Emerson Rosemount 3101 User manual

Quick Start Guide
00825-0100-4840, Rev CC
September 2018
Rosemount™3101, 3102, and 3105
Ultrasonic Liquid Level Transmitters

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Quick Start Guide
NOTICE
This installation guide provides basic guidelines for the Rosemount™3101, 3102, and 3105 Ultrasonic Level
Transmitters. It does not provide instructions for detailed configuration, diagnostics, maintenance, service,
troubleshooting, or installations. Refer to the Rosemount 3101, 3102 and 3105 Reference Manual for more
instructions.
Manuals are available electronically on Emerson/Rosemount.com.
Failure to follow these installation guidelines could result in death or serious injury
The Rosemount 3101, Rosemount 3102, and Rosemount 3105 are ultrasonic liquid level transmitters. They
must be installed, connected, commissioned, operated, and maintained by suitably qualified personnel only,
observing any national and local requirements that may apply
Use the equipment only as specified. Failure to do so may impair the protection provided by the equipment
Explosions could result in death or serious injury
Installation of the transmitters in a hazardous environment must be in accordance with the appropriate local,
national, and international standards, codes, and practices. Please review the Product Certifications section
for any restrictions associated with a safe installation
Before connecting a Field Communicator in an explosive atmosphere, ensure the instruments are installed in
accordance with intrinsically safe or non-incendive field wiring practices
Verify that the operating atmosphere of the transmitter is consistent with the appropriate hazardous
locations certifications
External surface may be hot
Care must be taken to avoid possible burns
Process leaks could result in death or serious injury
Install and tighten process connectors before applying pressure
Do not attempt to loosen or remove process connectors while the transmitter is in service
Electrical shock could cause death or serious injury
Make sure that the transmitter is not powered when making connections
If the liquid level switch is installed in a high voltage environment and a fault condition or installation error
occurs, high voltage may be present on leads and terminals

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The Rosemount 3101, 3102, and 3105
The Rosemount 3101, 3102, and 3105 are 4–20 mA loop-powered level
transmitters designed for continuous liquid level measurements in tanks or
open flow channels.
They can be connected directly to a plant control system, or used with a
Rosemount 3490 Series Control Unit for programmable control functionality.
The Rosemount 3105 may be mounted in a hazardous area if powered from a
protected power supply.
1.0 Theory of operation
The transmitter is designed to be mounted above a liquid and uses ultrasonic
pulses to continuously measure the distance to the liquid surface. The
microprocessor-controlled electronics calculates distance to the liquid level
from the time delay between the transmitting and receiving of signals.
When programmed with the bottom reference of the application – usually the
bottom of a tank (Figure 1) – the transmitter calculates the liquid depth (level)
and outputs the level as a 4–20 mA signal (and a digital HART®signal on the
3102 and 3105).
The 3101 measures level only. The 3102 and the 3105 can calculate
distance-to-surface, contents (volume), or open channel flow, and then output
the result as a 4–20 mA signal and a digital HART signal.
An LCD screen inside the enclosure displays the selected measurement.
Programming is achieved using integral buttons inside the enclosure (all
models) or by remote communication using HART (on the 3102 and 3105 only).

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Quick Start Guide
Figure 1. Typical Application
A. Rosemount 3100 Series Transmitter E. Pump
B. Rosemount 3490 Series Control Unit F. Bottom reference
C. 4–20 mA signal G. 4–20 mA and HART signal
D. Relay
HART is available on the Rosemount 3102 and Rosemount 3105.
Considerations before installation
The Rosemount 3100 Series may be used for level and volume measurement in
open or closed tanks, or open channel flow measurement.
The glass-filled nylon housing version of the transmitter must be installed in a
location where it is protected from ultraviolet radiation to prevent long term
degradation of the plastics used e.g. shrouded from direct sunlight.
Note
See also “Product certifications” on page 24 for special conditions for safe use.
2.0 Safety considerations
1. Installation must be carried out by suitably trained personnel in accordance
with the applicable code of practice.
2. If the equipment is likely to come into contact with aggressive substances, it
is the responsibility of the user to take suitable precautions that prevent it
from being adversely affected, thus ensuring that the type of protection is
not compromised.
Aggressive substances are acidic liquids or gases that may attack metals or
solvents that may affect polymeric materials.
B
AG
EE
20mA
4mA
F
DD
C

