Answer / carl_ellis

how to calculate flow range in DP tx

A flow range is calculated for a primary flow element
according to design flow conditions. The result of the
calculation is a maximum flow rate at a given DP span.

The DP transmitter does not 'calculate flow'. The DP
transmitter is spanned to the value in the calculation.
The DP transmitter can extract the square root from the
normalized percentage of the DP. That square root value
can be assigned flow rate values in fieldbus transmitters.
Or the square root value can be assigned flow rate values by
the local indicator on the DP transmitter. But the square
root 4-20mA output is just a signal representing the span of
the flow rate. Flow rate values are assigned by scaling in
the receiver.

Carl Ellis
Measure First

how can we measure the pressure in underground cooling water pipeline by using pressure transmitter?what about the tapping position?

2 Answers  

---

which is the best type to measure level of a Tank(water). Displacer or Differential Pressure method?

2 Answers  

---

What is Cryogenic?

2 Answers  

---

What is the differerence between hysterisis and linearity.

0 Answers   CCIE,

---

if my 6 kva UPS gives 20 min. backup at 100 % load, then at 25% load what is the backup time?

17 Answers  

---

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

3 Answers  

---

cheapest instru-- PMMC, EDM, rectifier, thermocouple.

3 Answers   ONGC,

---

How Many Slave Can be used in one slave ?

2 Answers  

---

any thing about plcs?

4 Answers  

---

Why ues 250 ohms Resistor during hart type instruments calibration with hart protocol in details ?

5 Answers  

---

what do u mean by compensation n pid tunning?in pid tunning what you tunned?is it possible 2 tune p i d

2 Answers  

---

what is the basic principal of vertax flow meter

3 Answers   Balrampur Chini Mill, Saba,

---