Reference Manual
Table Of Contents
- Rosemount 1408H Level Transmitter
- Contents
- 1 Introduction
- 2 Transmitter overview
- 3 Mechanical installation
- 3.1 Safety messages
- 3.2 Installation considerations
- 3.3 Mounting preparations
- 3.4 Mount transmitter on tank
- 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 General power supply fault – Check availability
- 7.2.3 Device software fault – Check firmware revision
- 7.2.4 Parameter error – Check data sheet and values
- 7.2.5 Short circuit – Check installation
- 7.2.6 Device memory failure – Restore default settings
- 7.2.7 Level measurement lost – Check application
- 7.2.8 Simulation active – Check operational mode
- 7.2.9 Device temperature over-run – Clear source of heat
- 7.2.10 Device temperature under-run – Insulate device
- 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
- 7.3 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
Alarm set points
SP1 - High alarm set point
If the measured level is above this set point, the digital output is set to alarm state.
SP2 - Low alarm set point
If the measured level 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.
Alarm delays
Alarm on delay
The time delay for when the digital output transfers from normal to alarm state.
Alarm off delay
The time delay for when the digital output transfers from alarm state to normal.
Figure C-6: Example - High Alarm with Alarm Delays
A
B
C
E F
D
Of
f
On
A. Level
B. Time
C.
SP1 - High alarm set point
D. SP1 - Hysteresis high alarm
E. Alarm on delay
F. Alarm off delay
Reference Manual Configuration parameters
00809-0100-4480 September 2020
Reference Manual 89