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Suitable precautions are regular checks as part of routine inspections, or
establishing, from the material's datasheet, that it is resistant to specific
chemicals.
3. The equipment must only be cleaned with a damp cloth; do not use solvents.
4. The equipment is not intended to be repaired by the user and is to be
replaced by an equivalent certified unit. Repairs should only be carried out by
the manufacturer or approved repairer.
5. The transmitter is Double Insulated, and therefore Protective Earthing is not
required. The cable shield/screen should be connected to a suitable ground
(earth) at one end only (see “Connecting the cable(s) to the transmitter” on
page 7).
6. Note that if the equipment is used in a manner not specified by the
manufacturer, the protection afforded by the equipment may be impaired.
7. To ensure electro-magnetic compatibility in any European member state, it
should not be installed in a residential area.
Note
It is not advisable to mount the transmitter near to a source of electrical noise such as a
variable-speed drive or other high-powered electrical device.
3.0 Environmental considerations
1. The Rosemount 3105 transmitter is Intrinsically Safe (IS) approved for
hazardous area installations.
2. The 3101, 3102, and 3105 are designed for open or closed tank installation.
They are weatherproof and protected against the ingress of dust.
3. Avoid installing the transmitters near heat sources.
Figure 2. Environmental Considerations
OKOK OK

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Quick Start Guide
4.0 Mounting considerations
1. Mount the transmitter above the liquid using the 2-in. thread provided, but
no closer than 12 in. (0,3 m) to the surface. The transmitter does not detect
any liquid surface closer than 12 in. (0,3 m) to the transmitter face.
2. The transmitter should be mounted vertically to ensure a good echo from
the liquid surface. The beam half angle is 6 degrees (see Figure 7 on
page 11).
3. Obstructions in the tank, or well, may generate echoes which can be
confused with the real liquid surface echo. Obstructions within the beam
angle generate strong false echoes. Wherever possible, the transmitter
should be positioned to avoid false echoes.
4. To avoid detecting unwanted objects in the tank or well, it is advisable to
maintain a distance sideways of at least 1.3 in. from the center line of the
transmitter for every foot (11 cm per meter) range to the obstruction
(Figure 7 on page 11).
5. No false echoes are generated if the transmitter is located near the side of
the tank or well on condition that the wall is smooth and free of protrusions.
However, there will still be a reduction in the echo size. It is recommended
that the transmitter be mounted no closer than 12 in. (0,3 m) to the wall to
avoid a large reduction in the echo size.
6. If the transmitter is mounted in an enclosed tank with a domed top, avoid
mounting the transmitter in the center of the tank roof because this could
act as a parabolic reflector and create unwanted echoes.
7. Avoid applications where heavy condensation could form on the transmitter
face.
8. If the transmitter is mounted in a stand-off or nozzle, the transmitter face
should protrude at least 0.2 in. (5 mm) into the tank.
9. If the transmitter is used in environments where direct sunlight can cause
high temperatures on exposed surfaces, a sun-shade is recommended.

