MU300 Rev1.0 Oct20
Page 26 of 54
Cut zero point
M22 menu-Cut-1. Yes, it displays “success” if zero point is cut. and the flowmeter would return
to M01 menu.
Reset zero point
M22 menu--Reset-1. Yes
6.1.4
Meter Coefficient
Meter coefficient indicates the specific value of actual flow and the display value of the
flowmeter. For example, the actual flow at the measurement point is 3 and the flowmeter
displays 2.99, then the meter coefficient is 3/2.99. Under perfect measurement status, the
optimum meter coefficient is "1". However, it’s hard to make all flowmeters have the same
coefficient in batch production and also because of the changeable environment on site, it’s
impossible to ensure the meter coefficient of all flowmeters is "1".
Therefore, each flowmeter would be calibrated before leaving factory to get its meter coefficient,
which is called K coefficient.
You also could calibrate the flowmeter in service on site through M26 menu.
6.1.5
System Protection
System protection is mainly to avoid abnormal operation of flowmeter in installation or
operation because of touching by mistake. When system protection is enabled, you could view
the flowmeter but can’t correct any parameters.
You could enable or disable this function in M54 menu. You need to enter passcode to activate
the function or make alterations.
6.1.6
Current Loop Output
The current loop output accuracy is 0.1%. It is programmable and you can set several output
modes like 4~20mA and 0~20mA in M23 menu.
In M32 menu, 4mA/20mA is the minimum/maximum limit value. For example, the flow range in
a pipe is 0~1000m3/h, you only need to input 0 and 1,000 respectively in M32 menu. If the flow
range is -1,000 ~ 0 ~ 2,000m3/h, and 20 ~ 4 ~ 20mA output is used while not considering the flow
direction, you could set 1000 and 2000 as the minimum and maximum limit values respectively
in M32 menu.
