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 can you convert an SR Flip-flop to a JK Flip-flop?

1 Answers  

---

I have a problem with a valve (air to close). When it is fully closed and try to open 1% it doesn't responce till 3% open suddenly more than 3% then back to 3%. I tried to tune positioner then removed it, the problem still exist. Any idea

3 Answers  

---

What is the difference between ff transmitter and non ff transmitter

0 Answers   Samsung,

---

How to convert 4 wire level transmitter connection to 2 wire.

2 Answers  

---

Boiler flame scanner working principle?

1 Answers   Bhel,

---

which is type of thermocouple is used to measure 1000deg?

9 Answers  

---

How many mode are in ups?

2 Answers  

---

what different types of problems do occur while doing instrumentation commisioning and how to solve them? please explain in detail

0 Answers   Process Control Technologies,

---

please send me some question papers of HPCL aptitude test ?? please send it to bipinb.28@gmail.com ...

0 Answers   HPCL,

---

why we are using 4-20ma why cant we use 4-40ma

3 Answers  

---

Why the ammonia and Nitric Acid level indicators is with millimeter ? and What is the conversion form millimeters that level indicator indicate to weight ?

0 Answers   EHC,

---

what is the difference between venturi and orifice meters?

9 Answers   Medha Servo Drives,

---