Maintenance; Error Messages - Hoffer Flow Controls HIT-2A User Manual

6-2

Maintenance

The only scheduled maintenance for the HIT-2A is periodic battery
replacement.
The instrument has a battery monitor feature which illuminates when
the lithium battery voltage approaches its end of life. A descriptor,
"LO 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. Left unattended, the unit may
become inaccurate, cease to operate, lose setup information, or
malfunction.
The batteries should be replaced one at a time to avoid interrupting the
power.
6-3

Error Messages

The HIT-2A is provided with extensive self checking which is used in
reporting malfunctions or unusual operating conditions. When an error
occurs, the display will flash with an error message until the user
presses the OK button acknowledging the error condition. Once an
error condition is acknowledged, the error message will not be
displayed again for 60 seconds if the cause of the error is still present.
If the alarm output is active from an alarm caused by a rate or total
condition, depressing the OK button while the display is showing the
rate and total will reset the alarm output if the condition that caused the
alarm is no longer present. If the alarm output is active because of a
test command, depressing the OK button will not reset the alarm
output.
The following table illustrates the Error Messages, the problem or
cause, and a recommended corrective action:
Operation and Maintenance 24
HP-306