Answer / satorp

For a general installation connected to DCS, reading at DCS
will overanged > 100%. If there is Barrier installed it
will limit energy to field therefore no potential for
ignition spark at SC area.

Answer / carl_ellis

Part I.
Let's assume the question involves a 2 wire, loop powered
transmitter powered by a 24Vdc power supply in series with
the transmitter and a load resistor across the analog input
of the receiver device.

The loop current is nominally 4-20mA.
The power supply negative is wired to the analog input
negative.
The short puts a positive 24Vdc on the (+) side of the
analog input.

The load resistor for the analog input is across the (+)
and (-) terminals, so the resistor now 'sees' 24Vdc across
its 250 ohms.

Part II. extra credit. Calculate the wattage spec needed
for a 250 ohm resistor to survive the short circuit in the
2 wire, loop powered cable.

Carl Ellis
Measure First

what is cascade system ?

1 Answers   RSP, Thermax,

---

what is instrumentation?

8 Answers  

---

what is difference between Floating D.C.Voltage and Fixed D.C.Voltage?

2 Answers  

---

what is the calibration procedure for magnetic flow meter @ onsite

0 Answers  

---

differentiate different units of pressure like US & UK standards

1 Answers  

---

---

What is output of Thermocouple at 25 deg c

10 Answers   TATA,

---

warning lamp does not light, but it does light when the wire from the lamp going to the sending unit is grounded (the part that plugs into the sending unit) what does this indicate)?

1 Answers  

---

what is type of protocol used in instrument field to marshalling cabinet cabel. what is the differenance between bus cabel and instrument cabel?

1 Answers   Samsung,

---

what is purpose of three way manifold valve using for dp transmitter

1 Answers  

---

What is instrumentation instrumentation engineering?

0 Answers  

---

What is the difference between PLC and DDC?

0 Answers   Emami,

---

what is proportional & what is proportional band

1 Answers   Nimir,

---