Product Manual

Wall Mounted Ultrasonic Flowmeter---User Manual
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Set two thermostats, one is set at 50±0.05!, and the other is set at 84.5±0.05!, then follow the
steps as below:
(1) Immerge two pieces of PT100 resistors into 50±0.05! thermostat
(2) Enter
, input hardware debug password 4213068 to open debug window.
(3) Enter
, then enter to window menu M-A(M-$), the flow meter will display’
Temperature Calibration at 50
"’ and T1,T2 current original temperature value.
(4) After PT100 is fully stable by estimating(about 2 minutes),enter
. Then enter to
continue into M06 for displaying temperature value.
(5) Immerge the two pieces of PT100 resistors into84.5±0.05! thermostat
(6) Enter
, then enter to window menu M-A(M-$), then re-enter to window
menu M-B, the flow meter will display ’ Temperature Calibration at 84.5
"’ and T1,T2 current
original temperature value.
(7) After PT100 is fully stable by estimating (about 2 minutes), enter
. Then enter to
continue into M06 for displaying temperature value.
(8) Calibration finished, then check the calibration result.
If the flow meter displays similar meaning of wrong calibration temperature, please confirm,
on fourth step or seventh step, that means something wrong with calibration temperature or
temperature measurement circuit.
If under the condition without thermostats or on field spot, the ultrasonic flow meters also have a
zero setup function of 2-way PT100 resistors, and this function is used to correct the problem for
matching error between two PT100 resistors. Lower temperature zero setup for PT100 is in
window menu M-8,and higher temperature zero setup for PT100 is in window menu M-9.
While zero point setup, it is better to immerge two PT100 into enough water, and wait for PT100
fully and averagely heated. Then enter to
or to continue. Please
note the lower temperature value is not over 40!,and higher temperature value is at least 55!#"
Zero point setup for temperature initially solves the ‘zero point’ in PT100. The best way is still to
use thermostats for calibration.
5.5 4-20mA Output of Temperature Measurement
"Instantaneous heater rate can be output by 4-20mA
Firstly, select’8.4-20mA corresponding heat flow rate’ in window menu M55. Then select 4mA
corresponding heater value in M56, and 20mA corresponding heater value in M57.
An application case:
Instantaneous heater rate range is 0-1000GJ/h, the flow meter is connected to a DCS system by
4-20mA output. And request instantaneous heater rate=0,current output value=4mA, and while
1000GJ/h, current output value=20mA. The detailed steps are as below:
A. Enter M55,then enter
,use to select 8.4-20mA corresponding heat flow rate