Grain dryer GSM alarm2 also works with old grain dryer.
These dryers there is no automation, and no extra alarm relay
Do not worry, placed in a 230V alarm lamps over Detectors, which is due to the signals GSM alarm device.
Likewise, you can put a temperature sensor drying air outlet and get alarm if you need.
The device has a metal housing and sealed. It can be considered a very dusty conditions. It has a separate GSM antenna.
Dimensions: 230 * 100 * 50mm. Weight 1.4 kg
You can put eight alarm receiver, you can change causes alarm, you can get GSM / SMS message when the dryer in the bulb lights up.
You can calibrate the temperature sensor and set the minimum and maxi thermal status alarms
2 m cabels for alam lamp (6 pcs) and temperature sensors (2 pcs)