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Electrical installation
5.0 Connecting the cable(s) to the transmitter
The Rosemount 3100 Series is a two-wire loop-powered transmitter accepting
power supplies as follows:
The 3101: 12 to 30 Vdc
The 3102: 12 to 40 Vdc
The 3105: 12 to 40 Vdc (non-hazardous area), 12 to 30 Vdc (hazardous area)
Note
To comply with the CSA approval requirements, the Rosemount 3101 and
3102 must be powered from a Rosemount 3490 Series Control Unit or a class
2 separate extra-low voltage (SELV) source.
Other devices may reset if connecting the transmitter to a multi-drop system
while the loop is powered. De-energize the loop to avoid devices being reset.
Each transmitter is supplied with two cable entries. A suitable conduit system or
cable gland must be used to maintain the weather-proof rating and hazardous
area protection. Any unused entry must be sealed with a suitably rated blanking
plug.
A two-core, shielded/screened cable is required for external power supply and
output signal connections. The cable is not supplied.
5.1 Hazardous area installation (Rosemount 3105 only)
When the Rosemount 3105 is used with a Rosemount 3490 Series Control Unit,
no additional safety barriers are required. If powering the Rosemount 3105 from
any other source, ensure a suitable Intrinsically Safe (IS) barrier is fitted in the
non-hazardous (safe) area.
The barrier must be chosen such that its output parameters Uo, Io and Po are
less than Ui, Ii and Pi of the transmitter.
IS parameters: Ui = 30 V, li = 120 mA, Pi = 0.82 W, Li = 108 mH, Ci = 0 nF
The sum of the capacitance and the inductance of the transmitter and the
connecting cable must not exceed the maximum specified for the barrier
chosen.
5.2 Connect the cable(s) to the transmitter
1. Make sure that the power supply is disconnected.
2. Undo the three cover screws and then lift the transmitter housing cover.
The cover on the metal housing can rest on the hinge. Place an object under
the cover to avoid the transmitter toppling over.
3. Pass the cable through the cable gland/conduit.

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Quick Start Guide
4. Connect the cable wires:
a. For the 3101, connect wires according to the Figure 3.
b. For the 3102, connect wires according to the Figure 4.
c. For the 3105, connect wires according to the Figure 5.
5. Connect the cable shield/screen to a suitable ground (earth) at one end only.
6. Replace the cover, tighten the cable gland, and connect the power supply.
Note
The Rosemount 3101 and 3102 are not intrinsically safe and are for use in
non-hazardous (Ordinary Location) installations only.
If HART communications is required (available on the Rosemount 3102 and
3105), a 250 Ohm (minimum), 0.25 W load resistor must be installed in the
loop. When using the Rosemount 3102 or 3105 transmitter with a
Rosemount 3490 Series Control Unit, this resistor is not required.
Figure 3. Wiring Diagram for Rosemount 3101
A. Maximum cable length is 9750 ft. (3000 m)
B. Connect the cable shield/screen to ground (earth) in the control room
C. Cable thickness: Ø0.15 to 0.31 in. (Ø4 to 8 mm)
D. Twisted-pair, screened wires
Minimum size: 0.22 mm2(24 SWG / 23 AWG); Maximum: 1.5 mm2(16 SWG / 18 AWG)
E. Minimum of 12 Vdc is required at the transmitter for it to operate
A
12 to 30 Vdc
0 Vdc
D
E
B
C
3101

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Figure 4. Wiring Diagram for Rosemount 3102
A. Maximum cable length is 9750 ft. (3000 m)
B. Connect the cable shield/screen to ground (earth) in the control room
C. Cable thickness: Ø0.15 to 0.31 in. (Ø4 to 8 mm)
D. Twisted-pair, screened wires
Minimum size: 0.22 mm2(24 SWG / 23 AWG); Maximum: 1.5 mm2(16 SWG / 18 AWG)
E. Minimum of 12 Vdc is required at the transmitter for it to operate
Figure 5. Wiring Diagram for Rosemount 3105
A. Maximum cable length is 9750 ft. (3000 m)
B. Connect the cable shield/screen to ground (earth) in the control room
C. Cable thickness: Ø0.15 to 0.31 in. (Ø4 to 8 mm)
D. Twisted-pair, screened wires
Minimum size: 0.22 mm2(24 SWG / 23 AWG); Maximum: 1.5 mm2(16 SWG / 18 AWG)
E. Minimum of 12 Vdc is required at the transmitter for it to operate
Transmitter terminals:
1 (+): +24 Vdc
2 (-): 0 Vdc
3+4: Relay 1 (SPST)
5+6: Relay 2 (SPST)
7+8: Remote temperature sensor
C
D
E
12 to 40 Vdc
0 Vdc
A
3102
B
Transmitter terminals:
1 (+): +24 Vdc
2 (-): 0 Vdc
7+8: Remote temperature sensor
D
E
12eyp to 40 Vdc (non-IS application) OR
12 to 30 Vdc from barrier (IS application)
0 Vdc
A
C
B

