Answer / rizwan afzal

Suppression.If transmitter is installed in such
configuration that positive pressure is acting on the HP
side even when level in tank is zero. Such as Tx is
installed below datum point then head pressure of impulse
line is always acting on the HP side of the Tx even if tank
is empty, to componsate that head pressure a -ve biasing is
applied which is equal to the head pressure.
IN OTHER WORDS the LRV of Tx is kept at +ve pressure(equal
to head pressure causing error), so that Tx should give 4mA
at that head pressure.


Elevation.If transmitter is installed in such configuration
that positive pressure is acting on the LP side(DP is in -
ve value when level in tank is zero). Such as Tx is
installed in wet leg configuration then head pressure of
wet leg is always acting on the LP side of the Tx (even if
tank is empty), to componsate that head pressure a +ve
biasing is applied.
IN OTHER WORDS the LRV of Tx is kept at -ve pressure(equal
to head pressure causing error), so that Tx should give 4mA
at that head pressure.
Or to keep range in +ve, Tx can be installed in such manner
that LP side is connected with datum point and HP side with
Wet leg.

Answer / ayaz

this term use for only when the transmitter mounting on up level on hp side or low level of hp side 
when transmitter mount above on hp side tapping is called the transmitter is zero elevation 
when transmitter installed below on hp side tapping is called the transmitter is suppression

Answer / r_vaya

Zero suppression: when a static head transmitter is installed below the zero liquid level, the transmitter gets a +ve error in the level measurement. This error is corrected  by a zero suppression method.


Zero elevation: when a static head transmitter is installed above the zero liquid level, the transmitter gets a –ve error in the level measurement. The error is corrected by a zero elevation method.

how to install the Ph and Conductivity analyser? is there are any procedures which has to be maintained.

2 Answers  

---

what is the procedure for auto tune in masoneialn 12300 series displacer type transmitter?

0 Answers  

---

How the flow can be measured by using DP Transmitter?

3 Answers  

---

What is the diffrence between digital signal processing and discrete signal processing?

0 Answers  

---

why we use the ac supply load cell>?can we use the dc supply load cell?advantages and disadvantage of the ac supply load cell?

0 Answers  

---

how to check diode wheather it is working or not by using multimeter?

3 Answers  

---

when an eddy current probe is installed inside of a turbine or compressor in case of probe problem same as:crash of head of probe,changing the scale factor because of low measuring gap(physical gap is ok(example=1.14mm)but voltage is reduced(example=-6 volts),is any way to check the probe,when the ohm of probe is ok.thank you,(Karim Tavakoli)

1 Answers  

---

how flame detectors sense the flame.

3 Answers  

---

IS IT POSSIBLE TO CALIBRATE A LEVEL TRANSMITTER INDICATOR(ABB) USING HART COMMUNICATOR.? I MEAN TO CHANGE FROM ONE UNIT TO ANOTHER WITHIN INDICATOR (EG. INCH TO FEET)...? PLZ NOTE THAT I HAVE MADE THE UNIT CHANGE IN TRANSMITTER USING HART COMMUNICATOR..BUT WHAT ABOUT THE INDICATOR..?

2 Answers  

---

What are the processes Variables?

4 Answers  

---

please send me the inteview questions in IOCL

0 Answers   IOCL,

---

in mass flow meter what is drive friquancy ?

0 Answers  

---