BIFFI IMVS2000v2 - Graphs - Sampling Time - Memory

Installation, Operation and Maintenance Manual
September 2019
MAN720_IMVS2000v2_IOM Rev. 6
Section 5: Working Principle
Working Principle
The CAL alarm is always associated to the Common Failure Alarm Status and cannot be disabled.
The POS alarm cannot be set to “No."
The PST Alarms, when enabled, are always associated to the PST Status.
The cyclically checked alarms set as “No” are disabled at the next check instant.
If the PST Alarms and the FST Alarms are disabled, the setting has effect on the further PST and FST.
See Section 6 and Section 8 for details about alarms.
5.2.8 Graphs – Sampling Time – Memory
The IMVS2000v2 can store as graphs the following events:
- Opening FST
- Closing FST
- PST
- SOV Test
Each graph is composed by 351(#) samples for the following data:
• Time (seconds)
• Pressure 1 (bar or psi) – pressure sensor S1 (*)
• Pressure 2 (bar or psi) – pressure sensor S2 (**)
• Process pressure (bar or psi) – pressure sensor S3 (***)
• Position (%)
• |Pr. 1 – Pr. 2| - absolute value of the difference between Pressure 1 and Pressure 2 (**).
(#): the “Digital Input FST Graphs” and “External Source FST Graphs” can have less than 351 samples
(see Sections 5.2.8.1 and 5.2.8.2 for details).
(*): if the pressure sensor 1 is enabled
(**): if the pressure sensor 2 is present and enabled.
(***): if the process pressure sensor is present and enabled.
The samples period is a multiple of 5ms.
The time length of each graph is a multiple of 1.75 seconds.
The time length of each graph is automatically calculated by the IMVS2000v2.
The time length of the Opening FST is determined by the parameter Opening Maximum Time that is
automatically set equal to the Opening Calculated Time (see Section 6 for details).
The time length of the Closing FST is determined by the parameter Closing Maximum Time that is
automatically set equal to the Closing Calculated Time (see Section 6 for details).
The time length of the PST is determined by the parameter PST Maximum Time that is automatically
set equal to the PST Calculated Time (see Section 6 for details).
The time length of the SOV Test is automatically calculated by the IMVS2000v2 during the Baseline
Signature and it can’t be modified.
If the Opening Maximum Time or the Closing Maximum Time or the PST Maximum Time are
manually set (only for expert users), the value is automatically rounded up to the nearest multiple of
1.75 seconds.
The IMVS2000v2 can store up to:
- 50 FST Graphs (2 are dedicated to the Baseline Signature)
- 50 PST or SOV TEST Graphs (1 is dedicated to the Baseline PST or Baseline SOV Test)
The graphs are stored in a non-volatile memory.
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