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Installing the Apollo GEM
Temperature Sensor
The Apollo GEM temperature sensor comprises a 3M cable with a 3mm diameter metal
temperature probe at one end and a 4 pin modular jack connector at the other.
If a temperature sensor is used the sensor cable will need to be routed back from the cylinder
to the Apollo GEM controller. 5M and 10M temperature sensor extender cables are available
from Apollo Solar Electric.
If the cylinder has a temperature sensor pocket the Apollo GEM probe should be inserted into
the pocket as far as it will go.
If the cylinder is a foam insulated type the probe can be inserted directly into the insulation,
about half to 2 thirds the way up the cylinder and at an angle of about 30
o
from vertical.
Push the probe right into the foam insulation until the tip of the probe comes into contact with
the metal cylinder (see diagram).
For non-insulated cylinders with a fibreglass jacket, attach the probe directly to the side of the
cylinder inside the jacket using an elastic cord or similar. Alternatively the probe can be bonded
to the side of the cylinder using an epoxy adhesive.
Plug the other end on the temperature sensor cable into the “TEMP SENS” connector on the right
hand side of the Apollo GEM circuit board.
Apollo GEM
Installation Manual
Side view of foam insulated cylinder (section)
Foam Insulation
Temperature sensor.
Push into foam