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6.0 Mounting the transmitter above a liquid surface
A 2-in. thread is provided to mount the transmitter. The thread form is either
BSPT or NPT, and is clearly marked on the hexagon of the transmitter body.
To help with an installation, flange accessories and bracket kits are available
from Emerson. The accessory flanges supplied are manufactured from PVC and
are a full face design. Care must be taken when installing to raised face mating
flanges on the tank or vessel to prevent distortion of the PVC flange by
over-tightening the bolts (see “Installation instructions” on page 11).
Refer to Rosemount 3101, 3102, and 3105 Product Data Sheet on
Emerson/Rosemount.com for accessory ordering information.
6.1 Bracket mounting
The bracket kit contains a stainless steel angle bracket and PVC threaded disc
(Figure 6), which may be used to mount the transmitter on a support over the
liquid surface.
Installation instructions
1. Attach bracket to the disc using the three screws provided.
2. Attach the assembled bracket and disc to a rigid support over the liquid
surface.
The bracket may be bolted to a suitable cross member. Ensure the
transmitter is perpendicular to the surface to maximize the return echo size.
3. Use PTFE tape on the transmitter’s screw thread.
4. Insert the transmitter into the disc.
5. Tighten to a torque of 1.5 ft-lb (2 N-m) using the transmitter’s hexagon.
Do not use the transmitter housing to tighten.
Figure 6. Bracket Mounting
A. Stainless steel bracket
B. No. 4X 13 long self tap screws (x3), carbon steel (zinc plated)
C. PVC disc
C
A
B

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6.2 Installing in a tank with a nozzle or stand-off
Installation instructions
1. Use PTFE tape on the screw thread of the transmitter.
2. If the tank has a flanged nozzle or stand-off:
a. Attach the transmitter to a non-metal instrument flange using the
threaded connection. Tighten to a torque of 1.5 lb-ft (2 N-m) using the
transmitter’s hexagon.
b. The instrument (accessory) flanges supplied by Emerson™are
manufactured from PVC and are a full face design. Care must be taken
when installing to a raised face mating flange on the tank or vessel to
prevent distortion of the PVC flange by over-tightening the bolts.
c. Ensure the gasket is sitting correctly on the nozzle/tank flange.
d. Lower the assembled transmitter and instrument flange onto the tank
flange, and secure with appropriate bolting to a suitable torque for the
flanges.
If mating to a raised face flange (RF) on the tank nozzle or stand-off, tighten
to a maximum torque of 10 lb-ft (13.6 N-m).
3. If the tank has a threaded nozzle or stand-off:
a. Attach the transmitter to the nozzle/stand-off using the threaded
connection.
b. Tighten to a torque of 1.5 lb-ft (2 N-m) using the transmitter’s hexagon.
If the transmitter face does not protrude into the vessel, refer to the installation
section in the Reference Manual for further information.
Figure 7. Flange Mounting
A. Transmitter is mounted vertically (maximum deviation of 3°)
B. Use non-metallic fitting or flange
C. 6° Beam half angle
D. 1.3 in./ft (11 cm/m), minimum of 12 in. (0,3 m)
A
D
B
C

