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December 2014
12
Quick Start Guide
Transmitter bottom reference
This is the transmitter’s Bottom Reference setting. 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 (Figure 10 on page 13).
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, and the 4 mA starting
pointing can be any liquid height above or below this zero level.
Note
This parameter is important for calibrating and configuring the transmitter.
Field Communicator or AMS
To view or change the bottom reference:
1. From the Home screen, select
2: Configure.
2. Select
2: Manual Setup.
3. Select
1: Basic Setup.
4. Select
2: Bottom Reference P010.
5. Input the new bottom reference,
and press “
ENTER” to save it.
6. Press “
SEND” to update the transmitter.
Rosemount 3490 Series Control Unit
To view or change the bottom reference:
1. From the Main Menu screen, select
SETUP.
2. Select the transmitter (e.g. “
Tx1: 3107”).
3. Select
DUTY, and then select Bottom Ref.
4. Follow the on-screen instructions to input
and save the new setting.
Bottom Reference P010
40.000 ft
40.000 ft
ESC
DEL ENTER
HELP
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FN
(Field Communicator screen)
Bottom Ref. P010
40.000ft
Esc=Quit =Edit
(Rosemount 3491 screen)