Answer / carl_ellis

A Thermal Instrument was flow calibrated at the factory for a certain specified medium/fluid. If their flow meters can be recalibrated in the field for fluids other than the one specified at time of manufacture, the calibration instructions are not posted on the web site.

Their web site does have a fairly long and involved calibration check for landfill gas application (methane generated in garbage dumps/landfills) under the FAQ: What is your procedure on checking the calibration of a landfill gas meter in the field? It involves on-site multiple pitot flow measurements in a traversing pattern to get a flow average, calculating m molecular weight of the gas mixture, calculating density from the ideal gas law, and then converting to velocity and finally calculating mass flow with the tube's cross sectional area. Simple, huh?

The analog output of the transmitter, the zero at 4.00mA and the span at 20.00mA, can be adjusted with a field calibration check and adjusted as necessary.

Typically, the flow rate can only be calibrated on a certified flow stand or flow cell; field calibration is not practical. Return to the factory is typical.



Carl Ellis Measure First

why do 4 mA serves as 0% not 0 mA?

10 Answers  

---

what is ment by PID controllers? explain with example?

2 Answers  

---

Hi, I'd like to know the purpose of MOS (maintenance override switch). At site, these switches are installed in a stanchion with the transmitter (connected to ESD). thank you.

3 Answers   Adani, Adani Wilmar,

---

draw the characteristics of chebyshev filter

0 Answers  

---

Capacitance, resistance ( colour coding ), parallel & series circuits.

0 Answers   CCIE,

---

why we use 0.2 to 1.0 kg/cm2 output in control valve

4 Answers   GNFC,

---

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 (<ping STN0149> 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.

0 Answers  

---

can any one help me to get bel probational engineers sample question papers. I have applied for it.

0 Answers  

---

State 5 different method of level measurements.

3 Answers   SRACO,

---

what is the difference between active and passive loop ?

8 Answers  

---

how to tune the closed pid loop?

3 Answers  

---

What is the working principle of the magnetic meter?

0 Answers  

---