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
C.2 Basic setup
C.2.1 Engineering units
Sets the unit of measure for length, temperature, and volume flow.
Option Length unit Temperature unit Volume flow unit
Metric m °C m
3
/h
Imperial inch °F US gal/h
After appropriate units have been selected, all configuration parameters and transmitter
variables will be expressed in these units.
C.2.2 Reference height
Distance between the Device Reference Point and Zero Level.
Figure C-2: Reference Height
A
B
C
D
A
B
C
A. Device Reference Point
B. Reference Height
C. Zero Level
D.
0.6 in. (15 mm)
Ensure the Reference Height is set as accurate as possible. The transmitter measures the
distance to the product surface and subtracts this value from the Reference Height to
determine the level.
Configuration parameters Reference Manual
May 2021 00809-0200-4480
80 Rosemount 1408A Level and Flow Transmitter