iGrow 1800 Installation Guide
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Link4 (714) 524-0004
Input and Sensor Installation
The iGrow 1800
utilizes a variety of different sensors. In this section you will be shown how to install
indoor/outdoor temperature and humidity, light, wind direction and speed, rain and CO
2
sensors and a
Sensaphone.
Indoor Air Temperature and Humidity Sensor
The iGrow 1800
ships with a temperature/humidity sensor in a radiation shield to ensure accurate air
temperature readings in direct sunlight. The sensor includes a 50-foot sensor cable. Normally you will
want to hang the sensor near the crop level close to the center of the controlled environment. It is
important to keep the sensor away from irrigation emitters, unit heaters, etc. that will effect the accuracy
of the sensor.
1. First, open up the front panel to the 90 deg. position, as shown in Figure 4.5. Make sure the cable
supports the front panel securely.
2. Find a central location in the greenhouse and let it hang relatively close to the height of where the
plants will be.
3. Run the free end of the sensor cable to the controller unit.
4. You may extend the sensor cable as needed, but make sure to use an adapter and wire approved by
Link4 to make any extensions (the wire and adapter can be purchased from Link4). Any extension
wire must be shielded and stranded 24AWG type wire.
5. Carefully insert the cable through the right most watertight fitting at the bottom of the enclosure. It is
easy to strip insulation and/or break wires when pulling cable. If you want to bundle wires tighter, use
UV protected “tie wraps” (typically blue or black), and do not over-tighten.
Note:
If any splices are needed to extend cable length, make certain they are WATERTIGHT. Water or
fertilizer infiltration WILL cause unstable sensor readings.
6. Connect the wires as shown in Figure 4.13.
7. Keep sensor cables away from interference sources, including high voltage power wiring, inverters,
motor controllers, mercury arc, or sodium lamp circuits. Placing sensor cable near such wiring may
cause erratic sensor readings.
8. After installing the sensor, it is recommended that sensors be checked by plugging in the power
supply and testing under various conditions before moving on in order to make sure the sensor works
properly and accurately. Test the temperature by changing the indoor temperature to see if it is
reading properly. After testing remember to unplug the unit to continue installing other sensors.
