Reference Manual
Table Of Contents
- Rosemount 1408A Level and Flow Transmitter
- Contents
- 1 Introduction
- 2 Transmitter overview
- 3 Mechanical installation
- 4 Electrical installation
- 5 Configuration
- 6 Operation and maintenance
- 7 Service and troubleshooting
- 7.1 Safety messages
- 7.2 Diagnostic messages
- 7.2.1 Device hardware fault – Device exchange
- 7.2.2 Device software fault – Check firmware revision
- 7.2.3 General power supply fault – Check availability
- 7.2.4 Parameter error – Check data sheet and values
- 7.2.5 Device memory failure – Restore default settings
- 7.2.6 Simulation active – Check operational mode
- 7.2.7 Level measurement lost – Check application
- 7.2.8 Device temperature over-run – Clear source of heat
- 7.2.9 Device temperature under-run – Insulate device
- 7.2.10 Short circuit – Check installation
- 7.2.11 Primary supply voltage over-run – Check tolerance
- 7.2.12 Primary supply voltage under-run – Check tolerance
- 7.2.13 Maintenance required - Cleaning
- 7.2.14 Max EEPROM write cycles expired – Check master and restart the device
- 7.2.15 Measurement range over-run – Check application
- 7.3 Troubleshooting incorrect level readings
- 7.3.1 Reported level is too high or low
- 7.3.2 Level is stuck in measuring range
- 7.3.3 Level is stuck in full tank
- 7.3.4 Level value drops when close to antenna
- 7.3.5 Measured level fluctuates
- 7.3.6 Measured level is occasionally unstable
- 7.3.7 Lagging of measured level
- 7.3.8 Incorrect level at 100% (20 mA)
- 7.3.9 Incorrect level when product surface is above 50%
- 7.3.10 Dropping of level close to tank bottom
- 7.3.11 Level measurement is lost in an empty tank
- 7.3.12 Alarm mode close to tank bottom
- 7.4 Managing disturbance echoes
- 7.5 Service and troubleshooting tools
- 7.6 Service support
- A Specifications and reference data
- A.1 Performance specifications
- A.2 Functional specifications
- A.3 Physical specifications
- A.4 Dimensional drawings
- B Product certifications
- C Configuration parameters
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
Beam angle (α)
10° (8° with antenna extension)
Beam width
See Table 3-2 for beam width at different distances.
Table 3-2: Beam Width (W)
Distance (D) Beam angle (α)
8° 10°
6.6 ft. (2 m) 0.9 ft. (0.3 m) 1.2 ft. (0.4 m)
13.1 ft. (4 m) 1.8 ft. (0.6 m) 2.3 ft. (0.7 m)
19.7 ft. (6 m) 2.8 ft. (0.8 m) 3.5 ft. (1.1 m)
26.2 ft. (8 m) 3.7 ft. (1.1 m) 4.6 ft. (1.4 m)
32.8 ft. (10 m) 4.7 ft. (1.4 m) 5.8 ft. (1.8 m)
Mechanical installation Reference Manual
May 2021 00809-0200-4480
16 Rosemount 1408A Level and Flow Transmitter