Yokogawa RAMC - Manual (Page 59)

<7. HART-COMMUNICATION>
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IM 01R01B02-00E-E 10th edition January 01, 2013 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
Device setup
Diag/Service
Diagnostics
Flow URV log
Flow URV log ON/OFF Activate or deactivate Flow URV
Logging function
URV overrun time Days/Hours Time since…
Minutes … exceeding URV
URV underrun time Days/Hours Time since…
Minutes … fall below URV
Min overrun time Selection of hysteresis time
Clear values Clears the values in URV overrun time and URV
underrun time
Description of Flow URV logging function :
The flow value is supervised constantly. As soon as the value reaches the upper limit value (103%; 20.5mA)
(event 1), the time is measured, during the flow value is over the limit value. If this error condition remains actively
longer than the hysteresis value, the limiting value recognition is activated and the condition stored. As soon as
the flow value falls below the limit value, the supervision (event 2) ends, for a new cycle the hysteresis time must
pass.
After the recognition you can request the passed time:
Time from event1 till query time: delta-T1
Time from event2 till query time: delta-T2
The time difference is the time the upper limit was exceeded.
hysteresis <= t <= (delta-t1 - delta-t2)
The stored values remain unchanged after power off and must be cleared by the user. The actual cycle is overwrit-
ten automatically by a new one. Therefore only the last cycle is always stored.
The default value for hysteresis is 30 seconds.
-30
-20
-10
0
10
20
30
40
50
60
70
80
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
Temperature
delta-T1 (day; h; min)
Reset to actual value
- on Clear MAX valu e
Read out
- delta-T1
- MAX Value
- Status
MAX Temp. = 70 °C
t1
Time [h]
Tem
per
at
ur
e
[°C]
Temperature MAX function