Emerson Rosemount 3101 Quick Start Manual page 16

Quick Start Guide
Method: Field Communicator or AMS
Device Manager
To view or change the Base Units:
1. From the Home screen,
select 3: Service Tools.
2. Select 4: Maintenance.
3. Select 3: Utilities.
4. Select 3: Set Base Units.
5. Select new base units.
Method: Rosemount 3490 Series Control Unit
To view or change the Base Units:
1. From the Main Menu screen,
select SETUP.
2. Select the transmitter
(e.g. "Tx1: 3102").
3. Select SYSTEM, and then select
Base Units.
4. Select new base units.
To get the same base units on the control unit, switch the power off and then on
again. The control unit prompts for the transmitter's Bottom Reference value in
the new base units.
6.5 Transmitter bottom reference
Note
This parameter is important for calibrating and configuring the transmitter.
On the Rosemount 3101, the transmitter's Bottom Reference setting is the
distance measured vertically along the ultrasonic beam path from the
Transmitter Face to the Zero Level of a tank or an open channel (see
page 22).
On the Rosemount 3102 and 3105, it is the distance measured vertically along
the ultrasonic beam path from the User Preferred Sensor Reference Point
(UPSRP) to the Zero Level of a tank or an open channel (see
page 23).
The zero level establishes where the transmitter starts to measure the process
value. It is not necessary to have the 4 mA output start at the zero level. The
4 mA starting point can be any liquid height above or below this zero level.
16
September 2018
Set Base Units (ft)
m
ft ft
in
ABORT
(Field Communicator Screen Shown)
Base Units
metric
Esc=Quit
(Rosemount 3491 Screen Shown)
Figure 13 on
ENTER
=Edit
Figure 12 on