Answer / rampal.m.

Power supply is 24vdc this can be load wear upto 600 ohm minimum operating voltage 10.5vdc for load 250 ohm (abb tx) so minus the load 600-250 =450 ohm from graph.
Now inst cable copper conductor has resistance per km approx= 25 ohm/km then divided 450/25=18km.
Answer=18km .

Answer / praful

depending upon the cable size and its resistance we can calculate the max. cable length. e.g. if 1 sq.mm copper cable is used then its resist. is 33ohm/km and operating voltage is 24v then its voltage drop for 1km is 17v.so if instrument operating supply is less than the drop voltage i.e (24-17) then we can use upto 1 km otherwise reduce the length as per opr. voltage.

What is the difference in clamp on type and inline type ultrasonic flow transmitter.

1 Answers  

---

what are the documentation and instrument identification system used to identify the correct device to be calibrated? name atleast three.

1 Answers  

---

rtd principle?thermocouple principle?

5 Answers  

---

why t/c is connected parallel and what is the purpose of it

2 Answers  

---

We are used ABB 800xa 5.1.please tell me how to instrall this.

1 Answers   TCCL,

---

Give 2 application of quartz crystal used for process parameter measurement.

1 Answers   ADMA OPCO,

---

which type of zones used for boiler? & why ?

0 Answers  

---

what does the ratio 800-400-300-200/1-1-1-1-1 in the specification of current transformer indicates?

0 Answers  

---

why we use impulse line of flow transmitter at 45 deg. angle both side of orifice plate.

0 Answers  

---

how we can calibrate level transmiiter in field?

6 Answers  

---

how to connect the HART protocal with control valves

1 Answers  

---

Hi, I'd like to know the purpose of MOS (maintenance override switch). At site, these switches are installed in a stanchion with the transmitter (connected to ESD). thank you.

3 Answers   Adani, Adani Wilmar,

---