Signal Types
Fluid Properties

(specic gravity, expansion factor, specic heat,

viscosity, isentropic exponent, combustion heating
value, Z factor)
Units Selections (English/Metric)
Language Translations (optional)

Kessler-Ellis Products • 10 Industrial Way East • Eatontown, NJ 07724 • 800-631-2165 or 732-935-1320 • www.kep.com Kessler-Ellis Products • 10 Industrial Way East • Eatontown, NJ 07724 • 800-631-2165 or 732-935-1320 • www.kep.com

Excitation Voltage

13

PULSE OUTPUT (+)
PULSE OUTPUT (-)

ANALOG OUTPUT COMMON (-)

ANALOG OUTPUT 2 (+)

RLY1

RLY2

AC LINE
AC LINE24

18 COM
19
20
21
22

23

NC
NC
COM
NO

14
15
16

17 NO

POWER IN

DC (-)

DC (+)

PULSE IN

DC OUTPUT

COMMON
RTD EXCIT (+)
RTD SENS (+)

RTD SENS (-)

8
9
10
11
12

2
3
4
5
6
7

1

TEMPERATURE

Iin (+)

Vin (+)
Iin (+)

IN

IN

FLOW

RTD EXCIT (+)
RTD SENS (+)
RTD SENS (-)

DC OUTPUT

PRESSURE

(TEMP 2)

Iin (+)

IN

ANALOG OUTPUT 1 (+)

- - - - - - - - - -

24 VDC @ 100 mA (fault protected)

Relay Outputs

The relay outputs usage is menu assignable to
(Individually for each relay) Hi/Lo Rate Alarm, Hi/Lo
Temperature Alarm, Hi/Lo Pressure Alarm, Pulse Output
(pulse options), Wet Steam or General purpose warning
(security).

Number of relays: 2 (3 optional)
Contact Style: Form C contacts
Contact Ratings: 240 V, 5 amp

Analog Outputs

The analog outputs are menu assignable to correspond
to the Uncompensated Volume Rate, Corrected Volume
Rate, Mass Rate, Heat Rate, Temperature, Density, or
Pressure.

Number of Outputs: 2
Type: Isolated Current Sourcing (shared common)
Available Ranges: 0-20 mA, 4-20 mA (menu
selectable)
Resolution: 16 bit
Accuracy: 0.05% FS at 20 Degrees C
Update Rate: 5 updates/sec
Temperature Drift: Less than 200 ppm/C
Maximum Load: 1000 ohms
Compliance Effect: Less than .05% Span
60 Hz rejection: 40 dB minimum
EMI: No effect at 3 V/M
Calibration: Operator assisted Learn Mode
Averaging: User entry of DSP Averaging constant to
cause a smooth control action

Listing: CE Approved, UL/CSA Pending

Data Logging

The data logger captures print list information to internal
storage for approximately 5000 transactions. This
information can be used for later uploading or printing.
Storage format is selectable for Comma-Carriage Return
or Printer formats.

Isolated Pulse output

The isolated pulse output is menu assignable to
Uncompensated Volume Total, Compensated Volume
Total, Heat Total or Mass Total.

Pulse Output Form (menu selectable): Open Collector
NPN or
24 VDC voltage pulse
Nominal On Voltage: 24 VDC
Maximum Sink Current: 25 mA
Maximum Source Current: 25 mA
Maximum Off Voltage: 30 VDC
Saturation Voltage: 0.4 VDC
Pulse Duration: User selectable
Pulse output buffer: 8 bit
Fault Protection
Reverse polarity:
Shunt Diodes
Over-current Protected
Over-voltage Protected

Real Time Clock

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

Terminal Designations

Serial Communication

The serial port can be used for printing, datalogging,
modem connection and communication with a computer.
Power is provided for KEP’s MPP2400N (modem)
communication accessory.
RS-232:
Device ID: 01-99
Baud Rates: 300, 1200, 2400, 9600
Parity: None, Odd, Even
Handshaking: None, Software, Hardware

Print Setup: Congurable print list and formatting,

RS-485:
Device ID: 01-247
Baud Rates: 300, 600, 1200, 2400, 4800, 9600,
19200
Parity: None, Odd, Even
Protocol: Modbus RTU (Half Duplex)

Compatible with external dataloggers.