KEP ES749 - General Operation; Password Protection; Relay Operation; Pulse Output

ES749 Flow Computer
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5.2 General Operation
This instrument is used primarily to monitor owrate and accumulated total. The inputs
can be software congured for a variety of owmeter, temperature and pressure sensors.
The standard output types include: Pulse, Relay, Analog and RS-232 The unit can display
the owrate, total and process variables. RS-485 is an available option for a second
communication channel.
5.3 Password Protection
After an Private and/or Service Code is entered in the "System Parameters" Submenu
Group. (see section 6.3, Private Code and Service Code sub-menus), the unit will be
locked. The unit will prompt the user for the password when trying to perform the following
functions:
Clear Totals
Clear Grand Totals (service code required)
Edit a Setup Menu Item
Edit Alarm Setpoints (ALARM 1 & ALARM 2 Keys)
The Service Code should be reserved for service technicians. The Service Code will
allow access to restricted areas of the Service and Test menus. Changes in these areas
may result in lost calibration information.
5.4 Relay Operation
Two relay alarm outputs are standard. The relays may also be used for pulse outputs.
The relays can be assigned to trip according to various rate, total, temperature or pressure
readings. The relays can be programmed for low/high alarms, latch or unlatch, or as
relay pulse outputs.
ALARM SETPOINT 1 (RLY1) and ALARM SETPOINT 2 (RLY2) are easily accessible by
pressing the ALARM 1 or ALARM 2 key on the front panel.
5.5 Pulse Output
The isolated pulse output is menu assignable to any of the available totals. The pulse
output duration and scaling can be set by the user. The pulse output is ideal for connecting
to remote totalizers or other devices such as a PLC. See section 1.2 for electrical
specications.
5.6 Analog Outputs
The analog outputs are menu assignable to correspond to any of the process parameters.
The outputs are menu selectable for 0-20 mA or 4-20 mA. The analog outputs are ideal
for "trend" tracking using strip chart recorders or other devices.
5.7 Function Keys; Display Grouping
TOTAL Press the keys to view HEAT TOTAL, MASS TOTAL, CORRECTED
VOLUME TOTAL, VOLUME TOTAL
GRAND TOTAL Press the keys to view GRAND HEAT, GRAND MASS, GRAND
CORRECTED VOLUME, GRAND VOLUME
RATE Press the keys to view HEAT, MASS , CORRECTED VOLUME,
VOLUME, PEAK DEMAND, DEMAND LAST HOUR
TEMPERATURE Press the keys to view TEMPERATURE 1, TEMPERATURE 2, DELTA
TEMPERATURE, DENSITY
PRESSURE Press the keys to view PRESSURE, DIFFERENTIAL PRESSURE, , Y
1
,
SPECIFIC ENTHALPY
TIME Press the keys to view TIME/DATE, PEAK TIME/DATE, ACCUMULATIVE
POWER LOSS TIME, TIME OF LAST POWER OUTAGE, TIME POWER WAS
LAST RESTORED
General
Operation
Password Protection
Relay Operation
Pulse Output
Analog Outputs
Function Keys
Display Grouping