Emerson Rosemount 1208C User manual

Reference Manual
00809-0200-7062, Rev AA
March2023
Rosemount™ 1208C Level and Flow
Transmitter
Non-Contacting Radar

Safety messages
NOTICE
Read this manual before working with the product. For personal and system safety, and for optimum product
performance, make sure you thoroughly understand the contents before installing, using, or maintaining this
product.
For technical assistance, contacts are listed below:
Customer Central
Technical support, quoting, and order-related questions.
•United States - 1-800-999-9307 (7:00 am to 7:00 pm CST)
•Asia Pacific- 65 777 8211
North American Response Center
Equipment service needs.
•1-800-654-7768 (24 hours a day — includes Canada)
•Outside of these areas, contact your local Emerson representative.
WARNING
Failure to follow safe installation and servicing guidelines could result in death or serious injury.
Ensure the transmitter is installed by qualified personnel and in accordance with applicable code of practice.
Inspection and maintenance of this equipment shall be carried out by suitably trained personnel, in accordance with
the applicable standards and code of practice.
Use the equipment only as specified in this manual. Failure to do so may impair the protection provided by the
equipment.
Repair, e.g. substitution of components, etc. may jeopardize safety and is under no circumstances allowed.
WARNING
Explosions could result in death or serious injury.
To prevent ignition of flammable or combustible atmospheres, disconnect power before servicing.
Before connecting a handheld communicator in an explosive atmosphere, ensure that the instruments are installed in
accordance with intrinsically safe or non-incendive field wiring practices.
WARNING
Process leaks could result in death or serious injury.
Handle the transmitter carefully.
Install and tighten process connectors before applying pressure.
Do not attempt to loosen or remove process connectors while the transmitter is in service.
WARNING
Physical access
Unauthorized personnel may potentially cause significant damage to and/or misconfiguration of end users’
equipment. This could be intentional or unintentional and needs to be protected against.
Physical security is an important part of any security program and fundamental in protecting your system. Restrict
physical access by unauthorized personnel to protect end users’ assets. This is true for all systems used within the
facility.
2

CAUTION
Hot surfaces
The transmitter and process seal may be hot at high process temperatures. Allow to cool before servicing.
3

4

Contents
Chapter 1 Introduction...............................................................................................................................7
1.1 Using this manual........................................................................................................................7
1.2 Product certifications.................................................................................................................. 7
1.3 Open source licenses.................................................................................................................. 7
1.4 Product recycling/disposal......................................................................................................... 7
Chapter 2 Transmitter overview............................................................................................................... 9
2.1 Measurement principle...............................................................................................................9
2.2 Process characteristics................................................................................................................9
2.3 Vessel characteristics................................................................................................................10
2.4 Non-contacting radar technology........................................................................................... 10
2.5 Components of the transmitter...............................................................................................12
2.6 System integration.................................................................................................................... 13
Chapter 3 Mechanical installation.......................................................................................................... 15
3.1 Safety messages........................................................................................................................15
3.2 Installation considerations.......................................................................................................15
3.3 Bracket mounting......................................................................................................................19
3.4 Installing on a tank....................................................................................................................26
Chapter 4 Electrical installation..............................................................................................................29
4.1 Safety messages........................................................................................................................29
4.2 Prepare the electrical connections..........................................................................................29
4.3 Power up transmitter................................................................................................................31
4.4 Optional devices........................................................................................................................ 31
Chapter 5 Configuration.......................................................................................................................... 33
5.1 Safety messages........................................................................................................................33
5.2 Overview.....................................................................................................................................33
5.3 Configuration tools................................................................................................................... 34
5.4 Confirm correct device driver.................................................................................................. 34
5.5 AMS Device Configurator......................................................................................................... 34
5.6 Configure transmitter using guided setup............................................................................ 34
5.7 Multidrop communication....................................................................................................... 35
5.8 Write protect a transmitter...................................................................................................... 35
Chapter 6 Operation and maintenance................................................................................................. 37
6.1 Safety messages........................................................................................................................37
6.2 View measurement data.......................................................................................................... 38
6.3 Check device status...................................................................................................................38
Chapter 7 Service and troubleshooting................................................................................................. 41
7.1 Safety messages........................................................................................................................41
7.2 Diagnostic messages per NAMUR NE 107............................................................................. 42
7.3 Troubleshooting guides........................................................................................................... 48
7.4 Managing disturbance echoes................................................................................................ 63
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7.5 Service and troubleshooting tools.......................................................................................... 64
7.6 Service support..........................................................................................................................66
Appendix A Specifications and reference data........................................................................................ 67
A.1 Performance specifications..................................................................................................... 67
A.2 Functional specifications..........................................................................................................69
A.3 Physical specifications.............................................................................................................. 71
A.4 Dimensional drawings..............................................................................................................73
Appendix B Configuration parameters..................................................................................................... 76
B.1 Menu tree...................................................................................................................................76
B.2 Device setup.............................................................................................................................. 76
B.3 Level setup................................................................................................................................. 80
Contents Reference Manual
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6 Rosemount 1208C Level and Flow Transmitter

