Yokogawa RotaMASS 3-Series - Manual (Page 155)

7. pArAMETEr dESCrIpTION
7-83 IM 01R04B04-00E-E 8th edition March 01, 2011 -00 All Rights Reserved. Copyright © 2003, Rota Yokogawa
7.5 Mass flow functions (Basic or detailed Setup)
Mass flow To set the functions of mass flow measurement.
Mass flow unit Select: g/s, g/min, g/h, kg/s, kg/min, kg/h, kg/d, t/min, t/h, t/d, lb/s,
lb/min, lb/h, lb/d
Mass flow format Select: xxxxxxx,xxxxx.X, xxxx.XX, xxx.XXX, xx.XXXX, x.XXXXX
Mass flow lrv
(low range value) Set a mass flow value to the 4 mA or 0 Hz. LRV can also be negative to
measure reverse flow.
Mass flow Urv
(upper range value) Set a mass flow value to the 20 mA or xxxxxHz.
Abs(URV-LRV) ≥ 5% of Qnom for liquids (1% for gases)
Mass flow damping Set the damping time in s. Damping time affects outputs and display.
After 5 times damping time the given value is displayed (t=63%).
Mass flow lowcut Set the low cut. Low cut affects outputs and display and applies to
negative and positive flow. A hysteresis of 0.05% of Qnom is given by
the system.
Mass flow alm 1 sel Select: No function, More than, less than
Mass flow alm 1 crit Select a mass flow alarm level. What happens in case of an alarm has
to be defined in Status out (7.12, 7.13).
Mass flow alm 2 sel Select: No function, More than, less than
Mass flow alm 2 sel
Restrictions:
All alarms have to be in 0-110%
of URV-LRV.
Alarm criteria 2 must always be
larger than alarm criteria 1. Select a mass flow alarm level. What happens in case of an alarm has
to be defined in Status out (7.12, 7.13).
Mass flow fix val sel Select: Inhibit, Enable
Mass flow fixed value Select a fix Mass flow value (only for test purpose or in case of
maintenance).
The set value is added to the actual value. In case of no flow it will vary
with the zero fluctuation.