5.2 Transmitter bottom reference (P010)
Fast Keys 2,2,1,2
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 4 mA and
20 mA output (on the Rosemount 3101 only)).
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 HART and
4–20 mA output (Rosemount 3102 and 3105 only)).
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.
5.2.1 Use the integral buttons to use or change the bottom reference
(b.rEF) setting
Procedure
1. From the PV display, press the green button ↓ to indicate b.rEF.
2. Press the blue button → to indicate the present b.rEF value.
• If this value is correct, press the red button ↵ and then the green
button ↓ to get to the next menu.
• If the value is not correct, continue with step 3.
3. Press the blue button → to start editing. The first digit flashes.
4. Use the green button ↓ to edit the flashing digit.
5. Press the blue button → to move to the next digit. The digit flashes.
6. Repeat steps 5 and 6 until the last digit is flashing and edited as
required.
7. Press the blue button → to confirm the new b.rEF value. No digits
flashing.
8. Press the red button ↵ to save the new value, or press the blue
button → to not save. Afterwards, depending on the action taken,
either the b.rEF menu or the next menu appears.
August 2019 Quick Start Guide
Quick Start Guide 25
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