Liquid Controls IT300N-BBL - Manual (Page 10)

9
OPERATION
A suitable pulse producing device or flow meter is wired to one of the three pulse inputs provided on the IT 300N.
Only one of these inputs is used in a given application. There are no connections to the two unused pulse inputs.
Isolated magnetic pickups may be connected to terminals 1 and 2. Isolated contact closures may be connected to
terminals 5 and 6. Any pulse type may be connected to terminals 9(-) and 10(+).
Power to the unit may be provided by internal batteries, external DC, or the current loop. In all cases, the internal
battery will provide for continued operation in the event primary power is lost.
Once properly wired, the operation of the IT 300N is automatic.
The flow totalizer is updated every 2 seconds* with the latest total. If no input counts are received the unit remains
in a low power state to conserve power.
The flow total may be cleared by the front panel switch sequence or by a contact closure on the remote reset
terminal to circuit common.
To reset the unit from the front panel, the following key sequence is required:
Press M “CLr tot” will be displayed (if the panel lock is on, the display will prompt "
ent code
".
Enter the proper code to advance to the clr tot prompt)
Press E To clear the total. Unit will return to operation
The flow rate indicator will measure the flow rate once every 2 seconds* and display the flow rate.
If the input pulses are not detected within the delay setting (0.2 seconds), a flow rate of 0 will be indicated.
The analog output will be scaled based on the user selected zero and full scale and the measured flow rate. The
analog output is updated every 2 seconds*.
The pulse output will generate a burst of pulses every 2 seconds* in accordance with the instrument setup of pulse
scaling.
MAINTENANCE:
The only scheduled maintenance for the IT 300N is periodic replacement of the battery.
Battery Replacement:
The IT 300N has a battery monitor feature which illuminates when the lithium battery voltage approaches its end
of life. A descriptor, “BAT”, illuminates when the battery voltage falls below this predetermined value. The low
battery detector operates correctly with all power options.
The battery, or batteries, should be replaced within several weeks of the first occurrence of low battery warning,
“BAT”. Left unattended, the unit may become inaccurate, cease to operate or loose setup information or
malfunction.
Batteries should be replaced one at a time to avoid interrupting the power.
See INSTALLATION section for battery installation instructions.