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A70H A

 

 

 

 

 

 

 

 

 

 

 

 

The Comptus A70H-A PAR sensor utilizes a silicon-photo detector for measuring solar radiation in the 400-700nm wavelength. When there is sunlight, a voltage output is generated proportional to the angle of incidence.

 

 Item

Technical Specification

Spectral Range

400-700nm

Supply 

5VDC, 12-24VDC

Accuracy 

 +/-5% rdg

Range 

0-2500 µmol*m-2s S-1, 0-2000W/m2

Output

0-2000mV

4-20mA (2wire)

RS485

Sensitivity

0-2500 µmol*m-2 S-1

.8mV/µmol*m-2 S-1

6.4µA/µmol*m-2 S-1

 

0-2000W/m2

1mV/W/m2

8µA/W/m2

 

Response Time

 <1s (99%) 

Temperature effect

 <0.05%/  ̊C 

Cosine correction

 <10% (until 80  ̊) 

Non-linearity

  <+/- 2% 

Operating Temperature

  -40 - +80  ̊C 

Shell Material

 Aluminum Alloy 

Storage Condition

 10  ̊C - 10  ̊C @ 20% - 90% RH 

 

Dimensions:
Base Thickness: 3.5mm
Sensor Height: 30mm
Total Height: 33.5mm
Base Diameter: 64mm
Sensor Diameter: 32mm
Mounting Holes: 4.5mm
Conductor cable: 1m

 

Electrical Connections

Cable

Voltage/Current

Current (2 wire)

RS485

Red

V+

 

V+

Yellow

Signal

V+

RS485A

Black/Green

V-

 

V-

Blue

 

V-

RS485B

 

Calculation Method

  • 0-2000mV

Range: 0-2000W/m2 PAR values(W/m2)=Voltage output value (mV)*1 (Sensitivity)

Range: 0-2500µmol*m-2*S-1 PAR values (µmol*m-2*S-10)= Voltage output value (mV)/0.8 (sensitivity)

  • 4-20mA

Range: 0-2000W/m2 PAR values (W/m2)=(I(µ-4000µA/6.4)); where I is output current value, unit: µA

  • RS483

Modbus-RTU

Communication Protocol (MODBUS)

Transmission Mode: MODBUS-RTU, Baud rate: 9600bps, Data bits: 8, Stop bit: 1, Check bit: no
Slave address:  the factory default is 09H (set according to the need, 00H to FFH)

  • The 04H function code Example: Read the radiation value

Host Scan Order (slave address: 0x09)
09 04 00 01 00 01 6142
Slave Response
09 04 02 01 28 597F
Range: A  Radiation value: (0128)H=(296)D=296(µmol*m-2* S-1)
Range: B  Radiation value: (0128H)=(296)D+296(W/m2)

  • The 06H Funtion Code Example: Modify the slave address

Host Scan Order (Changed from 9H to01H):
09 06 00 42 00 01 E956
Slave Response
09 06 00 42 00 01 E956

If you forget the original address, you should use the broadcast address(00H) (ensure no other devices are on the bus at this time).

Note:

  1. All underlined text is fixed bit;
  2. The last two bytes are CRC check command;
  3. If you change the address, restart the device to take effect.

 

 

 

 

 

 

 

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