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Quick Start Guide
6.3 Open channel flow installations
Mount an ultrasonic transmitter over an area of clear liquid. Avoid mounting the
transmitter directly over any inlet stream. Never suspend the transmitter by the
cable.
Positioning of the transmitter is critical and should be the correct distance
upstream from the flow structure as stated in the relevant standard for your
country.
For example, in the ISO standards, the distance should be four to five times the
maximum height of the water (Hmax) for a thin plate weir, or three to four times
Hmax for a flume. For optimum accuracy, the transmitter’s front face should be
positioned at a height equal to the sum of the maximum flow depth plus the
transmitter dead band of 12.2 in. (300 mm) plus an extra 2 in. (50 mm).
Figure 8. Choosing the Height Position Above a Flow
A. Transmitter front face
B. Hmax
C. Transmitter bottom reference = Hmax + 12.2 in. (300 mm) + 2 in. (50 mm)
It is important that the bottom reference of the transmitter should be related to
the datum of the primary measuring device (Figure 9).
Figure 9. Bottom Reference of a Flume or Weir
A. Transmitter bottom reference C. Approach channel
B. Primary device (e.g. flume, weir) Invert D. Flow direction
C
B
A
A
D
CB

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When setting the bottom reference on a ‘V’- notch weir (Figure 10), it is
important the true invert is used and not the meniscus level.
Figure 10. Bottom Reference of ‘V’-notch Weir
A. Transmitter bottom reference (i.e. true invert) b. Meniscus level
Note
The transmitter should be free from a situation where it is likely to 'drown'
(refer to the relevant standard for further information).
If the flow structure permits, mount the transmitter within the flow channel
or chamber. Shroud the transmitter from direct sunlight for maximum
accuracy and stability.
The Rosemount 3102 and Rosemount 3105 have the option of a Remote
Temperature Sensor (RTS). This temperature sensor should be mounted in a
location where it can get an accurate air temperature measurement and is
protected from sunlight. (See Quick Installation Guide for further RTS
installation information).
A
B

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Quick Start Guide
Configuring the transmitter
Each transmitter can be configured and verified using the integral buttons.
Alternatively, the Rosemount 3102 and Rosemount 3105 can be configured and
verified using a Field Communicator, Rosemount 3490 Series Control Unit, or a
PC running AMS Device Manager (see Figure 11).
The parameters described in this section are sufficient for a basic level
application.
For menu maps and how to configure more advanced level, contents (volume),
or open channel flow applications, refer to the Rosemount 3100 Series
Reference Manual.
Note
Transmitters are pre-configured for level measurement. It may not be necessary to
proceed with this step unless needing to verify or change the settings.
Figure 11. System Architecture
A. Rosemount 3100 Series Transmitter
B. Remote temperature sensor (optional accessory for the 3102 and 3105 only)
C. Two relay outputs (on the Rosemount 3102 only)
D. Rosemount 3490 Series Controller
E. Field communicator
F. HART modem
G.AMS Device Manager
H.Control system
J. 751 Display
3490
Fn
123
456
789
0-
.
3491
Model type:
C
A
J
H
F
G
E
D
B

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6.4 Transmitter base units
The Base Units for the Rosemount 3101 are always metric, but changing the
Display Units re-scales the level measurement from meters-to-feet or
meters-to-inches (see page 19).
When the Rosemount 3102 and 3105 are shipped from the factory, the default
settings for Base Units are “metric” or “imperial ft” depending on the model
order code.
Note (Rosemount 3102/3105 only)
Keep a record of your programmed settings. If the base units are changed on the
Rosemount 3102 or 3105, the transmitter automatically re-starts as if it were a new
instrument on first power-up, but will default to the chosen base units and load factory
default values.
Method: Integral buttons
(The Rosemount 3101 always operates in meters. See page 19 for how to change
Display Units).
To change the Base Units on the Rosemount 3102 and 3105:
1. From the PV display, press the blue button → to indicate the “DiAg”.
2. Hold down the blue button →for two seconds and then release
(“tESt” is displayed).
3. Hold down both the blue button →and red button ↵for two seconds
(“Eng” is displayed).
4. Press the green button ↓to indicate the first engineering menu option
“t.hoLd”.
5. Press the green button ↓ repeatedly until “b.unit” is indicated.
6. Press the blue button →to indicate the presently selected base units.
7. If these base units are correct, press the red button ↵.
(Press green button ↓for the next menu and skip steps 8 to 11).
8. Press the blue button →to start the editing mode (present base units flash).
9. Press the green button ↓repeatedly to scroll through the three options.
10.Press the blue button →to confirm the selected base units (flashing stops).
11.Press the red button ↵to save. (The transmitter automatically re-starts as if
it was a new instrument on first power-up). Otherwise, press the blue button
→to not save.

