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A 70-A PAR Sensor

Model A70-A PAR Sensor with Transmitter

Quantum Sensor with Track Mounted Transmitter


During photosynthesis plants use energy in the region of the electromagnetic spectrum from 400 -700 nm. The radiation in this range is referred to as Photosynthetically Active Radiation (PAR). Accurate measurement with the Comptus A70-A PAR sensor is obtained under all natural and artificial light conditions. The signal from the sensor is scaled by the signal conditioner to provide the desired output.

The A70 Series provides an analog signal output proportional to the phenomenon being monitored at an economical cost. All components have proven themselves rugged and reliable throughout many years of field operation.

These units are used in conjunction with electronic data collection systems or for input to control systems. They are readily combined with meter relays to provide custom controls.

All systems are available with outputs of 0-1 mA, 0-1 V or 4-20 mA. All systems may be powered from either 24 VAC, 120 VAC, 230 VAC or 12-24 VDC. The instruments are available in a variety of packages including steel JIC boxes meeting NEMA 12 standards, weatherproof fiberglass enclosures meeting NEMA 4X, IP66 and IEC 529 standards and track mounted versions. NEMA 12 enclosures provide protection from dust for indoor applications. NEMA 4X enclosures may be used indoors or outdoors. They provide protection from corrosion, wind blown dust and rain and are undamaged by ice. Track mounted versions are intended for mounting inside an enclosure provided by the user. Where required, electrical connection to the sensor is via terminal block. A barrier strip is provided for connection to operating power.


Model A70-A 


Range 0 - 10,000 umol s-1m-2  


Accuracy  + 3% Typical, + 5% Worst Case  
Size  Track Mount   1.75” W X 5.0”L X 1” H
   NEMA 12 6”W X 8”H X 4” D
   NEMA 4X 6”W X 8”H X 4” D
Weight  Track Mount 1 lbs
   NEMA 12 6 lbs
   NEMA 4XFG 4 lbs
   NEMA 4XSS 6 lbs
Operating Temperature  Electronics: 0 - 60 °C Sensor: -40 - 60 °C
Connectors  Barrier strips to accept AWG #12 or smaller wire  
Options  Expanded Ranges  
   High Performance Sensors  
Accessories  A96 Lightning Protectors  
  A76-I Mount  
  A70-LPDD Digital Display  
  Data Chart - Electronic Chart Recorder  


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