Answer / sam

You can install the PT anywhere on the pipe. It is best to
install on top in crude and slurry application but to
measure water you can install any where, even under the pipe.
If you install on the side or under the pipe fill the
impulse line with water then do a zero on the PT before you
do the final span calibration. Also remember that the
calibration you do on the PT must be exactly the same as to
what your DCS or SCADA faceplate have been scaled to. In
other words if you calibrate the PT for 0 to 20Bar you must
make sure the faceplate in the CCR are also scaled to 0 to
20bar.
Good luck

Answer / carl_ellis

If the transmitter is not directly mounted on the
underground pipe, which is not unusual unless there is
vault access, then an impulse tube/pipe has to come up out
of the ground. The pressure measurement will be in error,
low, by the difference in elevation between the pipe's
elevation and the pressure transmitter's elevation.

Suppose the pipe is 2.1m below the grade level and the
pressure transmitter is 1.6m above grade. The elevation
difference is 3.7m.

The measurement is 3.7m or 0.362 bar low.

It is not unusual to have water supplied at pressure
between at 4-8 bar. At 4 bar pressure, an error of 0.36m
water column is a 9% error, a vary large value for an
insturment capable of 0.25% or better accuracy.

The commissioning of the unit should include the
appropriate zero correction to compensate for such a large
error.

Carl Ellis, Measure First

I have a close vessel tank which is under vaccum when in running condition so pl. Provide it's range for dp type tx whose flange to flange distance is 440 mm and density is 1

1 Answers  

---

thermocouple output is AC OR DC??

17 Answers  

---

what does the ratio 800-400-300-200/1-1-1-1-1 in the specification of current transformer indicates?

0 Answers  

---

why the supply frequency used in America is 60Hz while that used in India is 50Hz?,

2 Answers   Bosch, Genco,

---

how to calculate range of Dp transmitter

1 Answers  

---

Functions of electropneumatic valve positioner:

4 Answers  

---

please someone tell me what is function of vibration sencer and how many types and how to control viberation.please. my id is jimmykhan077@gmail.com

0 Answers  

---

i want to know for good instrument engineer or success how many software knowledage required & from which university

0 Answers  

---

Tyes of interface level measurement and how to use that technique for interface level measurement,

0 Answers  

---

I have 0.75mm sq multicore cable (IS type) , can use instead of same type but 1.5 sq mm cable ? Note : The distance is around about 150 meter.

0 Answers  

---

Explain plc level and its type?

0 Answers  

---

On liquid service if PT Head is 18 meters. How much pressure will be exerted on it. If Transmitter is not in service?

1 Answers  

---