Max Machinery 121 INDICATOR - Manual (Page 16)

Pg 16 121-000-350 © 2001 Max Machinery, Inc.
General Operation
5.2 General Operation
The unit can display: Rate, Total, Grand 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 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 Ratemeter/Totalizer or Batching functions (see section 6.3, SELECT
INSTRUMENT Submenu).
5.3 Ratemeter/Totalizer Operation
The Ratemeter/Totalizer mode is used primarily to monitor flowrate and accumulated total. The relays can be
used to trigger flow, total, temperature or density alarms.
5.3.1 Password Protection for Rate/Total mode
After an Operator and/or Supervisor Password is entered 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:
Clear Total
Clear Grand Total
Enter Menu
Edit Preset 1
Edit Preset 2
The Supervisor password should be reserved for supervisors. The Supervisor password will allow access to
restricted areas of the Setup and Test menus.
5.3.2 Relay Operation in Rate/Total mode
Two relays are available for alarm outputs. The relays can be assigned to trip according to rate, total, temperature,
density readings or general system alarms. The relays can be programmed for low or high alarms. Preset 1(RLY1)
and Preset 2 (RLY2) are easily accessible by pressing the PRESET 1or PRESET 2 key on the front panel.
5.3.3 Pulse Output in Rate/Total mode
The isolated pulse output (open collector) is menu assignable to Volume Total, Corrected Volume Total or Mass
Total. The pulse output duration can be set for 10mS (50 Hz max) or 100mS (5 Hz 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.
5.3.4 Analog Output in Rate/Total mode
The analog output is menu assignable to correspond to the Volume Rate, Corrected Volume Rate, Mass Rate,
Temperature, Density, Volume Total, Corrected Volume Total or Mass Total. The analog output is ideal for "trend"
tracking using strip chart recorders or other devices.
5.3.5 RS-232 Serial Port Operation in Rate/Total mode
The RS-232 serial port can be used for programming (using the Setup Disk) or for communicating to printers and
computers in the Operating Mode (Run Mode).
PC Communications:
The Setup Disk also allows the user to query the unit for operating status such as Flow Rate, Flow Total,
Temperature, Density, Presets, etc.