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Good Evening all.My question is - For a feed water line to
an equipment if i need to measure the flow we will use
orifice /magnetic/vortex depend on cost/spec.If i need to
measure a ''Alarm''signal and ''Interlock'' from one point
i think we can use orifice type in one location with 2
different tapping points - one for alarm and one for an
interlock to flow valve..If in case i need to have both
these signals(Alarm & interlock) from magnetic flow
meter,is it possible??will 2 seperate sensors will be
located inbuilt r we can program it ??..i thk we can have
one transmitter with these 2 signals...need to know any
technical issues are there?pls clarify
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Answer Posted / carl_ellis
If this is not SIS (safety instrumented), the 4-20mA from a
single flow transmitter can feed a separate I/O modules (4-
20in, relay out) an alarm module and a separate interlock
module.
Or, depending on the converter/transmitter model, most
magmeters have at least one assignable relay output, some
have two relay outputs.
I've always used orifice flange unions that have only one
set of taps. There might be a double tap flange unions, or
I suppose you can drill and weld the pipe for taps. But
again, unless this is SIS, why would you? Decisions made
on a 4-20mA flow signal on a PLC?DCS/Controller/I?O modules
can do multiple functions.
If your situation is SIS, you should state that.
Carl Ellis
Measure First
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Yokogawa CENTUMVP R6.09 unable to download to Engineering Station with ExaOPC R3.75
The issue is when I try to download the common project section to the Engineering Station (STN) from the HIS in System View, it is unable to connect. The error displayed is:
WARNING: Could not connect to equalize destination. (7001)
Retrying. Number of retries = 0/1
ERROR: LdXopsLoadMain: connect error 10060
ERROR: Processing terminated due to connection error. (7002)
Equalization end with errors. STN0149
---- ERROR = 2 WARNING = 1 ----
Background:
>Updated the ExaOPC software on the STN from 3.60 to 3.75
>STN operating system is Windows Server 2008 R2
>HIS operating system is Windows Server 2016 Stanard
Solutions attempted include:
>Ensuring all IP addresses are correct and all networked devices can be pinged.
>The ability to ping a device using its host name from another device (
Q1: Consider part of a control loop, which excludes the transmitter, consisting of a process, a controller and a control valve which may be represented by two dead times of 0.5 min each and three exponential lags of 0.8 min., 1.0 min. and 1.5 min. respectively. We wish to express this system as an overall first order plus dead time (FOPLD) model ie gain, time constant and process dead time. (We will see later that this is often done, to simplify controller tuning). For this exercise, gain is considered to be 1.0. (A) If the transmitter is a flow transmitter whose behaviour can be described by a dead time of 0.2 min. and an exponential lag of 0.5 min. in terms of the overall dead time and overall first order lag how can the system behaviour be approximated ? Overall dead time = Overall time constant = (B) If the transmitter is a temperature transmitter with a temperature sensor in a protecting well whose behaviour can be described by a dead time of 0.7 min. and an exponential lag of 15 min. how can the overall system behaviour be approximated now? Overall dead time = Overall time constant =
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