Installation 19
HIT-4U HP-327
The HIT-4U outputs a 4-20mA analog signal that is proportional to the
calculated flow rate. The 4mA and 20mA settings referred to as OUT
LO and OUT HI respectively, may be configured from the front panel of
the instrument or via Modbus communications.
3.2 Analog Output Update Time
The displayed Rate and Total are updated once per second. The analog
output update time is 1/8 seconds. It takes about .25sec. to reach steady
state due to a change in the input.
When flow stops the time for the display to reach 0 and for the analog
output to return to 4 mA is between 0.25 and 8 seconds, depending on
the Sample Time setting (SMPL T). With the default setting the time is
0.25 seconds.
Changing the SMPL T is only recommended for low flow applications
where the input frequency is below 1 Hz. See Chapter 4 for more
information on Sample Time.
Supply Voltage VS Load
0
200
400
600
800
1000
1200
0 5 10 15 20 25 30
Supp ly Voltage
Load (Ohms)
Operating
Region
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