1 Introduction
1.1 Using this manual
The sections in this manual provide information on installing, operating, and maintaining
the Rosemount™ 1208C Level and Flow Transmitter – Non-Contacting Radar.
The sections are organized as follows:
Transmitter overview provides an introduction to theory of operation, a description of the
transmitter, information on typical applications, and process characteristics.
Mechanical installation contains mechanical installation instructions.
Electrical installation contains electrical installation instructions.
Configuration provides instructions on configuration of the transmitter.
Operation and maintenance contains operation and maintenance techniques.
Service and troubleshooting provides troubleshooting techniques for the most common
operating problems.
Specifications and reference data supplies reference and specification data.
Configuration parameters provides extended information about the configuration
parameters.
1.2 Product certifications
See the Rosemount 1208C Product Certifications document for detailed information on the
existing approvals and certifications.
1.3 Open source licenses
This device uses open source software. Further information can be found in the
License Information document available at Emerson.com/Rosemount.
1.4 Product recycling/disposal
Recycling of equipment and packaging should be taken into consideration and disposed of
in accordance with local and national legislation or regulations.
Related information
Service support
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Introduction Reference Manual
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2 Transmitter overview
2.1 Measurement principle
The Rosemount 1208C is a two-wire transmitter for continuous level measurements using
fast-sweep Frequency Modulated Continuous Wave (FMCW) technology.
The transmitter continuously emits signal sweeps with a constantly varying frequency
towards the product surface. Since the transmitter continuously changes the frequency of
the transmitted signal, there will be a difference in frequency between the transmitted and
the reflected signals (see Figure 2-1).
The frequency of the reflected signal is subtracted from the frequency of the signal
transmitted at that moment, resulting in a low frequency signal which is proportional to
the distance to the product surface. This signal is further processed to obtain fast, reliable,
and highly accurate level measurements.
Figure 2-1: FMCW-method
d
fin
fmax
fmin
fout
fin fout
t
f
A
C
D
B
Δf∼d=distance
A. Frequency (GHz)
B. Time (s)
C. Transmitted signal
D. Reflected signal
The Rosemount 1208C can also calculate the volume flow rate in an open channel.
2.2 Process characteristics
2.2.1 Dielectric constant
A key parameter for measurement performance is reflectivity. A high dielectric constant of
the media provides better reflection and enables a longer measuring range.
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2.2.2 Foam and turbulence
Foaming liquids or turbulence may cause weak and varying surface echo amplitudes.
Surface turbulence is not normally a problem unless it is excessive.
Measurement in foamy applications depends largely on the foam properties. When the
foam is light and airy, the actual product level is measured. For heavy and dense foam, the
transmitter may measure the level of the foam’s upper surface.
2.3 Vessel characteristics
2.3.1 In-tank obstructions
The transmitter should be mounted so that objects such as heating coils, ladders, and
