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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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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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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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