LRF-3000P Ultrasonic flowmeter
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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.