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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 Figure 12 on
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 Figure 13 on
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.
Set Base Units (ft)
m
ft
in
ft
ENTER
ABORT
(Field Communicator Screen Shown)
Base Units
Esc=Quit =Edit
metric
(Rosemount 3491 Screen Shown)

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September 2018
Method: Integral buttons
To view or change the Bottom Reference (b.rEF) setting:
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.
3. If this value is correct, press the red button ↵and then the green button ↓
to get to the next menu. Otherwise, continue with step (4).
4. Press the blue button →to start editing (first digit flashes).
5. Use the green button ↓to edit the flashing digit.
6. Press the blue button →to move to the next digit (that digit flashes).
7. Repeat steps (5) and (6) until the last digit is flashing and edited as required.
8. Press the blue button →to confirm the new b.rEF value (no digits flashing).
9. 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.
Method: Field Communicator or AMS
Device Manager
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.
Method: 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: 3102”).
3. Select DUTY and then select Bottom Ref.
4. Follow the on-screen instructions to input and save the new setting.
Bottom Reference P010
36.000 ft
36.000 ft
ESC
DEL ENTER
HELP
w
s
q
a
z
Lock
Shift
@ &
á ü
x
e
d
c
r
f
v
t
g
b
y
h
n
u
j
m
*
-
+
/
.
0
7
4
1
8
5
2
9
6
3
i
k
o
lFN
(Field Communicator Screen Shown)
Bottom Ref. P010
36.000ft
Esc=Quit =Edit
(Rosemount 3491 Screen Shown)

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Quick Start Guide
6.6 Transmitter duty / tank shape P011 / non-linear profile P011
The instructions here are for selecting level measurement on the Rosemount
3102 and 3105. The Rosemount 3101 duty is always level measurement.
For advanced applications, refer to the Rosemount 3100 Series Reference
Manual.
Method: Integral buttons
To change or view the duty:
1. From the PV display, press the green button ↓to indicate “dutY”.
2. Press the blue button → to display the presently selected duty.
3. If the duty is “LEVEL”, press the red button ↵and then the green button ↓
to get to the next menu. Otherwise, continue with step (4).
4. Press the blue button →to start the editing mode (duty flashes).
5. Press the green button ↓repeatedly until “LEVEL” appears.
6. Press the blue button →to confirm the duty (flashing stops).
7. Press the red button ↵to save the duty setting, or press the blue button →
to not save. Afterwards, depending on the action taken, either the “dutY”
menu or the next menu appears.
Method: Field Communicator or AMS Device Manager
To change the tank shape / non linear profile:
1. From the Home screen,
select 2: Configure.
2. Select 2: Manual Setup.
3. Select 3: Profiling.
4. Select 2: Set Non-Linear Profile.
5. Select Linear and then press ENTER to
save the selection.
6. Press SEND to update the transmitter.
7. The selected profile can be viewed at
Fast Key sequence 2, 2, 3, 3.
Note
When on-screen messages appear, take appropriate action if needed and press “OK”.
Select Non-Linear Profile: (Linear)
Linear
Special Plotted
Horizontal Cylinder Flat
Spherical
Horizontal Cylinder Domed
Flume/weir (3/2)
V notch (5/2)
Linear
ENTER
ABORT
(Field Communicator Screen)

