Operation And Maintenance; Operation - Hoffer Flow Controls HIT-2A User Manual

6. OPERATION AND MAINTENANCE

6-1

Operation

A suitable pulse producing device or flow meter is wired to the HIT-2A
Signal Input terminals 1 (Sig +) and 2 (Sig -). The Signal Input circuit
must be configured for the connected input device using the appropriate
jumper blocks.
Internal batteries, external DC, or a loop current may provide power to
the unit. For all power options other than internal batteries (A), if the
primary power is lost, the internal backup battery will provide for
continued operation of the totalizer.
Once properly wired, the operation of the HIT-2A is automatic.
The flow totalizer is updated every 2 seconds
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 P
Press OK
Press ▲
Press OK
Press ▲
The flow rate indicator measures the flow rate once every 2 seconds
and display the flow rate.
If the input pulses are not detected within the maximum sample time (1
to 80 seconds), a flow rate of zero (0.00) is indicated.
The analog output is scaled based on the user selected zero and full
scale and the measured flow rate.
The pulse output generates a burst of pulses every 2 seconds
accordance with the instrument setup of pulse scaling.
*
A large sample time setting and internal math operations may delay the
update rate.
Operation and Maintenance
is displayed
CLEArtot
To enter edit mode.
To select yes
To clear total
To return to operating mode
*
with the latest total. If
HP-306
23
*
*
in