Answer Posted / sabry

If the impulse line connected to the low side of the differential pressure instrument is filled with a suitable fluid, it's called (wet leg).

If the impulse line is empty, it's called (dry leg).

Dry leg & Wet leg is a technique used in differential pressure measuremnt for 2 main reasons:

1 - We use (wet leg) to prevent the dangerous fluid from harming the sensitive instrument.

2 - In closed tank application, we use (wet leg) to prevent vapour condenstion due to temperature variation, so we get a stable/accurate measurement.

Good Luck

Ahmed Sabry
I&C Senior Engineer
Cell:+2 (0122) 1367310

hye SAM acn u send your e mail id, so that i can solve my query through e mail?

1818

---

hi i am eswar i want to know the instrumentation interview questations for eil(engineers india ltd) i have applied for engineer post in eil please help in this.my mail id eswar310@gmail.com

2103

---

what is installation and commissioning of (fat & sat) of power plant dcs ? this question keeps in desirable conditions of one company .

4410

---

when the instrument tapping on pipe line is located below and transmitter is located above the tapping point for liquid service transmitter, what should we do, is there any additional drain valve is required??

1719

---

TECHNICAL/ARTITUDE

1726

---

---

How will you test a transistor with a multimeter?

636

---

A flange is used for instrument connection for a system with a design temperature of 316C (600F) and a design pressure of 1000 kPa (145 psi). What is the class rating of the flange to be used for this application? Explain your answer

1885

---

what is the difference between Cv and air consumption? why the customer needs Air consumption details?

1527

---

why is not useing in boiler skin thermocople

4551

---

How signals can be taken through modbus?

692

---

what should he know if he is an assitent engineer instrumentation in cement industries of experience of 10 - 15 year.

1630

---

what is difference between fork type and capacitance type level switch. where it is using

1935

---

Yokogawa CENTUMVP R6.09 unable to download to Engineering Station with ExaOPC R3.75 The issue is when I try to download the common project section to the Engineering Station (STN) from the HIS in System View, it is unable to connect. The error displayed is: WARNING: Could not connect to equalize destination. (7001) Retrying. Number of retries = 0/1 ERROR: LdXopsLoadMain: connect error 10060 ERROR: Processing terminated due to connection error. (7002) Equalization end with errors. STN0149 ---- ERROR = 2 WARNING = 1 ---- Background: >Updated the ExaOPC software on the STN from 3.60 to 3.75 >STN operating system is Windows Server 2008 R2 >HIS operating system is Windows Server 2016 Stanard Solutions attempted include: >Ensuring all IP addresses are correct and all networked devices can be pinged. >The ability to ping a device using its host name from another device ( from HIS) >Ensure both devices firewalls are disabled. >The antivirus installed on the STN is disabled. >Ensuring both devices are within the same workgroup. >Added both devices to each other's Host and LMHost files. >Running IT Security tool after changing any administrative settings.

1640

---

How to decrease opening & closing time of on/off valve?

975

---

Where is wet leg is used?

643

---