ST100 Series Flow Meter
TROUBLESHOOTING
Fluid Components International LLC
37
When NAMUR is enabled, and a Fatal Fault is detected, the 4-20 mA output is forced to the preselected NAMUR output level. Use the
Click
to Test NAMUR
button (forces NAMUR output) as needed to verify the system setup and wiring.
FAULT BIT
FATAL FAULT ERROR OR STATUS DESCRIPTIONS
1
CORE: any of these errors: I2C error, UART error, Mutex error or Watchdog Reset.
4
CORE: unable to update process data (PD_NO_FE_DATA). Unable to obtain/use data from any active FEs.
6
CORE: detects FRAM/SPI error.
14
CORE: unable to communicate with one or more Fes (PD_COMM_ERROR).
16
CORE: averaged flow out of range of “Flow Min” or “Flow Max.”
20
CORE: averaged temperature above “Temperature Max.”
21
CORE: averaged temperature above “Temperature Min.”
22
(Any) FE reports SENSOR_HEATER_1_SHORTED_FAULT.
23
(Any) FE reports SENSOR_HEATER_2_SHORTED_FAULT.
24
(Any) FE reports SENSOR_HEATER_1_OPEN_FAULT.
25
(Any) FE reports SENSOR_HEATER_2_OPEN_FAULT.
33
(Any) FE reports AD5754_DAC_FAULT.
37
(Any) FE reports HTRS_FAULTS_ADC_FAULT.
Fatal Faults that Trigger NAMUR
Application Verification
Equipment Needed
• ST100 Calibration certificate
• dR certificate supplied with the flow meter
Check Serial Numbers
Verify that the serial number of the flow element and the flow transmitter electronics are the same. The flow element and the flow transmitter
are a matched set and cannot be operated independently of each other.
Check the Instrument Installation
Review the correct mechanical and electrical installation. Verify that the flow element is mounted at least 20 diameters downstream and 10
diameters upstream from any bends or interference in the process pipe or duct.
Check for Moisture
Check for moisture on the flow transmitter. Moisture on the flow transmitter may cause intermittent operation. Check for moisture on the flow
element. If a component of the process media is near its saturation temperature it may condense on the flow element. Place the flow element
where the process media is well above the saturation temperature of any of the process gases.
Check Application Design Requirements
Application design problems may occur with first time application instruments, although the design can also be checked on instruments that
have been in operation for some time. If the application design does not match field conditions, errors occur.
Review the application design with plant operation personnel and plant engineers. Ensure that plant equipment such as pressure and tem-
perature instruments conform to the actual conditions. Verify operating temperature, operating pressure, line size, and gas medium.
