Answer / carl_ellis

Any 2 wire, loop powered 4-20mA transmitter that puts out
30mA is broken. The only transmitter that puts out 30mA is
a legacy 10-50mA transmitter from 20-30 years ago.

While the upper end of the 4-20mA signal range is 20.0mA,
most 2 wire, loop powered transmitters allow for some slight
signal over-range, typically 20.5mA.

NAMUR standards use 21.0 mA to signal a fault or failure
mode. Other vendors use other values, 20.8mA, 21.2mA or
some value in the range of 21mA. But no vendor uses 30mA
as a fault mode.

The transmitter is broken or dysfunctional.

Carl Ellis
Measure First

how bolometer is used in temperature measurement ??

1 Answers  

---

What FLOW METER generally used in Gas plant?

5 Answers   Gasco,

---

why twisted pair of wires is used in instrumentation ?

6 Answers   ONGC,

---

WHAT IS THE MAIN WORKING OF BOILER.

3 Answers  

---

whats diffeence between dcs & scada operation.

3 Answers   Orchid, Reliance,

---

what is the meaning of potential free contact. difference between dry and wet contact?

6 Answers   GAIL,

---

A RANGE OF TRANSMITTER IS (0-400)B mm abs what is "B"?

1 Answers   HCL,

---

Hi buddies! i am facing a problem and if someone could help me it will be an immense pleasure to me. we have compect logix PLC 1769 2L AO module to Heat @ 52 to 56 Deg C .So if anyone can do please help me out with this problem.I'll be highly grateful.

1 Answers   Cadila,

---

What is CNC

1 Answers  

---

how the transmitter send MA?

1 Answers  

---

how manys ways dp transmitter can be calibrated having range of -150 to 400mmwc,what side pressure u will apply?

3 Answers  

---

please send me gail format if u have... please help me if u can...

1 Answers  

---