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
Low alarm
Enable or disable the low alarm.
Alarm set points
SP1 - High alarm set point
If the measured value is above this set point, the digital output is set to alarm state.
SP2 - Low alarm set point
If the measured value is below this set point, the digital output is set to alarm state.
Hysteresis
The hysteresis is a buffer zone so the alerts do not toggle on and off when the
measurement value fluctuates around the alarm limit. The alarm is set when the value
exceeds the alarm limit. The alarm is then cleared when the value falls outside the
hysteresis zone.
SP1 - Hysteresis high alarm
Hysteresis zone for the high alarm.
SP2 - Hysteresis low alarm
Hysteresis zone for the low alarm.
C.4 Analog output
C.4.1 Analog control variable
Select between volume flow or level to control the analog output.
C.4.2 Upper/lower range value
Enter the range values that correspond to the analog output values 4 and 20 mA. In
normal operation, the transmitter will drive the output in response to volume flow or level
from the lower to upper saturation points.
Note
The 20 mA point should be set below the reduced accuracy zone at the top of the tank.
Reference Manual Configuration parameters
00809-0200-4480 May 2021
Reference Manual 83