Sensors
Temperature
Recommended Sensor : Resistance Temperature Detector (RTD) located in an Aspirated Box.
Listing of system components and their manufacturers.
Note: References to company and brand names are used for
identification purposes only and do not necessarily constitute
endorsements over similar products made by other companies.
| Dissolved Oxygen Sensor | |
| Model: | Orion 820, hand held, battery operated |
| Manufacturer: | Orion Research, Inc., Boston , MA |
| Specifications: | Output: 10 mV per mg/l Response time: 99% of final value in less than 40 sec at 200C Min. sample flow: 15 cm/sec Temp. range: 0 - 50oC Membrane: Teflon. FEP, thickness: 12.5 microm |
| Compact Submersible Centrifugal Pump
|
|||||||||||||||
| Model: | 1P808A | ||||||||||||||
| Manufacturer: | Teel | ||||||||||||||
| Distributor: | Dayton Electric Mfg. Co., Chicago, IL | ||||||||||||||
| Specifications: | 0.02 HP, 75 W, max 1.5 Amps flow rate versus pressure head:
|
||||||||||||||
| Solenoid Valve | |
| Model: | U8225A3V: Brass solenoid valve (normally closed) |
| Manufacturer: | Automatic Switch Co., Florham Park, NJ |
| Temperature Sensor (for temperature of nutrient solution) | |
| Model: | PR-11-2-100-(1/4)-6-E |
| Manufacturer: | OMEGA Engineering, Inc., Stamford, CT |
| Specifications: | 100 Ohm resistance temperature probe with 2 lead wires |
Relative Humidity
Recommended Sensor : Accuracy and stability of
the sensor are important for reliable performance in the relatively
harsh greenhouse environment.
Carbon Dioxide Concentration
Recommended Sensor : Infra Red Carbon Dioxide Sensor
Light
Recommended Sensor : Quantum Sensor measuring Photosynthetically Active Radiation (PAR, 400-700 nm wave band). Foot candle sensors and lux meters are inappropriate, because they are used to quantify the sensitivity of the human eye and do not necessaily measure light used for photosynthesis.
Dissolved Oxygen (DO)
Recommended Sensor : Reliability and easy maintenance are important for this delicate sensor.
pH
Recommended Sensor : Reliability and easy maintenance are important for this delicate sensor.
Electrical Conductivity (EC)
Recommended Sensor : Reliability and easy maintenance are important for this delicate sensor. This sensor is sometimes combined with a pH sensor in one unit.
