Detailed Product Description

THE 3100 SERIES FEATURES:
Non-contacting measurement with no
moving parts
Integral LCD and push-buttons as standard
for on-site programming
Continuous measurement of level or
distance-to-surface. Volume or open channel
flow calculations for The Rosemount 3102
and Rosemount 3105
Two integral signal relays for
The Rosemount 3102
Easy to install and configure
Rugged aluminum housing and PVDF wetted
material
Two-wire direct current loop-powered
MEASUREMENT PRINCIPLE
Ultrasonic pulse signals are transmitted and reflected
from the liquid surface. The transmitter listens for
reflected signals (echoes) and measures the
time-delay between transmitting and receiving.
The distance to the liquid surface is automatically
calculated using the computed time-delay.
Distance = Speed of sound in air * (Time-delay / 2)
An integral temperature
sensor continuously
measures the air
temperature around the
transmitter. It then
computes the speed of
sound in air, automatically
compensating the Distance
for temperature effects.
The 3102 and 3105 have a
Remote Temperature
Sensor option.
The Distance
measurement can be sent
through the 420 mA or
HART® output.
Level Measurement
When programmed with the bottom reference of the
application, usually the tank bottom, the transmitter
will calculate the liquid depth (Level).
The calculated Level can be sent through the
420 mA or HART output.
Volume Measurement
The Rosemount 3102 and Rosemount 3105 can
calculate the volume of liquid in a tank. The
transmitter has a library of profile shapes for
selection.
The calculated Volume can be sent through the
4-20 mA or HART output.
Open Channel Flow Measurement
The Rosemount 3102 and Rosemount 3105 can also
calculate the rate of liquid flow in an open channel.
The transmitter has a library of standard open
channel flow structure profiles, but also supports a
user-defined flow profile that is plotted or calculated.
A ten-point strapping table for non-standard tank
shapes and flow structures can be input into the
transmitter.
The calculated Flow Rate can be sent through the
420 mA or HART output.
SPECIAL FEATURES
Advanced software features
Learn routine (false echo registration)
The transmitter can learn to ignore up to four false
echoes, caused by the pulse signal reflecting off
obstructions, until the actual level is seen.
Empty tank mapping
When a tank is empty, the transmitter can learn
to ignore up to four false echoes, without the
need for user interaction.
Present depth
When the tank is not empty, the bottom reference
can be automatically reset to the sum of a known
user-entered depth and the distance to the
surface.
Set as empty
When the tank is empty, the bottom reference
can be automatically reset to the measured
distance.
Distance offset
The distance to the surface can be adjusted by a
user-entered positive or negative offset value.
Level offset
The level can be adjusted by a user-entered
positive or negative offset value.
Bottom blanking
The transmitter can be set to ignore an area of
the tank bottom, if there is an obstruction, to
avoid false echoes.
Relays on The Rosemount 3102
Two integral relays for control functionality.
Integral display and push buttons
The central area of the display allows up to five
alphanumeric measurement or data characters to
assist when programming.
On The Rosemount 3102 and 3105, to the left of the
central area are four arrow icons, only one of which
will be lit at any one time to indicate the
measurement chosen by the user:
D (Distance-to-surface)
L (Level)
C (Content / Volume)
F (Flow)
On The Rosemount 3102, to the right of the central
area are two arrow icons that indicate the status of
the transmitter relay outputs RL1 and RL2. When lit,
they indicate that the relay contact is closed.
Under the central area is a list of measurement units,
where the transmitter will light the measurement units
chosen.
To the right of the measurement units is an echo
received icon made up of three arc segments that
indicate the strength of the echo received.
Remote temperature sensor option
All models have an integrated sensor to
automatically compensate for temperature effects.
For transmitter installations where the integral
temperature sensor is not representative of the air /
medium temperature in the process, the use of an
external temperature sensor improves reliability.
The sensor is installed in between the transmitter
and the liquid surface, or in a shaded area of an open
channel.
Sensor Specification:
Stainless steel type 316 body with locknut
(shown above)
M10 thread, 0.24-in. (6-mm) maximum panel
thickness
Sensor working temperature:
40 to 185 °F (40 to 85 °C)
Cable working temperature:
4 to 176 °F (20 to 80 °C)
Cable 16.4 ft (5 m) long, single twisted pair
Overview of models
The Rosemount 3101 is for simple level or distance
measurements over a range of 1 to 26 ft (0,3 to 8 m),
and a 420 mA signal output.
The 3102 has two integral relays for level or distance
measurements over a range of 1 to 36 ft (0,3 to 11 m).
It also features volume and open channel flow
calculations, and a 420 mA / HART output.
The 3105, certified Intrinsically Safe, is for level or
distance measurements over a range of
1 to 36 ft (0,3 to 11 m) in hazardous areas. It also
features volume and open channel flow calculations,
and a 420 mA / HART output.
Housing
The housing is available in aluminum, and has
two 1/214 NPT cable/conduit entries.
Option of M20 x 1.5 conduit/cable adaptors.
Wetted parts are made of corrosion resistant PVDF.
Process Connection
Threaded Connection
Threads: 2-in. BSPT or 2-in. NPT.
Optional flange accessories: See page 18.
Electrical connections
Power supply
The 3100 Series requires an external power supply:
3101: 12 to 30 Vdc
3102: 12 to 40 Vdc
3105: 12 to 40 Vdc, (12 to 30 Vdc in hazardous area)
Signal output
The 3101 has an analog 420 mA output, which is
powered by the voltage supplied to the transmitter.
The 3102 and 3105 have a 420 mA output with
HART communication, powered by the voltage
supply to the transmitter.
Relay outputs
The 3102 has two relay outputs, powered by the
voltage supply to the transmitter.
Remote temperature sensor
All models have an integrated sensor for
automatically compensating for temperature effects.
The 3102 and 3105 have support for connecting a
Rosemount Remote Temperature Sensor, an
optional accessory that automatically
overrides the integral sensor and provides dynamic
temperature compensation.
Measurements and Calculations
3101: Level, or distance to the surface.
3102: Level (or distance), volume, open channel flow.
3105: Level (or distance), volume, open channel flow.
Measurement range
3101: 1 to 26 ft (0,3 to 8 m)
3102: 1 to 36 ft (0,3 to 11 m)
3105: 1 to 36 ft (0,3 to 11 m)
Product certifications
Non-hazardous area installation.