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September 2018
Method: Rosemount 3490 Series Control Unit
To change the tank shape / non linear profile:
1. From the Main Menu screen, select
SETUP.
2. Select the transmitter (e.g. “Tx1: 3102”).
3. Select DUTY and then select Tank Shape.
4. Follow the on-screen instructions to
select Linear and save the new setting.
6.7 Transmitter display units / primary variable units (P012)
On the Rosemount 3101, display units are indicated by the position of the
decimal point in the displayed PV value i.e. 8.000 (m), 26.24 (ft.), or 314.9 (in.).
The 3101 measures and calculates in meters. The measured value is converted
into the selected display units using a pre-programmed conversion factor.
On the Rosemount 3102 and 3105, selecting new display units does not
automatically re-scale the PV value. Either use the parameter Transmitter Scale
Factor (page 20) to manually re-scale the PV value into appropriate units, or use
base units which automatically changes the display units to meters, feet, or
inches.
Method: Integral buttons
To change Display Units on the Rosemount 3101:
1. Starting from the PV display, hold down the blue button →and do not
release it. After 10 seconds, the displayed units change according to the
following sequence:
3101****SC**: Meters to Feet, Feet to Inches, and Inches to Meters
3101****RC**: Feet to Inches, Inches to Meters, and Meters to Feet
2. Continue to hold down the blue button →to cycle through units every three
seconds.
3. Confirm the display units by releasing the blue button →.
To change Display Units on the Rosemount 3102 and 3105:
1. From the PV display, press the green button ↓repeatedly until the “b.unit” is
indicated.
2. Press the blue button → to indicate the presently selected units on the
bottom line.
3. If the units are correct, press the red button ↵and then the green button ↓
to get to the next menu. Otherwise, continue with step (4).
4. Press the blue button →to start the editing mode (present units flash).
5. Press the green button ↓repeatedly to scroll through the list of units.
6. Press the blue button →to confirm the new units. The flashing stops.
Tank Shape P011
Linear
Esc=Quit =Edit
(Rosemount 3491 Screen)

September 2018
20
Quick Start Guide
7. Press the red button ↵to save the setting. (The display momentarily goes
blank, and then all the segments of the display will briefly show as the
transmitter initiates a soft-start). Otherwise press the blue button →to not
save.
8. Afterwards, depending on the action taken in step (7), either the “b.unit”
menu or the next menu appears.
Method: Field Communicator or AMS
Device Manager
To change the PV Units:
1. From the Home screen, select
2: Configure.
2. Select 2: Manual Setup and then select
3: Profiling.
3. Select 1: Primary Variable Units P012.
4. Select new units and then press ENTER to save.
5. Press SEND to update the transmitter.
Method: Rosemount 3490 Series Control Unit
To change the PV Units:
1. From the Main Menu screen, select
SETUP.
2. Select the transmitter
(e.g. “Tx1: 3102”).
3. Select UNITS and then select PV Units.
4. Follow the on-screen instructions to select and confirm the new setting.
6.8 Transmitter Scale Factor P013 / PV Scale Factor P013
On the Rosemount 3102 and 3105, this parameter converts the level
measurement into alternative units before being output. Enter a value of 1.0
unless the base units are different to the displayed units, or the required display
units could not be selected.
Method: Integral buttons
To view or change the scale factor:
1. From the PV display, press the green button ↓repeatedly until the “SCALE” is
indicated.
2. Press the blue button →to display the present scale factor.
3. If the scale factor is correct, press the red button ↵and then the green
button ↓to get to the next menu. Otherwise, continue with step (4).
4. Press the blue button →to start the editing mode (first digit flashes).
5. Press the green button ↓repeatedly to edit the flashing digit.
6. Press the blue button →to move to the next digit (that digit flashes).
Primary Variable Units P012
ft
Cum
Cum/h
Cum/s
ft
gal/min
Impgal
Impgal/d
ft
ENTER
ESC
(Field Communicator Screen)
PV Units P012
ft
Esc=Quit =Edit
(Rosemount 3491 Screen)