Download KTA-304 Solar Radiation Sensor Transducer 4

KTA-304 Solar Radiation Sensor Transducer 4-20mA
•
•
•
•
•
•
Loop Powered
4-20mA output
Screw Terminal Connections
40V Maximum Loop Voltage
DIN Rail Mounting
Comes with Davis 6450 Solar Radiation Sensor
The KTA-304 is a 4-20mA loop powered current transmitter with DIN Rail mount designed to convert the Davis
6450 Solar radiation sensor signal to 4-20mA. The user is able to calibrate offset and gain of the output.
Connections:
Terminal Description
Loop +
More positive connection to the current loop
Loop -
More negative connection to the current loop
RJ
Solar radiation sensor input
Connecting KTA-304 to a panel meter, PLC or multimeter
Power
Supply
+ KTA-304
-
+
-
4-20mA
+ Input on
- PLC
Power Supply Considerations:
The minimum power supply voltage for the current loop depends on the burden voltage of each of the items in the
loop. The KTA-304 has a burden voltage of 8.5V on the current loop.
To determine the maximum load that the device can drive with the available power supply use the following
formula.
Max Load (ohm)=
Vpowersupply −Vburden
0.02
To determine the minimum power supply voltage for a given load use the following formula.
Vpowersupply=[ Load (ohm)×0.02]+Vburden
Current Calibration:
WARNING: The KTA-304 has already been calibrated. Make sure that you are using appropriate equipments to
measure current if you want to recalibrate the KTA-304.
The 4mA and 20mA points can be calibrated using the two trimpots on the circuit board.
VR1 adjusts the 4mA point, this should be adjusted first.
15 Jul 2015
www.oceancontrols.com.au
1 of 2
KTA-304 Solar Radiation Sensor Transducer 4-20mA
VR2 adjusts the 20mA point and should be adjusted after the 4mA point is set.
The method for calibration is as follows.
1. Set the main potentiometer to the 4mA point
2. Adjust VR1 until 4mA passes through the loop
3. Set the main potentiometer to the 20mA point
4. Adjust VR2 until 20mA passes through the loop
Output
The response of the Davis 6450 Solar radiation sensor is in W/m2.
–
–
15 Jul 2015
Sensor Range: 0 to 1800 W/m2
Current output range: 4 to 20mA (8.89uA per W/m2)
www.oceancontrols.com.au
2 of 2