| ADVANTAGES
The Black Bulb Thermostat is based on the principle of the globe
thermometer - the most accurate and practical measurable indicator
of proper growing temperature.
Because of its high sensitivity and its ability to respond to radiation, air temperature, and air velocity the Black Bulb Thermostat constantly adjusts heating systems to the instantaneous thermal needs of plants.
By ensuring that temperature overshoot or overheating never occurs, substantial energy economies are achieved and condensation is
minimized.
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HOW IT WORKS
The Black Bulb’s Globe is a hemisphere of high thermal conductivity material with a blackened surface. Inside the hemisphere is a highly sensitive temperature sensing element. The rear of the hemisphere is well insulated against conductivity from the cabinet and mounting surface. The Black Bulb sensor is installed within the heated greenhouse at bench level. The signal from the sensor is fed back to an electronic control unit via a three core cable which can be up to 656 feet long. The control unit can be located in the greenhouse or nearby office or other building, protected from unauthorized adjustment.
The control unit has separate knobs for separate day and night
temperatures. The operating periods for the day and night temperatures are controlled externally by time switches or manual switches (not supplied).
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SPECIFICATIONS
Range of adjustment
Calibration Accuracy
Sensitivity
Power Supply
Power Consumption
Supply Voltage Variation
Switching Contacts:
|
30-86º F
1% of scale range
better than 1º F
110v - 50/60Hz
5VA
+10% - 15%
|
| |
Mode
Maximum Voltage
Maximum Current AC |
Single Pole
110v AC
16A resistive
8A inductive
|
The left hand knob adjusts the day termperature within the range 30 to 86º F (linear scale)
The right hand knob adjusts the night temperature within the range -10 to 60º F (linear scale)
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