Answer / carl_ellis

Something is wrong with the stated situation. The stated range is in -0.5 to 2.0 bara, where bar is bar absolute.

An absolute pressure references absolute zero (a hard vacuum).

No measurement can be made below zero bar absolute because it violates the laws of physics.

While a DP transmitter can not make a negative absolute measurement, it can make a negative differential measurement where the low side pressure is higher than the high side pressure.

The method of changing the differential range depends on the brand/model of the transmitter.
- zero and span adjusting pots
- zero and span push buttons
- local indicator/push buttons
- HART communicator/modem-software

The first two require an applied reference pressure for zero and span.

The 3rd and 4th options might have a choice of applied pressure or entering values for zero and span.

Some DP transmitters do not have the same accuracy in the negative range as they do in the positive range.

Carl Ellis
Measure First

Answer / manikandan

Using hart

what is difference b/w Earth and ground

2 Answers   PPL,

---

What is a flow meter?

2 Answers  

---

i want to calibrate a transmitter in the range of -100 to 300 mmwc. How it is possible to measure -100 to 300?.

2 Answers   Hindalco,

---

i want to control the temp of sand(welding flux) between the range of 150deg C to 170deg C. sugges me sum temp control method without PID controller.

1 Answers  

---

Yokogawa dcs normally where will change 4-20 MA to DC voltage( node or I/o cards?)

1 Answers  

---

how to online calibration of remote seal tx.

0 Answers  

---

An RTD is a_________________________.it works as follows

2 Answers  

---

what is the difference between CPC and i/p converter

1 Answers   Siemens,

---

Somebody tell me in what way i need to prepare for csio pgrpe(adv instrum eng)interview?what all the quest can i expect?

0 Answers  

---

which types of oxygen analyzer describe with drawing ?

2 Answers  

---

Explain why use mmwc unit?

0 Answers  

---

why we are using boosters at glass furnace is there any other thing?

1 Answers   CGL,

---