Yokogawa RotaMASS 3-Series - Manual (Page 173)

7. pArAMETEr dESCrIpTION
7-101 IM 01R04B04-00E-E 8th edition March 01, 2011 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
7.21 Empty pipe detection (detailed Setup)
Empty pipe detection
Not available if gas measurement
(option /GA) is ordered
Detection of empty pipe
After Empty pipe crit has been reached, alarm
output is activated if selected.
This function can also be used to detect tube failure
(see chapter 8.8).
Empty pipe alm sel Select: Not apply, Apply
Empty pipe crit Set density value as criteria when empty pipe alarm
should happen. If
Empty pipe crit is smaller than
density Urv (or LRV, whichever is higher), alarm
appears if density is lower than
Empty pipe crit.
If Empty pipe crit is equal or greater than density
Urv (or LRV, whichever is higher), alarm appears if
density is higher than
Empty pipe crit.
After empty pipe Select the behaviour of the outputs after empty pipe
has happened.
Select: Massflow = Zero, Measured value, Hold
With this function the outputs can be set to zero if the
detector runs empty during maintenance. It is also
useful for batching if the batch starts with an empty
pipe. In such case please install the detector vertically.
Gas application?
Yes No
Empty pipe alm sel = Apply?
Yes No
Empty pipe crit < Density URV?
(or LRV, whichever is higher)
Empty pipe crit ≥ Density URV?
(or LRV, whichever is higher)
Yes No Yes No
Empty pipe OFF
Alarm off
Empty pipe
ON
Alarm On
if density <
empty pipe crit
Outputs either
Measured
Value, Hold or
4mA/0Hz
Empty pipe
OFF
Alarm off
Empty pipe
ON
Alarm On
if density ≥
empty pipe crit
Outputs either
Measured
Value, Hold or
4mA/0Hz
Empty pipe
OFF
Alarm off
Empty pipe
OFF
Alarm off