agitators are not in the radar signal path. These objects may cause false echoes resulting
in reduced measurement performance. However, the transmitter has built-in functions
designed to reduce the influence from disturbing objects where such objects cannot be
totally avoided.
Vertical and inclined structures cause minimal effect since the radar signal is scattered
rather than directed back to the antenna.
2.4 Non-contacting radar technology
Non-contacting radar technology is ideal for a wide range of applications as it is
maintenance-free, has a top-down installation that reduces the risk of leakages, and is
unaffected by process conditions such as density, viscosity, temperature, pressure, and pH.
The Rosemount 1208C uses Frequency Modulated Continuous Wave (FMCW) technology
and smart algorithms to maximize measurement accuracy and reliability, even in small
tanks and challenging fast-filling vessels.
2.4.1 Application examples
Level and pump control
Pump stations need accurate measurement and control to ensure an optimal water flow to
the next stage of the potabiliztion process, while also avoiding overflows and pumps from
dry-running. Level measurement is essential to ensure a sustainable extraction of water
and a sufficient supply of water to the next phases of the potabilization process.
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Open channel flow
Open-air channels transport water from a water source to a water plant where it will be
processed. Flow monitoring in open channels is important to know the amount of water
that is flowing to comply with regulations and avoid flooding.
Differential level
In the screening process level measurement is necessary to monitor the level of water in
the different parts of the screen, which will determine when to start the cleaning of the
sieve.
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Tank volume
Storage tanks are used in water processes to store chemical substances, which are needed
to treat the water. Level measurement is necessary to monitor, optimize chemical dosing,
and avoid overfilling.
2.5 Components of the transmitter
Figure 2-2: Components
A
C
E
B
D
A. M12 male connector (A-coded)
B. Transmitter housing
C. Gasket for G threaded version
D. NPT 1½-in. or ISO 228/1-G1½-in. thread
E. Antenna
Related information
Dimensional drawings
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2.6 System integration
The transmitter is loop-powered, and uses the same two wires for power supply and
output signal. The output is a 4-20 mA analog signal superimposed with a digital HART®
signal.
With the HART protocol, multidrop configuration is possible. In this case, communication is
restricted to digital, since current is fixed to the 4 mA minimum value.
Figure 2-3: System Architecture
B
A
C
F
D
E
A. Rosemount 1208C
B. Rosemount 751 Field Signal Indicator
C. Handheld communicator
D. HART modem
E. PC with AMS Device Configurator
F. Host/DCS system
The Rosemount 1208C is compliant with NAMUR NE 107 Field Diagnostics for standardized
device diagnostic information.
2.6.1 Easy integration into control systems
Connect the Rosemount 1208C to your host system or visualize and control your
process data by pairing with the Rosemount 3490 Controller. The controller provides
comprehensive control functionality for any of your 4–20 mA or HART compatible devices.
Related information
Rosemount 3490 Reference Manual
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14 Rosemount 1208C Level and Flow Transmitter

