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LEVELtrol-II Installation & Operating Instructions
5.2 General Operation
The unit can display: Level, Available Total, Gross Total, Temperature,
Density, Presets and Time of Day. The Temperature and/or Density
can be displayed even if you are using the Volumetric Flow Equation (a
Temperature or Density sensor must be installed). The unit can perform
Volume, Mass or Corrected Volume equations using a temperature
or density sensor (these equations can be computed without Temp/
Dens sensors by using user defined default values). The unit can be
programmed to perform Level or Batching functions (see section 6.3,
SELECT INSTRUMENT Submenu).
5.3 Level/Total Operation
The Level/Total mode is used primarily to monitor and control level and tank
volume. The relays can be used to trigger level, tank volume, temperature
or density alarms. Analog, pulse and communication outputs are also
provided.
5.3.1 Password Protection for Level/Total mode
After an Operator and/or Supervisor Password is defined in the setup mode
(see section 6.3, SETUP PASSWORD submenu), the unit will be locked.
The unit will prompt the user for the password when trying to perform the
following functions:
Enter Menu
Edit Preset 1 (PRE 1 Key) (if operator access is set to "none")
Edit Preset 2 (PRE 2 Key) (if operator access is set to "none")
The Supervisor password should be reserved for supervisors. The
Supervisor password will allow access to restricted areas of the Setup
and Test menus.
A control input can also be configured as a jumper hardware lockout.
5.3.2 Relay Operation in Level/Total mode
Two or four relays are available for control and/or alarm output functions.
The relays can be assigned to trip according to level, total, temperature or
density readings. The relays can be programmed for low or high alarms.
Preset 1 (RLY1) and Preset 2 (RLY2) are easily accessible by pressing
the PRE 1 or PRE 2 key on the front panel. Preset 3 and Preset 4 are
accessible only through the setup menu.
NOTE: Choose relay operations that will fail safe for your process. Also
use suitable safety interlocks (level switches) to prevent overfilling
containers.
5.3.3 Pulse Output in Level/Total mode
The isolated pulse output (open collector) is menu is assigned to follow
changes in the Volume Total, Corrected Volume Total or Mass Total. The
pulse output duration can be set for 10mS (100Hz max) or 100mS (10Hz
max). A pulse output scale factor (pulse value) can be set to scale the
pulse output. The pulse output is ideal for connecting to remote totalizers or
other devices such as a PLC. See section 1.3 for electrical specifications.
Pulse outputs can be used to indicate approximate delivery totals received
or delivered.
General
Operation
Level/Total
Operation
Password Protection
(Level/Total mode)
Relay Operation
(Level/Total mode)
Pulse Output
(Level/Total mode)