Emerson Rosemount 1208C Manuale utente
Quick Start Guide
00825-0200-7062, Rev AA
February2023
Rosemount™ 1208C Level and Flow
Transmitter
Non-Contacting Radar
Contents
About this guide...........................................................................................................................3
Installing on a tank...................................................................................................................... 5
Prepare the electrical connections............................................................................................ 8
Power up transmitter................................................................................................................ 10
Configuration............................................................................................................................. 11
Quick Start Guide February2023
2 Rosemount 1208C Level and Flow Transmitter
1 About this guide
This Quick Start Guide provides basic guidelines for the Rosemount
1208C Level and Flow Transmitter. Refer to the 1208C Reference
Manual for more instructions.
1.1 Safety messages
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.
Use the equipment only as specified in this Quick Start Guide and the
Reference 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.
February2023 Quick Start Guide
Quick Start Guide 3
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 to protecting your system. Restrict physical access by
unauthorized personnel to protect end users’ assets. This is true for
all systems used within the facility.
CAUTION
Hot surfaces
The transmitter and process seal may be hot at high process
temperatures. Allow to cool before servicing.
1.2 Bracket mounting
See the documentation supplied with the bracket kit.
Quick Start Guide February2023
4 Rosemount 1208C Level and Flow Transmitter
2 Installing on a tank
2.1 Mount the flange
Procedure
1. Place a suitable gasket on the tank flange.
2. Place the flange over the gasket.
3. Tighten the bolts and nuts with sufficient torque for the flange
and gasket choice.
4. Apply appropriate thread sealant to the transmitter threads.
Note
Only for NPT threaded tank connection.
February2023 Quick Start Guide
Quick Start Guide 5
5. Install and hand tighten the transmitter.
Note
The gasket is necessary for the G threaded version only.
2.2 Mount the NPT threaded adapter
Procedure
1. Apply appropriate thread sealant to the outer threads.
2. Mount the threaded adapter on the tank.
60 mm
Quick Start Guide February2023
6 Rosemount 1208C Level and Flow Transmitter
3. Apply appropriate thread sealant to the transmitter threads.
4. Install and hand tighten the transmitter.
February2023 Quick Start Guide
Quick Start Guide 7
3 Prepare the electrical connections
3.1 Connector type
M12 male (A-coded)
3.2 Cable selection
Use 24-18 AWG wire (0.20-0.75 mm2). Twisted pairs and shielded
wiring are recommended for environments with high EMI
(electromagnetic interference).
3.3 Internal power consumption
< 0.8 W in normal operation
3.4 Cable shield grounding
Make sure the instrument cable shield is:
•Continuously connected throughout the segment.
•Connected to a good earth ground at the power supply end.
3.5 Power supply
The transmitter operates on 14-35 Vdc at the transmitter terminals.
3.6 Load limitations
For HART® communication, a minimum loop resistance of 250 Ω is
required. Maximum loop resistance (R) is determined by the voltage
level of the external power supply (UE):
R = 44.4 × (UE − 14)
Quick Start Guide February2023
8 Rosemount 1208C Level and Flow Transmitter
Figure 3-1: Load Limits
R (Ω)
UE
(Vdc)
444
250
930
14 3524
19.6
0
200
400
600
800
3.7 Wiring diagram
Figure 3-2: Connection
4
1
3
2
BN
WH
BK
BU
1
4
2
3
NC
L+
L
NC
Table 3-1: Pin Assignment
Pin Wire color(1) Signal
1 BN Brown L+ 24 V
2 WH White NC Not connected
3 BU Blue L- 0 V
4 BK Black NC Not connected
(1) According to IEC 60947-5-2.
February2023 Quick Start Guide
Quick Start Guide 9
4 Power up transmitter
Procedure
1. Verify the power supply is disconnected.
2. Insert the M12 connector gently.
Note
Do not force the connector into place. Check that it is aligned
properly.
3. Once fully inserted, turn the screw ring until tight.
See the manufacturer’s instruction manual for recommended
torque.
4. Connect the power supply.
Quick Start Guide February2023
10 Rosemount 1208C Level and Flow Transmitter
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