3 Mechanical installation
3.1 Safety messages
Instructions and procedures in this section may require special precautions to ensure
the safety of the personnel performing the operations. Information that potentially raises
safety issues is indicated by a warning symbol ( ). Refer to the following safety messages
before performing an operation preceded by this symbol.
WARNING
Failure to follow safe installation and servicing guidelines could result in death or
serious injury.
Ensure the transmitter is installed by qualified personnel and in accordance with applicable
code of practice.
Inspection and maintenance of this equipment shall be carried out by suitably trained
personnel, in accordance with the applicable standards and code of practice.
Use the equipment only as specified in this manual. Failure to do so may impair the
protection provided by the equipment.
Repair, e.g. substitution of components, etc. may jeopardize safety and is under no
circumstances allowed.
WARNING
Explosions could result in death or serious injury.
To prevent ignition of flammable or combustible atmospheres, disconnect power before
servicing.
Before connecting a handheld communicator in an explosive atmosphere, ensure that the
instruments are installed in accordance with intrinsically safe or non-incendive field wiring
practices.
WARNING
Process leaks could result in death or serious injury.
Handle the transmitter carefully.
Install and tighten process connectors before applying pressure.
Do not attempt to loosen or remove process connectors while the transmitter is in service.
3.2 Installation considerations
Before installing the transmitter, follow recommendations for mounting position, sufficient
free space, nozzle requirements, etc.
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3.2.1 Mounting position
When finding an appropriate location on the tank for the transmitter, the conditions of the
tank must be carefully considered.
Consider the following guidelines when mounting the transmitter:
•For optimal performance, the transmitter should be installed in locations with a clear
and unobstructed view of the product surface.
•The transmitter should be mounted with as few internal structures as possible within
the signal beam.
•Do not mount close to or above the inlet stream.
•Do not mount the transmitter on a manway cover.
•Do not position the transmitter directly over a side manway door.
•Multiple Rosemount 1208C transmitters can be used in the same tank without
interfering with each other.
Figure 3-1: Recommended Mounting Position
L
3.2.2 Free space requirements
If the transmitter is mounted close to a wall or other tank obstruction such as heating
coils and ladders, noise might appear in the measurement signal. See Table 3-1 for
recommended clearance.
Figure 3-2: Free Space Requirements
L
Table 3-1: Distance to Tank Wall (L)
Minimum Recommended
8 in. (200 mm) ½ of tank radius
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3.2.3 Inclination
The transmitter should be mounted vertically to ensure a good echo from the product
surface. See Figure 3-3 for recommended maximum inclination.
Figure 3-3: Inclination
90°
Max. 3°
3.2.4 Non-metallic tanks
Nearby objects outside the tank may cause disturbing radar echoes. Wherever possible,
the transmitter should be positioned so that objects close to the tank are kept outside the
signal beam.
3.2.5 Beam angle and beam width
The transmitter should be mounted with as few internal structures as possible within the
signal beam.
Figure 3-4: Beam Angle and Beam Width
D
W
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Beam angle (α)
8°
Beam width
See Table 3-2 for beam width at different distances.
Table 3-2: Beam Width
Distance (D) Beam width (W)
6.6 ft. (2 m) 0.9 ft. (0.3 m)
13.1 ft. (4 m) 1.8 ft. (0.6 m)
19.7 ft. (6 m) 2.8 ft. (0.8 m)
26.2 ft. (8 m) 3.7 ft. (1.1 m)
32.8 ft. (10 m) 4.6 ft. (1.4 m)
49.2 ft. (15 m) 6.9 ft. (2.1 m)
3.2.6 Nozzle requirements
To allow the microwaves to propagate undisturbed, the nozzle dimensions should be kept
within the specified limits as given in Table 3-3. The inside of the nozzle must be smooth
(i.e. avoid bad welding, rust, or deposit).
Figure 3-5: Mounting in Nozzles
D
H
Table 3-3: Nozzle Requirements
Nozzle diameter (D) Maximum nozzle height (H)
1.5 in. (40 mm) 5.9 in. (150 mm)
2 in. (50 mm) 7.9 in. (200 mm)
3 in. (80 mm) 11.8 in. (300 mm)
4 in. (100 mm) 15.8 in. (400 mm)
6 in. (150 mm) 23.6 in. (600 mm)
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3.3 Bracket mounting
3.3.1 Mount the standard bracket
Procedure
1. Mount the bracket on the pipe/ceiling/wall.
On pipe:
13 mm
or
On ceiling/wall:
T30
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2. Ensure the adjustable holder is directed toward the ground.
T30
90°
3. Install and hand tighten the transmitter.
Note
The nut is shipped with the transmitter.
Related information
Bracket hole pattern
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