User's Manual

MTU Installation Requirements 3
SERIES 4000 OPERATION
The Series 4000 MTU is designed to connect with a Honeywell ERX pressure
monitor, a Honeywell Mini-AT volume corrector, or a Mini-Max volume
corrector. In addition to a 10 item audit trail, the Series 4000 allows the user to
perform on-demand reads and reconfigure the instrument and the MTU via the
NCC. It contains a replaceable battery, two LEDs, and a USB port used for
commissioning and reading information from the MTU locally.
The Series 4000 MTU is mounted to a wall or a pipe near the volume corrector or
pressure monitor. The MTU connects to the instrument via cable and
communicates with the DCU using FCC licensed frequencies.
Configuration
The Series 4000 MTU allows the user to change instrument configuration settings
from the NCC. The MTU checks the instrument configuration daily, and returns
the changed parameter and the new value to the NCC in a daily Change Report.
The NCC will then compare the Change Report data to the initial configuration
value transmitted to the NCC immediately after installation. In addition to these
Change Reports, the user can also configure the MTU to send a full Configuration
Report to the NCC every 30, 60, 90, or 180 days.
For added security, if there is an attempt to change the configuration settings
through the MTU USB port, the MTU will notify the NCC within 25 hours.
Read Intervals
The rate at which the MTU reads data from the instrument is configurable to
support instrument log intervals of 15 minutes or more. At the end of each interval,
the MTU will read the instrument. The data will then be transmitted back to the
NCC at an interval that is equal to the instrument log interval.
Time Synchronization
Time keeping is crucial for accurate reporting. The Series 4000 MTU and the NCC
software are designed to ensure that the internal clocks of the instrument, MTU,
and NCC all remain synchronized. In addition to synchronizing the time at initial
installation, the MTU checks the instrument clock daily. If the clock is off by more
than 10 seconds, it will automatically synchronize the instrument clock.
The MTU will send a flag to the NCC along with the amount of adjustment made
to the instrument clock for any readings that are off by more than two minutes.
When the NCC receives readings that are flagged with incorrect time, it will
automatically correct the time stamps according to the difference reported by the
MTU.
DRAFT