EES-401 Series Ultrasonic Energy Meter
Revision: 3.0.1
Page 84 of 90
The two PT1000 temperature sensors are installed on the inlet and return pipes and they will input temperature
signals to the EES-401 transmitter.
14.3
Energy Measurement Methods
Energy Measurement Methods:
Formula: Q = m ( h
1
- h
2
)
Q
—
Energy Value
m
—
quality of the medium( density
×
transit time water volume)
h1
—
enthalpy value of the inlet water
h2
—
enthalpy value of the return water
The temperature and pressure at the inlet and return water points can be measured by temperature sensors and a
transmitter, and pressure sensors and a transmitter. Then the enthalpy value at the inlet and return water points can
be calculated through the enthalpy values table. The flow of the medium can be measured via the ultrasonic flow
sensors and EES-401 transmitter, and the caloric value can be derived according to the above formulas and the
caloric calibration index.
14.4
Temperature Calibration Methods
Method: Resistance box calibration method
Note: The purpose is to calibrate the internal circuit of RTD module
Tools needed: one DC resistance box, 3 wires ( each wire less than 40mm length ), and an instrument screwdriver.
1.
Connect RTD module A1 to one end of the DC resistance box, and B1 to the other end of the DC resistance
box, and then connect A2 to one end of the DC resistance box, and B2 to the other end of the DC resistance
box.
2.
Power the transmitter on and then enter menu M07.
3.
Set resistance value of the DC resistance box to be 1000.00
Ω
.
4.
Clockwise or counterclockwise adjust the 4mA potentiometer on the left of A1 and the 4mA potentiometer
on the right of A2, and make sure the display of inlet water temperature and return water temperature is 0.00
±
0.1.
5.
Press
keys, input code "115800", then press
key to stretch. Only in
the current powering -on period, automatically shut down when the power is cut off.
6.
Press
key to enter and then select "Adjust 0"to return water temperature adjustment, press
to adjust temperature for 0.00, Press
key to enter and then select "Adjust 0"to inlet water
temperature adjustment, press
to adjust temperature for 0.00, Press
key to Complete
calibration.
7.
Set the resistance value of two DC Resistance boxes to be 1385.06
Ω
.
8.
Enter the menu M07, after waiting for two temperature stability press
keys
to enter and select "Adjust 100"to return water temperature adjustment, press
to adjust
temperature for 100. Press
key to enter inlet water temperature 100
℃
adjustment, press
to adjust temperature for 100, press
key to Complete calibration.
9.
Power on for many times, 0
℃
: inlet and return water temperature is 0.00
±
0.05, Temperature difference is
0.00
±
0.05. 100
℃
: inlet and return water temperature is 100
±
0.05, Temperature difference is 0.00
±
0.05.