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 many types of viberation transmitter and how to calibrate and where use of vibration transmitter

0 Answers   Sabic,

---

What is difference of fanuc alpha series 16i and 18i controller.also what is differnce betn TC and MC controller

0 Answers  

---

what is the relation between flow and pressure.for example relationship between level and pressure is p = phg like that i want ans for this question.and also how to calculate orifice sizing and flow transmitter. pls some one ans for this questions.

3 Answers   Orchid, SRF,

---

while am calibrating Drager polytron 2IR flame gas detector occured non zero status.how can i get zero status?

0 Answers   Gasco,

---

please any body have most important data for study for saudi aramco test of instrument QC thanks email shahnaveedullah@gmail.com

0 Answers  

---

---

what is ZERO SUPPRESION and ZERO ELEVATION?

3 Answers   Reliance,

---

Why we use 4 to 20 mA, (This is International Standard) instaed of this can we use 4-16, or 4-24 or 3- 15 or any other range

13 Answers   ONGC,

---

Lux meter is the measuring device to measure the lux level of lighting fixture. in industrial sector two types of lighting fixture is being used as street lighting purpose 1. HPSV (Sodium) and 2. HPMV (Mercury). HPMV having white light which is an combination of red, blue and yellow colour, while HPSV haivng Yellow lighting. in HPSV red & blue colour will be absent. during measurement of the lux level of HPSV and HPMV fixture. 1. Lux meter can measure the actual lux level of both fixture? 2. or it will show false reading for HPSV fixture light as it has only yellow light present. please give me answer

0 Answers   Ace Info,

---

how can loop single 4-20 ma to two isolation amplifier? i mean i have two isolation amplifier with 4-20 ma input and 1-5 v output.can i done series connection ?

1 Answers  

---

The process variables that need to monitored and controlled are ________, ________, _________ and

1 Answers  

---

how to calculate MMWC values in to Tonns(MMWC values showing in DP transmitter and Tonns value showing in Totalizer). please tell me details?

2 Answers   Chemin C I, MSP,

---

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

1 Answers  

---