Answer / carl_ellis

A magmeter cleaning unit can be used for applications where
deposits accumulate on the liner material and electrodes.
Non-conductive deposits will reduce the electrode signal,
while conductive deposits will partially shortcircuit the
electrode signal, in both cases deteriorating the accuracy
of the meter (depending on the character and thickness of
the deposits).

The cleaning unit is used for electrochemical cleaning of
the sensor (electrodes) by applying voltage for approx. 60
seconds. Metering is resumed after another 60 seconds when
cleaning is complete.
During cleaning (120 seconds) the transmitter/converter
typically maintains the last flow reading in the display and
in the signal outputs until metering is resumed.

AC cleaning is used to remove fatty deposits from the
electrodes. These fatty deposits are seen in waste water
applications, in abattoirs and water applications with oil
residuals. During the cleaning process, the surface of the
electrodes get warmer, which tends to soften grease
particles and the gas bubbles generated mechanically lift
deposits away from the surface of the electrodes.

DC cleaning is used to eliminate electrically conductive
deposits in the measuring pipe influencing the
measuring accuracy. Particularly in district heating
applications an electrically conductive deposit (magnetite)
may occur and short-circuit the electrode signal. In this
case the accuracy of the meter decreases and the
signal/noise conditions of the meter become inferior. The
problem only arises if the conductivity of the water is less
than approx. 250 μS/cm. During DC cleaning electrolysis
takes place where the flow of electrons removes the particle
deposits from the electrode area.

Setup parameters determine the frequency of a cleaning process.

It is mandatory that liquid fills the pipe during the
cleaning process. The “empty pipe detection” should be used
to detect when the cleaning process should be interlocked.

Carl Ellis
Measure First

Answer / er.jdsavaliya

-

what does mean by analog output trim and where this one used for?

1 Answers  

---

To calculate temperature, why we multiply 25 with mV?

2 Answers  

---

What is the maximum operative of Drive ?

2 Answers   Reddy Labs,

---

What do you do as a Engineering person EPC for Sizing&Selecting Control Valve?

1 Answers  

---

why the output sugnal is 4-20 ma and not 4-25 ma?

5 Answers  

---

What is the expansion of RADAR? How it works?

7 Answers   RasGas,

---

need instrumentation job completed 1 year trainee ship in mnc pesticide company. now in search of job

0 Answers  

---

Boiler flame scanner advantage?

0 Answers   Fluke, Petrochemicals, Tata Chemicals,

---

how many type of plug are used in pneumatic control valve,name them.

2 Answers   Godrej,

---

how we convert Mili ampere to temp txt,level txt,flow txt,pressure txt range value

4 Answers   Saadi Cement,

---

TRANSDUSER MOSTLY CONVERT WHICH ENERGY INTO ENERGY ?

6 Answers   DVC,

---

How to connect another 24 volt dc power supply in circuit when previous power supply has become weak.what is the connection?

2 Answers   Bhole Baba Dairy Industries,

---