Question { Essar, 14651 }

HOW DPT WORKS?

Answer

DPT is give the output of difference of the HP and LP.
Process line Upstream side is connected to the HP side(P2)
of the transmitter. Downstream side is connected to the LP
side(P1) of the transmitter. Output will come like this
(P2-P1). Q = k (Root of Delta P). Delta P = P2-P1.k =
constant.

Onemore type is there. Diapharm type it is also working as
well as DPT. But Silicon oil is filledup the inside of the
cabbilary. This oil will push the diapharm of the
transmitter, then resistance value will change,
corresponding to the input pressure.Corresponding the mA
will converted by transmitter.

Question { Nestle, 24195 }

what is the principal of flow transmeter,level trans
meter,presser transmeter?

Answer

1. Differendial pressure method is using in flow TX. Ex:
Q = k * Delta P,Delta p = (p2-p1),K- Constant (we can take
1), Q- Discharge perssure, p2- Inlet Pressure, p1- Outlet
pressure.

2. Level also like same principle, We can use Differential
pressure TX, that is according to the tank model (Closed
tank or open tank).

Question { 46619 }

what is mean by loop checking?

Answer

Loop Checking means, First we want to check the continuity
of cable. Then whether 24 V DC or 4 - 20 mA DC is coming
from DCS or JB want to check. That is called loop Checking.

Question { 8889 }

what is the full formof HART

Answer

Highway Addressable Remote Transducer